Keysight U3402A 5 1/2 Digit Dual Display Multimeter User’s and Service Guide
Notices © Keysight Technologies 2009 - 2015 Warranty No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies as governed by United States and international copyright laws. The material contained in this document is provided “as is,” and is subject to being changed, without notice, in future editions.
Safety Symbols The following symbol on the instrument and in the documentation indicates precautions that must be taken to maintain safe operation of the instrument.
Regulatory Markings The CE mark is a registered trademark of the European Community. This CE mark shows that the product complies with all the relevant European Legal Directives. The C-tick mark is a registered trademark of the Spectrum Management Agency of Australia. This signifies compliance with the Australia EMC Framework regulations under the terms of the Radio Communication Act of 1992. ICES/NMB-001 indicates that this ISM device complies with the Canadian ICES-001.
General Safety Information The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.
CAUTION • Turn off circuit power and discharge all high-voltage capacitors in the circuit before you perform resistance, continuity, or diode tests. • Use the correct terminals, functions, and range for your instrument. • Do not measure voltage when current measurement is selected. • Use the instrument with the cables provided. • Repair or service that is not covered in this manual should only be performed by qualified personnels.
Environmental Conditions This instrument is designed for indoor use and in an area with low condensation. The table below shows the general environmental requirements for the instrument. NOTE Requirements Operating temperature Full accuracy from 0 °C to 50°C (Operating) Operating humidity Full accuracy up to 80 % R.H.
Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC This instruction complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed product label indicates that you must not discard this electrical/electronic product in domestic household waste. Product Category: With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument” product.
Declaration of Conformity (DoC) The Declaration of Conformity (DoC) for this instrument is available on the Web site. You can search the DoC by its product model or description. http://regulations.products.keysight.com/DoC/search.htm NOTE X If you are unable to search for the respective DoC, please contact your local Keysight representative.
In This Guide ... 1 Getting Started Tutorial This chapter provides an introduction to the U3402A digital multimeter and a tutorial showing how to use the front panel in order to make measurements. 2 Operations and Features This chapter explains the various functions and features available to the U3402A digital multimeter. 3 Application Tutorial This chapter describes the advanced features and the possible applications for effective operation of the multimeter.
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
Contents 1 Getting Started Tutorial Introducing the Keysight U3402A Dual Display Multimeter Checking the shipping contents 3 Connecting power to the multimeter 4 Stacking the U3402A 5 Adjusting the Handle 6 2 Product at a Glance 7 Product dimensions 7 The front panel at a glance 8 The display at a glance 9 The keypad at a glance 11 The terminals at a glance 14 The rear panel at a glance 16 Making Measurements 17 Performing voltage measurements 18 Performing current measurements 20 Performing frequency
Hold 40 Combination of Math Operations Using the Secondary Display 41 43 Using the Setup Menu 45 Changing the Configurable Settings 3 46 Application Tutorial Applications for Using Dual Display 52 Dual Display Operation Examples 53 Measure DC Voltage and AC Ripple on a Rectification Circuit 53 Measure AC and DC Current on a Rectification Circuit 54 Measure AC Voltage and Frequency on an AC Circuit 55 Measure DC Voltage and DC Current on a Transistor Circuit or Load Measure Resistance Using 2-Wire
Cleaning 78 To Replace the Power Line Fuse 79 To Replace a Current Input Fuse 80 Electrostatic Discharge (ESD) Precautions Mechanical Disassembly 81 Replaceable Parts 87 To order replaceable parts 6 80 87 Specifications and Characteristics DC Specifications 90 AC Specifications 93 Decibel (dB) Calculation 97 Supplemental Measurement Specifications Display update rate 98 Measurement specifications 98 Reading rates 105 General Characteristics 98 107 To Calculate Total Measurement Error 109 Accu
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
List of Tables Table 1-1 Table 1-2 Table 1-3 Table 1-4 Table 1-5 Table 2-1 Table 2-2 Table 2-3 Table 2-4 Table 3-1 Table 4-1 Table 4-2 Table 4-3 Table 4-4 Table 4-5 Table 4-6 Table 4-7 Table 4-8 Table 4-9 Table 5-1 Table 5-2 Table 6-1 Table 6-2 Table 6-3 Table 6-4 Table 6-5 Table 6-6 Table 6-7 Table 6-8 Table 6-9 U3402A User’s and Service Guide Display annunciators 9 Keypad functions 11 Input terminal for different measurement functions 15 Range scale value in slow, medium, and fast reading rate 31 Readi
Table 6-10 Reading rates for single display (readings/second (approx)) 105 Table 6-11 Reading rates for the dual display (readings/second (approx)) 106 Table 6-12 General characteristics 107 XVIII U3402A User’s and Service Guide
List of Figures Figure 1-1 Figure 1-2 Figure 1-3 Figure 1-4 Figure 1-5 Figure 1-6 Figure 1-7 Figure 1-8 Figure 1-9 Figure 1-10 Figure 1-11 Figure 1-12 Figure 1-13 Figure 1-14 Figure 1-15 Figure 1-16 Figure 1-17 Figure 1-18 Figure 1-19 Figure 1-20 Figure 2-1 Figure 2-2 Figure 2-3 Figure 2-4 Figure 2-5 Figure 2-6 Figure 2-7 Figure 2-8 Figure 3-1 Figure 3-2 Figure 3-3 U3402A User’s and Service Guide Stacking the U3402A 5 Type of handle position 6 Attaching and detaching the handle.
Figure 3-4 Terminal connection when measuring DC voltage and DC current on a transistor circuit or load 57 Figure 3-5 Terminal connection when measuring resistance using 2-wire mode 58 Figure 3-6 Terminal connection when measuring resistance using 4-wire mode 59 XX U3402A User’s and Service Guide
U3402A 5 1/2 Digit Dual Display Multimeter User’s and Service Guide 1 Getting Started Tutorial Introducing the Keysight U3402A Dual Display Multimeter 2 Checking the shipping contents 3 Connecting power to the multimeter 4 Stacking the U3402A 5 Adjusting the Handle 6 Product at a Glance 7 Product dimensions 7 The front panel at a glance 8 The display at a glance 9 The keypad at a glance 11 The terminals at a glance 14 The rear panel at a glance 16 Making Measurements 17 Performing voltage measurements 18 P
1 Getting Started Tutorial Introducing the Keysight U3402A Dual Display Multimeter The key features of the U3402A dual display multimeter are: • 5 ½–digit dual display measurement • Eleven measurement functions: • AC voltage • DC voltage • AC + DC voltage • AC current • DC current • AC+DC current • 2- wire resistance • 4- wire resistance • Frequency • Continuity test • Diode test • Five math operations: • dBm • Min/Max • Relative (Rel) • Compare (Comp) • Hold • True RMS measurement for both AC+DC votage a
Getting Started Tutorial 1 Checking the shipping contents Verify that you have received the following items with your multimeter: • Power cord • Standard test lead kit • Quick start guide • Product reference CD • Test report • Certificate of calibration Inspect the shipping container for damage. Signs of damage may include a dented or torn shipping container or cushioning material that shows signs of unusual stress or compacting.
1 Getting Started Tutorial correspondence, refer to the multimeter by model number and serial number. Connecting power to the multimeter Connect the power cord and press the power switch to turn on the multimeter. The front panel display illuminates while the multimeter performs its power- on self- test. (If the multimeter does not power- on, refer to the “Operating Checklist” on page 76). During the power- on session, press to hold the full display. Press any key to resume the power- on self- test.
Getting Started Tutorial 1 Stacking the U3402A The U3402A is shipped with specially designed anti- slip protective bumpers on the front panel and rear panel. The multimeters will not slide off when stacked on top of each other. To be able to stack the U3402A multimeters, ensure the attached bumpers are in correct orientation. Refer to Figure 1- 1.
1 Getting Started Tutorial Adjusting the Handle To adjust the handle, grasp the handle by the side and pull outward. Then, rotate the handle to the desired position. Figure 1- 2 below shows the possible handle positions. Carrying position Benchtop position Handle removal position Figure 1-2 Type of handle position To attach or detach the handle, rotate the handle upright and pull it out from the sides of the multimeter. Refer to Figure 1- 3. Figure 1-3 Attaching and detaching the handle.
Getting Started Tutorial 1 Product at a Glance Product dimensions Front view 226.0 mm Side view 105.0 mm 305.
1 Getting Started Tutorial The front panel at a glance Primary display Input terminals and current fuse Measurement function keypads Autoranging, manual range and comparator operation Secondary display Math operation keypads Shift Power on/off switch Figure 1-5 Front panel 8 U3402A User’s and Service Guide
Getting Started Tutorial 1 The display at a glance Figure 1-6 VFD full display with all segments illuminated. The highly visible vacuum fluorescent display (VFD) annunciator are described in Table 1- 1. Table 1-1 Display annunciators Annunciator Description Primary display S Reading rate: Slow M Reading rate: Medium F Reading rate: Fast PEAK Peak measurement. Not applicable for the U3402A.
1 Getting Started Tutorial Table 1-1 Display annunciators Annunciator Description ºC Celcius temperature unit. Not applicable for the U3402A. ºF Fahrenheit temperature unit. Not applicable for the U3402A. mV Voltage unit: mV, V µmA Current unit: µA, mA, A µmnF Capacitance unit: nF, µF, mF. Not applicable for the U3402A.
Getting Started Tutorial 1 The keypad at a glance The operation for each key is shown in Table 1- 2. Pressing a key changes the current key operation, illuminates the related symbol on the display and emits a beep. Figure 1-7 Keypad Table 1-2 Keypad functions Key Description System related operation Press to power-on or power-off the U3402A multimeter. Press to select Shift. Press to return the multimeter to front panel operation when it is in remote state. + Press to step through the Setup menu.
1 Getting Started Tutorial Table 1-2 Keypad functions Key Description Measurement related operation Press to select the DC voltage measurement. Press to select the AC voltage measurement. Press to select the DC current measurement. Press to select the AC current measurement. + Press to select the AC+DC voltage measurement. + Press to select the AC+DC current measurement. Press to toggle between the 2-wire resistance or 4-wire resistance measurement. Press to select the frequency measurement.
Getting Started Tutorial 1 Table 1-2 Keypad functions Key Description + + + Press to select compare math operation. Press to select and set the high limit for compare math operation. Press to select and set the low limit for compare math operation. Press to enable Hold math operation. See “Hold” on page 40 for more information. + Press to select the reference impedance for dBm measurement. Press to enable the MinMax math operation. + Press to select the reading rate.
1 Getting Started Tutorial The terminals at a glance CAUTION To avoid damaging this multimeter, do not exceed the rated input limit. Figure 1-8 Input terminal NOTE 14 Voltages above 300 VAC may be measured only in circuits that are isolated from mains. However, transient overvoltages are also present on circuits that are isolated from mains. The Keysight U3402A is designed to safely withstand occasional transient overvoltages up to 2500 V PEAK.
Getting Started Tutorial 1 Table 1-3 Input terminal for different measurement functions Measurement function Input terminal Overload protection DC voltage (VDC) AC voltage (VAC), frequency (Hz) Miliampere (mA), frequency (Hz) 1000 VDC 750 VAC RMS, 1100 V PEAK, 2x107 V-Hz normal mode, or 1x106 V-Hz common mode V W Hz (Hi) mA 1200 mADC or AC RMS Lo 12A, frequency (Hz) 2-wire resistance (W (2W)) Diode test, continuity test 4-wire resistance (W (4W)) All functions U3402A User’s and Service Guide 12A
1 Getting Started Tutorial The rear panel at a glance AC line voltage selector AC power connector AC line fuse Line voltage fuse selection table Chassis ground lug RS232 interface connector (For calibration use only) Figure 1-9 Rear panel 16 U3402A User’s and Service Guide
Getting Started Tutorial 1 Making Measurements The following pages show you how to make measurement connections and how to select measurement functions from the front panel for each of the measurement functions. NOTE • After measuring a high voltage measurement of up to 1000 VDC, you are recommended to wait for approximate two minutes before measuring a low-level measurement with 1 to 10 µV resolutions.
1 Getting Started Tutorial Performing voltage measurements WA R N I N G Exceeding the crest factor limit may result in an incorrect or a lower reading. Do not exceed the crest factor limit to avoid instrument damage and the risk of electric shock. CAUTION Ensure that the terminal connections are connected correctly before making any measurement. To avoid damaging the multimeter, do not exceed the rated input limit. AC voltage: • Five ranges: • Slow reading rate: 120.000 mV, 1.20000 V, 12.0000 V, 120.
Getting Started Tutorial 1 DC voltage: • Five ranges: • Slow reading rate: 120.000 mV, 1.20000 V, 12.0000 V, 120.000 V, 1000.00 V. • Medium reading rate: 400.00 mV, 4.0000 V, 40.000 V, 400.00 V, 1000.0 V. • Fast reading rate: 400.0 mV, 4.000 V, 40.00 V, 400.0 V, 1000 V. • Measurement method: Sigma Delta A-to-D converter • Input impedance: 10 MW ± 2% range (typical) • Input protection: 1000 V on all ranges 1 Press .
1 Getting Started Tutorial Performing current measurements Measuring AC (RMS) or DC Current in mA • Three AC current or DC current ranges: • Slow reading rate: 12.0000 mA, 120.000 mA, 1.20000 A • Medium reading rate: 40.000 mA, 120.00 mA, 1.2000 A • Fast reading rate: 40.00 mA, 120.0 mA, 1.200 A • Shunt resistance: 0.1 W to 10 W for 12 mA to 1.2 A range • Input protection: Front panel 1.25 A, 500 V FH fuse for one terminal 1 Press or . 2 Power off the measured circuit.
Getting Started Tutorial 1 Measuring AC (RMS) or DC Current up to 12 A • One range: • 12.0000A for DC or AC RMS continuous • 12.0000 ADC or AC RMS for maximum 30 seconds • Shunt resistance: 0.01 W for 12 A range • Input protection: Internal 15 A, 600 V fuse for 12A terminal 1 Press or . 2 Power off the measured circuit. 3 Connect the red and black test leads to the A input terminal as shown in Figure 1- 13. 4 Probe the test points in series with the circuit.
1 Getting Started Tutorial Performing frequency measurements WA R N I N G Use the frequency counter for low voltage applications. Do not use the frequency counter on AC power line systems. Measuring frequency • Five ranges: 120.000 mV, 1.20000 V, 12.0000 V, 120.000 V, 750.00 V — range is based on the voltage level of the signal, not frequency • Measurement method: Reciprocal counting technique • Signal level: 10% of range to full scale input on all ranges • Gate time: 0.
Getting Started Tutorial 1 Performing resistance measurements CAUTION Disconnect circuit power and discharge all high-voltage capacitors before measuring resistance to avoid damaging the multimeter or the device under test. Measuring resistance • Seven ranges: • Slow reading rate: 120 .000 W, 1.20000 kW, 12.0000 kW, 120.000 kW, 1.20000 MW, 12.0000 MW, 120.000 MW • Medium reading rate: 400 .00 W, 4.0000 kW, 40.000 kW, 400.00 kW, 4.0000 MW, 40.000 MW, 300.00 MW • Fast reading rate: 400 .0 W, 4.000 kW, 40.
1 Getting Started Tutorial Test current + Resistance – Figure 1-15 2-wire W terminal connection and display Test current + Resistance – Figure 1-16 4-wire W terminal connection and display 24 U3402A User’s and Service Guide
Getting Started Tutorial 1 Performing diode/continuity test Testing diodes The diode test measures the forward voltage of a semiconductor junction of approximately 0.5 mA. The beeper will emit a single beep tone when the input voltage is below +0.7 V (approximately 1.4 kW) and emits a continuous beep tone when the input voltage is below 50 mV (approximately 100 W). Measurements are displayed as shown below: NOTE Reading rate Measurement display Slow Medium 1.2 V range 2.5 V range Fast 4.
1 Getting Started Tutorial To test a diode, switch the circuit power off, and remove the diode from the circuit. Then proceed as follows: 1 Press . The default function is diode measurement. 2 Connect the red and black test leads to the input terminal as shown in Figure 1- 17. 3 Connect the red test lead to the positive terminal (anode) of the diode and the black test lead to the negative terminal (cathode). Refer to Figure 1- 17. NOTE The cathode of a diode is indicated with a band.
Getting Started Tutorial 1 Test current + Forward bias – Figure 1-17 Forward-biased diode/continuity test terminal connection and display Test current Reverse bias + – Figure 1-18 Reverse-biased diode/continuity terminal connection and display U3402A User’s and Service Guide 27
1 Getting Started Tutorial Testing Continuity The continuity test measures the resistance of a tested circuit with 2- wire method at approximately 0.5 mA and determines whether the circuit is intact. The beeper emits a continuous beep tone when the input resistance value is less than the approximate 10 W. Measurement are displayed as shown below: CAUTION Reading rate Measurement display Slow 120.000 W range Medium 400.00 W range Fast 400.
Getting Started Tutorial 1 Test current + Resistance – Figure 1-19 2-wire/continuity test terminal connection and display U3402A User’s and Service Guide 29
1 Getting Started Tutorial Selecting a Range You can allow the multimeter to select the range automatically by using autoranging, or you can select a fixed range using manual ranging. Auto- ranging is convenient because the multimeter automatically selects the appropriate range for sensing and displaying each measurement. However, manual ranging results in better performance, since the multimeter does not have to determine which range to use for each measurement.
Getting Started Tutorial 1 • Autorange thresholds — The multimeter shifts ranges as follows: • Down range at < 5% of current range • Up range at > full scale of current range • Table 1- 4 shows the summary of range values for slow, medium, and fast reading rate respectively. NOTE Autoranging is not applicable for current measurement up to 12 A. You are required to select the range manually when a signal is applied to the A terminal.
1 Getting Started Tutorial Setting the Reading Rate You can select three reading rates for the AC and DC voltage, AC and DC current, and resistance measurement which are Slow (S), Medium (M), and Fast (F) The selected rate allows you to maximize either the measurement speed or noise rejection, which affects the measurement accuracy. Refer to Table 1- 5.
U3402A 5 1/2 Digit Dual Display Multimeter User’s and Service Guide 2 Operations and Features Operating Math Operations 34 dBm 35 Rel 36 MinMax 37 Comp 39 Hold 40 Combination of Math Operations 41 Using the Secondary Display 43 Using the Setup Menu 45 Changing the Configurable Settings 46 This chapter explains the various functions and features available to the U3402A digital multimeter
2 Operations and Features Operating Math Operations Table 2- 1 presents a summary of the math operations that can be used with each measurement function. Table 2-1 Math operations for different measurement functions Measurement functions Allowed math operations dBm Rel Min Max Comp Hold DCV DCI Resistance — — ACV ACI Frequency Diode/Continuity — — — • All math operations can be toggled on and off by reselecting the same math operation. • Only one math operation can be turned- on at a time.
Operations and Features 2 dBm The logarithmic dBm (decibels relative to one milliwatt) scale is often used in RF signal measurements. The multimeter’s dBm operation takes a measurement and calculates the power delivered to a reference impedance (typically 50, 75, or 600 W). The formula used for conversion from the voltage reading is: dBm = 10 x Log10 [ 1000 x (Reading2 / reference impedance)] Figure 2-1 Typical dBm operation display The default reference impedance value is 600 W.
2 Operations and Features Procedure 2 1 Press . The reference impedance currently used will be displayed on the secondary display. 2 Use 3 Press 4 Press and to select the desired reference impedance. to store the selected value. to enable the dBm operation and read the display. Rel When making Rel (relative) measurements, each reading is the difference between a stored relative value and the input signal.
Operations and Features 2 Procedure 1 Press to enable Rel operation. 2 Press 3 Use NOTE to toggle in (and out) the Rel #. , , , and to modify the Rel #. 4 Press to set the Rel # and read the display. 5 Press to disable the Rel operation. • In resistance measurement mode, the multimeter will read a non-zero value even when the two test leads are in direct contact, because of the resistance of these leads. Use the Rel operation to zero-adjust the display.
2 Operations and Features Figure 2-4 Typical Min operation display Each time a new minimum or maximum value is stored, the multimeter beeps once (if the beeper is enabled) and briefly turns on the appropriate MAX or MIN annunciator.
Operations and Features 2 Comp The Comp (compare) operation allows you to perform pass/fail testing against specified upper and lower limits. You can set the upper and lower limits to any value between 0 and \100% of the highest range for the present function. Figure 2-5 Typical Comp operation display When enabled, the actual readings are shown in primary display and the comparison results such as HI, LO, or PASS is shown in secondary display.
2 Operations and Features 3 Press to store the specified value. 4 Press to enter the lower limit setup mode. The lower limit is shown on primary display while the LO annunciator is shown on secondary display. 5 Use 6 Press , , , and to modify the lower limit. to store the specified value. 7 Press to enable the Comp operation. 8 Press to disable the Comp operation or exit. Hold The reading hold feature allows you to capture and hold a reading on the front panel display.
Operations and Features 2 Combination of Math Operations NOTE The math operation can be operated for primary display only. The Keysight U3402A multimeter allows you to use multiple math operation such as dBm, MinMax, Rel, Hold, and Comp simultaneously. Example: Set upper and lower limit for Comp operation using multiple math operation as below: 1 Press to enable dBm operation. 2 Press to take dBm readings as Rel # for new measurement. 3 Press to record the Max value as the new Rel # (upper limit).
2 Operations and Features Table 2-2 Descriptions for combined math operations No. Math operation sequence Description Readings 1 dBm Reading is calculated to a dBm operation “A” 2 Rel dBm reading, “A” is taken as Rel # “B” 3 Min Min reading of relative dB is recorded as a new Rel #, “B” “C” 4 Max Max reading of relative dB is recorded as a new Rel #, “B” “D” 5 Comp Compare operation is performed based on the readings of “C” and “D” “E” 1. Press 2. Press 3. Press 4. Press 5.
Operations and Features 2 Using the Secondary Display To enable the secondary display mode: 1 Press followed by a specified function keys such as , , or , , to enable the secondary display mode. The 2ND annunciator is displayed along with the secondary display. Secondary display 2ND annunciator Figure 2-8 Secondary display To disable the secondary display mode: 1 Press . Table 2- 3 details the available input combinations for both primary and secondary display when dual display mode is selected.
2 Operations and Features Table 2-3 Description for dual display combination Primary display Secondary display DCV DCV ACV DCI [4] DCI [4] ACV [1] [1] [1] [1] ACI [4] ACV + DCV [1] Frequency [7] Diode/Continuity Hz [7] [1] [1] [2] [1] [1] [2] [1] [1] [2] [2] [2] [1] ACI + DCI [4] Resistance [3] ACI [4] [5] [5] [5] [5] [5] [5] dBm [6] Notes: 1 The range for both primary and secondary display are corresponding to the higher range of two displays (autoranging mode, while the
Operations and Features 2 Using the Setup Menu The Setup menu allows you to customize a number of non- volatile instrument configurations. The content of the Setup menu are shown in Table 2- 4. Table 2-4 Setup menu and communication parameters First tier menu rS232 [1] Description RS232 interface parameters Second tier menu Description Default factory setting Available settings bAUd Baud rate for remote communication with a PC (remote control).
2 Operations and Features Changing the Configurable Settings The parameters in the Setup menu can be configured by using the following procedures: 1 Press to access to the Setup menu. 2 Use and tier menu. to select the desired configurable items in the first If you select bEEP, a Use and b Press to confirm the selected parameter. c Press to quit from the Setup menu. to select the desired parameter. d The configuration settings is saved and main display is displayed.
U3402A 5 1/2 Digit Dual Display Multimeter User’s and Service Guide 3 Application Tutorial Applications for Using Dual Display 52 Dual Display Operation Examples 53 Measure DC Voltage and AC Ripple on a Rectification Circuit 53 Measure AC and DC Current on a Rectification Circuit 54 Measure AC Voltage and Frequency on an AC Circuit 55 Measure DC Voltage and DC Current on a Transistor Circuit or Load 56 Measure Resistance Using 2-Wire Mode 58 Measure Resistance Using 4-Wire Mode 59 Measure True RMS AC+DC 60
3 Application Tutorial Applications for Using Dual Display The dual display feature in the multimeter can be used to enhance test and measurement capabilities. See Table 3- 1 for the available combinations and application when using dual display. Table 3-1 Typical combinations and applications when using dual display 52 No.
Application Tutorial 3 Dual Display Operation Examples This section describes some practical operations when using dual display feature. Measure DC Voltage and AC Ripple on a Rectification Circuit A single measurement for both DC voltage and AC ripple can be displayed through both display while testing a rectifier circuit. 1 Connect the red and black test leads to the input terminal and probe the test points as shown in Figure 3- 1.
3 Application Tutorial 5 Press . Use and to select autoranging or manual ranging for the primary and secondary display. The ranging will be the same for both displays. • Press NOTE to disable the secondary display. • Press to select the suitable range if DCV+ACV ripple is above the scale of the current range. Measure AC and DC Current on a Rectification Circuit A single measurement for both AC current and DC current can be displayed through both display while testing a rectifier circuit.
Application Tutorial 2 Press to select AC current measurement for primary display. 3 Press . Use secondary display. 4 Press 5 Press NOTE Press 3 and to select autoranging or manual ranging for to enable the secondary display. The 2ND is displayed. to select DC current measurement for secondary display. to disable the secondary display.
3 Application Tutorial 3 Press . Use primary display. 4 Press 5 Press Press to select autoranging or manual ranging for to enable the secondary display. The 2ND is displayed. to select frequency measurement for secondary display. 6 Press . Use secondary display. NOTE and and to select autoranging or manual ranging for to disable the secondary display.
Application Tutorial 3 1 Connect the red and black test leads to the input terminal and probe the test points as shown in Figure 3- 4. + DC voltage source Load – Figure 3-4 Terminal connection when measuring DC voltage and DC current on a transistor circuit or load 2 Press to select DC voltage measurement for primary display. 3 Press . Use primary display. 4 Press 5 Press Press U3402A User’s and Service Guide to select autoranging or manual ranging for to enable the secondary display.
3 Application Tutorial Measure Resistance Using 2-Wire Mode WA R N I N G Do not apply voltage exceeding 500 V PEAK between V.W.Hz and Lo input terminals. 1 Connect the red and black test leads to the resistor and probe the test points as shown in Figure 3- 5. + Resistance – Figure 3-5 Terminal connection when measuring resistance using 2-wire mode 2 Press to select the 2- wire W measurement for primary display. The 2W is displayed. 3 Press . Use primary display.
Application Tutorial 3 Measure Resistance Using 4-Wire Mode WA R N I N G Do not apply voltage exceeding 250 V PEAK between Sense Hi and Sense Lo terminals, and 500 V PEAK between V.W.Hz and Lo input terminals. 1 Connect the red and black test leads to the resistor and probe the test points as shown in Figure 3- 6. + Resistance – Figure 3-6 Terminal connection when measuring resistance using 4-wire mode 2 Press to select the 4- wire W measurement for primary display. The 4W is displayed. 3 Press .
3 Application Tutorial Measure True RMS AC+DC The multimeter can measure the true RMS value of the AC voltage and AC current. 1 Press and , or and simultaneously. The multimeter will measure the DC and AC signals alternatively, calculate and display the AC+DC (RMS) value using the equation below: AC+DC (RMS) = NOTE 60 DC2 + AC2 When AC+DC voltage measurement is selected, the DCV input impedance is paralleled with the AC coupled 1.1 MW AC divider.
U3402A 5 1/2 Digit Dual Display Multimeter User’s and Service Guide 4 Performance Test Calibration Overview 62 Keysight Technologies Calibration Services 62 Calibration Interval 62 Recommended Test Equipment 63 Test Considerations 64 Performance Verification Test Overview 65 Performance Verification Test 65 DC Voltage Verification Test 65 DC Current Verification Test 67 Resistance Verification Test 68 Diode Verification Test 71 Frequency Verification Test 71 AC Voltage Verification Test 72 AC Current Verif
4 Performance Test Calibration Overview NOTE Make sure you have read “Test Considerations” on page 64 before calibrating the multimeter. Keysight Technologies Calibration Services When your instrument is due for calibration, contact your local Keysight Service Center. The U3402A is supported on automated calibration systems at Keysight service centres only. Calibration Interval A one- year interval is adequate for most applications.
Performance Test 4 Recommended Test Equipment The test equipments recommended for the performance verification procedures are listed below. If the exact instrument is not available, substitute calibration standards of equivalent accuracy. A suggested alternate method would be to use the Keysight 3458A 8½ - digit digital multimeter to measure less accurate yet stable sources. The output value measured from the source can be entered into the instrument as the target calibration value.
4 Performance Test Test Considerations For optimum performance, all procedures should comply with the following recommendations: • Ensure that the calibration ambient temperature is stable and between 18 °C and 28 °C. Ideally the calibration should be performed at 23 °C ±1 °C. • Ensure ambient relative humidity is less than 80%. • Allow a one- hour warm- up period with a shorting plug connected to the Hi and Lo input terminals.
Performance Test 4 Performance Verification Test Overview Performance verification test is an extensive set of tests that are recommended as an acceptance test when you first received the instrument. Use the performance verification test to verify the measurement performance of the instrument. The performance verification test uses the instrument's specifications listed in Chapter 6, “Specifications and Characteristics”.
4 Performance Test Table 4-2 DC voltage verification test Function Reading rate Input Range Error from nominal one year DC voltage Slow 0.000 V 120 mV ±8 µV Medium Slow Medium CAUTION 66 0.00000 V 1.2 V ±50 µV 0.0000 V 12 V ±0.5 mV 0.000 V 120 V ±5 mV 0.00 V 1000 V ±50 mV 0.00 V 400 mV ±50 µV 0.0000 V 4V ±500 µV 0.000 V 40 V ±5 mV 0.00 V 400 V ±50 mV 0.0 V 1000 V ±0.5V 100.000 mV 120 mV ±0.02 mV 1.00000 V 1.2 V ±0.17 mV 10.0000 V 12 V ±1.7 mV 100.
Performance Test 4 DC Current Verification Test 1 Connect the calibrator to the front panel Hi and Lo input connectors. 2 Select each function and range in the order shown in Table 4- 3. Provide the input shown in Table 4- 3. 3 Make a measurement and observe the result. Compare measurement results to the appropriate test limits shown in Table 4- 3. (Be certain to allow for appropriate source settling when using the Fluke 5520A.
4 Performance Test Resistance Verification Test Configuration: 2- wire W 1 Select the resistance function. 2 Select each range in the order shown in Table 4- 4. Provide the resistance value indicated. Compare measurement results to the appropriate test limits shown in Table 4- 4. (Be certain to allow for appropriate source settling.) Table 4-4 2-wire W verification test Function Reading rate Input Range Error from nominal one year 2-wire W Slow 0.000 W 120 W ±8 mW [1] 0.00000 W 1.
Performance Test 4 Table 4-4 2-wire W verification test Function Reading rate Input Range Error from nominal one year 2-wire W Medium 360.00 W 400 W ±0.41 W [1] 3.6000 kW 4 kW ±3.2 W [1] 36.000 kW 40 kW ±25 W [1] 360.00 kW 400 kW ±250 W 3.6000 MW 4 MW ±5.7 kW 20.000 MW 40 MW ±303 kW 200.00 MW 300 MW ±10.05 MW Notes: 1 Specifications are for 2-wire ohms function using the Rel operation enabled to eliminate lead resistance.
4 Performance Test Table 4-5 4-wire W verification test Function Reading rate Input Range Error from nominal one year 4-wire W Medium 0.00 W 400 W ±50 mW [1] 0.0000 W 4 kW ±0.3 W 0.000 W 40 kW ±3 W 0.00 W 400 kW ±30 W 0.0000 W 4 MW ±0.3 kW 0.000 W 40 MW ±3 kW 0.00 W 300 MW ±50 kW 100.000 W 120 W ±58 mW [1] 1.00000 kW 1.2 kW ±0.55 W [1] 10.0000 kW 12 kW ±5.5 W 100.000 kW 120 kW ±55 W 1.00000 MW 1.2 MW ±0.55 kW 10.0000 MW 12 MW ±30.5 kW 100.000 MW 120 MW ±3.
Performance Test 4 Diode Verification Test Configuration: Diode 1 Connect the calibrator to the front panel Hi and Lo input terminals. 2 Select each function and range in the order shown in Table 4- 6. Provide the input shown in Table 4- 6. 3 Make a measurement and observe the result. Compare measurement results to the appropriate test limits shown in Table 4- 6. (Be certain to allow for appropriate source settling when using the Fluke 5520A.
4 Performance Test AC Voltage Verification Test Configuration: AC volts 1 Select the AC voltage function. 2 Select each range in the order shown in Table 4- 8. Provide the indicated input voltage and frequency. Compare measurement results to the appropriate test limits shown in Table 4- 8. (Be certain to allow for appropriate source settling.) Table 4-8 AC volts verification test Function Reading rate V RMS Input frequency Range AC voltage Slow 12.
Performance Test 4 AC Current Verification Test Configuration: AC current 1 Select the AC current function. 2 Select each range in the order shown in Table 4- 9. Provide the input current and frequency indicated. Compare measurement results to the appropriate test limits shown in Table 4- 9. (Be certain to allow for appropriate source settling.) Table 4-9 AC current verification test Function Reading rate Current Input frequency Range AC current Slow 1.
4 Performance Test THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
U3402A 5 1/2 Digit Dual Display Multimeter User’s and Service Guide 5 Disassembly and Repair Operating Checklist 76 Types of Service Available 77 Repackaging for Shipment 78 Cleaning 78 To Replace the Power Line Fuse 79 To Replace a Current Input Fuse 80 Electrostatic Discharge (ESD) Precautions 80 Mechanical Disassembly 81 Replaceable Parts 87 This chapter will help you troubleshoot a faulty multimeter.
5 Disassembly and Repair Operating Checklist Before returning your multimeter to Keysight for service or repair check the following items: Is the multimeter inoperative? q Verify the power line voltage setting. q Verify the power line fuse is installed. q Verify that the power cord is connected to the multimeter and to AC line power. q Verify the front panel power switch is depressed. See page 79. Is the multimeter’s current input inoperative? q Verify the current input fuse.
Disassembly and Repair 5 Types of Service Available If your instrument fails during the warranty period, Keysight Technologies will repair or replace it under the terms of your warranty. After your warranty expires, Keysight offers repair services at competitive prices. Extended Service Contracts Many Keysight products are available with optional service contracts that extend the covered period after the standard warranty expires.
5 Disassembly and Repair Repackaging for Shipment If the instrument is to be shipped to Keysight for service or repair, be sure to: • Attach a tag to the unit identifying the owner and indicating the required service or repair. Include the model number and full serial number. • Place the unit in its original container with appropriate packaging material for shipping. • Secure the container with strong tape or metal bands.
Disassembly and Repair 5 To Replace the Power Line Fuse The power line fuse is located within the multimeter’s fuse- holder assembly on the rear panel. The multimeter is shipped from the factory with a power- line fuse installed (according to country of destination). Refer to Table 5- 1. If you determine that the fuse is faulty, replace it with one of the same size and rating. Table 5-1 Type of supplied fuse (according to country of destination) Type of fuse (time-lag, low breaking fuse) 0.
5 Disassembly and Repair To Replace a Current Input Fuse Both the mA and the A current input terminals are fuse protected. The fuse for the mA input terminal is located on the front panel (see page 14). The fuse is a 1.25 A, 500 V fuse (refer to Table 5- 2). If you determine that the fuse is faulty, replace it with one of the same size and rating. The fuse for the A current input terminal is located inside the multimeter (see page 85) and requires partial disassembly of the multimeter.
Disassembly and Repair 5 Mechanical Disassembly For procedures in this manual, the following tools are required for disassembly: • T15 Torx driver • T20 Torx driver • #2 Pozi–drive screw driver WA R N I N G Shock hazard. Only service–trained personnel who are aware of the hazards involved should remove the instrument covers. To avoid electrical shock and personal injury, make sure to disconnect the power cord from the multimeter before removing the covers.
5 Disassembly and Repair 3 Remove the multimeter’s bumpers. Pull from a corner and stretch the bumpers off the multimeter. 4 Remove the rear bezel. Loosen the two captive screws in the rear bezel and remove the rear bezel.
Disassembly and Repair 5 5 Remove the cover. Remove the screw at the bottom of the cover and slide the cover off the multimeter. Front Panel Removal 1 Remove on/off switch push rod. Gently move the power switch push rod toward the front of the multimeter to disengage it from the switch. Be careful not to twist or bend the push rod.
5 Disassembly and Repair 2 Remove the screw holding the front panel. 3 Disconnect the two ribbon cable connectors from the front panel.
Disassembly and Repair 5 4 Disconnect the individual front panel wires shown below. 15 A current fuse 5 There is now enough play to allow the side of the front panel to be pried from the chassis and removed as an assembly.
5 Disassembly and Repair Front Panel Disassembly 1 Remove the keyboard and display assembly. Remove the two screws holding the circuit board. Lift the keyboard and display assembly from the plastic housing. a The rubber keypad can now be pulled from the plastic housing.
Disassembly and Repair 5 Replaceable Parts This section contains information for ordering replacement parts for your instrument. You can find the instrument support part list at Keysight’s Test & Measurement Parts Catalog at http://www.keysight.com/find/parts This parts list includes a brief description of each part with applicable Keysight part number. To order replaceable parts You can order replaceable parts from Keysight using the Keysight part number.
5 Disassembly and Repair THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
U3402A 5 1/2 Digit Dual Display Multimeter User’s and Service Guide 6 Specifications and Characteristics DC Specifications 90 AC Specifications 93 True RMS AC Voltage (AC Coupling Mode) 93 True RMS AC Voltage (AC+DC Coupling Mode) 94 True RMS AC Current (AC Coupling Mode) 95 True RMS AC Current (AC+DC Coupling Mode) 96 Frequency 96 Decibel (dB) Calculation 97 Supplemental Measurement Specifications 98 Display update rate 98 Measurement specifications 98 Reading rates 105 General Characteristics 107 To Calc
6 Specifications and Characteristics DC Specifications Table 6-1 DC resolution, full scale reading, and accuracy [±(% of reading + count)] Function Rate Slow Voltage Med Fast 90 Range Resolution Maximum reading Accuracy (One year; 23ºC ± 5ºC) Typical input Burden voltage [4] impedance [1] 120.000 mV 0.001 mV 119.999 ±0.012% + 8 [2] 10.0 MW 1.20000 V 0.00001 V 1.19999 ±0.012% + 5 10.0 MW 12.0000 V 0.0001 V 11.9999 ±0.012% + 5 11.1 MW 120.000 V 0.001 V 119.999 ±0.012% + 5 10.
Specifications and Characteristics 6 Table 6-1 DC resolution, full scale reading, and accuracy [±(% of reading + count)] (continued) Function Rate Slow Current Med Fast Slow Diode/ Continuity Resistance / Continuity (2-wire) Range Resolution Maximum reading Accuracy (One year; 23ºC ± 5ºC) 12.0000 mA 0.0001 mA 11.9999 0.05% + 15 [2] 120.000 mA 0.001 mA 119.999 0.05% + 5 1200.00 mA 0.01 mA 1199.99 0.2% + 5 Typical input Burden voltage [4] impedance [1] < 0.15 V — < 1.5 V < 0.3 V 12.
6 Specifications and Characteristics Table 6-1 DC resolution, full scale reading, and accuracy [±(% of reading + count)] (continued) Function Rate Range [6] 120.000 W Slow Resistance Med Fast Resolution 0.001 W Maximum reading 119.999 Current source Accuracy (One year; 23ºC ± 5ºC) 2-wire 0.5 mA 4-wire 0.1% + 8 [2] [2] 0.05% + 8 [2] 0.05% + 5 [2] 1.20000 kW 0.00001 kW 1.19999 0.5 mA 0.08% + 5 12.0000 kW 0.0001 kW 11.9999 100 µA 0.06% + 5 [2] 0.05% + 5 120.000 kW 0.001 kW 119.
Specifications and Characteristics 6 AC Specifications True RMS AC Voltage (AC Coupling Mode) Table 6-2 AC voltage resolution, full scale reading, and accuracy [± (% of reading + count)] Rate Slow Med Fast Accuracy (One year; 23ºC ± 5ºC) [1] Range Resolution Maximum reading 120.000 mV 0.001 mV 119.999 1% + 100 0.2% + 100 1.5% + 300 5% + 300 1.20000 V 0.00001 V 1.19999 1% + 100 0.2% + 100 1% + 100 3% + 200 12.0000 V 0.0001 V 11.9999 1% + 100 0.2% + 100 1% + 100 3% + 200 120.
6 Specifications and Characteristics True RMS AC Voltage (AC+DC Coupling Mode) Table 6-3 AC voltageac+dc resolution, full scale reading, and accuracy [± (% of reading + count)] Rate Slow Med Fast Accuracy (One year; 23ºC ± 5ºC) [2] Resolution Maximum reading 45 Hz to 10kHz 10 kHz to 30 kHz 30 kHz to 100 kHz 120.000 mV 0.001 mV 119.999 0.2% + 100 1.5% + 300 5% + 300 1.20000 V 0.00001 V 1.19999 0.2% + 100 1% + 100 3% + 200 12.0000 V 0.0001 V 11.9999 0.
Specifications and Characteristics 6 True RMS AC Current (AC Coupling Mode) Table 6-4 AC current resolution, full scale reading, burden voltage, and accuracy [± (% of reading + count)] Rate Slow Med Fast Maximum Burden voltage [1] reading Range Resolution 12.0000 mA 0.0001 mA 11.9999 < 0.15 V 120.000 mA 0.001 mA 119.999 < 1.5 V 1200.00 mA 0.01 mA 1199.99 12.0000 A 0.0001A 11.9999 40.000 mA 0.001 mA 120.00 mA 0.01 mA 1200.0 mA 12.
6 Specifications and Characteristics True RMS AC Current (AC+DC Coupling Mode) Table 6-5 AC current ac+dc resolution, full scale reading, burden voltage, and accuracy [± (% of reading + count)] Rate Slow Med Fast Range Resolution Maximum reading Burden voltage [1] Accuracy (one year; 23ºC ± 5ºC) [2] 45 Hz to 2 kHz 2 kHz to 10 kHz 12.0000 mA 0.0001 mA 11.9999 < 0.15 V 0.5% + 100 2% + 200 120.000 mA 0.001 mA 119.999 < 1.5 V 0.5% + 100 2% + 200 1200.00 mA 0.01 mA 1199.99 < 0.3 V 0.
Specifications and Characteristics 6 Decibel (dB) Calculation Table 6-7 Range and accuracy (±dB) Rate Slow Medium Voltage range [1][2] dBm [3] range at 600 W ref Accuracy (One year; 23ºC ± 5ºC) [1] 20 Hz to 45 Hz 45 Hz to 10 kHz 10 kHz to 100 kHz 120.000 mV 6 mV to 120 mV – 42.20 to – 16.20 1.0 0.2 1.0 1.20000 V 120 mV to 1.2 V – 16.20 to 3.80 0.8 0.1 0.8 12.0000 V 1.2 V to 12 V 3.80 to 23.80 0.8 0.1 0.8 120.000 V 12 V to 120 V 23.80 to 43.80 0.8 0.1 0.8 – 1000.
6 Specifications and Characteristics Supplemental Measurement Specifications Display update rate Table 6-8 Full scale display update rates Display update rates Display counts Slow 119,999 Medium 39,999 Fast 3,999 Measurement specifications Table 6-9 Supplemental measurement specifications DC voltage • Measurement method • Sigma Delta A-to-D converter • Input resistance • 10 MW ± 2% range (typical) • Maximum input voltage • 1000 VDC or PEAK AC on all ranges • Input protection • 1000 V on all ranges
Specifications and Characteristics 6 Table 6-9 Supplemental measurement specifications (continued) DC current • Shunt resistance • 0.1 W to 10 W for 12 mA to 1.2 A ranges • 0.01 W for 12 A range • Maximum input and overload protection • mA input terminal: 1200 mADC or AC RMS. Protected with 1.25 A/500 V, IEC-127 sheet, FB fuse • 12 A input terminal: 10 ADC or AC RMS continuous, or 12 ADC or AC RMS for 30 seconds maximum.
6 Specifications and Characteristics Table 6-9 Supplemental measurement specifications (continued) • Response time • Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the tested input signal at the same range.
Specifications and Characteristics 6 Table 6-9 Supplemental measurement specifications (continued) AC current (True RMS, AC Coupling Mode) • Measurement method • DC coupled to the fuse and current shunt, AC coupled true RMS measurement (measures the AC component only) • Crest factor • Maximum 3:0 at full scale • Shunt resistance • 0.1 W to 10 W for 10 mA to 1.2 A ranges • 0.01 W for 12 A range • Input protection • mA input terminal: 1200 mADC or AC RMS. Protected with 1.
6 Specifications and Characteristics Table 6-9 Supplemental measurement specifications (continued) Resistance (2-wire W and 4-wire W) • Measurement method • 2-wire Ohms or 4-wire Ohms • Open-circuit voltage • Limited to < +9 VDC • Zeroing error • 0.05 W or less (excluding test lead resistance) in each range when Rel operation is used • Input protection • 500 V on all ranges • Response time • • • • Approximately 1.
Specifications and Characteristics 6 Table 6-9 Supplemental measurement specifications (continued) • Audible tone • Continuous beep for continuity and single tone for normal forward-biased diode or semiconductor junction • Input protection • 500 V RMS on all ranges Resistance/continuity (2-wire W) • Measurement method • 2-wire Ohms • Test current • Approximately 0.
6 Specifications and Characteristics Table 6-9 Supplemental measurement specifications (continued) • Gate time • 0.1 second or 1 period of the input signal, whichever is longer • Input impedance • 1 MW ± 2% in parallel with <120 pF of all ranges • Maximum input voltage • 750 V RMS /1100 V PEAK • 2x107 V-Hz product on any range, normal mode input • 1x106 V-Hz product on any range, common mode input • Input protection • 750 V RMS on all ranges • Response time • Approximately 1.
Specifications and Characteristics 6 Table 6-9 Supplemental measurement specifications (continued) Math Operation • dBm, Rel, MinMax, Comp, Hold I/O Interface • RS232 [3] Notes: 1 Reference impedance is displayed on the secondary display. 2 Reading displayed in watts (Audio power). 3 For calibration use only. NOTE When Vac+dc measurement function is selected, the VDC input impedance is parallel with an AC-couples 1.1 MW divider.
6 Specifications and Characteristics Table 6-11 Reading rates for the dual display (readings/second (approx)) Measurement functions Slow Medium Fast DCV / ACV 0.8 1.1 1.6 DCA / ACA 0.5 0.7 0.9 DCV / DCA 0.7 1.1 1.6 DCV / ACA 0.1 0.4 0.5 ACV / ACA 0.1 0.4 0.5 ACV / DCA 0.8 1.1 1.6 ACV / Frequency [1] 1.0 1.7 2.3 ACA / Frequency [1] 1.2 1.7 2.5 ACV + DCV / DCV 0.7 1.1 1.6 ACA + DCA / DCV 0.1 0.3 0.4 ACA + DCA / ACV 0.1 0.3 0.4 ACA + DCA / DCA 0.5 0.7 0.
Specifications and Characteristics 6 General Characteristics Table 6-12 General characteristics Power Supply • 100 V/120 V/220 V/240 V ± 10% • AC line frequency 50 Hz to 60Hz Power Consumption • 16 VA maximum Input Power Option • Manual ranging (100 VAC to 240 VAC ±10%) Fuse • Terminal: • 1.25 A, 500 V FB fuse • 15 A, 600 V FB fuse (internal) • Power line (according to country of destination): • 0.
6 Specifications and Characteristics Table 6-12 General characteristics Storage Compliance • – 20 °C to 60 °C • Relative humidity at 5% to 90% RH (non-condensing) Safety Compliance • IEC 61010-1:2001/EN61010-1:2001 (2nd Edition) • Canada: CAN/CSA-C22.2 No.
Specifications and Characteristics 6 To Calculate Total Measurement Error The multimeter's accuracy specifications are expressed in the form of: (% of reading + count) In addition to the reading error and count error, you may need to add additional errors for certain operating conditions. Check the list below to make sure you include all measurement errors for a given function. Also, make sure you apply the conditions as described in the footnotes on the specification pages.
6 Specifications and Characteristics Accuracy Specifications Transfer Accuracy Transfer accuracy refers to the error introduced by the multimeter due to noise and short–term drift. This error becomes apparent when comparing two nearly- equal signals for the purpose of "transferring" the known accuracy of one device to the other. One-Year Accuracy These long–term accuracy specifications are valid at the calibration temperature (Tcal) ± 5 °C temperature range.
Specifications and Characteristics 6 Configuring for Highest Accuracy Measurements The measurement configurations shown below assume that the multimeter is in its power–on or reset state. It is also assumed that auto–ranging is enabled to ensure proper full scale range selection. • Select 5½ digits. • Null the test lead resistance for 2–wire ohms measurements, and to remove any interconnection offset for DC voltage measurements.
6 Specifications and Characteristics THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
www.keysight.
This information is subject to change without notice. © Keysight Technologies 2009 - 2015 Edition 9, March 20, 2015 *U3402-90001* U3402-90001 www.keysight.
