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Tektronix DMM4020 User Manual

Tektronix DMM4020 User Manual

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DMM4020
Digital Multimeter
Users Manual
077-0364-01
www.valuetronics.com

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Summary of Contents for Tektronix DMM4020

  • Page 1 DMM4020 Digital Multimeter Users Manual 077-0364-01 www.valuetronics.com...
  • Page 2 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.
  • Page 3 Tektronix, shipping charges prepaid, and with a copy of customer proof of purchase. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
  • Page 4 www.valuetronics.com...
  • Page 5 Table of Contents Chapter Title Page Introduction and Specifications ............1-1 General Safety Summary ................... 1-3 To Avoid Fire or Personal Injury .............. 1-3 Symbols and Terms ................... 1-6 Safety and Electrical Symbols ..............1-6 Description of IEC 61010 Measurement Categories ......... 1-7 Compliance Information ..................
  • Page 6 DMM4020 Users Manual Environment ....................1-15 Triggering ...................... 1-15 Math Functions ....................1-15 Electrical ......................1-15 Remote Interfaces ..................1-15 Warranty ......................1-15 Electrical Specifications ..................1-16 DC Voltage Specifications ................1-16 AC Voltage Specifications ................1-17 Resistance ...................... 1-18 DC Current ....................
  • Page 7 Contents (continued) Selecting a Function Modifier ................3-18 Relative Readings Modifier (REL) ..............3-18 Decibels and Auto Power Modifier ............... 3-18 Touch Hold Function (HOLD) ..............3-19 Minimum / Maximum Modifier (MIN MAX) ..........3-20 Using the Function Modifiers in Combination ..........3-21 Second Level Operations (Using the SHIFT Button) ........
  • Page 8 DMM4020 Users Manual RS-232 Remote / Local Configurations ............4-26 RS-232 Save / Recall System Configurations ..........4-26 Sample Program Using the RS-232 Computer Interface ........4-26 Appendices A Applications ....................A-1 B 2X4 Test Leads .................... B-1 www.valuetronics.com...
  • Page 9 Non-volatile Memory Space .................. 1-13 1-3. Accessories ......................1-14 2-1. Line Voltage to Fuse Rating................... 2-4 2-2. Line Power Cord Types Available from Tektronix ..........2-7 3-1. Front-Panel Features ....................3-3 3-2. Display Annunciators and Indicators ..............3-6 3-3. Rear-Panel Features ....................3-7 3-4.
  • Page 10 DMM4020 Users Manual viii www.valuetronics.com...
  • Page 11 List of Figures Figure Title Page 1-1. IEC 61010 Measurement Category (CAT) Levels ..........1-7 2-1. Replacing the Line Power Fuse ................2-5 2-2. Replacing the Current-Input Fuses ................. 2-6 2-4. Bail Adjustment and Removal ................2-8 2-4. Boot Removal ......................2-9 3-1.
  • Page 12 DMM4020 Users Manual www.valuetronics.com...
  • Page 13 Chapter 1 Introduction and Specifications Title Page General Safety Summary ..................1-3 To Avoid Fire or Personal Injury ..............1-3 Symbols and Terms ..................1-4 Safety and Electrical Symbols ..............1-6 Description of IEC 61010 Measurement Categories ........1-7 Compliance Information ..................1-8 EMC Compliance ....................
  • Page 14 DMM4020 Users Manual Math Functions ....................1-15 Electrical ......................1-15 Remote Interfaces .................... 1-15 Warranty ......................1-15 Electrical Specifications ..................1-16 DC Voltage Specifications ................1-16 AC Voltage Specifications ................1-17 Resistance ......................1-18 DC Current ...................... 1-18 AC Current ...................... 1-19 Frequency ......................
  • Page 15 Digital Multimeter General Safety Summary 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.
  • Page 16 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.
  • Page 17 Digital Multimeter 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. •...
  • Page 18 DMM4020 Users Manual Symbols and Terms The following terms and safety and electrical symbols may appear in the manual or on the product: A  Warning statement identifies conditions or practices that could result in injury or death. A  Caution statement identifies conditions or practices that could result in damage to the Meter or equipment to which it is connected.
  • Page 19 Digital Multimeter General Safety Summary 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_levels.eps Figure 1-1.
  • Page 20 150 kHz to 80 MHz, with 80% amplitude modulation at 1 kHz) are dependent upon a known quiet protective earth reference connection. The DMM4020 was evaluated using an M2 CDN with the instrument chassis reference to earth ground. Significant measurement error can result under excessively noisy chassis reference conditions.
  • Page 21 Digital Multimeter Compliance Information 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.
  • Page 22 Directives 2002/96/EC and 2006/66/EC on waste electrical and electronic equipment (WEEE) and batteries. For information about recycling options, check the Support/Service section of the Tektronix Web site (www.tektronix.com). Restriction of Hazardous Substances This product has been classified as Monitoring and Control equipment, and is outside the scope of the 2002/95/EC RoHS Directive.
  • Page 23 Digital Multimeter Introduction Introduction The Tektronix DMM4020 Digital Multimeter (hereafter referred to as the Meter) is a 5- 1/2 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.
  • Page 24 DMM4020 Users Manual User Documentation The user documentation for this Meter includes the following: Accessory Where to find Part number 071-2694-xx Safety and Installation Manual 077-0365-xx Technical Reference (Specifications and Performance Verification) Users Manual (This manual) Available in the following languages:...
  • Page 25 Digital Multimeter Instrument Security Procedures 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 Size Function 2 KB U44, Microprocessor Memory: Measurement data, user strings, and temporary configuration information.
  • Page 26 HCTEK4321 Hard case, plastic AC4000 Soft case, nylon All model and part numbers for non-Tektronix products have the vendor listed in parentheses. General Specifications Voltage 100V Setting ............90 V to 110 V 120V Setting ............. 108 V to 132 V 220V Setting .............
  • Page 27 Digital Multimeter General Specifications 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 ............<90 % (0 °C to 28 °C) <75 % (28 °C to 40 °C) <45 % (40 °C to 50 °C) Storage ............
  • Page 28 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 ........
  • Page 29 Digital Multimeter Electrical Specifications 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. Maximum Input ..........
  • Page 30 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.
  • Page 31 Digital Multimeter Electrical Specifications Accuracy Uncertainty Temperature Coefficient/°C Range 90 days 1 year Outside 18 – 28 °C 23 °C ± 5 °C 23 °C ± 5 °C 200 µA 0.02 + 0.005 0.03 + 0.005 0.003 + 0.001 2 mA 0.015 + 0.005 0.02 + 0.005 0.002 + 0.001...
  • Page 32 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.
  • Page 33 Chapter 2 Preparing the Meter for Operation Title Page Introduction ......................2-3 Unpacking and Inspecting the Meter ..............2-3 Storing and Shipping the Meter ................. 2-3 Power Considerations ..................2-3 Selecting the Line Voltage ................2-4 Replacing the Fuses ..................2-4 Line-Power Fuse ..................
  • Page 34 DMM4020 Users Manual www.valuetronics.com...
  • Page 35 Carefully unpack the Meter from its shipping container and inspect the contents for damaged or missing items. If the Meter appears damaged or something is missing, contact the carrier and Tektronix immediately. Save the container and packing material in case you have to return the Meter.
  • Page 36 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.
  • Page 37 Preparing the Meter for Operation Power Considerations 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.
  • Page 38 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.
  • Page 39 2. Verify that the correct fuse for the line voltage is installed. 3. Connect the power cord to a properly grounded three-prong outlet. Refer to Table 2-2 for descriptions of the line-power cords available from Tektronix. Table 2-2. Line Power Cord Types Available from Tektronix...
  • Page 40 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.
  • Page 41 Preparing the Meter for Operation Installing the Meter into an Equipment Rack 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.
  • Page 42 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  and  for two seconds.
  • Page 43 Chapter 3 Operating the Meter from the Front Panel Title Page Introduction ......................3-3 Dual Display ...................... 3-6 Primary Display ..................... 3-6 Secondary Display ..................3-6 Rear Panel ......................3-8 Adjusting Meter Range ..................3-9 Selecting a Measurement Rate ................3-9 Selecting a Measurement Function ..............
  • Page 44 DMM4020 Users Manual www.valuetronics.com...
  • Page 45 Operating the Meter from the Front Panel Introduction 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.
  • Page 46 DMM4020 Users Manual gdb02.eps Figure 3-1. Front Panel Table 3-1. Front-Panel Features Name Description  INPUT V 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. The LO input is isolated and may be safely floated up to 500 V peak above earth ground regardless of the measurement type.
  • Page 47 Operating the Meter from the Front Panel Introduction 3-1. Front-Panel Features (cont.) Name Description   Primary operation: Sets the Meter’s measurement rate to slow, medium or fast Second level operation: Selects source for triggering measurement   Primary operation: Selects Touch Hold function Second level operation: Sets Touch Hold minimum response level ...
  • Page 48 DMM4020 Users Manual Dual Display The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 3- 2 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.
  • Page 49 Operating the Meter from the Front Panel Dual Display Table 3-2. Display Annunciators and Indicators Name Description   Meter is in remote mode (remotely controlled)   The front panel is locked out  Ext Trig Meter is in external trigger mode ...
  • Page 50 DMM4020 Users Manual Rear Panel See Figure 3-3 and Table 3-3 for an overview of the rear-panel features. gdb03.eps Figure 3-3. Rear Panel Table 3-3. Rear-Panel Features Name Description  Line power terminal Connects Meter to power source via power cord ...
  • Page 51 Operating the Meter from the Front Panel Adjusting Meter Range Adjusting Meter Range Ranging operations are performed using , and . Press  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.
  • Page 52 DMM4020 Users Manual The Meter selects the appropriate range in the autorange mode. The function and measurement are displayed. 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.
  • Page 53 Operating the Meter from the Front Panel Selecting a Measurement Function Measuring Resistance The Meter offers 2-wire and 4-wire ohms measurement. Press  to toggle between 2- wire and 4-wire measurement modes. The Meter displays 2*4 Wire at 2 wire or 2x4 wire resistance measurement and displays 4 Wire at 4 wire resistance measurement.
  • Page 54 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.
  • Page 55 Operating the Meter from the Front Panel Selecting a Measurement Function 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 . 2*4 Wire is displayed.
  • Page 56 DMM4020 Users Manual eue13.eps Figure 3-8. Current Measurement <200 mA eue14.eps Figure 3-9. Current Measurement 200 mA to 10 A Automatic Input Terminal Detection For ac and dc current measurement functions, the Meter automatically detects the signal input between the mA and 10 A input terminals. A front-panel annunciator indicates whether the Meter is in the mA or A ranges.
  • Page 57 Operating the Meter from the Front Panel Selecting a Measurement Function 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.
  • Page 58 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.
  • Page 59 Operating the Meter from the Front Panel Selecting a Measurement Function Table 3-4. RS-232 Pin Out eue23.eps Pin # Description Pin # Description +5 V OUT RS-232 RXD RS-232 TXD RS-232 GND Trigger Out 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.
  • Page 60 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.
  • Page 61 Operating the Meter from the Front Panel Selecting a Function Modifier A voltage measurement is converted to dBm using the following formula (value is the measurement value):   1000 Value       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"...
  • Page 62 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.
  • Page 63 Operating the Meter from the Front Panel Selecting a Function Modifier 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.
  • Page 64 DMM4020 Users Manual 3-6. Second Level Operations (cont.) Buttons Description   In COMP mode, stores value on primary display as LO compare point (see the “Using the Compare Function” section later in this manual)   In COMP mode, stores value on primary display as HI compare point (see “Using the Compare Function”)
  • Page 65 Operating the Meter from the Front Panel List and Number Editors List and Number Editors The Meter has a list editor and number editor. The list editor allows you to scroll through and select from a list of options. The number editor allows you to enter or edit a numeric value.
  • Page 66 DMM4020 Users Manual Using the Number Editor Use the number editor to edit the relative base for the relative readings modifier and to set the high and low threshold values for the compare function. Note that you can abort the number editor and return the Meter to normal operation by pressing .
  • Page 67 Operating the Meter from the Front Panel Function Keys S1 – S6 Function Keys S1 – S6 Function keys  through  allow you to save and recall up to six measurement configurations. This helps speed the process of setting up the Meter, and is particularly useful if you repeatedly need the same configurations.
  • Page 68 High/low values for Compare mode (COMP) Minimum and maximum values in MIN MAX modifier 0 Relative base Relative base in secondary display Disabled Trigger type 1 (Internal) Trigger type Calibration Refer to the DMM4020 Technical Reference for instructions on calibrating the Meter. 3-26 www.valuetronics.com...
  • Page 69 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 ......4-3 Setting Communication Parameters (RS-232) ..........4-3 RS-232 Print-Only Mode ................
  • Page 70 DMM4020 Users Manual Compare Commands and Queries ..............4-24 Trigger Configuration Commands ..............4-24 Miscellaneous Commands and Queries ............4-25 RS-232 Remote / Local Configurations ............4-26 RS-232 Save / Recall System Configurations ..........4-26 Sample Program Using the RS-232 Computer Interface ........4-26...
  • Page 71 Operating the Meter Using the Computer Interface Introduction 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.
  • Page 72 The print-only mode is used to send measurements to a printer or terminal automatically. While the Meter will respond to remote commands during print-only operations, Tektronix recommends first setting the Meter's echo mode to OFF. This prevents mixing echoed command characters and incoming data. Refer to the “Setting Communication Parameters (RS-232)”...
  • Page 73 Operating the Meter Using the Computer Interface Preparing the Meter for Operations via the RS-232 Interface Table 4-2. Print Rates in RS-232 Print-Only Mode Seconds between Outputs Minutes between Outputs Hours between Outputs Rate Slow Medium Fast Slow Medium Fast Slow Medium Fast...
  • Page 74 4. Type *IDN? and press Enter. 5. Verify that the Meter sends the following response: TEKTRONIX, DMM4020, nnnnnnn, n.n Dn.n Where nnnnnnn is the Meter’s serial number; n.n is the main software version; and Dn.n is the display’s software version.
  • Page 75 Operating the Meter Using the Computer Interface How the Meter Processes Input 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)”...
  • Page 76 DMM4020 Users Manual 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 “-123.45”...
  • Page 77 Operating the Meter Using the Computer Interface How the Meter Processes Output How the Meter Processes Output The following paragraphs describe how the Meter processes output. The Meter outputs an alphanumeric string in response to a query command from the host. (Query commands end with “?”.) Output strings for RS-232 applications are terminated with a Carriage Return and Line Feed (<CR><LF>).
  • Page 78 DMM4020 Users Manual External Triggering from the Front Panel To enable external triggering from the front panel, perform the following procedure: 1. Press  then . Ext Trig and a number corresponding to the selected trigger type (1, 2, 3, 4, or 5) are displayed. See Table 4-3 for trigger types.
  • Page 79 Operating the Meter Using the Computer Interface Status Registers External Trigger via the Computer Interface To trigger a measurement using the RS-232 computer interface, enter the command *TRG and press Enter. See the “Common Commands” section later in this chapter for use of *TRG command.
  • Page 80 DMM4020 Users Manual aam21f.eps Figure 4-2. Overview of Status Data Structures 4-12 www.valuetronics.com...
  • Page 81 Operating the Meter Using the Computer Interface Status Registers Event Status and Event Status Enable Registers The ESR assigns specified events to specific bits. (See Figure 4-3 and Table 4-6.) When a bit in the ESR is set to 1, the event that corresponds to that bit occurred after the register was last read or cleared.
  • Page 82 DMM4020 Users Manual Table 4-6. Description of Bits in ESR and ESE Bit No. Name Condition Operation Complete (OPC) All commands before receipt of an *OPC command have been executed. Interface is ready to accept another message. Not used Always set to 0.
  • Page 83 Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-7. Description of Bits in the Status Byte Register (STB) (cont.) Bit No. Name Condition Master Summary Status (MSS) Set to 1 if any enabled bit in the STB (MSS) register is set to 1;...
  • Page 84 (1 or 0) of bits in the register. *IDN? Identification Query Meter returns the identification code of the Meter as four fields separated by commas. These fields are: Manufacturer (TEKTRONIX); model (DMM4020); seven-digit serial number; and versions of main software and display software. *OPC Operation Complete...
  • Page 85 Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-8. Common Commands (cont.) Command Name Description *SRE Service Request Enable Sets the Service Request Enable Register to <value>, where <value> is an integer between 0 and 255. The value of bit 6 is ignored because the Service Request Enable Register does not use it.
  • Page 86 DMM4020 Users Manual Table 4-9. Function Commands and Queries (cont.) Commands Function Primary Display 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.
  • Page 87 Operating the Meter Using the Computer Interface Computer Interface Command Set 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.
  • Page 88 DMM4020 Users Manual Table 4-10. Function Modifier Commands and Queries (cont.) Command Description HOLDTHRESH? Meter returns Touch Hold <threshold> (1, 2, 3, or 4). See “Touch Hold Function (HOLD)” in Chapter 3 for more information. Meter enters MAX modifier with present reading as maximum value. If already in MAX modifier, Meter displays maximum value.
  • Page 89 Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-10. Function Modifier Commands and Queries (cont.) Command Description MOD? 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.
  • Page 90 DMM4020 Users Manual Table 4-11. Range and Measurement Rate Commands and Queries (cont.) Command Description RANGE <value range> Sets the primary display to <value range> where <value range> is the number in the Range Value column of Table 4-11A that corresponds with the applicable function ranges (voltage, ohms, current, etc.).
  • Page 91 Operating the Meter Using the Computer Interface Computer Interface Command Set 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.
  • Page 92 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 ,  and  on the front panel.
  • Page 93 Operating the Meter Using the Computer Interface Computer Interface Command Set 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 =><CR><LF> to be output. FORMAT <format> Set output <format>...
  • Page 94 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.
  • Page 95 Operating the Meter Using the Computer Interface Sample Program Using the RS-232 Computer Interface gdb23f.eps Figure 4-4. Sample Program for RS-232 Computer Interface 4-27 www.valuetronics.com...
  • Page 96 DMM4020 Users Manual 4-28 www.valuetronics.com...
  • Page 97 Appendices Appendix Title Page Applications ......................A-1 2X4 Test Leads ....................B-1 www.valuetronics.com...
  • Page 98 www.valuetronics.com...
  • Page 99 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.
  • Page 100 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.
  • Page 101 Appendices Applications 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.
  • Page 102 DMM4020 Users Manual Table A-2. Sample Dual Display Applications (cont.) Primary Secondary Applications Display Display • Select and sort resistors. (See also "Using the Compare Function" Resistance in Chapter 3.) • Show actual measurement while holding a previous, stable HOLD...
  • Page 103 Appendices Applications Response Times Response time is the time between a change in an input and when that change is displayed. The meter’s response time depends on many factors: the measurement function selected, number of measurements being made (single measurement when only the primary display is used, or two measurements when both the primary and secondary display are used), the input level, range type (autorange or manual range), the measurement rate (slow, medium, or fast), and whether measurement types are mixed or...
  • Page 104 DMM4020 Users Manual Table A-3. Typical Single Measurement Response Times (in Seconds) Slow Rate Medium Rate Fast Rate Meas. Auto Single Auto Single Auto Single Function Range Range Range Range Range Range  0.05  0.05  0.05  0.05 ...
  • Page 105 Appendices Applications Table A-5. Typical Measurement Intervals (in Seconds) for Dual Display Measurements Meas. Range Slow Fast Function   0.85   0.85    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.) The amount of trigger delay varies depending on differences between the primary and secondary displays, as described in the previous section.
  • Page 106 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 re- charge is needed.
  • Page 107 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.
  • Page 108 DMM4020 Users Manual www.valuetronics.com...
  • Page 109 Index —A— —L— Accessories, 1-14 Line Voltage Selection, 2-4 List and Number Editors, 3-22 —B— —M— Bail Adjustment of, 2-8 Manuals, 1-12 Removal of, 2-8 Measurement Current, 3-13 Frequency, 3-10 —C— Resistance, 3-10 Calibration, 3-25 2-Wire, 3-11 Cleaning the Meter, 2-9 4-Wire, 3-12 Compliance Information, 1-8 Voltage, 3-9...
  • Page 110 DMM4020 Users Manual User Documentation, 1-12 —T— Trigger Mode, 3-16 —W— Warranty, 1-15 —U— Unpacking Meter, 2-3 www.valuetronics.com...