User Manual User Manual

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Dual Measurement Multimeter

GDM-8261

USER MANUAL

GW INSTEK PART NO. 82DM-82610EB1

ISO-9001 CERTIFIED MANUFACTURER

Summary of content (224 pages)

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Dual Measurement Multimeter GDM-8261 USER MANUAL GW INSTEK PART NO.
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This manual contains proprietary information, which is protected by copyrights. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company. The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the right to change specifications, equipment, and maintenance procedures at any time without notice. Good Will Instrument Co., Ltd. No.
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Table of Contents Table of Contents SAFETY INSTRUCTIONS .................................................... 6 Safety Symbols .................................................... 6 Safety Guidelines ................................................ 7 GETTING STARTED .......................................................... 10 GDM-8261 Characteristics ................................ 11 Front Panel Overview ........................................ 12 Rear Panel Overview ....................................
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GDM-8261 User Manual View Serial Number ........................................... 75 Trigger Setting ................................................... 76 Digital Filter Setting .......................................... 79 Display Setting .................................................. 81 Measurement Configuration Settings ............... 82 ADC Setting ....................................................... 87 Frequency / Period Settings .............................. 91 Identification Settings ...
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Table of Contents INDEX ............................................................................
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GDM-8261 User Manual SAFETY INSTRUCTIONS This chapter contains important safety instructions that you must follow when operating the GDM-8261 and when keeping it in storage. Read the following before any operation to insure your safety and to keep the GDM-8261 in the best possible condition. Safety Symbols These safety symbols may appear in this manual or on the GDM-8261. Warning: Identifies conditions or practices that could WARNING result in injury or loss of life.
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SAFETY INSTRUCTIONS Safety Guidelines General Guideline CAUTION          Make sure that the voltage input level does not exceed DC1000V/AC750V. Make sure the current input level does not exceed 10A. Do not place any heavy object on the GDM-8261. Avoid severe impact or rough handling that can lead to damaging the GDM-8261. Do not discharge static electricity to the GDM-8261. Use only mating connectors, not bare wires, for the terminals. Do not block or obstruct the cooling fan vent opening.
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GDM-8261 User Manual Fuse  WARNING     Cleaning the GDM-8261    Operation Environment    Fuse type: 0.315AT 100/120VAC 0.125AT 220/240 VAC Make sure the correct type of fuse is installed before power up. To avoid risk of fire, replace the fuse only with the specified type and rating. Disconnect the power cord before fuse replacement. Make sure the cause of a fuse blowout is fixed before fuse replacement. Disconnect the power cord before cleaning.
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SAFETY INSTRUCTIONS Power cord for the United Kingdom When using the GDM-8261 in the United Kingdom, make sure the power cord meets the following safety instructions.
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GDM-8261 User Manual GETTING STARTED This chapter describes the GDM-8261 in a nutshell, including an Overview of its main features and front / rear panel introduction. After going through the Overview, follow the Power-up sequence to properly setup the GDM-8261. Please note the information in this manual was correct at the time of printing. However as GW Instek continues to improve its products, changes can occur at any time without notice.
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GETTING STARTED GDM-8261 Characteristics The GDM-8261 is a portable, dual-display digital multimeter suitable for a wide range of applications, such as production testing, research, and field verification. Performance     Features     Interface       Optional Items    High DCV accuracy: 0.
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GDM-8261 User Manual Front Panel Overview Main Display Measurement Keys GDM-8261 61 AC DC 2W 4W AUTO F M S HOLD REL MIN MAX 2 Digit Dual Measurement Multimeter RMT C F S W M k W Hz C F S W m m V A M k W Hz m m V A AC DC 2W 4W AUTOMATHLIMIT ERR SHIFT EXT dBm % dB m Sense Hi Terminal Sense Lo, DC/AC 1A Terminal 2ND COMP STO RCL FILTSWEEP CC CV OUT REAR W 4W SENSE Input Hi Terminal INPUT V W HI MAX MAX 1.
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GETTING STARTED W 4W SENSE Sense HI Terminal Input Lo Terminal MAX 500V COM Input Hi Terminal Accepts HI sense line in 4W resistance measurement. For details, see page 33. Accepts ground (COM) line in all measurements except the sense line in 4W Resistance (page 33). The maximum withstand voltage between this terminal and earth is 500Vpk. Used as an input port for all measurements except for DC/AC Current measurements.
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GDM-8261 User Manual SHIFT → ACV (SCAN) SHIFT / EXIT Starts the optional scan measurement (page 110). SCAN ACV DCV SHIFT → DCV (STEP) DCV SHIFT / EXIT Measures DC Voltage (page 27). Starts the step measurement (page 110) using the optional scanner. STEP DCV ACI SHIFT → ACI (RECALL) ACI SHIFT / EXIT RECALL ACI DCI SHIFT → DCI (STORE) DCI SHIFT / EXIT Measures AC Current (page 32).
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GETTING STARTED SHIFT → (dBm) / Measures dBm (page 58). SHIFT / EXIT dBm / Hz/P (Frequency/ Period) SHIFT + Hz/P (dB) Measures Frequency or Period (page 41). Hz/P Measures dB (page 59). SHIFT / EXIT dB Hz/P TEMP (Temperature) SHIFT + TEMP (SENSOR) Measures Temperature (page 43). TEMP SHIFT / EXIT SENSOR TEMP Selects the type of thermocouple used in the Temperature measurement (page 44).
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GDM-8261 User Manual Measurement Keys (lower row) AUTO/ENTER As the AUTO key, selects the measurement range automatically. AUTO ENTER As the Enter key, confirms the entered value. SHIFT → AUTO (RATE) Selects the measurement update rate: Slow, Medium, or Fast (page 25). SHIFT / EXIT RATE AUTO ENTER Up/Down RANGE HOLD SHIFT → HOLD (COMPare) Selects the parameter in various occasions: higher ( ) or lower ( ). Activates the Hold function (page 64). HOLD Activates the Compare measurement (page 65).
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GETTING STARTED SHIFT → REL (RELative base) SHIFT / EXIT REL# Manually sets the reference value for the Relative value measurement (page 62). REL MX/MN (MAX/ MIN) SHIFT → MX/MN (FILTER) MX/MN SHIFT / EXIT Measures the Maximum or the Minimum value (page 61). Selects the digital filter type for the signal sampling (page 79). FILTER MX/MN 2nd (Display) / LOCAL 2ND LOCAL As the 2nd key, selects the measurement item on the 2nd display (page 49).
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GDM-8261 User Manual Rear Panel Overview Digital I/O Port Optional Scanner Port Power Cord Socket 16 CHANNEL SCANNER MAX. RATING 250V , 2A DIGITAL I / O RS232 CAL KEY LINE RATING 50 , 60 , 400Hz 25VA MAX. FUSE LINE 100VAC 0.315AT 120VAC 220VAC 0.125AT 240VAC DISCONNECT POWER CORD AND TEST LEADS BEFORE REPLACING FUSE SER.NO. LABEL Optional Communication port CAL Key Port USB Device Port RS-232C Port Fuse 0.315AT/ 0.125AT Accepts the power cord.
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GETTING STARTED Accepts a USB device cable for remote control; Type A, female connector. USB device port For remote control details, see page 129. CAL key port Digital I/O port CAL KEY DIGITAL I / O Reserved for internal purposes such as firmware updates and calibration. Accepts a digital I/O cable for the Hi/Lo limit tests; DB-9 pin, female connector. For digital I/O details, see page 121. Optional slot x1 Accepts the optional 16 channel scanner module. For scanner details, see page 101. MAX.
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GDM-8261 User Manual Set Up Tilt Stand Tilt stand steps Pull out the handle sideways and rotate it. Place the unit horizontally, Or in the tilt stand position. Place the handle vertically for hand carry.
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GETTING STARTED 220 120 240 100 240 220 100 240 1. Ensure the correct line voltage is lined up with the arrow on the fuse 220 the holder. If not, see page 208 to set line voltage and fuse. 120 Steps 120 Power Up 100 2. Connect the power cord to the AC Voltage input. Note Make sure the ground connector on the power cord is connected to a safety ground. This will affect the measurement accuracy. 3. Push to turn on the main power switch on the front panel.         4.
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GDM-8261 User Manual 7. Then the default setting appears.
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BASIC MEASUREMENT BASIC MEASUREMENT ACV Overview DCV ACI DCI 2/4W / Hz/P TEMP Basic Measurement Overview ................................ 25 Refresh Rate ........................................................... 25 Reading Indicator ................................................... 26 Manual/Automatic Triggering ................................ 27 Voltage AC/DC Voltage Measurement ................................. 27 Select Voltage Range ..............................................
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GDM-8261 User Manual Temperature Temperature Measurement .................................... 43 Select Thermocouple Type ..................................... 44 Set Reference Junction Temperature (T-CUP) ........ 45 Select Temperature Sensor Type ............................ 46 Set User RTD .........................................................
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BASIC MEASUREMENT Basic Measurement Overview Background Basic measurement refers to the eight types of measurements assigned to the upper row keys on the front panel.
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GDM-8261 User Manual Refresh Rate Function (Readings/s) S M F Continuity / Diode 100 200 300 DCV/DCI/100Ω~ 5 100MΩ (Accurate) 60 240 DCV/DCI/100Ω~ 100MΩ (Quick) 30 600 2400 ACV/ACI 1.2 3.38 30 10 100 (sec/reading) Frequency / Period 1 Selection steps 1. Press the Shift key followed by the AUTO (RATE) key. The refresh rate switches to the next. SHIFT / EXIT 2. The refresh rate indicator shows the current status.
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BASIC MEASUREMENT Manual/Automatic Triggering Automatic triggering (default) The GDM-8261 triggers according to the refresh rate. See the previous page for refresh rate setting details. Manual triggering Press the Trig key to trigger measurement manually. The trigger must be set to external (EXT) for manual triggering. See page 76. TRIG AC/DC Voltage Measurement Voltage type AC 0 ~ 750V DC 0 ~ 1000V 1. Activate ACV/ Press the ACV (AC Voltage) key or DCV DCV (DC Voltage) key. 2.
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GDM-8261 User Manual Select Voltage Range Auto range To turn the automatic range selection On/Off, press the AUTO key. Manual range Press the Up or the Down key to select the range. The AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range. Selection list Range Resolution Full scale @ slow rate 100mV 0.1µV 119.9999mV 1V 1µV 1.199999V 10V 10µV 11.99999V 100V 100µV 119.9999V 750V (AC) 1mV 750.000V 1000V (DC) 1mV 1000.
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BASIC MEASUREMENT The DC voltage range should be manually selected when any of the following conditions are true: 1. When DCV measurement is used. 2. When the signals being measured contain both DC and AC components. 3. When the amplitude of the AC component in the measured signal is higher or lower than the dynamic range of the range being currently selected by auto-range function.
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GDM-8261 User Manual Voltage Conversion Table This table shows the relationship between AC and DC reading in various waveforms. Waveform Sine Peak to Peak AC (True RMS) DC 2.828 1.000 0.000 1.414 0.435 0.900 2.000 0.771 0.636 2.000 1.000 0.000 1.414 0.707 0.707 2.000 2K 2D K= ( D  D 2 ) D=X/Y D=X/Y 1.000 0.
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BASIC MEASUREMENT Crest Factor Table Background Waveform Square wave Crest factor is the ratio of the peak signal amplitude to the RMS value of the signal. It determines the accuracy of AC measurement. If the crest factor is less than 3.0, voltage measurement will not result in error due to dynamic range limitations at full scale. If the crest factor is more than 3.0, it usually indicates an abnormal waveform as seen from the below table. Shape Crest factor 1.0 Sine wave 1.414 Triangle sawtooth 1.
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GDM-8261 User Manual AC/DC Current Measurement Background The GDM-8261 has two input ports for current measurement. A LO port for current less than 1.2A and a 10A port for measurements up to 10A. The GDM-8261 also features a ―Current Input Port Auto-Detect‖ feature (default, off). For details, see page 86. Current type 1. Activate ACI/ DCI 2. ACI/DCI mode display appears AC 0 ~ 10A DC 0 ~ 10A Press the ACI (AC Current) key or the DCI (DC Current) key. AC AUTO ACI or DCI S A 3.
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BASIC MEASUREMENT Select Current Range Auto range To turn the automatic range selection On/Off, press the AUTO key. Manual range Press the Up or the Down key to select the range. AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range. Selection list Range Resolution 100µA(DC only) 0.1nA DC Current Range Note: AUTO Full scale @ slow rate 119.9999µA 1mA 1nA 1.199999mA 10mA 10nA 11.99999mA 100mA 0.1µA 119.9999mA 1A 1µA 1.
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GDM-8261 User Manual The DC current range should be manually selected when the following conditions are true: 1. When DCI measurement is used. 2. When the signals being measured contain both DC and AC components. 3. When the amplitude of the AC component in the measured signal is higher or lower than the dynamic range of the range being currently selected by auto-range function.
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BASIC MEASUREMENT 2. 2W/4W resistance mode display appears 2W AUTO S k W 2W or 4W + Ω Indicates 2W or 4W Resistance mode 3. Connect the test lead and measure AUTO Indicates Automatic range selection 1K 2nd display shows the Resistance range Connect the test lead. For 2-wire resistance, use the Ω (V) and the COM port. For 4-wire resistance, use the Ω (V) and the COM port, plus the 4W sense, and LO port for sensing. The display updates the reading.
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GDM-8261 User Manual Note 36 10MΩ 10Ω 11.99999MΩ 100MΩ 100Ω 119.9999MΩ For more detailed range, see the specifications at page 212.
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BASIC MEASUREMENT Diode Test Background Diode test checks the forward bias characteristics of a diode by running a constant forward bias current, approx. 1mA, through the DUT. 1. Activate diode Press the test / key once. / S 2. Diode mode display appears V / +V DIODE 3. Connect the test lead and measure Indicates Diode test 2nd display shows the title Connect the test lead between the / and COM port; Anode-V, Cathode-COM. The display updates the reading.
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GDM-8261 User Manual Continuity Test Background Continuity test checks that the resistance in the DUT is low enough to be considered continuous (of conductive nature). 1. Activate continuity test Press the key twice. / S 2. Continuity mode display appears W / +Ω CONT 3. Connect the test lead and measure / Indicates Continuity test 2nd display shows the title Connect the test lead between the Ω and the COM port. The display updates the reading.
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BASIC MEASUREMENT Set Continuity Threshold Background Continuity threshold defines the maximum resistance allowed in the DUT when testing the continuity. Threshold Range 0 ~ 1000Ω, 1Ω resolution, 10Ω default 1. 1. Activate threshold setting Press the Shift key, the 2nd key, the Right key. The measurement menu appears. 2. Press the Down key, the Right key, the Enter key. The continuity threshold setting appears. SHIFT / EXIT MENU 2ND TRIG TRIG AUTO ENTER W 2. Edit threshold 1.
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GDM-8261 User Manual Select Beeper Setting Background Beeper setting defines how the GDM-8261 notifies the continuity test result to the user. When the Beeper setting is off it will also turn the keypad sound off. Beeper parameter Pass Beeps when the test result is pass Fail Beeps when the test result is fail Off Beep function is turned Off 1. Activate beeper setting menu 1. Press the Shift key followed by the 2nd (Menu) key. The system menu appears. SHIFT / EXIT MENU 2ND 2.
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BASIC MEASUREMENT Frequency/Period Measurement To measure Frequency, press the 1. Activate frequency/period Hz/P key once. measurement To measure the Period, press the Hz/P Hz/P Hz/P Hz/P key twice. AUTO 2. Frequency (Period) mode display appears 3. Connect the test lead and measure S M Hz Hz (S) Indicates Frequency (period) measurement AUTO Indicates Automatic range selection FREQ (PERIOD) 2nd display shows the measurement mode Connect the test lead between the V and the COM port.
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GDM-8261 User Manual Select Frequency/Period Voltage Range Frequency/Period To select between period/frequency mode voltage range, press the 2nd key 2ND twice. Auto range To turn the automatic range selection On/Off, press the AUTO key. Manual range Press the Up or the Down key to select the range. AUTO indicator turns Off automatically. If the appropriate range is unknown, select the highest range. Range 42 AUTO Frequency 3Hz~300kHz Period 3.3µs ~333.
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BASIC MEASUREMENT Temperature Measurement Background The GDM-8261 can measure temperature using either thermocouples or RTD sensors. For thermocouples, the GDM-8261 accepts a thermocouple input and calculates the temperature from the voltage fluctuation. The thermocouple type and reference junction temperature are also considered. For RTD sensors, the GDM-8261 calculates voltage based on the resistance of the chosen RTD. 1. Activate temperature measurement For Celsius units, press the TEMP key once.
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GDM-8261 User Manual Range RTD: -200°C ~ +600°C (sensor dependent) Thermocouple: -210°C ~ +1820°C (sensor dependent) Select Thermocouple Type Background The GDM-8261accepts thermocouple inputs and calculates the temperature from the voltage difference of two dissimilar metals. Thermocouple type and reference junction temperature are also considered. Parameter Thermocouple Range E -200 to +1000°C 0.002 °C J -210 to +1200˚C 0.002 °C T -200 to +400°C K -200 to +1372˚C 0.
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BASIC MEASUREMENT 4. Select sensor type Press the Up/Down key. The thermocouple type switches to the next one.  5. Confirm and go back to the default display      Press the Enter key to confirm. Press the Exit key to go back to the default display.
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GDM-8261 User Manual 2. Edit reference Use the Left/Right key to move the temperature cursor, and use the Up/Down key to HOLD TRIG change the value. Default: 23.00 Press the Enter key to confirm the value, or the Exit key to cancel. The display goes back to the previous menu. AUTO ENTER (confirm) SHIFT / EXIT (cancel) Select Temperature Sensor Type Background The GDM-8261 supports a number of thermocouple types as well as 2 or 4 wire RTD.
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BASIC MEASUREMENT 3. Select sensor Press the Up and Down keys to highlight the RTD sensor type. RTD Type: 4. Confirm and go back to the default display PT 100, PT 3916, PT 385, F 100, D 100, USER Press the Enter key to confirm. Press the Exit key to go back to the default display. AUTO SHIFT / EXIT ENTER Set User RTD Background The USER setting allows any custom RTD sensor coefficients to be used.
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GDM-8261 User Manual Press the Down key twice. The RTD selection menu appears on the display. Use the Up/Down keys to select USER. 3. Open USER type menu Press Enter. The alpha coefficient menu appears on the display. 4. Edit coefficient Use the Left/Right key to move the values cursor, and use the Up/Down key to AUTO ENTER HOLD TRIG change the coefficient value. Default: 0.00385 Press the Enter key to confirm the value and move onto to the next coefficient. AUTO ENTER (confirm) Default: Alpha 0.
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DUAL MEASUREMENT DUAL MEASUREMENT Dual Measurement Background The dual measurement mode allows you to use the 2nd display to show another item, thus viewing two different measurement results at once. When the multimeter is used in dual measurement mode, both displays are updated from either a single measurement or from two separate measurements.
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GDM-8261 User Manual Amplifier Output INPUT VW AC Noise Vo Vo AMP DC offset V T COM DC Power Supply Output INPUT VW V V DC Power Supply AC ripple DC output T COM DCV DCI  Monitor the voltage and current present on a component in a circuit or the output voltage and current of a DC power supply. Monitor Voltage and Current INPUT VW Load V A LO COM 0~1.
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DUAL MEASUREMENT ACV Hz  Measure the frequency response of devices such as amplifiers or buffers*. * The frequencies of the amplifier output must be within the DMM’s measurable AC bandwidth for the amplitude at a spot frequency to be measured accurately. Frequency Response Vin INPUT VW Vin Vo f AMP Vo V f COM The following table shows the available measurement combinations.
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GDM-8261 User Manual 2nd Measurement item setting Press the 2nd key, then the target item (example: ACV). The display updates the measurement result.
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DUAL MEASUREMENT Connect the test When using the dual measurement function, the leads and connection method and number of test leads required measure depends on the measurement combination. Use the connect diagrams below as guide when taking dual measurements.
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GDM-8261 User Manual Voltage/Frequency/Period and Current Measurement W 4W SENSE INPUT VW HI Load LO COM 0~10A 0~1.2A Note: DC Current measurements will be displayed as a negative value as the polarity of the current leads has been reversed. Please take into account the resistance of the test leads and internal resistance of the current connection as it is in series with the test circuit.
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ADVANCED MEASUREMENT ADVANCED MEASUREMENT Overview dBm dB FILTER REL# / Hz/P MX/MN REL COMP HOLD INT/EXT TRIG MATH 2/4W Advanced Measurement Overview ......................... 56 Refresh Rate ........................................................... 56 Reading Indicator ................................................... 57 Common Attribute: Manual/Automatic Triggering . 57 dBm/dB dBm/dB/W Measurement ...................................... 58 Measure dBm/W ..................................
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GDM-8261 User Manual Advanced Measurement Overview Background Advanced Measurement Advanced measurement mainly refers to the type of measurement which uses the result obtained by one of the basic measurements: ACV, DCV, ACI, DCI, 2/4W, Diode/Continuity, Frequency/Period, and Temperature.
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ADVANCED MEASUREMENT Refresh Rate Function (Readings/s) S M F Continuity / Diode 100 200 300 DCV/DCI/100Ω~ 5 100MΩ (Accurate) 60 240 DCV/DCI/100Ω~ 100MΩ (Quick) 30 600 2400 ACV/ACI 1.2 3.38 30 10 100 (sec/reading) Frequency/Period Selection steps 1 1. Press the Shift key followed by the AUTO (RATE) key. The refresh rate switches to the next. SHIFT / EXIT 2. The refresh rate indicator shows the current status.
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GDM-8261 User Manual Manual triggering Press the Trig key to trigger the measurement manually. The trigger must be set to external (EXT) for manual triggering. See page 76. TRIG dBm/dB/W Measurement Applicable to Background Parameters ACV DCV Using the ACV or DCV measurement result, the GDM-8261 calculates the dB, dBm or W value based on a reference resistance value in the following way.
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ADVANCED MEASUREMENT Select reference resistance View result in Watts To change the reference resistance, press the Up/Down key. The new resistance appears in the 2nd display. The following is the resistance list. 2 4 8 16 50 75 93 110 124 125 135 150 250 300 500 600 800 900 1000 1200 8000 When the reference resistance is less than 50Ω, it is possible to calculate the watt value. If the reference resistance is greater than 50Ω then this step can be ignored.
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GDM-8261 User Manual dB result appears DC S m dB dB Indicates dB measurement -00.617mV Indicates the present Voltage reading dBmref Press the 2nd key to see the dBm ref value. Deactivate dB measurement To cancel the dB measurement, press the Shift key followed by the Hz/P key, or simply activate another measurement.
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ADVANCED MEASUREMENT Max/Min Measurement Applicable to ACV DCV ACI DCI 2/4W Hz/P TEMP Background Maximum and Minimum measurement stores the highest (maximum) or lowest (minimum) reading and shows it on the 1st display when the 2nd key is pressed. 1. Activate Max/Min For Max measurement, press the MX/MN key once. For Min measurement, press the MX/MN key twice. 2.
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GDM-8261 User Manual Relative Value Measurement Applicable to ACV DCV ACI DCI 2/4W Hz/P TEMP Background Relative measurement stores a value, typically the data at the moment, as the reference. The following measurement is shown as the delta between the reference. The reference value will be cleared upon exit. 1. Activate Relative measurement Press the REL key. The measurement reading at the moment becomes the reference value. 2.
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ADVANCED MEASUREMENT V REL Indicates Relative measurement 1st display Shows the reference value (to full scale) 2nd display Indicates Relative value modification 2. Use the Left/Right key to move the flashing point (cursor), and use the Up/Down key to change the value. 3. Press the Enter key to confirm the value, or the Exit key to cancel. The display switches to measurement.
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GDM-8261 User Manual Hold Measurement Applicable to ACV DCV ACI DCI 2/4W Hz/P TEMP Background The Hold Measurement function retains the current measurement data and updates it only when it exceeds the set threshold (as a percentage of the retained value). 1. Activate Hold measurement Press the Hold key. 2. Hold measurement display appears AC HOLD S HOLD V HOLD Indicates Hold measurement 2nd display Shows the Hold threshold 1st display Shows the measurement data. 3.
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ADVANCED MEASUREMENT Compare Measurement Applicable to ACV DCV ACI DCI 2/4W Hz/P TEMP Background Compare measurement checks and updates if the measurement data stays between the upper (high) and lower (low) limit specified. 1. Activate Compare measurement Press the Shift key, then the Hold (Comp) key. COMP SHIFT / EXIT HOLD 2. High limit setting V 1st display Shows the high limit value 2nd display Indicates high limit setting 1.
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GDM-8261 User Manual 3. Low limit setting V 1st display Shows the low limit value 2nd display Indicates low limit setting 1. Use the Left/Right key to move the cursor (flashing point) between high/low setting, digits, and decimal point. HOLD TRIG 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing. The compare measurement starts right away. 4.
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ADVANCED MEASUREMENT 5. Result High If the 2nd display shows High, the result is above the High limit. Digital I/O: FAIL Out (Pin 6) and HIGH Limit FAIL Out (Pin 7) are activated. Low If the 2nd display shows Low, the result is below the Low limit. Digital I/O: FAIL Out (Pin 6) and LOW Limit FAIL Out (Pin 8) are activated. Pass If the 2nd display shows Pass, the result is staying between the High and the Low limit. Digital I/O: PASS Out (Pin 5) is activated.
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GDM-8261 User Manual Math Measurement Applicable to ACV DCV ACI DCI 2/4W Hz/P TEMP Background Math measurement runs four types of mathematical operations, MX+B, 1/X, Percentage and Stats, based on the other measurement results. Math type MX+B Multiplies the reading (X) by the factor (M) and adds/subtracts offset (B). 1/X Inverse. Divides 1 by the reading (X). Percentage Runs the following equation.
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ADVANCED MEASUREMENT 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing and move to offset setting. 3. Set the offset (B) AUTO ENTER V 1st display Shows the offset (B) 2nd display Indicates MX+B (The letter B flashes) 1. Use the Left/Right key to move the cursor (flashing point) between the offset, digits and decimal point. HOLD TRIG 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm the editing. The MX+B measurement result appears.
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GDM-8261 User Manual Measure 1/X 1. Activate 1/X 2. View 1/X Press the Shift key, the 2/4W (Math) key, the Down key twice. The 1/X setting appears. Press the Enter key to view the 1/X measurement result. AC AUTO SHIFT / EXIT MATH 2/4W AUTO ENTER S V MATH 1st display Shows the 1/X value 2nd display Indicates 1/X MATH Indicates Math operation Measure Percentage 1. Activate Percentage Press the Shift key, the 2/4W (Math) key, the Up key twice. The Reference setting appears.
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ADVANCED MEASUREMENT 1. Use the Left/Right key to move the cursor (flashing point) between the digits and decimal point. HOLD TRIG 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing. 3.
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GDM-8261 User Manual 2. Set Count 2a.Continuous count Press the Enter key to set the number of measurements (counts) that will be used for the Stats function. The Count menu appears. AUTO ENTER 1st display Shows the count number as continuous 2nd display Indicates the count setting 1. To set the count to Continuous and to start measurement, press Enter when CONTINU is displayed on the 1st display. AUTO ENTER 2. Measurement starts automatically. 2b. User-defined 1.
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ADVANCED MEASUREMENT DC 3. View Data AUTO S MATH 1st display Shows the current count number/measurement 2nd display Indicates the count measurement mode. MATH Indicates Math operation Press the 2nd key to cycle through the different statistical data measurements.
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GDM-8261 User Manual SYSTEM/DISPLAY CONFIGURATION ACV Refresh Rate DCV ACI DCI RATE FILTER MENU AUTO MX/MN 2ND Refresh Rate Setting .............................................. 75 View Serial Number ............................................... 75 Trigger Manual/Automatic Triggering ................................ 76 Use External Trigger ............................................... 76 Set Trigger Delay .................................................... 78 Digital Filter Overview ..
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SYSTEM/DISPLAY CONFIGURATION Refresh Rate Setting Background Refresh rate defines how frequently the GDM-8261 captures and updates the measurement data. A faster refresh rate yields a lower accuracy and resolution. Slower refresh rates yield a higher accuracy and resolution. Consider this trade-off when selecting the refresh rate. The refresh rate settings are individually set for all measurement modes except for ACV/ACI measurements. ACV/ACI use the same refresh rate settings.
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GDM-8261 User Manual 2. Press the Down key. The serial number is shown on the display. 1st display Shows 2 characters (AA~ZZ). 2nd display Shows 6 numbers (000000~99999). 3. Press the Enter key or the Exit key to go back to the previous display. AUTO or SHIFT / EXIT ENTER Trigger Setting Manual/Automatic Triggering Automatic triggering (default) The GDM-8261 triggers according to the refresh rate. See the previous page for refresh rate setting details.
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SYSTEM/DISPLAY CONFIGURATION DB-9, female Digital I/O pin assignment High Limit FAIL Out FAIL Out LOW Limit FAIL Out EOM Out 67 8 9 1 2 34 5 VCC Out PASS Out NC External Trigger In Digital (chassis) Ground 1. Activate external trigger Press the Shift key followed by the Trig (Int/Ext) key. The EXT indicator appears on the display. SHIFT / EXIT INT/EXT TRIG EXT 2. Start trigger Press the Trig key to start triggering manually. The indicator turns On.
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GDM-8261 User Manual Set Trigger Delay Background Trigger delay defines the time delay between triggering and measurement start. The default is set at 10ms. Panel operation 1. Press the Shift key, the 2nd (Menu) key, the Right key, the Down key. The delay menu appears. MENU SHIFT / EXIT 2ND TRIG 2. Press the Down key. The delay setting appears. 3. Move the flashing point (cursor) using the Left/Right key. Change the value using the Up/Down key. 4.
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SYSTEM/DISPLAY CONFIGURATION Digital Filter Setting Overview Filter basics The GDM-8261’s internal digital filter converts the analog input signal into digital format before passing it to internal circuits for processing. The filter affects the amount of noise included in the measurement result. Filter type The digital filter averages a specific number of input signal samples to generate one reading. The filter type defines the averaging method.
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GDM-8261 User Manual Filter count Filter count defines the number of samples to be averaged per reading. More samples offer low noise but long delay. Less samples offer high noise but short delay. 2 ~ 100 Range Filter Setting Turn on Filter 1. Press the Shift key followed by the MX/MN (Filter) key. 1st display SHIFT / EXIT FILTER MX/MN Shows the filter count 2nd display Shows the filter type (flashing) 2. Select the filter type using the Up/Down key.   3.
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SYSTEM/DISPLAY CONFIGURATION Turn off Filter Press the Shift key followed by the MX/MN (Filter) key. The Filter indicator will disappear from the display. SHIFT / EXIT FILTER MX/MN Display Setting Display Light Setting Background The display light setting adjusts the brightness of the display reading. Use light 3 or more (brighter) when working indoor; use light 2 or 1 (darker) when working outdoor under the sun. Level Panel operation 5 (brightest) ~ 1 (darkest), default = 3 1.
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GDM-8261 User Manual 4. Select the level using the Up/Down key. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. AUTO SHIFT / EXIT ENTER Display On/Off Setting (+ key lock) Background The display can be turned off when not used for a long time. Note that when this function is used, the panel keys are also locked except for the Output On/Off key. The display is turned on by default.
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SYSTEM/DISPLAY CONFIGURATION 2. Press the down key, followed by the right key twice to enter the D-SHIFT menu. TRIG TRIG 3. Press the Down key. The D-Shift setting appears. 1st display Shows the D-Shift setting 4. Select the setting using the Up/Down keys. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. AUTO SHIFT / EXIT ENTER Input Resistance Setting Background The 0.
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GDM-8261 User Manual 2. Press the down key followed by the right key three times. The Input Resistance menu appears. TRIG TRIG TRIG 3. Press the Down key. The input resistance setting appears. 1st display Shows the input resistance setting 4. Select the setting using the Up/Down keys. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display.
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SYSTEM/DISPLAY CONFIGURATION Panel operation 1. Press the Shift key, the 2nd (Menu) key followed by the Right key. The MEAS menu appears. SHIFT / EXIT MENU 2ND TRIG 2. Press the down key followed by the left key twice. The AC Bandwidth menu appears. HOLD HOLD 3. Press the Down key. The input bandwidth setting appears. 1st display Shows the bandwidth setting 4. Select the setting using the Up/Down keys. 5. Press the Enter key to confirm your selection.
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GDM-8261 User Manual Current Input Port Auto-Detect Setting Background The Current Input Port Auto-Detect setting will allow the DMM to detect whether current is applied to the 1A or 10A input ports and enables it to set the correct range when Auto range is on. The Current detect feature works by activating the input port only when a certain Detect Threshold is reached and deactivating the input port when the input current dips below a certain Reset Threshold.
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SYSTEM/DISPLAY CONFIGURATION 3. Press the Down key. The input current detect setting appears. 1st display Shows the current detect setting 4. Select the setting using the Up/Down keys. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. AUTO SHIFT / EXIT ENTER ADC Setting Auto-Zeroing Background The Auto Zeroing (A-Zero) function can be used in resistance, TC, RTD, DCV and DCI measurements.
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GDM-8261 User Manual The diagram below shows how the total offset is obtained. Input Hi Terminal Mode A/D Driver offset ADC offset Buffer A/D Driver ADC Hi Lo Input Lo Terminal Applicable Measurement Mode, Rate and Speed settings Buffer offset Rate DCV, S DCI, M 4W/2W F Accuracy Speed Total offset Quick Speed     TC, RTD  (No Speed setting) Panel operation 1. Press the Shift key followed by the 2nd (Menu) key. Press the right key twice. The ADC setting menu appears.
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SYSTEM/DISPLAY CONFIGURATION Auto-Gain Background The Auto-Gain (A-GAIN) setting performs auto gain correction of the internal amplifiers. Off, On (default=On) Setting Applicable Measurement Mode, Rate and Speed settings Mode Rate DCV, DCI S  M  F  TC Panel operation Accuracy Speed Quick Speed   (No Speed setting) 1. Press the Shift key followed by the 2nd (Menu) key. Press the right key twice to choose the SET ADC menu. SHIFT / EXIT 2ND TRIG 2.
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GDM-8261 User Manual ADC Speed Setting Background The analog to digital converters have a Quick and Accurate Speed setting. The ADC Speed settings only apply to DCV, DCI or 2/4W resistance measurements. The ADC Speed settings can only be set if DCV, DCI or 2/4W mode is active. Setting Speed/Rate Settings Quick, Accurate (default=Accurate) The Speed settings depend on the operating mode and the rate settings.
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SYSTEM/DISPLAY CONFIGURATION 3. Press the Down key, the right key and then the down key. The Speed settings menu appears. 1st display TRIG Shows the Speed setting 4. Use the Up/Down keys to select either ACCUR or QUICK. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. SHIFT / EXIT AUTO ENTER Frequency / Period Settings Input Port Selection Background The INJACK settings set which input port is used for frequency or period measurements.
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GDM-8261 User Manual 2. Press the Down key twice. The INJACK setting appears. 1st display Indicates which input port is assigned as the input port. 3. Select the input using the Up/Down key. 4. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. SHIFT / EXIT AUTO ENTER Gate Time Setting Background The gate time settings determine the accuracy of the frequency and period measurements.
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SYSTEM/DISPLAY CONFIGURATION 2. Press the Down key, the right key and then the down key. The gate time settings menu appears. 1st display TRIG Shows the gate time setting 3. Select the gate time using the Up/Down key. 4. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display.
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GDM-8261 User Manual Identification Settings Changing the Identification String Background The *IDN? query returns the manufacturer, model number, serial number and system firmware version number. When LANG is set to COMP, a user defined manufacturer and model number is returned with the *IDN? query. Please see the SYSTem:IDNStr command on page 198 for details. Setting Panel operation NORM, COMP 1. Press the Shift key followed by the 2nd (Menu) key. The System menu appears. SHIFT / EXIT 2ND 2.
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STORE/RECALL STORE/RECALL The GDM-8261 can store and recall measurement history (for up to 9999 counts) as well as the instrument settings. For storing and recalling measurement results using the Scanner, see page 101. STORE RECALL DCI ACI Store Measurement Record .................................... 96 Recall Measurement Record ................................... 97 Save Instrument Settings ....................................... 98 Recall Instrument Settings .....................................
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GDM-8261 User Manual Store Measurement Record Background The GDM-8261 can log up to 9999 measurement results (counts) which can be stored and recalled later for analysis. Basic measurement statistics such as Maximum, Minimum, Average value as well as Standard Deviation are also recorded with the data. Note: Previously recorded measurements will be erased every time the store function is used or if power is reset.
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STORE/RECALL Recall Measurement Record Background The GDM-8261 can recall previously recorded measurement results for observation and analysis. The Standard Deviation, Maximum Value, Minimum Value and Average Value can also be viewed. Not applicable to Store/recall measurement history is not applicable to the Diode/Continuity tests Recall stored record . Press the Shift key, then the ACI (Recall) key. The stored measurement record appears.
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GDM-8261 User Manual Save Instrument Settings Background The GDM-8261 can save up to 5 instrument settings. The settings can save the state, function, I/O and range. Upon powering up, the current instrument setting is displayed.
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STORE/RECALL 1st display Shows the memory number 4. Select the memory number using the Up/Down key or select Del-All to delete the save settings in memory. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. Note SHIFT / EXIT AUTO ENTER The current instrument settings have been saved. To enable the settings at power up, follow the instructions in the next section.
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GDM-8261 User Manual 1st display Shows the memory number 4. Select the memory number using the Up/Down key. 5. Press the Enter key to confirm your selection. Press the Exit key to go back to the default display. AUTO SHIFT / EXIT ENTER When the instrument is reset or upon the next power up, the recalled settings will be enabled.
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SCANNER (OPTIONAL) SCANNER (OPTIONAL) The optional scanner, GDM-SC1, lets you effectively measure multiple channels connected to a single GDM-8261 DMM. Installation SCAN STEP ACV DCV GDM-SC1 Scanner Specifications ........................ 102 Configure Scanner ................................................ 102 Select Channel Group and Enable Scanner .......... 104 Connect Wires ...................................................... 105 Insert Scanner ................................................
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GDM-8261 User Manual GDM-SC1 Scanner Specifications 2-wire channel 16 pairs Maximum current 2A (ch17, ch18) 4-wire channel 8 pairs Resistance 2/4 wire Cold junction N/A (internal) Connection Screw terminal Single wire channel N/A Maximum voltage 250Vrms Scanner Installation Configure Scanner Open Scanner cover 1. Take off four screws from the bottom panel of the scanner. 2. Remove the top panel.
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SCANNER (OPTIONAL) 3. The connection terminals are revealed. Overview 16 general purpose channels are available, 8 on the left row, 8 on the right row. Current (ACI, DCI) measurement uses 2 extra channels. All channels are fully isolated (Hi and Lo). Scan/Step connection Refer to the below table for measurement and test line connections. Item No. of wires No.
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GDM-8261 User Manual Temp. 2W RTD 2 wires (H, L) 16 (CH1 ~ 16) Temp. 4W RTD 4 wires (Input H, 8 pairs (CH1 L + Sense H, L) [input]& 9[sense], 2&10,....8&16) Select Channel Group and Enable Scanner Background 16 channels are available for the scanner when using the GDM-8261. CH101 ~ 118 Group1 Select group (Jumper J8) Set the jumper J8 in the center of the board to the MASTER configuration. Move the jumper to the right (pins 2-3) to select CH1xx (101 ~ 118).
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SCANNER (OPTIONAL) Enable scanner (Jumper J9) Set the jumper J9 on the rear side of the board accordingly. Move the jumper up (pins 3-2) to disable the scanner, and down (pins 2-1) to enable the scanner. Disabled 3 2 1 32 1 J9 J9 Enabled 32 1 Connect Wires Wire selection Make sure the wires have at least the same voltage and current capacity as the maximum ratings of the measurement. Connection 1. Turn the screw left (loose) using a screw driver and insert the wire.
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GDM-8261 User Manual 2. Route the wires as shown below via the two openings (left and right) at the front cover. 3. Bundle the wires at the front cover using the holes at the bottom. 4. Close the top cover and tighten the screw from the bottom. Configuration Record 106 Print out the configuration record list on page 109, fill in the details, and keep it with the GDM-8261.
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SCANNER (OPTIONAL) Insert Scanner Power Off Turn the Power Off and take out the power cord. Open the GDM-8261 rear panel slot Take off the two screws on the slot corners to remove the optional slot cover. Keep the screws for later reuse.
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GDM-8261 User Manual Insert the scanner Insert the scanner bottom-side-up (already configured according to the procedures on page 102) into the slot. Close the cover by tightening the screws. Power On Connect the power cord and turn On the power. CAUTION Do not input voltages exceeding 250V to the front input terminals while the scanner module is installed. Do not connect any leads to the front input terminals while the scanner is active.
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SCANNER (OPTIONAL) Scanner Configuration Record Measurement Note type Channel Wire color CH1 H L CH2 H L CH3 H L CH4 H L CH5 H L CH6 H L CH7 H L CH8 H L CH9 H L CH10 H L CH11 H L CH12 H L CH13 H L CH14 H L CH15 H L CH16 H L CH17 H L CH18 H L CARD INPUT H L CARD SENSE H L AMPS L H 109
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GDM-8261 User Manual Setup Scan Overview Scan type Simple Sets the scanned channel range, loop count, and timer length. All channels have a common measurement item. Advanced In addition to the above Simple Scan settings, the advanced mode has custom settings for each channel, such as measurement item, range, and rate. Timer setting Sets the duration between each scan loop (Scan operation) or between each scanned channel (Step operation). Count setting Sets the number of scan operations.
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SCANNER (OPTIONAL) Measures a single channel in the specified range (Channel MIN~MAX)at each trigger event. Timer settings (page 112) apply for each channel. Step Step CH 101 Timer Timer Count# Delay Timer 1 CH 103 CH 102 Delay Timer 2 Delay CH 104 Timer 3 Delay CH 101 Timer 4 Delay CH 102 Timer 5 Delay 6 12 Example: Step through channel 1~4 with a count of 12. Monitor Selects just one channel and continuously measures it.
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GDM-8261 User Manual 4. Move the cursor to the channel using the Left/Right key, and change the value using the Up/Down key. Range 6. Move the cursor to the channel using the Left/Right key, and change the value using the Up/Down key. 8. Move the cursor to the time setting using the Left/Right key, and change the value using the Up/Down key. ENTER HOLD TRIG AUTO ENTER HOLD 1ms ~ 9999ms 9. Press the Enter key. The loop (step) Count setting appears.
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SCANNER (OPTIONAL) 10. Move the cursor to the count number using the Left/Right key, and change the value using the Up/Down key. Range HOLD TRIG 1 ~ 999 11. Press the Enter key followed by the Exit key. The setting is stored and the display goes back to the normal mode. SHIFT / EXIT AUTO ENTER Setup Advanced Scan Panel operation 1. Press the Shift key, the 2nd key (MENU), the Left key. The Scan menu appears. SHIFT / EXIT MENU 2ND HOLD 2. Press the Down key followed by the Right key.
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GDM-8261 User Manual 4. Move the cursor to the channel using the Left/Right key, and change the value using the Up/Down key. Range 6. Move the cursor to the channel using the Left/Right key, and change the value using the Up/Down key. 8. Move the cursor to the timer setting using the Left/Right key, and change the value using the Up/Down key. 114 ENTER HOLD TRIG AUTO ENTER HOLD 1ms ~ 9999ms 9. When finished, press the Enter key. The Count setting appears.
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SCANNER (OPTIONAL) 10. Move the cursor to the count number using the Left/Right key, and change the value using the Up/Down key. 11. When finished, press the Enter key. The channel setting appears. HOLD TRIG AUTO ENTER 12. The Minimum (first) scanned channel appears. The default setting is CH101. DC AUTO S m V 13. Set the measurement conditions.    To select measurement item, press the target key. To select Auto range, press the AUTO key.
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GDM-8261 User Manual Use External Trigger Background The GDM-8261 uses the internal trigger by default. Using an external trigger allows customized triggering. Signal connection Connect the external trigger signal to the Digital I/O port located on the rear panel.
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SCANNER (OPTIONAL) Run Scan Overview Scan operation type Scan Measures all the specified channel ranges at each trigger event. The timer settings (page 112) apply to each scan. Step Measures a single channel in the specified range at each trigger event. The timer settings (page 112) apply to each channel. Monitor Continuously measures one channel. Run Scan/Step Activate Scan/Step 1. Press the Shift key followed by the ACV key (Scan) or DCV key (Step).
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GDM-8261 User Manual Recall Scan/Step Result Panel operation 1. After the Scan/Step is completed, the data is stored internally. Press the Shift key followed by the ACI (Recall) key. RECALL SHIFT / EXIT ACI 2. The first channel appears. (example: channel 101) DC m V RCL 3. To view the Standard Deviation/Min/ Max/Average data, press the Left and Right keys.   HOLD TRIG  4. To move to the next channel, press the Up/Down key. 5. Press the Exit key to get out from recall mode.
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SCANNER (OPTIONAL) 3. Press the Down key. The channel selection appears. 4. Move the cursor to the channel using the Left/Right key, and change the channel number using the Up/Down keys. 5. When finished, press the Enter key. The Monitoring starts.
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GDM-8261 User Manual DIGITAL I/O The rear panel Digital I/O terminal outputs the result of Compare measurements to external devices. COMP HOLD Terminal configuration Digital I/O Terminal Configuration ...................... 121 Application Application: Compare measurement .................... 122 Application: External trigger ................................
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DIGITAL I/O Digital I/O Terminal Configuration Background The digital I/O terminal outputs the result of Compare measurements to control external devices. By providing separate VCC power for the terminal, the outputs can also be used as a power source for TTL and CMOS circuits. Pin assignment Connector type: DB-9 female High Limit FAIL Out FAIL Out 67 8 9 LOW Limit FAIL Out EOM Out 1 2 34 5 VCC Out NC PASS Out External Trigger In Digital (chassis) Ground Pin1 VCC output, 5V.
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GDM-8261 User Manual Pin6 FAIL signal Output. Activates when the compare result is FAIL. Pin7 HIGH Limit FAIL signal Output. Activates when the compare result is FAIL due to violating the HIGH Limit. Pin8 LOW Limit FAIL signal Output. Activates when the compare result is FAIL due to violating the LOW Limit. Pin9 EOM (End Of Measurement) signal Output. Activates when compare measurement is over. It is also available in other measurements.
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DIGITAL I/O 2. Change the parameter using the Up/Down key. 3. Press the Enter key to confirm editing and move to the low limit setting. 3. Low limit setting 5. Result ENTER V 1st display Shows the low limit value 2nd display Indicates low limit setting Set the low limit in the same way as in the high limit. Press the Enter key to confirm editing. The compare measurement starts right away. 4.
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GDM-8261 User Manual Digital I/O: FAIL Out (Pin 6) and LOW Limit FAIL Out (Pin 8) are activated. If the 2nd display shows Pass, the result is staying between the High and the Low limit. Pass Digital I/O: PASS Out (Pin 5) is activated.
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DIGITAL I/O Application: External trigger Background The GDM-8261 uses the internal trigger by default, for example to count the frequency and the period. Using an external trigger allows for customized triggering conditions. Signal connection Connect the external trigger signal to the Digital I/O port located on the rear panel.
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GDM-8261 User Manual 2. Start trigger Press the Trig key to start triggering manually. The indicator turns On. AC AUTO TRIG S m V Reading indicator The reading indicator stays On before triggering. After triggering, the indicator flashes according to the external signal trigger timing. Exit external trigger 126 Press the Shift key followed by the Trig key. The EXT indicator disappears and the trigger goes back to internal mode.
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REMOTE CONTROL REMOTE CONTROL Interface Overview .............................................................. 129 Configure USB Interface ....................................... 129 Configure RS-232C Interface ................................ 130 Set the EOL Character .......................................... 131 Set the Separation Character ................................ 132 Set the Return Format .......................................... 133 Insert GPIB Card ........................................
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GDM-8261 User Manual TRIGger Commands ............................................. 194 SYSTem Related Commands ................................ 196 STATus Report Commands ................................... 199 RS-232C Interface Commands ............................. 199 IEEE 488.2 Common Commands ......................... 199 ROUTe Commands ...............................................
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REMOTE CONTROL Configure Interface Overview Interface type USB Device USB 1.1 or 2.0, TypeA, female connector. RS-232C D-sub 9 pin, male connector. Baud rate: 230400/115200/57600/38400/19200/ 9600. Data bits: 8, Parity: none, Stop bits: 1, Flow control: none. GPIB (optional) 24 Pin female GPIB port LAN (optional) Return to Local control mode 10BaseT/100BaseTx In order to switch back to the Local control mode (front panel operation), press the LOCAL key.
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GDM-8261 User Manual 3. Press the Down key. The USB ON/OFF selection appears. 4. Press the Up/Down key to select ON or OFF. 5. Press the Enter key followed by the Exit key. The USB setting is stored and the display goes back to the default display. SHIFT / EXIT AUTO ENTER 6. Connect the USB cable to the rear panel terminal (upper port). KEY CAL Configure RS-232C Interface Configuration step 1.
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REMOTE CONTROL 4. Press the Down or UP keys repeatedly to select the baud rate. 2304001152005760038400192009600 5. Press the Enter key followed by the Exit key. The RS-232 setting is stored and the display goes back to the default display. AUTO SHIFT / EXIT ENTER 6. Connect the RS-232C cable to the rear panel terminal.
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GDM-8261 User Manual 2. Press the Down key. The EOL menu appears. 3. Press the Down key. The EOL selection menu appears. 4. Press the Up/Down key to select the EOL character.   5. Press the Enter key followed by the Exit key. The EOL setting is stored and the display goes back to the default display. AUTO SHIFT / EXIT ENTER Set the Separation Character Description The TX TERM configuration menu can set the separation character for remote commands. Configuration 1.
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REMOTE CONTROL 2. Press the Down key and then the Right key. The SEP selection display appears. TRIG 3. Press the Down key. The SEP selection menu appears. 4. Press the Up/Down key to select the separation character. (CR+LF/LF/CR) 5. Press the Enter key followed by the Exit key. The SEP setting is stored and the display goes back to the default display.
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GDM-8261 User Manual V+U+C Configuration Value, Unit, Count# +0.503E-4, V DC, +00001# 1. Press the Shift key, the 2nd (Menu) key, the left key repeatedly until the TX TERM configuration menu appears. SHIFT / EXIT MENU 2ND HOLD 2. Press the Down key, the Left key. The FORMAT menu appears. HOLD 3. Press the Down key. The FORMAT selection menu appears. 4. Press the Up/Down key to select the Return format.    5. Press the Enter key followed by the Exit key.
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REMOTE CONTROL Insert GPIB Card Power Off Turn the Power Off and take out the power cord. Open the GDM-8261 optional communication port Take off the two screws on the slot corners to remove the optional communication port cover. Keep the screws for later reuse. Insert the GPIB card Insert the GPIB card into the slot. Close the cover by tightening the screws.
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GDM-8261 User Manual Power On Connect the power cord and turn On the power. Configure GPIB Interface GPIB port configuration 1. Press the Shift key, the 2nd (Menu) key, and then the left key repeatedly until the I/O configuration menu appears. 2. Press the Down key and the Left key repeatedly until the GPIB selection display appears. Note: The GPIB menu will be selectable only when the GPIB card is installed. 3. Press the Down key. The GPIB ON/OFF selection appears. 4.
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REMOTE CONTROL 5. To continue to the GPIB address configuration, press the Enter key. The GPIB address configuration menu appears. 1st display AUTO ENTER Shows the GPIB address. 2nd display Indicates GPIB address setting 6. Change the address using the Left/Right and Up/Down keys. Range HOLD TRIG 0~30 (Default = 15) 7. Press the Enter key followed by the Exit key. The GPIB setting is stored and the display goes back to the default display. AUTO SHIFT / EXIT ENTER 8.
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GDM-8261 User Manual 9 IFC 21 Ground (IFC) 10 SRQ 22 Ground (SRQ) 11 ATN 23 Ground (ATN) 12 SHIELD Ground 24 Single GND Insert Ethernet Card Power Off Turn the Power Off and take out the power cord. Open the GDM-8261 optional communication port Take off the two screws on the slot corners to remove the optional communication port cover. Keep the screws for later reuse.
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REMOTE CONTROL Insert the Ethernet card Insert the Ethernet card into the slot. Close the cover by tightening the screws. Power On Connect the power cord and turn on the power. Initialize Execute the INIT function to initialize the LAN settings, see page 151 for details. Activate Ethernet Interface Ethernet(LAN) port activation 1. Press the Shift key, the 2nd (Menu) key, and then the Left key repeatedly until the I/O configuration menu appears.
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GDM-8261 User Manual 2. Press the Down key and the Left key repeatedly until LAN selection display appears. HOLD Note: The LAN menu will be selectable only when the LAN card is installed. 3. Press the Down key. The LAN ON/OFF selection appears. 4. Press the Up/Down key to select ON or OFF. ON will turn the LAN option on, OFF will turn the LAN option off. Note: Ethernet configuration settings can only be edited when LAN is set to ON. 5. Press the Enter key followed by the Exit key.
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REMOTE CONTROL Configure Ethernet Interface (RESET) Background The RESET command is used to reset the Ethernet card when new settings have been made. When the DHCP, IP, subnet, gateway or DNS settings have been edited, use the RESET command to validate the changes and reset the Ethernet card to the new configuration settings. New Ethernet configuration settings are only updated after the Ethernet card has been reset. Ethernet port configuration 1.
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GDM-8261 User Manual 5. Press the Enter key followed by the Exit key. The Ethernet card will be reset after the exiting the menu system. AUTO SHIFT / EXIT ENTER After the exiting the configuration menu, the Ethernet card will reset. Resetting the Ethernet card takes approximately 5 to 10 seconds.
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REMOTE CONTROL 2. Press the Down key and the Right key. The DHCP selection display appears. TRIG 3. Press the Down key. The DHCP ON/OFF selection appears. 4. Press the Up/Down key to select ON or OFF. ON will turn on DHCP, OFF will turn off DHCP. 5. Press the Enter key followed by the Exit key. 2. Reset LAN card SHIFT / EXIT AUTO ENTER 1. To make any changes take effect, set RESET to YES. See page 141 for details.
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GDM-8261 User Manual 2. Press the Down key and the Right key twice. The IP selection display appears. TRIG TRIG Note: The IP address can only be edited if DHCP is off. 3. Press the Down key. The IP address selection appears. IP1 IP2 IP3 IP4 The IP address is divided in 4 groups; IP1:IP2:IP3:IP4. The cursor will be flashing on IP1 (indicated by ―X‖). 4. Use the Left/Right keys to move the cursor to the IP1 value and select a digit. HOLD TRIG 5. Press the Up/Down key to edit the selected digit. 6.
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REMOTE CONTROL 8. Press the Exit key to exit from the configuration menu. 2. Subnet Configuration 1. Press the Shift key, the 2nd (Menu) key, and the Left key repeatedly until the SET LAN configuration menu appears. SHIFT / EXIT SHIFT / EXIT MENU 2ND HOLD Note: SET LAN will only be available after LAN has been activated in the I/O menu, see page 139. 2. Press the Down key and the Right key repeatedly until the SUBNET selection display appears.
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GDM-8261 User Manual 4. Use the Left/Right keys to move the cursor to the S1 value and select a digit. HOLD TRIG 5. Press the Up/Down key to edit the selected digit. 6. Press the Enter key to confirm and automatically go onto S2. AUTO ENTER 7. Repeat steps 4 to 6 for S2, S3 and S4. 8. Press the Exit key to exit from the configuration menu. 3. Gateway Configuration 1. Press the Shift key, the 2nd (Menu) key, and the Left key repeatedly until the SET LAN configuration menu appears.
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REMOTE CONTROL 2. Press the Down key and the Right key repeatedly until the GATEWAY selection display appears. TRIG Note: The gateway can only be edited if DHCP is off. 3. Press the Down key. The GATEWAY address selection appears. G1 G2 G3 G4 The gateway address is divided in 4 groups; G1:G2:G3:G4. The cursor will be flashing on G1 (indicated by ―X‖). 4. Use the Left/Right keys to move the cursor to the G1 value and select a digit. HOLD TRIG 5. Press the Up/Down key to edit the selected digit. 6.
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GDM-8261 User Manual 8. Press the Exit key to exit from the configuration menu. 4. DNS Configuration 1. Press the Shift key, the 2nd (Menu) key, and the Left key repeatedly until the SET LAN configuration menu appears. SHIFT / EXIT MENU SHIFT / EXIT 2ND HOLD Note: SET LAN will only be available after LAN has been activated in the I/O menu, see page 139. 2. Press the Down key and the Right key repeatedly until the DNS selection display appears.
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REMOTE CONTROL 5. Press the Up/Down key to edit the selected digit. 6. Press the Enter key to confirm and automatically go onto D2. AUTO ENTER 7. Repeat steps 4 to 6 for D2, D3 and D4. 8. Press the Exit key to exit from the configuration menu. 5. Reset LAN card SHIFT / EXIT 1. To make any changes take effect, set RESET to YES. See page 141 for details. View MAC Address View MAC Address 1.
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GDM-8261 User Manual 3. Press the Down key. The MAC address appears. 4. Press the Exit key to exit from the configuration menu. SHIFT / EXIT Configure Telnet Port Background The GDM-8261 can set the telnet port used for virtual private networks. By default the telnet port is set to port 23. 1.Telnet Port Configuration 1. Press the Shift key, the 2nd (Menu) key, and the Left key repeatedly until the SET LAN configuration menu appears.
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REMOTE CONTROL 3. Press the Down key. The Telnet port appears. 4. Change the telnet port using the Left/Right and Up/Down keys. Range HOLD TRIG 1~65535(Default = 23) 5. Press the Enter key followed by the Exit key to confirm and exit the configuration menu. AUTO SHIFT / EXIT ENTER Return to Initial Settings Background The INIT function is used to return the GDM-8261 back to the original LAN settings. This will also reset the web password back to 123456 if the password has been forgotten.
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GDM-8261 User Manual Return to Initial Settings 1. Press the Shift key, the 2nd (Menu) key, and the Left key repeatedly until the SET LAN configuration menu appears. MENU SHIFT / EXIT 2ND HOLD Note: SET LAN will only be available after LAN has been activated in the I/O menu, see page 139. 2. Press the Down key and then the Right key repeatedly until the INIT selection display appears. TRIG 3. Press the Down key. The INIT NO/YES selection appears. 4. Press the Up/Down key to select NO or YES.
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REMOTE CONTROL If the GDM-8261 is returned to the initial settings, a reset is performed automatically (page 141) after exiting the configuration menu. Note Resetting the Ethernet card takes approximately 5 to 10 seconds. The continuity icon (/ ) is used to indicate the status of the Ethernet card after it has been reset: (flashing): indicates that the Ethernet card is resetting / / (flashing → turns off): indicates that the Ethernet card has finished resetting.
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GDM-8261 User Manual 3. Press the Down key. The WEB PW ON/OFF selection appears. 4. Press the Up/Down key to select ON or OFF. When set to ON a password is required to enter the browser control page, When set to OFF, a password is not required to enter the browser control page. 5. Press the Enter key followed by the Exit key to confirm the settings and exit from the configuration menu. Note AUTO SHIFT / EXIT ENTER The web password is set to 123456 by default.
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REMOTE CONTROL 3. Run this query via the terminal application: *idn? The command will return the instrument manufacturer, model number, serial number and firmware version in the following format: >GWInstek,GDM8261,00000000,1.0 4. See page 160 for more details on remote commands.
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GDM-8261 User Manual Web Control Interface The web control interface is accessible with the optional Ethernet card. The web control interface allows remote access over LAN using a Java-enabled web browser. The web control interface allows a web browser to modify parameter settings, remotely operate, control and monitor the GDM-8261 with a virtual front panel that mimics the GDM-8261 front panel interface.
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REMOTE CONTROL Note If the password dialog box or the Welcome Page fail to appear when WEB PW is set to ON, please ensure JavaScript and prompting for scripted windows are enabled in your web browser.
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GDM-8261 User Manual 3. View and Modify LAN Configuration The current Ethernet settings can be viewed and modified from the web control interface. Settings that cannot be edited using the GDM-8261 front panel, such as the web password, can be edited from the web control interface. 1. To edit or view the current configuration settings, click on the View & Modify Configuration icon. 2. The configuration settings appear.
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REMOTE CONTROL 3. The View & Modify Configuration page allows you to:  View the instrument name, firmware revision of the Ethernet card, IP address and MAC address.  Set the IP address to DHCP or static.  Configure the module host name, UPnP port number, telnet port number and telnet timeout time.  Modify the web password.  Restore the Ethernet card to the factory default settings (equivalent to the INIT function).
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GDM-8261 User Manual Command Syntax The commands are partially compatible with IEEE488.2 (1992) and SCPI (1994) standard. Commands are NON-case sensitive. Example command CONF : VOLT : DC 1 0 , MAX 1: Command Header 2: Single space 1 2 34 5 3: Parameter 1 4: Comma (no space after comma) 5: Parameter 2 Parameter example Boolean Boolean logic: 0 or 1. Used for On (1) or Off (0) command. NR1 Integer: 0, 1, 2, 3..... NR2 Decimal number: 0.0, 0.1, 0.2,.... NR3 Floating point number: 4.5e-1, 8.
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REMOTE CONTROL Message Separator EOL or , Command separator, user configurable (excluding GPIB), see page 132. Square Brackets [] Square brackets denote function commands or parameters that can be omitted from the command or query. For example the query, [SENSe:]UNIT? can be expressed in 2 valid forms: [SENSe:]UNIT? or UNIT? Command Set CONFigure:VOLTage:DC ......................................................................... 169 CONFigure:VOLTage:AC ...............................................
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GDM-8261 User Manual CONFigure2:FUNCtion? .......................................................................... 173 CONFigure2:RANGe? .............................................................................. 173 CONFigure2:AUTO .................................................................................. 173 CONFigure2:AUTO? ................................................................................ 173 MEASure:VOLTage:DC? .................................................................
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REMOTE CONTROL [SENSe:]TEMPerature:FRTD:TYPE? ........................................................ 179 [SENSe:]TEMPerature:FRTD:ALPHa ....................................................... 179 [SENSe:]TEMPerature:FRTD:ALPHa?...................................................... 179 [SENSe:]TEMPerature:FRTD:BETA .......................................................... 179 [SENSe:]TEMPerature:FRTD:BETA? ........................................................ 179 [SENSe:]TEMPerature:FRTD:DELTa.........
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GDM-8261 User Manual [SENSe:]FUNCtion[1/2]............................................................................ 183 [SENSe:]VOLTage:DC:RANGe .................................................................. 183 [SENSe:]VOLTage:DC:RANGe? ................................................................ 183 [SENSe:]VOLTage:AC:RANGe .................................................................. 183 [SENSe:]VOLTage:AC:RANGe? .................................................................
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REMOTE CONTROL [SENSe:]CURRent:DC:RESolution? ......................................................... 187 [SENSe:]CURRent:AC:RESolution............................................................ 187 [SENSe:]CURRent:AC:RESolution? .......................................................... 187 [SENSe:]RESistance:RESolution .............................................................. 187 [SENSe:]RESistance:RESolution? ............................................................
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GDM-8261 User Manual CALCulate:LIMit:UPPer? .......................................................................... 192 CALCulate:DB:REFerence......................................................................... 192 CALCulate:DB:REFerence? ....................................................................... 192 CALCulate:DBM:REFerence ..................................................................... 192 CALCulate:DBM:REFerence? ..................................................................
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REMOTE CONTROL SYSTem:BEEPer:STATe? ........................................................................... 196 SYSTem:BEEPer:ERRor ............................................................................ 196 SYSTem:BEEPer:ERRor? ........................................................................... 196 SYSTem:ERRor?........................................................................................ 196 SYSTem:VERSion? ........................................................................
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GDM-8261 User Manual *SRE? ........................................................................................................ 200 *SRE.......................................................................................................... 200 *STB? ........................................................................................................ 200 *TRG ......................................................................................................... 200 ROUTe:CLOSe ...................
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REMOTE CONTROL CONFigure Commands CONFigure:VOLTage:DC Sets measurement to DC Voltage on the first display and specifies range/resolution. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution(| MIN | MAX | DEF)] Example: CONF:VOLT:DC 1,MAX Sets the voltage range to 1 volt and the resolution to the maximum. CONFigure:VOLTage:AC Sets measurement to AC Voltage on the first display and specifies range/resolution.
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GDM-8261 User Manual CONFigure:FRESistance Sets measurement to 4W Resistance on the first display and specifies the range/resolution. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution( | MIN | MAX | DEF)] Example: CONF:FRES 10e3,MAX Sets the measurement mode to 4W with a range of 10kΩ at the maximum resolution. CONFigure:FREQuency Sets measurement to Frequency on the first display and specifies range/resolution.
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REMOTE CONTROL CONFigure:TEMPerature:RTD Sets the measurement mode to 2W RTD measurement mode on the first display. Sets the sensor type. Parameter: [None] | [Type(PT100 | D100 | F100 | PT385 | PT3916 | USER)] Example: CONF:TEMP:RTD PT100 Sets the sensor type to PT100 and sets the measurement mode to 2W RTD CONFigure:FUNCtion? Returns the current function on 1st display.
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GDM-8261 User Manual CONFigure2:VOLTage:AC Sets measurement to AC Voltage on the second display and specifies range/resolution. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution( | MIN | MAX | DEF)] Example: CONF2:VOLT:AC Sets the measurement mode to AC voltage. CONFigure2:CURRent:DC Sets measurement to DC Current on the second display and specifies range/resolution.
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REMOTE CONTROL CONFigure2:FREQuency Sets measurement to Frequency on the second display and specifies range/resolution. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution( | MIN | MAX | DEF)] Example: CONF2:FREQ MAX,MAX Sets the frequency measurement range to max and the resolution to max. CONFigure2:PERiod Sets measurement to Period on the second display and specifies the range/resolution.
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GDM-8261 User Manual Measure Commands MEASure:VOLTage:DC? Returns the DC voltage measurement on the first display. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution(| MIN | MAX | DEF)] Example: MEAS:VOLT:DC ? >+0.488E-4 Returns the DC voltage measurement as 0.0488 mV. MEASure:VOLTage:AC? Returns the AC voltage measurement on the first display. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution(| MIN | MAX | DEF)] Example: MEAS:VOLT:AC ? >+0.
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REMOTE CONTROL MEASure:FRESistance? Returns the 4W resistance measurement on the first display. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution(| MIN | MAX | DEF)] Example: MEAS:FRES? > +1.181372E+6 Returns the 4W measurement. MEASure:FREQuency? Returns the frequency measurement on the first display. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution(| MIN | MAX | DEF)] Example: MEAS:FREQ? > +0.215029E+5 Returns the frequency (21.5 kHz).
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GDM-8261 User Manual MEASure:TEMPerature:FRTD? Returns the 4W RTD temperature for the selected sensor type on the first display. Parameter:[NONE] | PT100 | D100 | F100 | PT385 | PT3916 | USER Example: MEAS:TEMP:FRTD? PT100 > +0.20050E+5 Returns the temperature. MEASure:TEMPerature:RTD? Returns the 2W RTD temperature for the selected sensor type on the first display. Parameter:[NONE] | PT100 | D100 | F100 | PT385 | PT3916 | USER Example: MEAS:TEMP:RTD? PT100 > +0.20050E+5 Returns the temperature.
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REMOTE CONTROL MEASure2:RESistance? Returns the 2W resistance measurement on the second display. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution(| MIN | MAX | DEF)] Example: MEAS2:RES? > +1.181372E+6 Returns the 2W measurement. MEASure2:FRESistance? Returns the 4W resistance measurement on the second display. Parameter: [None] | [Range( | MIN | MAX | DEF),Resolution(| MIN | MAX | DEF)] Example: MEAS2:FRES? > +1.181372E+6 Returns the 4W measurement.
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GDM-8261 User Manual [SENSe:]TEMPerature:RJUNction:SIMulated Set temperature simulation value. Parameter: (0.00 ~ 50.00) Example: SENS:TEMP:RJUN:SIM 25.00 Sets the thermocouple junction temperature to 25˚C. [SENSe:]TEMPerature:RJUNction:SIMulated? Returns temperature simulation value. Return parameter: (+0000~+5000) ,where +0000=0.00˚C, +5000=50.00˚C [SENSe:]TEMPerature:RTD:TYPE Sets the 2W RTD sensor type.
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REMOTE CONTROL [SENSe:]TEMPerature:FRTD:TYPE Sets the 4W RTD sensor type. Parameter: Type(PT100 | D100 | F100 | PT385 | PT3916 | USER) Example: SENS:TEMP:FRTD:TYPE PT100 Sets the 4W RTD sensor to PT100 [SENSe:]TEMPerature:FRTD:TYPE? Returns the 4W RTD sensor type. Return parameter: PT100, D100, F100, PT385, PT3916, USER [SENSe:]TEMPerature:FRTD:ALPHa Sets the 4W RTD Alpha coefficient. Parameter: (0~10) Example: SENS:TEMP:FRTD:ALPH 0.
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GDM-8261 User Manual [SENSe:]AVERage:TCONtrol Selects the digital filter. Parameter: MOV | REP Example: SENS:AVER:TCON MOV Sets the digital filter to the Moving filter. [SENSe:]AVERage:TCONtrol? Returns the current digital filter type. Return parameter: MOV (moving), REP (repeating) [SENSe:]AVERage:COUNt Sets the digital filter count. Parameter: (2 ~ 100) | MIN | MAX Example: SENS:AVER:COUN 100 Sets the digital filter count number to 100. [SENSe:]AVERage:COUNt? Returns the digital filter count.
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REMOTE CONTROL [SENSe:]PERiod:APERture? Returns the aperture time (gate time) for the period function. [SENSe:]FREQuency:INPutjack Assigns an input port for the frequency function. Parameter: (0|1|2) 0=volt, 1=1A, 2=10A Example: SENS:FREQ:INP 0 Sets the input jack to the Volt input port. [SENSe:]FREQuency:INPutjack? Returns the assigned input port used for the frequency function. Return Parameter: VOLT, 1A, 10A [SENSe:]PERiod:INPutjack Assigns an input port for the period function.
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GDM-8261 User Manual [SENSe:]GAIN:AUTO? Returns the Auto gain mode. Return parameter: 0|1, 1=ON, 0=OFF [SENSe:]CONTinuity:THReshold Sets the continuity threshold in ohms. Parameter: (0 ~ 1000) Example: SENS:CONT:THR 500 Sets the continuity threshold to 500 [SENSe:]CONTinuity:THReshold? Returns the continuity threshold. [SENSe:]CURRent:DETect Sets the current auto-detect mode on or off for the current functions.
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REMOTE CONTROL [SENSe:]FUNCtion[1/2] Sets the function for the first or second display. Parameter: (display1):"VOLT[:DC]", "VOLT:AC", "CURR[:DC]", "CURR:AC", "RES", "FRES", "FREQ", "PER", "TEMP:RTD", "TEMP:FRTD", "TEMP:TCO", "DIOD", "CONT" (display2): "VOLT[:DC]", "VOLT:AC", "CURR[:DC]", "CURR:AC", "RES", "FRES", "FREQ", "PER", "NON" Example: SENS:FUNC1 "VOLT:DC" Sets the 1st display to the DCV function. [SENSe:]VOLTage:DC:RANGe Sets the DC Voltage measurement range.
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GDM-8261 User Manual [SENSe:]CURRent:AC:RANGe? Returns the AC Current measurement range. Parameter: [None] | [MIN | MAX] [SENSe:]RESistance:RANGe Sets the 2W resistance measurement range. Parameter: Range( | MIN | MAX) Example: SENS:RES:RANG 1000 Sets the resistance range to 1kΩ. [SENSe:]RESistance:RANGe? Returns the 2W resistance measurement range. Parameter: [None] | [MIN | MAX] [SENSe:]FRESistance:RANGe Sets the 4W resistance measurement range.
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REMOTE CONTROL [SENSe:]VOLTage:DC:RANGe:AUTO Sets the DC voltage Auto range on/off. Parameter: ON | OFF Example: SENS:VOLT:DC:RANG:AUTO ON Turns Auto-range on for DC voltage measurements. [SENSe:]VOLTage:DC:RANGe:AUTO? Returns the DC voltage Auto-range settings. Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]VOLTage:AC:RANGe:AUTO Sets the AC voltage Auto range on/off. Parameter: ON|OFF Example: SENS:VOLT:AC:RANG:AUTO ON Turns Auto-range on for AC voltage measurements.
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GDM-8261 User Manual [SENSe:]RESistance:RANGe:AUTO? Returns the 2W resistance Auto-range setting. Return parameter: 0|1, 0=OFF, 1=ON [SENSe:]FRESistance:RANGe:AUTO Sets the 4W resistance Auto-range settings on/off. Parameter: ON|OFF Example: SENS:FRES:RANG:AUTO ON Turns Auto-range on for 4W resistance measurements. [SENSe:]FRESistance:RANGe:AUTO? Returns the 4W resistance Auto-range setting.
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REMOTE CONTROL [SENSe:]VOLTage:AC:RESolution Sets the AC Voltage measurement resolution. The resolution depends on the rate and range settings. Parameter: Resolution( | MIN | MAX) Example: SENS:VOLT:AC:RES MAX Sets the AC Voltage resolution to MAX. [SENSe:]VOLTage:AC:RESolution? Returns the AC Voltage resolution. Parameter: [None] | [MIN | MAX] [SENSe:]CURRent:DC:RESolution Sets the DC Current measurement resolution. The resolution depends on the rate and range settings.
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GDM-8261 User Manual [SENSe:]FRESistance:RESolution Sets the 4W Resistance measurement resolution. The resolution depends on the rate and range settings. Parameter: Resolution( | MIN | MAX) Example: SENS:FRES:RES 0.01 Sets the 4W Resistance resolution to 0.01 [SENSe:]FRESistance:RESolution? Returns the 4W Resistance resolution. Parameter: [None] | [MIN | MAX] [SENSe:]CONTinuity:RESolution Sets the Continuity measurement resolution. The resolution depends on the rate and range settings.
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REMOTE CONTROL [SENSe:]TEMPerature:FRTD:RESolution Sets the 4W RTD measurement resolution. The resolution depends on the rate and range settings. Parameter: Resolution( | MIN | MAX) Example: SENS:TEMP:FRTD:RES MAX Sets the 4W RTD resolution to the maximum. [SENSe:]TEMPerature:FRTD:RESolution? Returns the 4W RTD measurement resolution. Parameter: [None] | [MIN | MAX] [SENSe:]TEMPerature:RTD:RESolution Sets the 2W RTD measurement resolution. The resolution depends on the rate and range settings.
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GDM-8261 User Manual [SENSe:]CURRent:DC:NPLCycles? Returns the integration time for DC Current measurement in PLCs (power line cycles). Where one PLC is equal to 16.6 milliseconds. Return parameter: 0.025, 0.1, 0.25, 1, 2, 12 [SENSe:]RESistance:NPLCycles Sets the integration time for 2W resistance measurements in PLCs (power line cycles). Where one PLC is equal to 16.6 milliseconds. For any parameter, the DMM will automatically set the PLC to the closest acceptable PLC value (0.025, 0.1, 0.
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REMOTE CONTROL CALCulate:STATe Turns the Advanced function on/off. Parameter: ON|OFF Example: CALC:STAT OFF Turns the Advanced function off. CALCulate:STATe? Returns the status of the Advanced function. Return Parameter: 0 | 1, 1=ON, 0=OFF CALCulate:MINimun? Returns the minimum value from the Max/Min measurement. CALCulate:MAXimun? Returns the maximum value from the Max/Min measurement. CALCulate:HOLD:REFerence Sets the percentage threshold for the Hold function. Parameter: (0.01, 0.
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GDM-8261 User Manual CALCulate:LIMit:UPPer? Returns the upper limit of the compare function. CALCulate:DB:REFerence Sets the reference value for the dB function. Parameter: | MIN | MAX Example: CALC:DB:REF MAX Sets the reference voltage for dB measurements to the maximum allowed. CALCulate:DB:REFerence? Returns the reference voltage from the dB function. CALCulate:DBM:REFerence Sets the resistance value for the dBm function.
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REMOTE CONTROL CALCulate:AVERage:MINimum? Returns the minimum recorded value. Parameter: None | (0~2) 0=Store, 1=Scan, 2=Stats CALCulate:AVERage:MAXimum? Returns the maximum recorded value. Parameter: None | (0~2) 0=Store, 1=Scan, 2=Stats CALCulate:AVERage:AVERage? Returns the average recorded value. Parameter: None | (0~2) 0=Store, 1=Scan, 2=Stats CALCulate:AVERage:PTPeak? Returns the recorded peak to peak value (max value – min value).
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GDM-8261 User Manual CALCulate:NULL:OFFSet Sets the reference value for the relative function. This command is analogous to the CALCulate:REL:REFerence command. Parameter: | MIN | MAX Example: CALC:NULL:OFFS MAX Sets the reference value to the maximum allowed. CALCulate:NULL:OFFSet? Returns the reference value from the relative function. This query is analogous to the CALCulate:REL:REFerence? query. TRIGger Commands READ? VAL1? VAL2? Returns 1st and 2nd display value.
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REMOTE CONTROL TRIGger:DELay Sets the trigger delay in milliseconds Parameter: (0 ~ 9999) | MIN | MAX Example: TRIG:DEL MAX Sets the trigger delay to the maximum. TRIGger:DELay? Returns the trigger delay time in milliseconds. Parameter: None | MIN | MAX TRIGger:AUTO Turns Trigger Auto mode on/off. Parameters: ON | OFF Example: TRIG:AUTO OFF Turns the Trigger Auto mode off. TRIGger:AUTO? Returns the Trigger Auto mode. Return parameter: 0|1, 0=OFF, 1=ON SAMPle:COUNt Sets the number of samples.
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GDM-8261 User Manual SYSTem Related Commands SYSTem:BEEPer:STATe Selects the beeper mode; no beep, beep on fail and beep on pass. Parameter: (0 | 1 | 2) 0=no beep, 2=fail, 1=pass Example: SYST:BEEP:STAT 0 Turns the beeper off. SYSTem:BEEPer:STATe? Returns the beeper mode. Return parameter: Beep on Pass | Beep on Fail | No Beep SYSTem:BEEPer:ERRor Sets the beeper to sound on an SCPI error. Parameter: ON | OFF Example: SYST:BEEP:ERR ON Allows the beeper to sound when an SCPI error occurs.
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REMOTE CONTROL SYSTem:OUTPut:FORMat? Returns the output format. Return parameter: (0|1|2|3) (0=V, 1=V+U, 2=V+C, 3=V+U+C) SYSTem:OUTPut:EOF Sets the EOL character (CR+LF, LF, CR). Parameter: (0 | 1 | 2) (0=CR+LF, 1=LF, 2=CR) Example: SYST:OUTP:EOF 0 Sets the EOL character as CR+LF. SYSTem:OUTPut:EOF? Returns the EOL character. Return parameter: (0 | 1 | 2) (0=CR+LF, 1=LF, 2=CR) SYSTem:OUTPut:SEParate Sets the command separation character.
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GDM-8261 User Manual SYSTem:SCPi:MODE Sets the SCPI mode. The SCPI mode is used to determine whether the *IDN? query returns the “Normal” or “Compatible” identification string . See the SYSTem:IDNStr command for details. Parameter: NOR | COMP (NOR=Normal, COMP= Compatible) Example: SYST:SCP:MODE NOR Sets the SCPI mode to normal. SYSTem:SCPi:MODE? Returns the SCPI mode. The SCPI mode is used to determine whether the *IDN? query returns the “Normal” or “Compatible” identification string .
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REMOTE CONTROL STATus Report Commands STATus:QUEStionable:ENABle Set bits in the Questionable Data Enable register. STATus:QUEStionable:ENABle? Returns the contents of the Questionable Data Enable register. STATus:QUEStionable:EVENt? Returns the contents of the Questionable Data Event register. STATus:PRESet Clears the Questionable Data Enable register. Example: STAT:PRES RS-232C Interface Commands SYSTem:LOCal Enables local control (front panel control) and disables remote control.
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GDM-8261 User Manual *ESR? Returns and clears SESR (Standard Event Status Register). Example: *ESR? >198 Returns 198. SESR=11000110 *IDN? Returns the manufacturer, model No., serial number and system version number. Example: *IDN? >GWInstek,GDM8261,00000000,1.0 *OPC? “1” is placed in the output queue when all the pending operations are completed. *OPC Sets operation complete bit (bit0) in SERS (Standard Event Status Register) when all pending operations are completed.
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REMOTE CONTROL ROUTe Commands ROUTe:CLOSe Close a specified scanner channel. Parameter: (101~118) Example: ROUT:CLOS 102 Closes channel 102. ROUTe:OPEN:ALL Opens all scanner channels. ROUTe:MULTiple:OPEN Enable all channels in a specified range. Channels that are not in the range are not affected. Parameter: (101~118) Example: ROUT:MULT:OPEN 105,110 Channels 105 to 110 are enabled. ROUTe:MULTiple:STATe? Returns the status of all the scanner channels that are open.
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GDM-8261 User Manual ROUTe:CHANnel Advanced configuration mode for the scanner channels. The channel function, voltage and Auto-range mode can be configured.
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REMOTE CONTROL ROUTe:ADVance Turns the scanner Advanced mode on/off. Parameter: ON|OFF Example: ROUT:ADV OFF Turns advanced scanner mode off. ROUTe:ADVance? Returns the advanced mode status (on/off). Return parameter: (0|1) (0=OFF, 1=ON) ROUTe:SCAN:COUNt? Returns the current scan count number. Return parameter: (1~999) ROUTe:SCAN:FINal Configures the DMM to send a “SCAN OK” message at the completion of the scan.
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GDM-8261 User Manual FETCh? Transfer the stored readings to the output buffer. DATA:POINts? Returns the number of readings.
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FAQ FAQ ● What is the Output key used for? ● I pressed the EXIT key but cannot get out of Scanner mode. ● The GDM-8261 performance does not match the specifications. What is the Output key used for? The Output key is used for turning the display output on or off as well as locking the front panel keys on/off. I pressed the EXIT key but cannot get out of Scanner mode. Press the Exit key, followed by the ACV (Scan) or DCV (Step) key. The GDM-8261 performance does not match the specificatio ns.
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GDM-8261 User Manual APPENDIX System Info Firmware Version ................................................. 207 Fuse Replacement Replace AC Source Fuse ....................................... 208 Menu Tree Menu Tree ............................................................ 210 Specifications General ................................................................ 212 Replace Input Current Fuse .................................. 209 DC Characteristics [1] .....................................
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APPENDIX Firmware Version Background Firmware version is available from the system menu. Firmware version View firmware version Shows the GDM-8261firmware version number. 1. Press the Shift key followed by the 2nd (Menu) key. The system menu appears. SHIFT / EXIT MENU 2ND 2. Press the Down key followed by the Right key. The firmware version menu appears. TRIG 3. Press the Down key. The firmware version appears. 4. Press the Exit key to go back to the default display.
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GDM-8261 User Manual Fuse Replacement Replace AC Source Fuse Steps 1. Take off the power cord and remove the fuse socket using a minus driver. 240 220 1 0 0 120 120 220 220 240 100 120 240 2. Replace the fuse in the holder. 100 220 220 120 120 100 208 100 Rating 240 240 3. Ensure the correct line voltage is lined up with the arrow on the fuse holder. Insert the fuse socket. 0.315AT, 100/120VAC; 0.
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APPENDIX Replace Input Current Fuse Step 1. Press the Fuse holder. 2. The fuse holder comes out. Replace the fuse inserted at the end of the holder. Rating T1.
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GDM-8261 User Manual Menu Tree Menu Tree The menu tree diagram shown on the next page represents the configuration menu that is accessed by pressing the Shift key and 2ND (Menu) key. The menu tree is arranged as a three-level tree structure. Background Menu Tree Navigation HOLD TRIG Navigate between menus HOLD TRIG AUTO SHIFT / EXIT ENTER Switch between level 1 and level 2 Access Level 2 menu item Continued next page.
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APPENDIX Configuration Menu Tree SHIFT/ EXIT MENU 2ND LEVEL 1 SYSTEM MEAS SET ADC HZ/P I/O SET LAN TX/TERM LEVEL 2 SIMPLE ADVAN MONITOR MIN CH MAX CH TIMER COUNT MIN CH MAX CH TIMER COUNT CH 01 : CH 18 EOL SEP FORMAT CR+LF CR LF EOL COMMA V V+U+C V+C V+U RESET DHCP IP SUBNET GATEWAY YES NO ON OFF IP.1 XXX : IP.4 XXX S1. XXX : S4. XXX G1. XXX : G4. XXX DNS MAC TELNET INIT WEB PW D1. XXX : D4.
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GDM-8261 User Manual Specifications General   Note  Power Supply Power Line Frequency Operating Environment Storage Environment Power Consumption Dimensions Weight 212 All specifications are ensured only under a single display. At least 1 hour of warm-up time is required before applying these specifications. (Auto-Zero on, Auto-Gain on, Slow mode) Make sure the power ground is connected.
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APPENDIX DC Characteristics [1] DC Voltage 24 Hour [2] 90 Day 1 Year Range 23˚C±1˚C 23˚C±5˚C 23˚C±5˚C 100.0000 mV 0.0030 + 0.0030 0.0040 + 0.0035 0.0050 + 0.0035 1.000000 V 0.0015 + 0.0004 0.0020 + 0.0005 0.0035 + 0.0005 10.00000 V 0.0020 + 0.0006 0.0030 + 0.0007 0.0040 + 0.0007 100.0000 V 0.0020 + 0.0006 0.0035 + 0.0006 0.0045 + 0.0006 1000.000 V 0.0020 + 0.0006 0.0035 + 0.0010 0.0045 + 0.0010 Accuracy Specifications: ± ( % of reading + % of range ) [3] Resistance Temperature Coefficient/˚C [6] 0.
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GDM-8261 User Manual Measuring Characteristics DC Voltage Input Resistance Range 0.1V 1V 10V 100V 1000V 30pA (Typ, 25°C) Input Bias Input Protection 1000V on all ranges Measurement Method: Sigma-delta A/D Converter Resistance 10MΩ or >10GΩ Selectable 10MΩ or >10GΩ Selectable 11.11MΩ ±1% 10.1MΩ±1% 10.1MΩ±1% Max. Lead 10% of range per lead for 100Ω, 1 kΩ ranges. 1 kΩ per lead on all other ranges. Resistance Input Protection 1000 V on all ranges Measurement Method: Selectable 4-wire or 2-wire ohms.
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APPENDIX will create some variation in the voltage drop across a diode junction. [ 6 ] 0˚C~18˚C, 28˚C~55˚C [ 7 ] When making 4W resistance measurements please note the following: Due to the Seebeck effect, please insert the banana plugs of the 4W test cables into the dedicated female terminals on the GDM-8261 and wait for the terminals and banana plugs to reach an equilibrium temperature. AC Characteristics True RMS AC Voltage Range [3] 100.
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GDM-8261 User Manual 10.00000 mA 100.0000 mA 1.000000 A 10.00000 A 3Hz – 5Hz 1.1 + 0.06 1.1 + 0.06 5Hz – 10Hz 0.35 + 0.06 0.35 + 0.06 0.35+0.06 0.1+0.006 10Hz – 5kHz 0.15 + 0.06 0.15 + 0.06 0.15+0.06 0.015+0.006 5kHz – 10kHz 0.35 + 0.7 0.35 + 0.7 0.35+0.7 0.03+0.006 3Hz – 5Hz 1.0 + 0.04 1.0 + 0.04 1.0+0.04 0.1+0.006 5Hz – 10Hz 0.3 + 0.04 0.3 + 0.04 0.3+0.04 0.035+0.006 10Hz – 5kHz 0.1 + 0.04 0.1 + 0.04 0.1+0.04 0.015+0.006 5kHz – 10kHz 0.2 + 0.25 0.2 + 0.25 0.2+0.25 0.
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APPENDIX Measuring Characteristics True RMS AC Voltage AC Filter Bandwidth True RMS AC Current Measurement Method: Crest Factor Slow Medium Fast Input Impedance: Input Protection: Range 1mA 10mA 100mA 1A 10A Input Protection: Operating Characteristics AC-coupled True RMS – measures the ac component of input with up to 400 Vdc of bias on any range.
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GDM-8261 User Manual Frequency and Period Characteristics Frequency Period Range 100 mV to 750 V [4] [2] [3] Frequency 3Hz - 5Hz 24 Hour [1] 23˚C±1˚C 0.1 90 Day 23˚C±5˚C 0.1 1 Year 23˚C±5˚C 0.1 Temperature Coefficient/˚C [5] 0.005 5Hz - 10Hz 0.05 0.05 0.05 0.005 10Hz - 40Hz 0.03 0.03 0.03 0.001 0.01 0.01 0.001 40Hz - 300kHz 0.
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APPENDIX Temperature Characteristics (Display in °C, °F, Exclusive of probe errors.) RTD (Accuracy based on PT100): (100Ω platinum [PT100], D100, F100,PT385, PT3916, or user type) [1] Temperature Coefficient Range Resolution 1 Year (23°C ±5°C) 0°-18°C & 28°-55°C -200°C~ -100°C 0.001°C 0.09°C 0.004 °C / °C -100°C~-20°C 0.001°C 0.08°C 0.005 °C / °C -20°C~20°C 0.001°C 0.06°C 0.005 °C / °C 20°C~100 °C 0.001°C 0.08°C 0.005 °C / °C 100°C~300 °C 0.001°C 0.12°C 0.007 °C / °C 300°C~600 °C 0.001°C 0.22°C 0.
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GDM-8261 User Manual 107 Dimensions 264.4 88 350.3 220 325.1 88 19 19 220 72 76.8 57 M4 X 0.7 4 Places 10 5 8.4 309.1 16 5.3 10.7 The cave depth 2.5mm 15.7 19 All dimensions are shown in millimeters. 201.
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APPENDIX EC Declaration of Conformity We GOOD WILL INSTRUMENT CO., LTD. (1) No.7-1, Jhongsing Rd., Tucheng Dist., New Taipei City, Taiwan (R.O.C.) (2) No.
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GDM-8261 User Manual INDEX A AC bandwidth scanner configuration ............................. 103 setting ........................................................ 32 Current auto-detect input port setting ...................................... 86 setting ........................................................ 84 ADC speed setting ........................................................ 90 Auto-gain setting ........................................................ 89 Auto-zero setting ....................
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INDEX IP 143 MAC address ........................................... 149 Reset ........................................................ 141 Subnet ...................................................... 145 Telnet........................................................ 150 Web password ......................................... 153 Ethernet installation ..................................... 138 F Math 1/X ............................................................. 70 MX+B ..................................
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GDM-8261 User Manual command set ........................................... 201 get out of scanner mode ......................... 205 installation ............................................... 102 Overview .................................................. 110 run scan ................................................... 117 simple settings......................................... 111 step operation .......................................... 117 triggering .................................................