DMM4020 Digital Multimeter Users Manual 077-0364-00
Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material. Specifications and price change privileges reserved. TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
Warranty Tektronix warrants that the product will be free from defects in materials and workmanship for a period of three (3) years from the date of original purchase from an authorized Tektronix distributor. If the product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product. Batteries are excluded from this warranty.
Table of Contents Chapter 1 Title Page Introduction and Specifications......................................................... 1-1 General Safety Summary ................................................................................... To Avoid Fire or Personal Injury .............................................................. Symbols and Terms................................................................................... Safety and Electrical Symbols ..........................................
DMM4020 Users Manual Environment .................................................................................................. Triggering ...................................................................................................... Math Functions.............................................................................................. Electrical........................................................................................................ Remote Interfaces .......................
Contents (continued) Selecting a Function Modifier ........................................................................... Relative Readings Modifier (REL)................................................................ Decibels and Auto Power Modifier ............................................................... Touch Hold Function (HOLD) ...................................................................... Minimum / Maximum Modifier (MIN MAX) ..............................................
DMM4020 Users Manual RS-232 Remote / Local Configurations ........................................................ 4-27 RS-232 Save / Recall System Configurations ............................................... 4-27 Sample Program Using the RS-232 Computer Interface ................................... 4-27 Appendices A Applications ................................................................................................ A-1 B 2X4 Test Leads............................................................
List of Tables Table 1-1. 1-2. 1-3. 2-1. 2-2. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 4-14. 4-15. 4-16. 4-17. 4-18. Title Volatile Memory Space.......................................................................................... Non-volatile Memory Space .................................................................................. Accessories..................................................................................
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List of Figures Figure 1-1. 2-1. 2-2. 2-3. 2-4. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 4-1. 4-2. 4-3. 4-4. Title IEC 61010 Measurement Category (CAT) Levels................................................. Replacing the Line Power Fuse.............................................................................. Replacing the Current-Input Fuses......................................................................... Bail Adjustment and Removal .....................................
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Chapter 1 Introduction and Specifications Title General Safety Summary ..................................................................................... To Avoid Fire or Personal Injury ................................................................ Symbols and Terms..................................................................................... Safety and Electrical Symbols .................................................................... Description of IEC 61010 Measurement Categories......
DMM4020 Users Manual Math Functions................................................................................................ Electrical.......................................................................................................... Remote Interfaces ............................................................................................ Warranty .......................................................................................................... Electrical Specifications .........
Introduction and Specifications General Safety Summary 1 General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any other products connected to it. To avoid potential hazards, use this product only as specified. Only qualified personnel should perform service procedures. While using this product, you may need to access other parts of a larger system.
DMM4020 Users Manual Do Not Operate With Suspected Failures. If you suspect that there is damage to this product, have it inspected by qualified service personnel. Avoid Exposed Circuitry. Do not touch exposed connections and components when power is present. Use Proper Fuse. Use only the fuse type and rating specified for this product. Keep Product Surfaces Clean and Dry. XW Warning To avoid possible electric shock, personal injury, or death, read the following before using the Meter.
Introduction and Specifications General Safety Summary • Use caution when working with voltages above 30 V ac rms, 42 V ac peak, or 42 V dc. These voltages pose a shock hazard. • Use only the replacement fuse(s) specified by the manual. • Use the proper terminals, function, and range for your measurements. • Do not operate the Meter around explosive gas, vapor, or dust. • When using probes, keep your fingers behind the finger guards.
DMM4020 Users Manual Symbols and Terms The following terms and safety and electrical symbols may appear in the manual or on the product: A XW Warning statement identifies conditions or practices that could result in injury or death. A W Caution statement identifies conditions or practices that could result in damage to the Meter or equipment to which it is connected.
Introduction and Specifications General Safety Summary 1 Description of IEC 61010 Measurement Categories The IEC 61010 safety standard defines four Overvoltage (Installation) Categories (CAT I to CAT IV) based on the magnitude of danger from transient impulses as shown in Figure 1-1. CAT I Electronic CAT II Appliances, PCs, TVs CAT III MC Panels, etc.
DMM4020 Users Manual Compliance Information This section lists the EMC (electromagnetic compliance), safety, and environmental standards with which the instrument complies. EMC ComplianceThe DMM4020 was evaluated using an M2 CDN with the instrument chassis referenced to earth ground. EC Declaration of Conformity—EMC Meets intent of Directive 2004/108/EC for Electromagnetic Compatibility.
Introduction and Specifications Compliance Information 1 Australia / New Zealand Declaration of Conformity – EMC Complies with the EMC provision of the Radiocommunications Act per the following standard, in accordance with ACMA: CISPR 11:2003. Radiated and Conducted Emissions, Group 1, Class A, in accordance with EN 61326-1:2006 and EN 61326-2-1:2006.
DMM4020 Users Manual Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution that becomes conductive due to condensation. These are sheltered locations where neither temperature nor humidity is controlled. The area is protected from direct sunshine, rain, or direct wind. Pollution Degree 4. Pollution that generates persistent conductivity through conductive dust, rain, or snow. Typical outdoor locations. Pollution Degree Pollution Degree 2 (as defined in IEC 61010-1).
Introduction and Specifications Introduction 1 Introduction The Tektronix DMM4020 Digital Multimeter (hereafter referred to as the Meter) is a 51/2 digit dual-display multimeter designed for bench-top, field service, and system applications. The multiple measurement functions, plus the RS-232 remote interface, make the Meter an ideal candidate for precision manual measurements and use in automated systems.
DMM4020 Users Manual User Documentation The user documentation for this Meter includes the following: Accessory Where to find 071-2694-xx Safety and Installation Manual + Technical Reference (Specifications and Performance Verification) Part number + 077-0365-xx + Users Manual (This manual) Available in the following languages: + 077-0364-xx 077-0376-xx 077-0377-xx 077-0378-xx 077-0379-xx 077-0380-xx 077-0381-xx 077-0382-xx 077-0383-xx 077-0384-xx English French Italian German Spanish Japanese S.
Introduction and Specifications Instrument Security Procedures 1 Instrument Security Procedures This section describes the Meter’s memory elements and the procedures for clearing them. Volatile Memory Table 1-1 lists the Meter’s volatile memory elements. Table 1-1. Volatile Memory Space Type RAM Size 2 KB Function U44, Microprocessor Memory: Measurement data, user strings, and temporary configuration information. Non Volatile Memory Table 1-2 lists the Meter’s non-volatile memory elements. Table 1-2.
DMM4020 Users Manual Options and Accessories Table 1-3 lists available options and accessories. Table 1-3. Accessories Model / Part Number 1 Description TL710 196-3520-00 Premium Test Lead Set 013-0369-00 Calibration fixture; 4 terminal shorting bar Y8846S (Fluke) Rack Mount Kit Single Y8846D (Fluke) Rackmount Kit Dual TL705 2X4 Wire Ohm Precision Test Leads TL725 2X4 Wire Ohm Tweezers Test Leads 159-0488-00 Fuse, 11 A, 1000 V, Fast, .406INX1.
Introduction and Specifications General Specifications 1 Display Vacuum Fluorescent Display, segment Environment Temperature Operating ........................................................ 0 °C to 50 °C Storage ........................................................... -40 °C to 70 °C Warm Up......................................................... ½ hour to full uncertainty specifications Relative Humidity (non-condensing) Operating ........................................................
DMM4020 Users Manual Electrical Specifications Specifications are valid for 5-½ digit mode and after at least a half-hour warm-up. DC Voltage Specifications Maximum Input ................................................. 1000 V on any range Common Mode Rejection................................. 120 dB at 50 or 60 Hz ±0.1％ (1 kΩ unbalance) Normal Mode Rejection .................................... 80 dB at Slow Rate A/D Nonlinearity ................................................
Introduction and Specifications Electrical Specifications 1 AC Voltage Specifications AC Voltage specifications are for ac sinewave signals >5 % of range. For inputs from 1 % to 5 % of range and <50 kHz, add an additional error of 0.1 % of range, and for 50 kHz to 100 kHz, add 0.13 % of range. 7 Maximum Input ................................................. 750 V rms or 1000 V peak or 8 x 10 Volts-Hertz product Measurement Method ....................................... AC-coupled true-rms.
DMM4020 Users Manual Resistance Specifications are for 4-wire resistance function, or 2-wire resistance with REL. If REL is not used, add 0.2 Ω for 2-wire resistance plus lead resistance. Measurement Method ....................................... Current source referenced to LO input Max Lead Resistance (4-wire ohms) ............... 10 % of range per lead for 200 Ω, 2 kΩ ranges. 1 kΩ per lead on all other ranges. Input Protection ................................................
Introduction and Specifications Electrical Specifications 1 Accuracy Uncertainty Range [1] 90 days 200 μA 2 mA 20 mA 200 mA 2A 10 A Temperature Coefficient/°C Outside 18 – 28 °C 1 year 23 °C ± 5 °C 23 °C ± 5 °C 0.02 + 0.005 0.03 + 0.005 0.003 + 0.001 0.015 + 0.005 0.03 + 0.02 0.02 + 0.005 0.05 + 0.02 0.18 + 0.01 0.02 + 0.005 0.04 + 0.02 0.03 + 0.008 0.08 + 0.02 0.2 + 0.01 0.002 + 0.001 0.005 + 0.001 0.005 + 0.001 0.008 + 0.001 0.008 + 0.
DMM4020 Users Manual Frequency Gate Time .......................................................... 131 ms Measurement Method ....................................... AC-coupled input using the ac voltage measurement function. Settling Considerations ................................... When measuring frequency after a dc offset voltage change, errors may occur. For the most accurate measurement, wait up to 1 second to allow input blocking RC time constant to settle. Measurement Considerations ..............
Chapter 2 Preparing the Meter for Operation Title Introduction.......................................................................................................... Unpacking and Inspecting the Meter ................................................................... Storing and Shipping the Meter ........................................................................... Power Considerations ..........................................................................................
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Preparing the Meter for Operation Introduction 2 Introduction This chapter explains how to prepare the Meter for operation by selecting the proper line voltage, connecting the proper power cord for the selected line voltage, and turning the Meter on. Also included is information on the proper storage, shipping, and cleaning of the Meter. Unpacking and Inspecting the Meter Every care is taken in the choice of packing material to ensure that your Meter will reach you in perfect condition.
DMM4020 Users Manual Selecting the Line Voltage The Meter operates on four different input line voltages. The selected line-voltage setting is visible through the window in the line-fuse holder on the Meter’s rear panel. 1. Unplug the power cord. 2. Insert a small screwdriver blade into the narrow recess to the left of the fuse holder and pry it to the right until the holder pops out. See Figure 2-1. 3. Remove the voltage-selector block from the fuse holder. 4.
Preparing the Meter for Operation Power Considerations 2 120 eue20.eps Figure 2-1. Replacing the Line Power Fuse Current-Input Fuses The 200 mA and 10 A inputs are protected by user-replaceable fuses. • The 200 mA input is protected by a fuse (F2) rated at 440 mA, 1000 V (fast blow), 10,000 A minimum breaking capacity. • The 10 A input is protected by a fuse (F1) rated at 11 A, 1000 V (fast blow), 10,000 A minimum breaking capacity.
DMM4020 Users Manual To replace the current-input fuses: 1. Remove power from the Meter by unplugging its power cord. 2. Turn the Meter upside down. 3. Remove the retaining screw on the fuse access door located on the bottom of the Meter. See Figure 2-2. 4. Remove the protective cover from the fuse holders by slightly depressing the back edge of the cover to unlatch it from the printed circuit board. Pull up on the back edge of the cover and remove it from the fuse compartment. 5.
Preparing the Meter for Operation Connecting to Line Power 2 Connecting to Line Power XW Warning To avoid shock hazard, connect the factory supplied threeconductor line power cord to a properly grounded power outlet. Do not use a two-conductor adapter or extension cord, as this will break the protective ground connection.
DMM4020 Users Manual Adjusting the Bail The Meter’s bail (handle) is adjustable to provide two viewing angles. The bail is also adjustable for carrying or storing the Meter. To adjust the bail, pull the ends out to a hard stop (about 1/4-inch on each side) and then rotate it to one of the four stop positions as shown in Figure 2-3. To remove the bail, adjust it to the vertical stop position and pull the ends all the way out. 1 Store 3 2 Tilt up Carry 4 Remove eue21.eps Figure 2-3.
Preparing the Meter for Operation Installing the Meter into an Equipment Rack 2 Installing the Meter into an Equipment Rack The Meter is mountable in a standard 19-inch rack using a rack mount kit. See the “Accessories” section in Chapter 1 for ordering information. To prepare the Meter for rack mounting, remove the bail and remove the front and rear protective boots. To remove a boot, stretch a corner then slide it off as shown in Figure 24.
DMM4020 Users Manual Fluke 45 Emulation Mode The Fluke 45 emulation mode enables you to use programs that run on the Fluke 45 multimeter model on the Tektronix DMM4020. To switch the Meter to Fluke 45 emulation: 1. Press and hold S and f for two seconds. 2. Press U or V to scroll between 4020 and Fluke 45. The presently selected mode will appear bright in the display, while the other is dim. 3. Press R to set the mode and reset the Meter.
Chapter 3 Operating the Meter from the Front Panel Title Introduction.......................................................................................................... Dual Display ........................................................................................................ Primary Display............................................................................................... Secondary Display........................................................................................
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Operating the Meter from the Front Panel Introduction 3 Introduction The Meter can be controlled either by sending commands through its RS232 communication interface or through the front panel. This chapter explains the function and use of the controls and indicators located on the front panel of the Meter. Operating the Meter through its RS232 communication interface is covered in Chapter 4.
DMM4020 Users Manual 1 2 3 INPUT TEKTRONIX DMM4020 5-1/2 DIGIT MULTIMETER SENSE V 4 4W 2W/4W HI HI 1000V MAX 750V 1000 V 600 V CAT I 300V CAT II 1V LO LO 500 Vpk 200 mA MAX 10 A MAX mA 17 10A 15 16 14 13 12 11 10 9 8 7 6 5 gdb02.eps Figure 3-1. Front Panel Table 3-1. Front-Panel Features No. Name Description A INPUT VZYR HI, LO Input terminals for Volts, 2-Wire and 4-Wire Ohms, and Hz measurements. All measurements use the INPUT LO terminal as a common input.
Operating the Meter from the Front Panel Introduction 3 3-1. Front-Panel Features (cont.) No.
DMM4020 Users Manual Dual Display The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 32 for an overview of the display annunciators and indicators. The dual display is comprised of a primary display and a secondary display, which show measurement readings, annunciators and messages. The annunciators indicate measurement units and the Meter’s operating configuration. The dual display allows you to see two properties for the input signal you are measuring.
Operating the Meter from the Front Panel Dual Display 3 Table 3-2. Display Annunciators and Indicators No.
DMM4020 Users Manual Rear Panel See Figure 3-3 and Table 3-3 for an overview of the rear-panel features. 1 2 3 220 LR44340 N60 TEKTRONIX CORPORATION Made in China www.tektronix.com 5 4 gdb03.eps Figure 3-3. Rear Panel Table 3-3. Rear-Panel Features No.
Operating the Meter from the Front Panel Adjusting Meter Range 3 Adjusting Meter Range Ranging operations are performed using R, Uand V. Press R to toggle between autorange and manual range modes. When autoranging is selected, Auto Range is displayed. When manual ranging is selected, Manual Range is displayed. In autoranging mode, the Meter automatically selects the next higher range when a reading is greater than full-scale.
DMM4020 Users Manual The Meter selects the appropriate range in the autorange mode. The function and measurement are displayed. INPUT SENSE V 4W 2W/4W HI 1000V MAX 750V Circuit Under Test HI 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX 10 A MAX mA 10A eue10.eps Figure 3-4. Voltage and Frequency Measurement Measuring Frequency The Meter measures the frequency of ac signals between 20 Hz and 1 MHz. To perform a frequency measurement: 1.
Operating the Meter from the Front Panel Selecting a Measurement Function 3 2-Wire Resistance Measurement To perform a 2-wire resistance measurement: 1. Connect test leads between the Meter and the circuit under test as shown in Figure 3-5. 2. If required, press O to select 2-wire resistance measurement mode. 2*4 Wire is displayed. The function and measurement are displayed.
DMM4020 Users Manual 4-Wire Resistance Measurement The Meter incorporates two methods of making a four-wire resistance measurement. The traditional method is to use four meter leads to connect the Meter to the resistance to be measured. The optional 2X4 Wire test leads simplifies the four-wire measurement so you only have to plug in two test leads to the Input HI and LO connectors of the meter. To perform a 4-wire resistance measurement using four test leads: 1.
Operating the Meter from the Front Panel Selecting a Measurement Function 3 To make a four-wire resistance measurement using the Tektronix 2X4 test leads: 1. Connect the test leads to the Meter’s input connectors as show in Figure 3-7. 2. Press N. 2*4 Wire is displayed. INPUT SENSE V 4W 2W/4W HI 1000V MAX 750V HI 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX 10 A MAX mA 10A Ground tab eue26.eps Figure 3-7.
DMM4020 Users Manual I < 200 mA INPUT SENSE V 4W 2W/4W HI HI 1000V MAX 750V 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX V AC 10 A MAX mA 10A eue13.eps Figure 3-8. Current Measurement <200 mA I > 200 mA and I < 10 A INPUT SENSE V 4W 2W/4W HI 1000V MAX 750V HI 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX mA V AC 10 A MAX 10A eue14.eps Figure 3-9.
Operating the Meter from the Front Panel Selecting a Measurement Function 3 2. Connect the test leads between the Meter and the circuit under test as shown in Figure 3-10. The beeper emits a continuous tone if the input is below 20 Ω. To perform a diode or transistor junction test: 1. If required, press G to select the diode test function. 2. Connect the test leads between the Meter and the diode or transistor junction as shown in Figure 3-11.
DMM4020 Users Manual Making a Triggered Measurement The Meter features a trigger function that allows you to select a measurement trigger source. When the trigger mode is set to 3 or 5, the delay between receiving the trigger and the start of a measurement is 400 ms. Refer to Chapter 1 for trigger delay response specifications. Upon completion of each measurement, a “measurement-complete” signal (low-true pulse) is sent to the external trigger terminal on the rear panel.
Operating the Meter from the Front Panel Selecting a Measurement Function 3 Table 3-4. RS-232 Pin Out 1 2 6 3 7 4 8 5 9 eue23.eps Pin # Description Pin # Description 1 +5 V OUT 2 RS-232 RXD 3 RS-232 TXD 5 RS-232 GND 6 Trigger Out 9 Trigger In Figure 3-12 shows a method for using the +5 V OUT (pin 1) signal with an external switch to trigger the Meter. +5 V Out (Pin 1) Trig In (Pin 9) eue24.eps Figure 3-12.
DMM4020 Users Manual Selecting a Function Modifier This section describes the function modifiers available with the Meter. Function modifiers are actions that the Meter performs on an input before a reading is displayed (for example, a comparison to another value). Function modifiers can be used in combination. See the “Using Function Modifiers in Combination” section later in this chapter.
Operating the Meter from the Front Panel Selecting a Function Modifier 3 A voltage measurement is converted to dBm using the following formula (value is the measurement value): ⎛ 1000 * Value 2 ⎞ ⎟ dBm = 10 log⎜ ⎟ ⎜ R ref . ⎠ ⎝ The reference impedance can be set to any of 21 reference impedances listed in Table 3-5 by using the list editor as described in the "Using the List Editor" section later in this chapter. Table 3-5.
DMM4020 Users Manual If you are in the autorange mode when Touch Hold is selected, you will autorange to the correct range. If you are in the manual range mode when Touch Hold is selected, you will be in the fixed range you were in when Touch Hold was selected. The Touch Hold function can be combined with the minimum/maximum modifier to hold and update only when a new minimum or maximum value is detected. To force the display to update, with Touch Hold selected press I for less than 2 seconds.
Operating the Meter from the Front Panel Selecting a Function Modifier 3 Using the Function Modifiers in Combination You can use multiple function modifiers simultaneously. Selected modifiers are evaluated in the following order: Touch Hold, minimum/maximum, and then relative readings. The Meter first looks for a stable measurement for Touch Hold, then determines if the measurement is a new minimum or maximum value, and then subtracts the relative base from the measurement.
DMM4020 Users Manual 3-6. Second Level Operations (cont.) Buttons Description Q and V[1] In COMP mode, stores value on primary display as LO compare point (see the “Using the Compare Function” section later in this manual) Q and U[1] In COMP mode, stores value on primary display as HI compare point (see “Using the Compare Function”) [1] Hold both buttons for 2 seconds.
Operating the Meter from the Front Panel List and Number Editors 3 Using the List Editor The list editor is used to select the options described in Table 3-7. You may abort an edit and return to normal operation at any time by pressing Q. To use the list editor: 1. Select the option list that you want to edit by pressing the applicable button(s) as indicated in Table 3-7. The option list type is shown in the secondary display and the associated options are shown in the primary display. 2.
DMM4020 Users Manual To use the number editor: 1. Select the number to be edited by pressing the applicable buttons as shown in Table 3-8. The last number entered or value measured is displayed with the leftmost digit bright and the remaining digits dim. (If the number is negative, the minus sign is bright.) Related annunciators are displayed. Table 3-8.
Operating the Meter from the Front Panel Power-Up Configuration • Touch Hold level (1, 2, 3, 4) • Last recorded minimum and maximum values for MINMAX modifier • Last recorded relative base • Relative base shown in secondary display (enabled or disabled) • Last HI-LO settings in compare mode • Trigger mode (1, 2, 3, 4, 5) • Echo setting (on or off) • dB and dB reference • RS-232 settings • PRINT mode • Data format (with or without UNIT) sending through the RS-232 3 Power-Up Configurat
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Chapter 4 Operating the Meter Using the Computer Interface Title Page Introduction........................................................................................................4-3 Local and Remote Operations .......................................................................4-3 Computer Interfaces ......................................................................................4-3 Preparing the Meter for Operations via the RS-232 Interface ...........................
DMM4020 Users Manual Measurement Queries ....................................................................................4-23 Compare Commands and Queries .................................................................4-24 Trigger Configuration Commands.................................................................4-24 Miscellaneous Commands and Queries.........................................................4-25 RS-232 Remote / Local Configurations .................................................
Operating the Meter Using the Computer Interface Introduction 4 Introduction This chapter describes how to set up, configure and operate the Meter via the RS-232 computer interface on the Meter’s rear panel. The Meter can be operated from a host (a terminal, controller, PC, or computer) by sending commands to the Meter through its computer interface. An annotated sample program illustrating the use of the RS-232 computer interface is provided at the end of this chapter.
DMM4020 Users Manual 6. Press R to review the settings. When you are ready to accept the settings, press and hold R. Table 4-1. RS-232 Communication Parameters Factory Settings Parameter Factory Setting Interface RS-232 (Print-only rate set to 0) Baud rate 9600 Parity None (parity bit 0) Number of data bits 8 (7 data bits plus 1 parity bit) Number of stop bits 1 Echo Off RS-232 Print-Only Mode The print-only mode is used to send measurements to a printer or terminal automatically.
Operating the Meter Using the Computer Interface Preparing the Meter for Operations via the RS-232 Interface 4 Table 4-2. Print Rates in RS-232 Print-Only Mode Rate (N) Seconds between Outputs Minutes between Outputs Slow Slow Medium Fast Medium Fast Hours between Outputs Slow Medium Fast 1 0.4 0.05 0.01 0.01 2 0.8 0.1 0.02 0.01 5 2.0 0.25 0.05 0.03 10 4.0 0.5 0.1 0.07 0.01 20 8.0 1.0 0.2 0.13 0.02 50 20.0 2.5 0.5 0.33 0.04 0.01 0.01 100 40.0 5.0 1.0 0.
DMM4020 Users Manual Character Echoing and Deletion When the Meter is operated via the RS-232 interface, you can control whether characters are echoed to the host's display screen. When Echo is on, characters sent to the Meter are echoed on the host's display screen and prompts are returned. When Echo is off, characters are not echoed, and prompts are not returned. To set the Echo parameter, refer to the “Setting Communication Parameters (RS-232)” section earlier in this chapter.
Operating the Meter Using the Computer Interface How the Meter Processes Input 4 6. If the Meter does not respond as indicated, refer to the “If Test Fails” section. If Test Fails If the Meter does not respond as indicated in the “Installation Test for RS-232 Operation” section, perform the following: 1. Ensure all cables are properly connected. See the “Cabling the Meter to a Host or Printer (RS-232)” section earlier in this chapter. 2. Ensure that the communication parameters (baud rate, parity, etc.
DMM4020 Users Manual In some instances, a terminator is automatically transmitted at the end of the host’s output string (the Meter's input string). Sending Numeric Values to the Meter Numeric values can be sent to the Meter as integers, real numbers, or real numbers with exponents, as shown in the following examples: +12345689 Sends the signed integer “12345689” -1.2345E2 Sends “-1.2345E2” or “-123.
Operating the Meter Using the Computer Interface Triggering Output +1.2345E+6(format 1) Measured value of 1.2345M +12.345E+6 OHM(format 2) Measured value of 12.345M ohms +/- 1.0E+9 Overload (0L on the display) 4 Triggering Output The Meter takes measurements when triggered to do so. There are five trigger types, which are described in Table 4-3. Triggers fall into two basic categories: • Internal trigger, which triggers measurements continuously.
DMM4020 Users Manual If you enter the remote mode with trigger type 4 or 5 selected, the Meter remains in its external trigger state; however, because the Meter is in the remote mode, you will only be able to trigger measurements with rear trigger types 4 and 5. To exit remote mode, perform steps 1 and 2 and select trigger type 2 or 3 (as applicable). Note In external trigger mode (mode 2 to mode 5), *TRG command is always available.
Operating the Meter Using the Computer Interface Status Registers 4 Status Registers The contents of the status register (STB) are determined by the service enable register (SRE), event status register (ESR), event status enable register (ESE), and the output buffer. These status registers are explained in the following paragraphs and summarized in Table 4-5. Figure 4-2 shows the relationship of these registers. Table 4-5.
DMM4020 U Po w er O n se rR e C om que st m an Ex d Er ec ro ut r io D ev n E rro ic e r D Q ep ue e ry nd Er en R tE eq ror rro ue r st C O on pe tro ra l tio n C om pl et e Users Manual 7 6 5 4 3 2 1 0 Standard Event Status Register Read Using *ESR? Logical OR & & & & & & & Queue Not-Empty & 7 6 5 4 3 2 1 0 Standard Event Status Enable Register Read Using *ESE? Write to Using *ESE Output Queue Read by Serial Poll RQS Service Request Generation 7 6 ESB MAV 3 2 1 0 Status Byte Regist
Operating the Meter Using the Computer Interface Status Registers 4 Operation Complete Request Control Query Error Device Dependent Error Execution Error Command Error User Request Power On When any enabled bit in the ESR changes from 0 to 1, the ESB bit in the STB also changes to 1. When the ESR is read using the *ESR? command or cleared using the *CLS command, the ESB bit in the STB returns to 0.
DMM4020 Users Manual Table 4-6. Description of Bits in ESR and ESE Bit No. Name Condition 0 Operation Complete (OPC) All commands before receipt of an *OPC command have been executed. Interface is ready to accept another message. 1 Not used Always set to 0. 2 Query Error (QYE) Attempted to read data from the Meter's output buffer when no output was present or pending. Or received a new command line before a previous query was read. Or input and output buffers were full.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Table 4-7. Description of Bits in the Status Byte Register (STB) (cont.) Bit No. 6 Name Condition Master Summary Status (MSS) [1] Set to 1 if any enabled bit in the STB (MSS) register is set to 1; otherwise set to 0. To determine the status of MSS bit, send STB? query command. Request Service (RQS) is set to 1 if service requested from front panel or MSS is set to 1.
DMM4020 Users Manual Common Commands Table 4-8 describes common commands. Table 4-8. Common Commands Command Name Description *CLS Clear Status Clears all event registers summarized in the status byte (except Message Available, which is cleared only if *CLS is the first message in the command line). *ESE Event Status Enable Sets Event Status Enable Register to , where is an integer between 0 and 255.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Table 4-8. Common Commands (cont.) Command *SRE Name Service Request Enable Description Sets the Service Request Enable Register to , where is an integer between 0 and 255. The value of bit 6 is ignored because the Service Request Enable Register does not use it. is an integer whose binary equivalent corresponds to the state (1 or 0) of bits in the register.
DMM4020 Users Manual Table 4-9. Function Commands and Queries (cont.) Commands Primary Display Function Secondary Display FUNC1? (Not applicable) Meter returns function selected as command mnemonic. For example, if frequency is selected, FUNC1? returns FREQ. (Not applicable) FUNC2? Meter returns function selected as command mnemonic. For example, if frequency is selected, FUNC2? returns FREQ If secondary display is not in use, an Execution Error is generated.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Function Modifier Commands and Queries Table 4-10 describes function modifier commands and queries. A function modifier causes the Meter to modify the normal operation of a measurement function or to perform an action on a measurement before displaying a reading. For example, the relative modifier (REL) causes the Meter to display the difference between a measured value and the relative base.
DMM4020 Users Manual Table 4-10. Function Modifier Commands and Queries (cont.) Command Description HOLDTHRESH? Meter returns Touch Hold (1, 2, 3, or 4). See “Touch Hold Function (HOLD)” in Chapter 3 for more information. MAX Meter enters MAX modifier with present reading as maximum value. If already in MAX modifier, Meter displays maximum value. In MAX modifier, autoranging is disabled. See “Minimum / Maximum Modifier (MIN MAX)” in Chapter 3 for more information.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Table 4-10. Function Modifier Commands and Queries (cont.) Command MOD? Description Meter returns a numeric value indicating modifiers in use, where 1 = MIN; 2 = MAX; 4 = HOLD; 8 = dB; 16 = dB Power; 32 = REL; and 64 = COMP. If multiple modifiers are selected, the value returned is equal to the sum of the values of the selected modifiers. For example, if dB and REL are selected, 40 is returned.
DMM4020 Users Manual Table 4-11. Range and Measurement Rate Commands and Queries (cont.) Command RANGE Description Sets the primary display to where is the number in the Range Value column of Table 4-11A that corresponds with the applicable function ranges (voltage, ohms, current, etc.). Table 4-11A. Ranges for Each Function Range Value Voltage Range Ohms Range AC Current Freq.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Measurement Queries Table 4-12 describes measurement queries, which are shown on the primary and/or secondary displays. Table 4-12. Measurement Queries Command Description MEAS1? Meter returns the value shown on the primary display after the next triggered measurement is completed. MEAS2? Meter returns the value shown on the secondary display after the next triggered measurement is completed.
DMM4020 Users Manual Compare Commands and Queries Table 4-13 describes the compare commands and queries. These commands cause the Meter to determine whether a measurement is higher than, lower than, or within a specified range. These commands correspond with C, U and V on the front panel. Table 4-13. Compare Commands and Queries Command Description COMP Meter enters compare (COMP) function. Touch Hold is automatically turned on. (Touch Hold can be turned off with HOLDCLR command.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Miscellaneous Commands and Queries Table 4-15 describes miscellaneous commands and queries. Table 4-15. Miscellaneous Commands and Queries Command Description ^C (CONTRL C) Causes => to be output. FORMAT Set output to 1 or 2. Format 1 outputs measurement values without measurement units (VDC, ADC, OHMS, etc.). Format 2 allows measurement units to be output with measurement units.
DMM4020 Users Manual RS-232 Remote / Local Configurations Table 4-17 describes the RS-232 remote and local configuration commands, which are used with the RS-232 interface to set up the remote/local configuration of the Meter. These commands are valid only when the RS-232 interface is enabled. Table 4-17. Remote/Local Configuration Commands Command Description REMS Puts the Meter into remote (REMS) state mode without front panel lockout. r is shown on the display.
Operating the Meter Using the Computer Interface Sample Program Using the RS-232 Computer Interface 4 gdb23f.eps Figure 4-4.
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Appendices Appendix A B Title Page Applications ........................................................................................................ A-1 2X4 Test Leads ...................................................................................................
Appendix A Applications Introduction This chapter discusses some applications that will help you use the Meter effectively. These applications assume you are familiar with the basic operation of the Meter and have a basic understanding of electronics. A sophisticated understanding of electrical circuits is not necessary. Using the Dual Display Using the dual display effectively and with ingenuity can greatly enhance your test and measurement capabilities.
DMM4020 Users Manual eue25.eps Figure A-1. Example of Dual Display Showing Volts AC and Frequency Using Measurement Functions in Combination The dual display allows you to display select combinations of measurements for the input signal being measured. Allowable combinations of properties are shown in Table A-1. Volts (dc + ac) rms or current (dc + ac) rms measurements can only be made in the primary display.
Appendices Applications A If the relative readings value of a dc voltage measurement is shown in the primary display and the dc voltage itself is shown in the secondary display, the Meter takes a single measurement and updates both displays with it. Updating Primary and Secondary Displays with Separate Measurements If the measurement function in the primary display is different from that in the secondary display, the Meter updates each display using a separate measurement.
DMM4020 Users Manual Table A-2. Sample Dual Display Applications (cont.) Primary Display Secondary Display Applications REL Resistance • Select and sort resistors. (See also "Using the Compare Function" in Chapter 3.
Appendices Applications A Response Times Response time is the time between a change in an input and when that change is displayed.
DMM4020 Users Manual Table A-3. Typical Single Measurement Response Times (in Seconds) Slow Rate Meas. Function Auto Range[1] Medium Rate Single Range[2] Auto Range[1] Fast Rate Single Range[2] Auto Range[1] Single Range[2] D 1.2 0.4 0.7 0.1 0.5 0.05 A 1.2 0.2 0.7 0.1 0.5 0.05 E 1.4 0.4 0.8 0.1 0.6 0.05 B 1.0 0.2 0.6 0.1 0.5 0.05 O 3.2 0.4 1.8 0.2 1.1 0.10 G N/A N/A N/A N/A N/A N/A F 1.2 0.4 0.72 0.18 0.56 0.
Appendices Applications A Table A-5. Typical Measurement Intervals (in Seconds) for Dual Display Measurements Meas. Function Range Slow Med Fast D All 1.2 1.0 0.9 A All 1.0 0.85 0.8 E All 1.2 1.0 0.9 B All 1.0 0.85 0.8 O N/A N/A N/A N/A G N/A N/A N/A N/A F N/A N/A N/A N/A External Trigger The external trigger can be used with or without settling delays, as shown in Table A-4. (Refer to Table 4-3 for trigger types.
DMM4020 Users Manual Making Low-Level Current Measurements There are many applications where obtaining the utmost accuracy in low-level current measurements is critical. For example, determining the leakage current of a battery operated device in its standby mode is critical in determining the time before battery recharge is needed. Traditional multimeters make these measurements using a shunt method shown in Figure A-3.
Appendix B 2X4 Test Leads Introduction The optional Tektronix TL705 test leads simplify making 4-wire ohm measurements by integrating the Hi-Hi Sense and Lo-Lo Sense test leads into one cable. The Meter’s Input HI and LO jacks consist of two contacts. One contact is connected to HI or LO input circuits and the other contact is connected to the Sense input circuits. Like the input jacks, the 2x4 test lead also has two contacts that align with the input jack contacts to provide a four wire connection.
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Index —A— —L— Accessories, 1-13 Line Voltage Selection, 2-4 List and Number Editors, 3-21 —B— Bail Adjustment of, 2-8 Removal of, 2-8 —C— Calibration, 3-24 Cleaning the Meter, 2-9 Compliance Information, 1-7 —D— Diode Test, 3-13 Display, 3-5 —E— Environmental Considerations Equipment Recycling, 1-9 Restriction of Hazardous Substances, 1-9 —F— Fluke 45 Emulation Mode, 2-10 Front Panel Features, 3-3 Function Keys, 3-23 Fuses Current-Input, 2-5 Line-Power, 2-4 —I— Impedances Reference, 3-18 Installat
DMM4020 Users Manual —T— Trigger Mode, 3-15 —U— Unpacking Meter, 2-3 2 User Documentation, 1-11 —W— Warranty, 1-14
