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DMM4020 Digital Multimeter Users Manual

1. Resolution Range W er Current Source Slow Medium Fast 200 Q 199 999 Q 0 001 Q 0 01 Q 0 01 Q 0 8 mA 2 kQ 1 99999 kQ 0 01 Q 0 1 Q 0 1 0 0 8 mA 20 kQ 19 9999 kQ DIOU 1Q 10 0 08 mA 200 kQ 199 999 kQ IO 100 10Q 0 008 mA 2 MQ 1 99999 MQ 10Q 100 Q 100 Q 0 9 uA 20 MQ 19 9999 MQ 100 Q 1kQ 1kQ 0 16 pA 100 MQ 100 000 MQ 1kQ 10 kQ 10 KQ 0 16 uA 10 MQ Accuracy Uncertainty DU Range Temperature Coefficient C 90 days 1 year Outside 18 28 C 23 C 5 C 23 C 5 C 200 Q 0 02 0 004 0 03 0 004 0 003 0 0006 2 kQ 0 015 0 002 0 02 0 003 0 003 0 0005 20 kQ 0 015 0 002 0 02 0 003 0 003 0 0005 200 kQ 0 015 0 002 0 02 0 003 0 003 0 0005 2 MQ 0 03 0 003 0 04 0 004 0 004 0 0005 20 MQ 0 2 0 003 0 25 0 003 0 01 0 0005 100 MQ 1 5 0 004 1 75 0 004 0 2 0 0005 Notes 1 Uncertainty given as of reading of range DC Current Input Protection Tool accessible 11 A 1000 V and 440 mA 1000 V fuses Shunt Resistance een 0 01 Q for 2 A and 10 A ranges 1 Q for 20 mA and 200 mA Burden voltage lt 5 mV for 200 uA and 2 mA range Input Characteristics Resolution R Full Scale Burden Voltage ange 5 1 2 Digits Slow Medium Fast 200 uA 199 999 LA 0 001 uA 0 01 pA 0 01 pA lt 5 mV 2mA 1999 99 LA 0 01 uA 0 1 yA 0 1 uA lt 5 mV 20 mA 19 9999 mA 0 1 uA 1 pA 1 uA lt 0 05 V 200 mA 199 9
2. Standard 7161 514 3 2 1 Q Event Status Enable Register ESE ESE Y Summary Message Event Summary Bit ESB Bit 5 of Status Byte Register aam22f eps Figure 4 3 Event Status and Event Status Enable Registers 4 13 DMM4020 Users Manual Table 4 6 Description of Bits in ESR and ESE one me enden Operation Complete OPC Device Dependent Error DDE Execution Error EXE Command Error CME All commands before receipt of an OPC command have been executed Interface is ready to accept another message 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 Incorrect input during calibration Or RS 232 input buffer overflow Command was understood but could not be executed This can result from a command that contained an inappropriate parameter Command was not executed because it was not understood This can result from a command that contained a syntax error Power On Power was cycled off and on since the last time the ESR was read or cleared Status Byte Register The STB is a binary encoded register that contains eight bits Note that the SRE uses bits 1 through 5 and 7 to set bit 6 the Master Summary Status MSS bit as enabled by the SRE The eight STB bits are described in Table 4 7 and ar
3. Resolution Range Paste Burden Voltage 5 1 2 Digits Slow Medium Fast 20 mA 19 9999 mA 0 1 uA 1 pA 1 uA lt 0 05 V 200 mA 199 999 mA 1 uA 10 uA 10 uA lt 0 5 V 2A 1 99999 A 10 uA 100 pA 100 pA lt 0 1 V 10A 10 0000 A 100 uA 1 mA 1 mA lt 0 5 V Accuracy Uncertainty Temperature Range Frequency 90 days 1 year Coefficient C 23 C 5 C 23 C 5 C Outside 18 28 C 20 mA 20 Hz 45 Hz 1 0 05 1 25 0 06 0 015 0 005 45 Hz 2 kHz 0 25 0 05 0 3 0 06 0 015 0 005 200 mA 20 Hz 45 Hz 0 8 0 05 1 0 06 0 015 0 005 45 Hz 2 kHz 0 25 0 05 0 3 0 06 0 015 0 005 2A 20 Hz 45 Hz 1 0 05 1 25 0 06 0 015 0 005 45 Hz 2 kHz 0 25 0 05 0 3 0 06 0 015 0 005 10A 20 Hz 45 Hz 1 0 1 1 25 0 12 0 015 0 005 45 Hz 2 kHz 0 35 0 1 0 5 0 12 0 015 0 005 Notes 1 Uncertainty given as of reading of range 1 DMM4020 Users Manual 1 20 Frequency Gate Time Measurement Method Settling Considerations Measurement Considerations AC coupled input using the ac voltage measurement function 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 To minimize measurement errors shield inputs from external noise when measuring low voltage low frequency signals Accuracy Uncertainty Temperature Range Frequency 90
4. eue12 eps Figure 3 6 4 Wire Resistance Measurement 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 9 2 4 Wire is displayed INPUT SENSE var awn Ground tab eue26 eps Figure 3 7 Input Connections for 4 Wire Ohms Using 2x4 Wire Leads Measuring Current A Caution To avoid blowing the current fuse or damaging the Meter do not apply power to the circuit under test until test leads are properly installed to the appropriate input terminals For current measurements above 200 mA install the test leads into the 10 A and LO terminals only The Meter is capable of making ac and dc current measurements up to 10 A To perform a current measurement 1 Turn off power to the circuit under test 2 Connect test leads between the Meter and the circuit under test 3 Ifthe circuit current is unknown start by using the 10 A and LO terminals 4 If the measurement is expected to be below 200 mA connect the test leads to the 200 mA and LO terminals only and remove any leads in the 10 A terminal See Figure 3 8 5 For measurements expected to be 200 mA to 10 A connect the test leads to the 10 A and LO terminals only See Figure 3 9 Press to measure ac current or press to measure de current 7
5. To store the Meter place the box under cover in a location that complies with the storage environment specifications described in the General Specifications section in Chapter 1 Power Considerations The Meter operates on varying power distribution standards found throughout the world and must be set up to operate on the line voltage that will power it The Meter is packed ready for use with a line voltage determined at the time of ordering If the selected line voltage does not match the power that the Meter will be plugged into the Meter s line voltage setting must be changed and replacement of the line fuse may be required 2 3 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 Remove the voltage selector block from the fuse holder Rotate the selector block until the desired voltage rating faces outward Sek r Replace the selector block back into the fuse holder 6 Install the fuse holder back into the Meter and reconnect the power cord Changing the line voltage setting may require a different line power fuse for proper operation Replacing the Fuses
6. 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 on the Meter and host are identical See the Setting Communication Parameters RS 232 section earlier in this chapter How the Meter Processes Input The following sections describe how the Meter processes input received from a host or stand alone terminal Note In this Chapter input means a string sent to the Meter from a host and output means a string sent to the host from the Meter through the computer interface Input Strings The Meter processes and executes valid input strings sent by the host A valid input string is one or more syntactically correct commands followed by an input terminator When the Meter receives input it stores it in a 50 byte input buffer Note Input strings received over the RS 232 interface are not executed or checked for proper syntax until an input terminator is received or the input buffer becomes full The Meter accepts alphabetic characters in uppercase and lowercase If a command cannot be understood the command and the rest of the command line are ignored Input Terminators When the Meter receives an input terminator it executes commands on a first in first out basis as entered since the last terminator was received As i
7. Discard echoed command string PROMPTS INPUTS 4 1 Get prompt IF INSTR 1 PROMPTS gt lt gt 0 THEN RETURN Command successful IF INSTR 1 PROMPT gt lt gt 0 THEN PRINT Command syntax IF INSTR 1 PROMPTS gt lt gt 0 THEN PRINT Command failure PRINT Program execution Halted END gdb23f eps Figure 4 4 Sample Program for RS 232 Computer Interface 4 27 DMM4020 Users Manual 4 28 Appendices Appendix Title Page A E ee LE Gel B 2X4 Test Leads enee eege EE er 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 The dual display allows you to make two measurements on a common input signal which in the past would have required that you use two meters or to make a series of measurements To see how easy it is to use the dual display to take two readings on one signal perform the following example procedure to measure the voltage and frequency of line power l 2 3 4 5 Press on the Meter Plug the test leads into the INPUT VO gt HI and LO terminals Pres
8. Local Configurations ccccescceesceeseeeeeeeeeeteeeseeeseeeeees RS 232 Save Recall System Configurations ceeenneeneeneenennennnn Sample Program Using the RS 232 Computer Interface Operating the Meter Using the Computer Interface 4 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 An annotated sample program illustrating the use of the RS 232 computer interface is provided at the end of this chapter Refer to Chapter 3 for complete descriptions of all Meter functions and features This chapter assumes that you are familiar with the basics of data communication and RS 232 interface Local and Remote Operations When the Meter is operated from a host it is said to be operated remotely When the Meter is operated from its front panel it is said to be operated locally Most operations that can be performed locally can also be performed remotely using the computer interface Some operations like setting communications parameters for the RS 232 interface operations can only be performed from the front panel Computer Interfaces The Meter comes equipped with an RS 232 serial interface Using the interface turns the Meter into a fully programmable instrument
9. Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Power Disconnect The power cord disconnects the product from the power source Do not block the power cord it must remain accessible to the user at all times Do Not Operate Without Covers Do not operate this product with covers or panels removed 1 3 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 AA Warning To avoid possible electric shock personal injury or death read the following before using the Meter e Use the Meter only as specified in this manual or the protection provided by the Meter might be impaired e Donot use the Meter in wet environments e Inspect the Meter before using it Do not use the Meter if it appears damaged e Inspect the test leads before use Do not use them if insulation is damaged or metal is exposed Check the test leads for cont
10. 3 9 Measuring Voltage nenne A A E R 3 9 Measuring Frequency cccccscecsseesseesecseceseceseceseceseeeeeseeeseneseseeeseesseeeaeenaees 3 10 Frequency RAN GING ssie nire EER IRR E AAR R RE 3 10 Measuring Resistance ccccecccessseeseeesseeseceseceseceseenseeeeeeeeeeeeeeeseeeseeeseeeaeesaees 3 10 2 Wire Resistance Measurement ern ennn ern en 3 11 4 Wire Resistance Measurement ernennen 13 12 Measuring Current username EARR ER 3 13 Automatic Input Terminal Detecton eccecccecseesseeseceteceteeeeeeeeeeseeeenseeenes 13 14 Diode Continuity Testing ccccccccssccsseceseceseceseceeeceeecseeeeeeesseeeeaeesseeeaeenaees 13 14 Making a Triggered Measurement esse enne nn ennn en 13 16 Setting the Trigger Mode 13 16 Connecting to an External Trigger uneseenseeeneennennnennneennennn nennen 13 16 Selecting a Function Modifier nennen 3 18 Relative Readings Modifier BRELL 3 18 Decibels and Auto Power Modifier uuneenserseessssneesnnennsennsennneenneenn nn 3 18 Touch Hold Function OHOL Di 3 19 Minimum Maximum Modifier MIN MAN 3 20 Using the Function Modifiers in Combunapon 3 21 Second Level Operations Using the SHIFT Button 13 21 Compare Function COMP 3 22 Setting the Compare Range 3 22 Using the Compare Functon esse ernennen Gas List and Number Editors serie 13 22 Using the List Editor nenn nina 3 23 Using the Number Editor 3 23 Jade 13 24 P
11. All replaced parts modules and products become the property of Tektronix In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by 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 This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servi
12. The Meter uses one fuse to protect the line power input and two fuses to protect the current measurement inputs Line Power Fuse The Meter has a line power fuse in series with the power supply Table 2 1 indicates the proper fuse for each of the four line voltage selections The line power fuse is accessed through the 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 fuse and replace it with a fuse of an appropriate rating for the selected line power voltage See Table 2 1 4 Replace the selector block back into the fuse holder AA Warning To avoid electric shock or fire do not use makeshift fuses or short circuit the fuse holder Table 2 1 Line Voltage to Fuse Rating Line Voltage Selection Fuse Rating 100 120 0 125 A 250 V slow blow 220 240 0 063 A 250 V slow blow Preparing the Meter for Operation 2 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 e The 200 mA input is protected by a fuse F2 rated at 440 mA 1000 V fast blow 10 000 A minimum breaking capacity e The 10 A input is protected by a fuse F1 rated at 11 A 1000 V fast blow 10 000 A minimum breaking capacity AA Warning For protection
13. 00110000 which means that bit 4 MAV and bit 5 ESB are set to 1 If the status byte is read with an STB query bit 6 is returned as Master Summary Status MSS See the following example STB reads the STB If 32 is returned it is converted to its binary equivalent of 00100000 which indicates that bit 5 ESB is set to 1 To determine the event status you would read the ESB in the same manner using the ESR command Computer Interface Command Set The remainder of this chapter describes the RS 232 computer interface commands Commands are grouped by related function and are listed in the tables that follow Parameters that must be supplied by the user or strings returned by the Meter are enclosed in angle brackets for example lt value gt 4 15 DMM4020 Users Manual Common Commands Table 4 8 describes common commands Table 4 8 Common Commands ng name pen 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 lt value gt Event Status Enable Sets Event Status Enable Register to lt value gt where lt value gt is an integer between 0 and 255 lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register If lt value gt is not between 0 and 255 an Execution Error is generated EXAMPLE Decimal 16 converts to binary 000100
14. Apply power to the circuit under test The Meter selects the appropriate range in autorange mode The function and measurement are displayed 3 13 DMM4020 Users Manual I lt 200 mA INPUT SENSE var awn age A d 100V CAT I Maya 600V CATI 300V 1v eue13 eps Figure 3 8 Current Measurement lt 200 mA INPUT SENSE awn A HI 1000v 1000V CATI sov MAX soov car 300V eue14 eps Figure 3 9 Current Measurement 200 mA to 10 A Automatic Input Terminal Detection For ac and de 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 If a test lead is inserted in to the mA input terminal and there isn t a test lead in the 10 A terminal then only the 200 uA to 200 mA ranges are selectable If the 10 A terminal has a test lead then only the 2 A and 10 A ranges are selectable Diode Continuity Testing Press to toggle between the continuity and diode test functions for the primary display These functions cannot be selected for the secondary display To perform a continuity test 1 Ifrequired press to select the continuity test function 2 Operating the Meter from the Front Panel Selecting a Measurement Function Connect the test leads between the Meter and the circuit u
15. Italian 077 037 7 xx German 077 0378 xx Spanish 077 0379 xx Japanese 077 0380 xx S Chinese 077 0381 xx T Chinese 077 0382 xx Korean 077 0383 xx Russian 077 0384 xx About this Manual This manual contains all the information a new user will need to operate the Meter effectively This manual is divided into the following chapters Chapter 1 Introduction and Specifications provides information on how safely to use the Meter and standard and optional accessories and specifications Chapter 2 Preparing the Meter for Operation provides information on setting the Meter s line voltage connecting it to a power source and turning the Meter on Chapter 3 Operating the Meter from the Front Panel provides detailed information on using the Meter from the front panel Chapter 4 Applications provides detailed information on using the Meter to make electrical measurements Chapter 5 Operating the Meter using the Computer Interface describes how to set up configure and operate the Meter via the RS 232 computer interface on the Meter s rear panel Appendices Introduction and Specifications 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 tye se Function S RAM 2 KB U
16. against fire or arc flash replace a blown fuse with a fuse of an identical rating To test the current input fuses 1 Turn on the Meter and plug a test lead into the INPUT VO gt HI terminal 2 Press 8 3 Press GP to set the range to 200 Q Only the 200 Q 2 kQ and 20 KQ ranges can be used to test the mA input fuse 4 Insert the other end of the test lead into the mA terminal If the fuse is good the Meter displays a reading of lt 10 Q If the fuse is blown the Meter displays BL to indicate an overload 5 Remove the test lead from the mA terminal and insert it into the 10 A terminal If the fuse is good the Meter displays a reading of lt 2 Q If the fuse is blown the Meter displays UL to indicate an overload AA Warning To avoid electric shock remove the power cord and any test leads from the Meter before opening the current input fuse cover 2 5 DMM4020 Users Manual To replace the current input fuses l 2 3 Remove power from the Meter by unplugging its power cord Turn the Meter upside down Remove the retaining screw on the fuse access door located on the bottom of the Meter See Figure 2 2 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 Remove the defective fuse and replace it with a fuse of an appropriate rating Se
17. dc measurements are volts de and amps ac and volts ac and amps dc Settling times are listed in Table A 4 Update Rate in the Dual Display Mode The update rate is the time between successive measurements for a steady state signal In the dual display mode when both the primary and secondary displays are on if the measurement functions or the ranges selected for the primary and secondary displays are different the update rate for each measurement function will vary from the update rate for that measurement function when only the primary display is on When the secondary display is on the meter always waits for the measurement to be fully settled after changing the range or function before displaying a reading The amount of delay depends on the functions and ranges selected for the primary and secondary displays as shown in Table A 4 Table A 5 lists the interval between measurements when the measurement function or range of the primary and secondary display differ These intervals vary by measurement function range measurement rate slow medium or fast and measurement type ac and dc type measurements mixed or not mixed DMM4020 Users Manual Table A 3 A Single Measurement Times a Seconds SlowRate e Rate Medium Rate Rate FastRate Rate Meas Auto Single Auto Single Auto Single Function Range Range Range Range Rangel Range em um oo os 06 cos me ef o o o os cos Time to au
18. echo sier then Sets the trigger mode mer then Turns off secondary display primary display unaffected sur then 2 Edits compare mode low point see the Using the Compare Function section later in this manual a 2 5 24 24 2 H H H 2 zi then O Edits compare mode high point see the Using the Compare Function section later in this manual sier and FE In relative mode toggles display of relative base in secondary display and SCT Displays software version 3 21 DMM4020 Users Manual 3 22 3 6 Second Level Operations cont puer Boom and In COMP mode stores value on primary display as LO compare point see the Using the Compare Function section later in this manual and In COMP mode stores value on primary display as HI compare point see Using the Compare Function 1 Hold both buttons for 2 seconds Compare Function COMP The Meter has a compare function COMP that provides an easy way to determine if a reading falls within a designated range of values The compare function can be used with any function modifier Setting the Compare Range Before selecting the compare function you need to set the tolerance range against which the reading that will be compared This can be done in any of the following three ways e Press to enter the compare function mode The reading displayed when you enter the mode can be set to the high or low threshold To set th
19. in the following examples 1 2345E 0 format 1 Measured value of 1 2345 4 8 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 GL on the display 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 e Internal trigger which triggers measurements continuously e External trigger which triggers a measurement at the direction of the user A measurement can be externally triggered as follows e External trigger with rear trigger disabled This includes trigger types 2 and 3 as described in Table 4 3 e External trigger with rear trigger enabled This includes trigger types 4 and 5 as described in Table 4 3 e TRG command For use of the TRG command see Common Commands Table 4 3 Trigger Types External Triggering from the Front Panel To enable external triggering from the front panel perform the following procedure 1 Press then SZT 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 2 Press amp or amp to step through the trigger type list Highlight the trigger type as follows and then press 3 for two seconds to select it Select trigger type 2 to dis
20. not echoed 4 3 DMM4020 Users Manual 6 Press DER to review the settings When you are ready to accept the settings press and hold QB Table 4 1 RS 232 Communication Parameters Factory Settings RS 232 Print only rate set to 0 RS 232 Print Only Mode 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 section earlier in this chapter In the print only mode the Meter sends every N th reading shown on the primary and or secondary displays out the RS 232 port where N is the print rate The print rate is selected from the available values described in Table 4 2 The duration between outputs is determined by the print rate and reading rate of the Meter The minimum rates are 2 5 s at slow rate 20 0 s at medium rate and 100 0 s at fast rate The output is formatted as one measurement per line from the primary display or two measurements per line from the primary and secondary displays Perform the following procedure to select the print only mode and to set the print rate N Note For frequency measurements the reading rate is fixed at four readings per second The reading rate is always fast for Diode and Continuity test
21. or to measure ac voltage 3 9 DMM4020 Users Manual The Meter selects the appropriate range in the autorange mode The function and measurement are displayed INPUT SENSE vos awn A A HI 1000 CATT Mov MAX S i 300V SS Ye m 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 Connect test leads between the Meter and the circuit under test as shown in Figure 3 4 2 Press to measure the frequency of the ac signal The function and measurement are displayed Frequency Ranging Frequency measurements are automatically ranged so that a frequency measurement is always displayed with maximum resolution To select a range manually press E to select the frequency function and then press or amp to select a range manually Manual ranging can be performed on readings displayed in the primary display only If you manually select a frequency range and the measurement exceeds the full scale value of that range UL is displayed to indicate an overload Refer to the Electrical Specifications section in Chapter 1 for frequency ranges and full scale values 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 2
22. rates are provided in Table 4 4 Table 4 4 RS 232 Reading Transfer Rates Readings per Second Internal Trigger Operation Trigger 1 External Trigger Operation Trigger 4 1 Depends on A D trigger speed 2 Depends on how fast the trigger signal is transmitted 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 To trigger a measurement using pin 9 of the RS 232 interface see Figure 4 1 5 V Out Pin 1 Trig In Pin 9 Trigger to uP eue24 eps Figure 4 1 External Trigger Using Pin 9 of RS 232 Interface Operating the Meter Using the Computer Interface 4 Status Registers 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 Status Register Summary Read Command Write Command Enable Event Event Byte Register Register sta None eee Event Status Event Status Register een None Register DMM4020 Users Manual 4 12 Standard Logical OR Standard zielslalslal
23. to maximize measurement speed which can affect accuracy The rate selected is shown in the primary display as Slow Medium or Fast Press to step through the measurement rates The rate selected applies to all basic measurements except frequency When frequency is measured the rate is fixed at RATE 4 measurements per second Pressing does not affect the frequency update rate The measurement rate is always fast for Diode and Continuity test Selecting a Measurement Function To select a measurement function press the applicable function button See Table 3 1 The applicable annunciator is displayed to indicate the selected function For example to measure dc voltage press E DC is displayed To select ac dc total rms readings simultaneously press and for more than two seconds or simultaneously press and for more than two seconds If a reading is shown on the secondary display when a function button is pressed the secondary display turns off and that function is selected for the primary display Measuring Voltage The Meter is capable of measuring voltage up to 1000 V dc and 750 V ac A Caution To avoid possible damage to the Meter do not apply voltage to the Meter s inputs until the test leads are properly connected and the proper voltage function is selected To perform a voltage measurement 1 Connect test leads between the Meter and the circuit under test as shown in Figure 3 4 2 Press to measure dc voltage
24. 0 selected 5000 10000 20000 or 50000 RS 232 baud rate then 300 600 1200 2400 4800 9600 or 19200 Data bits 8 7 Parity options E Even Odd Odd No None Stop bit 1 2 Echo mode On Off Trigger mode then 1 2 3 4 5 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 in 3 23 DMM4020 Users Manual 3 24 To use the number editor l 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 Number Editor Options Low threshold limit for compare mode then d High threshold limit for compare mode then amp then 2 32 4 5 Relative base for relative readings modifier Press or amp to increment or decrement the highlighted digit to the desired number from 0 to 9 When the digit is set to the desired number press S1 through S6 to select the next digit to edit S1 corresponds to the left most digit and S6 corresponds to the right most digit Repeat this step until you have set all the digits to their desired value
25. 00 which sets bit 4 EXE in ESE to 1 Event Status Enable Query Meter returns the lt value gt of the Event Status Enable Register as set by the ESE command lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register Event Status Register Query Meter returns the lt value gt of the Event Status Register and then clears it lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register 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 Meter sets the Operation Complete bit in the Command Standard Event Status Register when parsed Operation Complete Query Meter places an ASCII 1 in the output queue when an eer o Reset Meier Meter performs power up reset power up reset Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4 8 Common Commands cont Oe name menge Service Request Enable Sets the Service Request Enable Register to lt value gt where lt value gt is an integer between 0 and 255 The value of bit 6 is ignored because the Service Request Enable Register does not use it lt value gt is an integer whose binary equivalent corresponds to the st
26. 1 Front Panel Features cont no EE 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 a Primary operation Selects relative readings function to display difference between relative base and input Second level operation Sets relative base a2 Primary operation Selects dB measurement mode Second level operation sets dB reference impedance 2 Stores the minimum and maximum inputs measured Selects measurement function Frequency DC voltage AC voltage DC current AC current Resistance ohms Continuity diode test toggles 5 GD Toggles between manual and autorange modes and increase and decrease the range for manual ranging Input terminal for 10 A ac and dc current measurement Input terminal for 200 mA ac and dc current measurement 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 The annunciators indicate measurement units and the Meter s operating configuration The dual display allows you to see two properties for the input si
27. 12 Measurement Queries 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 If the secondary display is off an Execution Error is generated MEAS If both displays are on Meter returns the value shown on both displays after the next triggered measurement is completed in the format selected See FORMAT command in Table 4 15 Refer to the following examples for each format Example of Format 1 1 2345E 0 6 7890E 3 lt CR gt lt LF gt Example of Format 2 1 2345E 0 VDC 6 7890E 3 ADC lt CR gt lt LF gt If the secondary display is not on MEAS is equivalent to MEAS1 Note If MEAS is used in external trigger TRIGGER 2 through TRIGGER 5 unexpected results will be obtained VAL1 Meter returns the value shown on the primary display If the primary display is blank the next triggered measurement is returned VAL2 Meter returns the value shown on the secondary display If the secondary display is blank the next triggered measurement is returned If the secondary display is off an Execution Error is generated VAL If both displays are on Meter returns the value shown on both displays in the format selected See FORMAT command in Table 4 15 Refer to the following examples for each format Example of Format 1 1 2345E 0 6 7890E 3 lt CR gt lt LF gt Example
28. 44 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 Non volatile Memory Space o we se Function 60 KB U44 Microprocessor Memory Application program storage 256 B U44 Microprocessor Memory Not used EEPROM 16 KB U45 IC Memory Calibration constants hardware setup and user configuration information To clear the volatile memory element listed in Table 1 1 and the non volatile user stored instrument front panel setups in Table 1 2 1 Toggle the power switch located on the rear panel power receptacle off and then on again to cycle the Meter power This will return the Meter to default settings 2 Power on the Meter by pressing on the front panel Press the button 4 Press the 61 _ through function keys in serial waiting several seconds before pressing each key This will restore the user front panel instrument setting memory locations to factory defaults 5 Press the button to exit shift mode 1 DMM4020 Users Manual Options and Accessories Table 1 3 lists available options and accessories Table 1 3 Accessories Model Part Description Number TL710 Premium Test Lead Set 196 3520 00 General Specifications Voltage 100V Setting 90 V to 110 V 120V Setting ee 108 V to 132 V 220V Setting 198 V to 242 V 240V Setting Ben 216 V to 264 V Fr
29. 99 mA 1 uA 10 uA 10 uA lt 0 5 V 2A 1 99999 A 10 pA 100 uA 100 uA lt 0 1 V 10A 10 0000 A 100 uA 1 mA 1 mA lt 0 5 V Introduction and Specifications Electrical Specifications Accuracy Uncertainty Range Temperature Coefficient C 90 days 1 year Outside 18 28 C 23 C 5 C 23 C 5 C 200 uA 0 02 0 005 0 03 0 005 0 003 0 001 2mA 0 015 0 005 0 02 0 005 0 002 0 001 20 mA 0 03 0 02 0 04 0 02 0 005 0 001 200 mA 0 02 0 005 0 03 0 008 0 005 0 001 2A 0 05 0 02 0 08 0 02 0 008 0 001 10A 0 18 0 01 0 2 0 01 0 008 0 001 Notes 1 Uncertainty given as of reading of range AC Current The following ac current specifications are for sinusoidal signals with amplitudes greater than 5 of range For inputs from 1 to 5 of range add an additional error of 0 1 of range Input Protection Measurement Method Shunt Resistance en 0 01 Q for 2 A and 10 A ranges AC Filter Bandwidth 1 Q for 20 mA and 200 mA 20 Hz 100 kHz Maximum Crest Factor aaaaeanaaaaeeeeeaaaaee 3 1 at Full Scale Additional Crest Factor Errors lt 100 Hz Crest Factor 1 2 0 05 of full scale Crest Factor 2 3 0 2 of full scale Only applies to non sinusoid signals Input Characteristics Tool accessible 11 A 1000 V and 440 mA 1000 V fuses AC coupled True RMS
30. AT Returns the format in use 1 or 2 PRINT lt rate gt Sets print rate for print mode See Table 4 2 SERIAL Returns Meter s serial number Table 4 16 Measurement Units Output with Format 2 e umso 4 25 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 REMS Puts the Meter into remote REMS state mode without front panel lockout is shown on the display RWLS Puts the Meter in remote with lockout state RWLS with front panel lockout and e are shown on the display When in RWLS all front panel buttons are disabled Puts the Meter is local state LOCS mode without lockout All front panel buttons are enabled Puts the Meter in local with lockout state LWLS mode All front panel buttons are disabled ep is shown on the display RS 232 Save Recall System Configurations Table 4 18 describes RS 232 save recall system configuration commands which are used with the RS 232 interface to set up the remote local configuration of the Meter Table 4 18 Save Call System Configuration Commands Save lt position gt Saves the current running working status into lt position gt where lt position gt is 1 ee te er
31. C Voltage Specifications AC Voltage specifications are for ac sinewave signals gt 5 of range For inputs from 1 to 5 of range and lt 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 Measurement Method AC Filter Bandwidth Common Mode Rejection 750 V rms or 1000 V peak or 8 x 10 Volts Hertz product AC coupled true rms Measures the ac component of input with up to 1000 V dc bias on any range Sg tege 20 Hz 100 kHz EE T 60 dB at 50 Hz or 60 Hz 1 kQ unbalance Maximum Crest Factor 3 1 at Full Scale Additional Crest Factor Errors lt 100 Hz Crest Factor 1 2 0 05 of full scale Crest Factor 2 3 0 2 of full scale Only applies for non sinusoid signals Input Characteristics Resolution Range Ful Scale Input Impedance 5 1 2 Digits Slow Medium Fast 200 mV 199 999 mV 1 uV 10 uV 10 uV 1 MQ 2 shunted by 2V 1 99999 V 10 uV 100 uV 100 uV lt 100 pf 20 V 19 9999 V 100 uV 1000 uV 1000 uV 200 V 199 999 V 1 mV 10 mV 10 mV 750 V 750 00 V 10 mV 100 mV 100 mV Accuracy Uncertainty TT Temperature Range Frequency 90 days 1 year Coefficient C 23 C 4 5 C 23 C 5 C Outside 18 28 C 200 mV 20 Hz 45 Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20
32. Panel Power Up Configuration e Touch Hold level 1 2 3 4 e Last recorded minimum and maximum values for MINMAX modifier e Last recorded relative base e Relative base shown in secondary display enabled or disabled e Last HI LO settings in compare mode e Trigger mode 1 2 3 4 5 e Echo setting on or off e dB and dB reference e RS 232 settings e PRINT mode e Data format with or without UNIT sending through the RS 232 Power Up Configuration When the Meter is turned on and the power up sequence is complete the Meter defaults to the power up configuration listed in Table 3 9 The RS 232 baud rate parity and echo mode are not changed when power is cycled off and on These parameters remain as set until changed by the user Table 3 9 Factory Power Up Configuration Pioonvanestrcengaemese con fo ie na mom aber nN m maaneo eat 0 Dei Calibration Refer to the DMM4020 Technical Reference for instructions on calibrating the Meter 3 25 DMM4020 Users Manual 3 26 Chapter 4 Operating the Meter Using the Computer Interface Title Page Intro Cuchi OD s 53552 s5dshsossvaaveradaca A a a E meouheananed 14 3 Local and Remote Operations ueeuesseesenessnnsneenneennsennnennnennneenne essen anne 14 3 Comp ter Interfaces essin engen kennen 14 3 Preparing the Meter for Operations via the RS 232 Interface 14 3 Setting Communication Parameters RS 29311 14 3 RS 232 Print Only Mode EE 4 4 Cablin
33. RET S 3 9 Factory Power Up Confeuraton nennen ernennen 4 1 RS 232 Communication Parameters Factory Senge 4 2 Print Rates in RS 232 Print Only Mode nenne 4 3 Trigger Lupp eebe A T a A 4 4 RS 232 Reading Transfer Rates cccecccccsseesseeseeessecsseesseceaeensecnseenseeeereneeeesnenaes 4 5 Status Register Summary 00 0 0 ecccecccecsceeseeeceescecscecssecsaeceaecnsecnseesseeeeeseeeseeeseneeeaes 4 6 Description of Bits in ESR and ESE cseneenenneennesnnnsnnnennnnnnennens nenne 4 7 Description of Bits in the Status Byte Register GIRA 4 8 Common Commande 4 9 Function Commands and Queries nennen 4 10 Function Modifier Commands and Queries c cccccccccssecesssccesseecseceessecesseecssees 4 11 Range and Measurement Rate Commands and Queries 4 12 Measurement Oueres 4 13 Compare Commands and Queries cccecccecssessseesseeseeeseecaeecaeecsseneeseeeseeeseneseneeeaes 4 14 Trigger Configuration Commands ccccccsccessecssecsseceeceseceseceseenseeneeeseeeseneeeneeeaes 4 15 Miscellaneous Commands and Queries cc ccccssccesseceessecesseecsscecsseceesseceeseeessees 4 16 Measurement Units Output with Format 7 4 17 Remote Local Configuration Commandes 4 18 Save Call System Configuration Commandes DMM4020 Users Manual vi List of Figures Figure Title Page 1 1 IEC 61010 Measurement Category CAT Levels 2 1 Replacing the Line Power use 2 2 Replacing the Current Inp
34. Tektronix 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 Contacting Tektronix Inc Tektronix Inc 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area 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 Parts modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance
35. XED Meter exits autoranging on the primary display and enters manual ranging The present range becomes the selected range 4 21 DMM4020 Users Manual Table 4 11 Range and Measurement Rate Commands and Queries cont RANGE lt value range gt Sets the primary display to lt value range gt where lt value range gt 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 Value Range Range Current Range Current Ce a om fa je fa RANGE1 Returns the range presently selected on the primary display RANGE2 Returns the range presently selected on the secondary display If the secondary display is inactive an Execution Error is generated RATE lt speed gt Sets the measurement rate to lt speed gt where lt speed gt is either S for slow 2 5 readings second M for medium 20 readings second or F for fast 100 readings second S M and F can be entered as uppercase or lowercase Any other entry for lt speed gt generates an Execution Error RATE Returns lt speed gt as S for slow 2 5 readings second M for medium 20 readings second or F for fast 100 readings second 4 22 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
36. able the settling delay or select trigger type 3 to enable the settling delay See Table 4 3 for typical settling delays When trigger type 2 or 3 is selected Ext Trig is displayed confirming that you are not in the remote mode and an external trigger is enabled If you are not in the remote mode you will not be able to trigger measurements from the front panel 3 Press to trigger a measurement Each time you press you trigger a measurement 4 To return the Meter to its internal continuous trigger state perform step 3 and select trigger type 1 4 9 DMM4020 Users Manual 4 10 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 Setting the Trigger Type Configuration To set the trigger type configuration using the computer interface enter the command TRIGGER lt type gt where lt type gt is the trigger type and press Enter See Table 4 3 for trigger types Select trigger type 3 or 5 to enable the settling delay if the input signal is not stable before a measurement is triggered Typical settling delays are provided in Table 4 3 RS 232 reading transfer
37. ads before use Do not use them if insulation is damaged or metal is exposed Check the test leads for continuity Replace damaged test leads before using the Meter B 1 DMM4020 Users Manual Accessories 1 13 B Bail Adjustment of Removal of 2 8 Calibration 3 24 Cleaning the Meter 2 9 Compliance Information 1 7 D Diode Tau Display 3 5 E Environmental Considerations Equipment Recycling 1 9 Restriction of Hazardous Substances 1 9 F Fluke 45 Emulation Mode Front Panel Features Function Sins Fuses Current Input Line Power l Impedances Reference 3 18 Installation in Equipment Rack 2 9 Index L Line Voltage Selection List and Number Editors 3 21 M Manuals 1 11 Measurement Frequency Resistance 3 9_ Voltage Power Cord A es 2 7 Power On Power Up Configuration 3 24 R Rear Panel Feature RS 232 Pin Out 3 16 S Safety General safety summa Symbols and Term Security Procedures Shift Button Second Level Operations 3 20 Specifications Electrical Environmental Storing Meter DMM4020 Users Manual T User Documentation Trigger Mode 3 15 W U Warranty Unpacking Meter 2 3
38. age gt 30 V Earth ground dc or ac peak might be present AC Alternating Current AE capacitance AC or DC Alternating or Direct Fuse Current Continuity test or continuity beeper Io Static awareness Static discharge Double insulated can damage parts Measurement Category II is for measurements performed on circuits directly connected to the low voltage installation Measurement Category is for measurements not directly connected to mains Introduction and Specifications 1 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 Electronic CAT II CAT III i Appliances MC Panels etc I I PCs TVs Service Entrance Outbuilding Entrance Underground Service Service Transformer Outbuilding Entrance Meter Underground Service I I Li Li Li Li Li 1 1 Li Li Li Li I Li Li Service Li Li Li 1 Li Li Li I Li Li l Li Li Li I 1 1 1 Li cat_levels eps Figure 1 1 IEC 61010 Measurement Category CAT Levels The IEC 61010 Measurement CAT level indicates the level of protection the instrument provides against impulse withstand voltage CAT I equipment is des
39. al Table A 2 Sample Dual Display Applications cont Primary Secondary Applications Display Display Resistance Select and sort resistors See also Using the Compare Function in Chapter 3 HOLD Actual Value Show actual measurement while holding a previous stable measurement on the primary display INPUT SENSE TEKTRONIX eer woe vor 2 gdb27 eps Figure A 2 DC Voltage and DC Current Measurement on Input Signal The lead from the internal measuring circuitry of the meter to the LO terminal on the front panel is the same for both voltage and current measurements The resistance of this lead is approximately 003 ohm If current is being measured therefore a voltage drop will occur in the resistance that is common to both circuits This internal resistance when added to the external resistance of the lead from the COM input terminal will affect the accuracy of the voltage reading For instance if the external lead resistance is 007 ohm the total common resistance is 010 ohm If there is 1 A of current the voltage reading would be affected by 1 A x 01 ohm 01 Vor 10 mV Depending on the circumstances this may be significant If you want to measure dc voltage on an input signal in the primary display and dc current in the secondary display proceed as follows 1 Turn the Meter on 2 Press to select the de voltage function for the
40. always displayed in a single fixed range with 0 001 dB resolution However the basic measurement itself volts ac for example autoranges 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 2 m und 2 Value 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 dBM Reference Impedances Voltage annunciator lit 7 Audio power readings possible To access the reference impedance list press then press The reference impedance currently selected is displayed along with the db and ohm annunciators Press or amp to scroll to the desired value then press to select a reference impedance and return the primary display to the measurement function Press any function or modifier button to exit the reference impedance list without selecting a new value Setting the dB reference resistance to 16 8 4 or 2 ohms allows you to use the Meter to calculate audio power After the reference resistance has been set to 16 8 4 or 2 ohms press twice to select the audio power modifier Power annunciator will be displayed The following equation is used to make a power calculation volts is the measurement value 2 Audio Power vos Ra To
41. ate 1 or 0 of bits in the register If lt value gt is not between 0 and 255 an Execution Error is generated Service Request Enable Meter returns the lt value gt of the Service Request Query Enable Register with bit 6 set to 0 lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register Read Status Byte Meter returns the lt value gt of the Status Byte with bit 6 as the Master Summary bit lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register TRG Trigger Causes the Meter to trigger a measurement when a e rer o Self test Self testquery Aways retums zero 0 returns zero Wait to Continue Do nothing Function Commands and Queries Table 4 9 describes function commands and queries Refer to Chapter 3 for detailed descriptions of each function Table 4 9 Function Commands and Queries Commands Primary Display Secondary Display AACDC Not applicable AC plus DC rms current DMM4020 Users Manual Table 4 9 Function Commands and Queries cont Commands Primary Display Secondary Display FUNC1 Not applicable Not applicable FUNC2 OHMS OHMS2 WIRE2 WIRE4 Not applicable VACDC TI Not applicable Meter returns function selected as command mnemonic For example if frequency is selected FUNC1 returns FREQ Meter returns function selected as command mnemonic For exa
42. be greater than 1 uV When making low level de measurements thermal voltages can present an additional source of error Thermal voltages can also cause problems in the low ohms ranges Some low value resistors are constructed with dissimilar metals Just handling such resistors can cause thermal voltages large enough to introduce measurement errors Use the following techniques to reduce the effect of thermal voltages 1 Use similar metals for connections wherever possible e g copper to copper gold to gold etc Use tight connections Use clean connection especially free of grease and dirt Use caution when handling the circuit under test N e d Wait for the circuit to reach thermal equilibrium Thermal voltages are generated only where there is a temperature gradient A 7 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 Traditional multimeters make these measurements using a shunt method shown in Figure A 3 The shunt resistor converts the current to be measured to a voltage which is called the burden voltage Since the internal impedance of the current source is in parallel with the shunt resistor the current flowing in the shun
43. cing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES W16 15AUG04 Table of Contents Chapter Title 1 Introduction and Specifications ccccccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeees General Safety Summary ainaisnraenianakanknnbeae To Avoid Fire or Personal Injury u uensesenessneseneesnnennenneennsenne nenne Symbols and Terms una deina edel Safety and Electrical Symbols nennen Description of IEC 61010 Measurement Categores eee Compliance Information en nne nenne EMG Compliance sanken EC Declaration of Conformity EMC eennnnennsennnennen Australia New Zealand Declaration of Conformity EMC Safety Complianees c acicasscsiecadacosnesondeduasanadenteonaccuneansceateseuecaeseondeaiesandaoenscanse EC Declaration of Conformity Low Voltage U S Nationally Recognized Testing Laboratory Listng Canadian Certification elek an Additional Complianc
44. days 1 year Coefficient C 23 C 5 C 23 C 5 C Outside 18 28 C 20 Hz 2 kHz 0 01 0 002 0 01 0 003 0 002 0 001 100 mV to 2 kHz 20 kHz 0 01 0 002 0 01 0 003 0 002 0 001 750 V 50 kHz 200 kHz 0 01 0 002 0 01 0 003 0 002 0 001 200 kHz 1 MHz 0 01 0 004 0 01 0 006 0 002 0 002 Notes 1 Input gt 100 mV 2 Limited to 8 10 V Hz Continuity Continuity Thresbold 20 Q Test Gurrent una 1mA R te tan ee aan Fast Maximum Reading 00a eee 199 99 Q Resolution isani ernennen naidaan 0 01 Q Diode Test Maximum Reading en 1 9999 V E WE 0 1 mV Chapter 2 Preparing the Meter for Operation Tint OCU e Unpacking and Inspecting the Meter Storing and Shipping the Meter Power Considerations scc sctssacesegdehescpasiatbes eiates dee Selecting the Line Voltage 0 ccccecscccssecsseceseceeceseceeeeseeeeaeecsuecuecsaecnaeenaeenes Replacing the Fuses acer edel Kun Line Power ET C rrent Inp t F ses n degen Connecting to Line Power parsiiieriineisrrea nrrainn a EE Ea EEE Ea Eais Turning Power On ua an nina NEE ESO Adjusting the UE Installing the Meter into an Equipment Rack Cleaning the Meter ssscssasstaceiacscncsnsesseceunecvaccunavans caaedodceansevodensetdhccaasate dE Fluke 45 Emulation Mode Illuminating All Display Begments nn ennn en 2 1 DMM4020 Users Manual 2 2 Preparing the Meter for Operation 2 Introduction Introd
45. e Table 2 1 Replace the protective cover by pushing it over the fuses while aligning the catches with the holes in the printed circuit board Press the cover down until the catches engage the printed circuit board Replace the fuse access door and install the retaining screw P N Bottom front left corner 2 6 eue04 eps Figure 2 2 Replacing the Current Input Fuses Preparing the Meter for Operation 2 Connecting to Line Power Connecting to Line Power AA Warning To avoid shock hazard connect the factory supplied three conductor 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 If a two conductor power cord must be used a protective grounding wire must be connected between the ground terminal and earth ground before connecting the power cord or operating the Meter 1 Verify that the line voltage selector block is set to the correct setting 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 Turning Power On 1 Ifrequired connect the Meter to line power q 2 Toggle the power switch on the rear panel so the TI side of the switch is depressed The M
46. e is ready for another command 2 gt Command error detected Command was not executed because it was not understood For example the Meter received an input string that contained a syntax error I gt Execution error or device dependent error detected Command was understood but not executed For example user attempted to use FREQ to perform a VDC measurement Getting Started with an Installation Test After the Meter is cabled to a host per Cabling the Meter to a Host or Printer RS 232 and is prepared to communicate with the host via the RS 232 interface test the system as follows to verify that it is operational Installation Test for RS 232 Operation 4 6 This procedure confirms that the Meter is properly set up and cabled for remote operations 1 Press to turn the Meter on 2 Verify that the computer interface parameters baud parity etc are set correctly 3 Turn the host on 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 Operating the Meter Using the Computer Interface How the Meter Processes Input 6 Ifthe 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
47. e precautions you would follow if you were making normal current measurements without a current clamp Table A 2 Sample Dual Display Applications Primary Secondary ere Display Display Applications Volts DC Volts AC e Monitor dc level and ac ripple of power supply Troubleshoot amplifier circuits Volts DC Current DC e Check power supply load regulation e Monitor UUT current draw and circuit voltages e Monitor loop current and voltage drop across transmitter Volts DC Current AC e Line and load regulation tests e dc ac or ac dc converters Volts AC Current DC e Line and load regulation tests e dc ac or ac dc converters Volts AC Current AC e Line and load regulation tests e Transformer magnetic circuit saturation Volts AC Frequency e Measure ac amplitude and frequency for line voltage and ac signal analysis e Measure frequency response of an amplifier e Adjust ac motor control e Read noise in telecommunication applications e Adjust portable power generator to optimize power output e Set frequency compensation for a network Current DC Current AC e Measure ripple and dc current draw of switching power supply e Measure current dissipation in protective fuse resistors used in power supplies e Measure ripple and noise on a line MN MX Actual Value e Show the minimum or maximum value recorded and the present measurement REL Actual Value e Show actual measurement and the difference between this value and the relative base DMM4020 Users Manu
48. e read using the STB command Table 4 7 Description of Bits in the Status Byte Register STB CO oo oa a ron ron a Message Available MAV Event Status ESB Data is available in output buffer Bit set to 1 when response to query placed in output buffer Bit cleared set to 0 when output terminator sent to host One or more of enabled events in the Event Status Register have occurred To determine which events have occurred send command ERR to read the Event Status Register Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4 7 Description of Bits in the Status Byte Register STB cont Tonne oe Conan OSOS Master Summary Status MSS TT Setto 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 Status of bit is returned by serial poll which clears RQS 1 As read by STB Command If the STB is read by a serial poll bit 6 is returned as RQS Reading the Status Byte Register The host reads the STB by taking a serial poll or sending the Meter a STB query The value of the status byte is not affected by the STB query When the STB is read an integer is returned This integer is the decimal equivalent of an 8 bit binary number For example 48 is the decimal equivalent ofthe binary
49. e reading as the high limit press and hold GD and y for 2 seconds To set the reading as the low limit press and hold and P for 2 seconds The Meter beeps to indicate the limit has been set If the display is blank or shows OL overload the limit could not be set and the high and low limits remain as previously set e Use the number editor as described in the Using the Number Editor section later in the chapter Before entering the number editor be sure you are in the appropriate range The decimal point and input range are fixed according to the range in the editor e Use the computer interface commands COMPHI and COMPLO to set the high and low compare points remotely See the Compare Commands and Queries section in Chapter 4 Using the Compare Function To select the compare function press GJ When the compare function is first selected the Touch Hold function is also activated and is displayed To turn off Touch Hold press and hold for 2 seconds The secondary display will then update with each new reading When a stable value is detected the Meter beeps if hold is on and the reading is shown in the primary display If the value is within the range you set PASS is shown in the secondary display If the value is not within the set range H or LO is shown as applicable in the secondary display List and Number Editors The Meter has a list editor and number editor The list editor allows you to scroll through and s
50. el 6 Call Call lt position gt Recalls the Recalls the working status from lt position gt where lt position gt is 1 through 6 status from lt position gt where lt position gt is 1 through 6 Sample Program Using the RS 232 Computer Interface Figure 4 4 is an annotated BASIC A program written for a PC that demonstrates how the Meter can be used with the RS 232 computer interface 4 26 Operating the Meter Using the Computer Interface 4 Sample Program Using the RS 232 Computer Interface EXAMPLE BAS The program to record magnitude and frequency data initialize RS 232 communication and set up F45 emulation check command acceptance by F45 display and record measurement data in TESTDATA PRN CLS KEY OFF RESULTS PROMPTS CMD INS ESCS CHR 27 COUNT 0 D Open port 9600 Baud no parity 8 bit data f ignore Clear to Send Data Set Ready Carrier Detect OPEN coml 9600 n 8 cs3 ds cd AS 1 IF ERRORCODE lt gt 0 THEN PRINT ERROR Could not open coml END OPEN testdata prn FOR OUTPUT AS 2 Open data file D Define data input Define string to hold command completion prompt SR Define string to hold command to Fluke 45 D D H Define input string Define program termination command string Initialize number of readings Set up F45 S rems Put F45 into Remote mode d vac Primary measurement is Volts AC d dB Add decibels modifier to primary measure
51. elect from a list of options The number editor allows you to enter or edit a numeric value Editing is performed in the primary display Normal operation of the Meter is interrupted when either editor is invoked If a computer interface command is received by the Meter during editing the edit is aborted and the Meter returns to normal operation The item being edited is not changed Operating the Meter from the Front Panel List and Number Editors 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 sr 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 Press amp or amp to step through the options Hold either button to scroll through the options As you step through the list only the selected option is shown in normal intensity bright while the others are dim 3 When the desired option is shown press DEZ to select it The selected option is then displayed in normal intensity bright Table 3 7 List Editor Options en Les open Lee Touch Hold minimum then 1 5 of range response level 2 7 of range 3 8 of range RS 232 print only mode 0 1 2 5 10 20 50 100 if RS 232 interface is 200 500 1000 200
52. equency OASE NEEN 47 Hz to 440 Hz Power Consumption ne 15 VA peak 10 W average Dimensions Phe LO EE 88 mm 3 46 in CU LEE 217 mm 8 56 in Depth RE 297 mm 11 7 in Weight ee eee eee tee 2 1 kg 4 6 Ib Introduction and Specifications 1 General Specifications Display Vacuum Fluorescent Display segment Environment Temperature Operating BEE 0 C to 50 C Eole e E anne taser 40 C to 70 C Warm Ups saccciccissene tecsteasencaesieessccsotvertecencrestes hour to full uncertainty specifications Relative Humidity non condensing Operating DEE lt 90 0 C to 28 C lt 75 28 C to 40 C lt 45 40 C to 50 C St FAGE brads ikisi 40 C to 70 C lt 95 Altitude Operating EE 2 000 Meters Te E 12 000 Meters Vibration Complies with MIL PRF 28800F Class 3 Triggering Trigger Delay 400 ms External Trigger Delay lt 2 ms External Trigger Jitter en lt 1 ms Trigger Input 0 0 0 0 eee eeceeeeceeeeeeeneeeeeeee TTL Levels Trigger Output 5 V max Math Functions Min max relative hold compare and dB functions Electrical Input Protection 1000 V all ranges OVGITANGE iiaii iiini iniri 10 on the largest ranges of all functions except continuity and diode test Remote Interfaces RS 232C Warranty Three years DMM4020 Users Manual Electrical Specifications Specifications are valid for 5 7 digit mode and after at leas
53. es cccecccesscseeseeeeeseeeseeeeceaeensecnaeenseeneeeeersenneeees Eg ipment Fy pe xsi ccctdsandesksdunlehandancbsaaceed N AA N ee Safety E Pollution Degree Description seeseeseerseenneesnenennenenenen nennen nn ne Pollution RE Measurement Overvoltage Categories Environmental Consideratons Product End of Life Handimg nenne Equipment Recycling ccccscssssssesssesseecssscesscesecesesseessseeseeesenesenasenessnes Restriction of Hazardous Substances cccceceesceseceeeeeeeeeeceaeeeeereeaeenee oe ee User Documentatie einser enet aE AEs ESSEE NAE ESK About this Manual Instrument Security Procedures uuunsesssesssennsennesnnennnennnnsnnnnennne nennen Volatile Memory sanken nee Non Volatile Memor Options and Accessories esseenssessnnsnensnnsnnnnennennsnnnnennnnnnnnnsennsennsennseensn nennen General Specifications ueseesseerseessnensnensnnsnnnnnnnnnnneennennnnnnnnnnnnnnnsnenne nn V Dimensions enee dee ee REI DMM4020 Users Manual Environment khleiisenasiikeiisseeiuen kernel TrIggenine un RER Inn BEIN ini Math Funetion8 einen een ein Electrical an ern u Rn Re Remote Interfaces u a area W en EE Electrical Specitications ccccccsssvedeizeachccarassaacaaadeideanseveceaseachseuasevacandasacdaneantace DC Voltage Specifications ccccccccscesseeessesscecseecssecesecnseceaeeseeseeeseeeeeneeses AC Voltage Specifications cccccescesscesscesscseeeeeeeesse
54. esseeeaeecseecaecnaeeeaeenaeees UE DE Curr Cin ET AG En Freguencya E Ou Diode Test EE 2 Preparing the Meter for Operation seen Tt UAC tegt ege Deen ee Unpacking and Inspecting the Meter Storing and Shipping the Meter Power Considerations 0 ecccecessseeececeeseeeeceseeseeeceaecaeeeeeaecaaeeaeeeecaeeaeeeeeaeeatees Selecting the Line Voltage seanoa ea a esse enne nn Replacing the Fuses ccccscecssessseesseeseecsseceecssecaecesecnseceaeenaeeneeeseeeseeeeeaeenaes Line Power uge nn eier Current Input Fuses itenei inii ienin in Connecting t Line Power iecoris oinn o R A A S Turning Power OD ausussseuisestiiien seisihensnennneesheentenn nalen Adjusting the Bail soseri ieaie ir a EE EROR EARN A ARE Installing the Meter into an Equipment Rack Cleaning the Meter Z ss Fluke 45 Emulation Mode Illuminating All Display Segmentz seese seessesessseesseseesessens 3 Operating the Meter from the Front Panel mtr Cti E Dual Display erene e R E R E E E E R R Primary Display EE Secondary usage esst deed Rear Pawel eene zat detese en eererdeeddee EE iaia Eed iia SEET Adjusting Meter Rah gcns osere e a E R e T Selecting a Measurement Rate Selecting a Measurement Function usecseesseerseersensnennennnnnnnennne essen nennen Measuring Voltage esse nne nn Me surng Frequency en sanken bares Frequency Ranging u a een nenn are Measuring Resistame siioni Enna E A 2 Wire Resistance Measurement sts seerossteseesee
55. eter will turn on and briefly illuminate all LCD segments Note To save on power consumption the Meter can be set to a standby mode by pressing on the front panel Press it again to bring the Meter up to full power 2 7 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 eue21 eps Figure 2 3 Bail Adjustment and Removal 2 8 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 To remove a boot stretch a corner then slide it off as shown in Figure 2 4 To install the Meter into the rack refer to the instructions provided with the Rack Mount Kit eue22 eps Figure 2 4 Boot Removal Cleaning the Meter AA Warning To avoid electric shock or damage to the Meter never get water inside
56. g the Meter to a Host or Printer RS 29371 14 5 Character Echoing and Deepen 4 6 Device Clear Using C CNTRL OCH 4 6 RS 232 Bomber dite 4 6 Getting Started with an Installation Test 4 6 Installation Test for RS 232 Operation ueseeessnesneesneenneenneennennnn nennen 14 6 If Test False een ones ieiene 4 7 How the Meter Processes Input 4 7 Inp t Str TEE 4 7 Input Ke Le 4 7 Sending Numeric Values to the Meter 14 8 Sending Command Strings to the Meter 4 8 How the Meter Processes Output 14 8 Triggering Output ui Aa SEENEN apa 4 9 External Triggering from the Front Panel 4 9 Setting the Trigger Type Configuration uesesesssesssensneennennnnnnnnnnnne nennen 4 10 External Trigger via the Computer Interface 4 10 Stat s Registers ENNEN PAOK ATEEN SAKENE KCE AEE SaNa 4 1 Event Status and Event Status Enable Registers ensenneeneenenenn 4 12 Status Byte Register nassen innen 4 14 Reading the Status Byte Register 14 15 Computer Interface Command Set 4 15 Common Commandes 4 16 Function Commands and Ouere 14 17 Function Modifier Commands and Queries ccccccscceessceessecessecesseeeees 4 19 Range and Measurement Rate Commands and Queries seseesseseeeeeeeee 4 21 4 1 DMM4020 Users Manual 4 2 Measurement Ouertes Compare Commands and Queries nennen Trigger Configuration Commande Miscellaneous Commands and Ouere RS 232 Remote
57. gnal you are measuring The Meter alternates between properties measuring the first property and showing it on one display and then measuring the second property and showing it on the other display For more detail see the How the Meter Takes Dual Display Measurements section in Appendix A If an input exceeds the full scale value of the selected range the Meter displays l to indicate an overload Primary Display The primary display comprises the lower segment of the dual display and consists of the larger digits and annunciators The primary display shows measurements taken using the relative readings REL minimum maximum MIN MAX Touch Hold HOLD and decibels dB function modifiers Secondary Display The secondary display comprises the upper segment of the dual display and consists of the smaller digits and annunciators Function modifiers REL HOLD MIN MAX and dB and the manual range mode cannot be selected for the secondary display The secondary display is either in autorange or the same range as the primary display if both displays are in the same function Q N D SPA ro eL RELA DIER MAX MIN Ext Trig Slow OOOOO0 Medium Fe 1 EI AL Error Eas 0 0 O00 anual Range Auto Range u ou u o V N Setup 7 LI N A UU IR A DR MKOKHZ g Q eue01f eps Figure 3 2 Display Annunciators and Indicators 3 6 Operating the Meter from the Front Panel Dual Display Table 3 2 Display Annu
58. h exponent HOLDCLR Meter exits Touch Hold and restores display to normal operation but does not exit the compare function Trigger Configuration Commands Table 4 14 describes the trigger configuration commands which set and return the trigger configuration Table 4 14 Trigger Configuration Commands TRIGGER lt type gt Sets the trigger configuration to lt type gt where lt type gt is the number in the Type column of Table 4 3 that corresponds with the applicable trigger rear trigger and setting delay If the lt type gt entered is not between 1 and 5 an Execution Error is generated Select a trigger type with settling delay enabled trigger type 3 or 5 when the input signal is not stable before a measurement is triggered Typical settling delays are provided in Table 4 3 TRIGGER Returns the trigger type set by the TRIGGER command 4 24 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 C CONTRL C Causes gt lt CR gt lt LF gt to be output FORMAT lt format gt Set output lt format gt 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 See Table 4 16 Format 2 primarily is used with RS 232 print only mode FORM
59. igned to protect against transients from high voltage low energy sources such as electronic circuits or a copy machine CAT H equipment is designed to protect against transients from energy consuming equipment supplied from the fixed installation such as TVs PCs portable tools and other household appliances CAT III equipment is designed to protect against transients in equipment in fixed equipment installations such as distribution panels feeders and short branch circuits and lighting systems in large buildings CAT IV equipment is designed to protect against transients from the primary supply level such as an electricity meter or an overhead or underground utility service 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 Compliance was demonstrated to the following specifications as listed in the Official Journal of the European Communities EN 61326 1 2006 EN 61326 2 2006 EMC requirements for electrical equipment for measurement control and laboratory use ee CISPR 11 2003 Radiated and conducted emissions Group 1 Class A IPC 61000 4 2 2001 Electrostatic discharge immun
60. intervening query the Meter will not respond to the second read e Rule 2 Read query responses before sending another command string Output data remains available in the output buffer until the host reads it or until the next command string is received by the Meter This means the host must read the Meter s output buffer before the next command string is sent to the Meter e Rule 3 The meter executes each command completely in the order received before moving on to the next command If an input string contains a trigger enter the commands in the following order 1 Commands to configure the Meter if any 2 The trigger command 3 Commands to read the result of a triggered measurement VAL or to reconfigure the instrument if any 4 The terminator Note IfMEAS MEAS1 or MEAS2 is used the command should follow Configure Trigger 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 lt CR gt lt LF gt After sending the Meter a command via the RS 232 interface wait for the Meter to return a prompt before sending another command Failure to do so causes a device dependent command error and the second string is discarded Numeric output from the Meter is shown
61. inuity Replace damaged test leads before using the Meter e Verify the Meter s operation by measuring a known voltage before and after using it Do not use the Meter if it operates abnormally Protection may be impaired If in doubt have the Meter serviced e Whenever it is likely that safety protection has been impaired make the Meter inoperative and secure it against any unintended operation e Servicing of the Meter should be performed by qualified service personnel e Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and earth ground e While in IEC Measurement Category Il environments do not apply voltages above 600 V ac to the input of the Meter See Description of IEC 61010 Measurement Categories later in this manual e Always use the power cord and connector appropriate for the voltage and outlet of the country or location in which you are working e Always use a power cord with a ground connection and ensure the ground is properly connected to the power distribution system e Remove test leads from the Meter before opening the case e Never remove the cover or open the case of the Meter without first removing it from the main power source 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
62. ithin a product Typically the internal environment inside a product is considered to be the same as the external Products should be used only in the environment for which they are rated Pollution Degree 1 No pollution or only dry nonconductive pollution occurs Products in this category are generally encapsulated hermetically sealed or located in clean rooms Pollution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensation must be expected This location is a typical office home environment Temporary condensation occurs only when the product is out of service 1 9 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 Note Rated for indoor use only Measurement Overvoltage Categories CAT I 1000V CAT II 600V Environmental Considerations This section provides information about the environmental impact of the product Product End of Life Handling Observe the following guidelines when recycling an instrument o
63. ity IPC 61000 4 3 2002 RF electromagnetic field immunity IPC 61000 4 4 2004 Electrical fast transient burst immunity TEC 61000 4 5 2001 Power line surge immunity IEC 61000 4 6 2003 Conducted RF immunity TEC 61000 4 11 2004 Voltage dips and interruptions immunity EN 61000 3 2 2006 AC power line harmonic emissions EN 61000 3 3 1995 Voltage changes fluctuations and flicker European Contact Tektronix UK Ltd Western Peninsula Western Road Bracknell RG12 1RF United Kingdom This product is intended for use in nonresidential areas only Use in residential areas may cause electromagnetic interference Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test object To ensure compliance with the EMC standards listed here high quality shielded interface cables should be used The specified tolerances of the lower ranges of the VAC function while subjected to the injected test signal 3 V rms over the frequency range of 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 IEC 61000 4 6 Performance Criterion C applied at the 0 250 cycle Voltage Interruption test levels IEC 61000 4 11 Intr
64. ity the Meter includes a carrying handle that also serves as a bail for bench top operation Some features provided by the Meter are e A dual vacuum fluorescent display that allows two properties of an input signal to be displayed at the same time e g ac voltage in one display and frequency in the other e 5 1 2 digit resolution e True rms ac e 2 4 wire resistance or patented 2x4 wire resistance measurement technique e 200 mV to 1000 Vdc range with uV sensitivity e 200 mV to 750 Vac rms with 1 uV sensitivity e 200 to 100 MQ with 1 mQ sensitivity e 200 pA to 10 Adc with I nA sensitivity e 20mA to 10 Aac with 100 nA sensitivity e Frequency measurements from 20 Hz to 1 MHz e Continuity and diode test e Measurement rates of 2 5 20 and 100 samples second slow medium and fast respectively e Front panel setup key for single key access to saved setups e A compare mode to determine if a measurement is within defined limits e Remote operation via the RS 232 interface e Closed case calibration no internal calibration adjustments 1 DMM4020 Users Manual User Documentation The user documentation for this Meter includes the following Safety and Installation Manual 071 2694 xx www Tektronix com Technical Reference 077 0365 xx Specifications and Performance z e Verification Users Manual This manual Available in the following languages www Tektronix com English 077 0364 xx French 077 0376 xx
65. kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 2V 20 Hz 45Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 20V 20 Hz 45 Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 200 V 20 Hz 45 Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 750 V 20 Hz 45Hz 0 8 0 05 0 9 0 05 0 01 0 005 45 Hz 20 kHz 0 15 0 05 0 2 0 05 0 01 0 005 20 kHz 50 kHz 0 3 0 05 0 35 0 05 0 01 0 005 50 kHz 100 kHz 0 8 0 05 0 9 0 05 0 05 0 01 Notes 1 Uncertainty given as of reading of range 1 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 Q for 2 wire resistance plus lead resistance Measurement Method Max Lead Resistance 4 wire ohms Input Protection other ranges Input Characteristics 1000 V on all ranges Current source referenced to LO input E 10 of range per lead for 200 Q 2 kQ ranges 1 KQ per lead on all
66. le measurement and updates both displays using that measurement or 2 it updates each display using a separate measurement Updating Primary and Secondary Displays with a Single Measurement The Meter takes a measurement and updates both displays using that measurement only when the measurement function is the same for both the primary and secondary displays This will happen for instance if Touch Hold with autoranging on is applied to a measurement function on the primary display and the same function is selected for the secondary display Appendices A 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 Taking Voltage and Current Measurements Using the Dual Display Most applications of the dual display listed in Table A 2 can be performed using a single set of test leads connected to the INPUT VQ gt HI and LO terminals However to measure the voltage and current of an input signal requires three leads Be sure that the voltage and current measurements share the same common as shown in Figure A 2 Then simply follow th
67. ment freq2 Secondary display measurement to be frequency a format 1 Data to be formatted without units CMD rems vac db freq2 format 1 GOSUB 1000 Send command and get response D LOCATE 1 1 PRINT Program to record Magnitude and Frequency data LOCATE 12 15 PRINT Magnitude Frequency LOCATE 25 10 PRIN Press any key to record Press ESC key to exit WHILE INS lt gt ESC PRINT 1 meas Request next measurement results ECHOS INPUTS LEN meas 2 1 Discard echoed command string LINE INPUT 1 RESULTS Get the measurements PROMPTS INPUT 5 1 Get the prompt trailing lt LF gt LOCATE 12 36 PRINT RESULTS Print the measurement result INS INKEYS Read the keyboard buffer If a key has been pressed record the data IF INS OR IN ESC THEN GOTO 450 PRINT 2 RESULTS Store data in Lotus PRN format COUNT COUNT 1 Increment number of readings LOCATE 13 32 PRINT COUNT Readings recorded ENDIF WEND LOCATE 14 1 PRINT Test Complete Data stored in TESTDATA PRN CLOSE 1 2 KEY ON END D Subroutine Command check Reads and discards echoed commands and checks for error response prompt The possible command responses are d e gt lt CR gt lt LF gt command successful gt lt CR gt lt LF gt command syntax error I gt lt CR gt lt LF gt command execution error H PRINT 1 CMDS ECHOS INPUTS LEN CMDS 2 1
68. mple if frequency is selected FUNC2 returns FREQ If secondary display is not in use an Execution Error is generated Only available in OHMS function Used to switch between 2 wire and 4 wire measurement AC volts AC plus dc rms volts DC volts 1 When AACDC or VACDC is selected no function can be selected for the secondary display An execution error is generated if attempted 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 For example the relative modifier REL causes the Meter to display the difference between a measured value and the relative base The results of function modifier commands are shown in the primary display only Table 4 10 Function Modifier Commands and Queries Meter enters decibels modifier Any reading shown in the primary display is in decibels An Execution Error is generated if the Meter is not in a volts ac and or dc function DBCLR Meter exits the decibels modifier and displays readings in normal units Also clears dB power REL and MIN MAX modifiers DBPOWER Meter enters dB Power modifier if the reference impedance is set to 2 4 8 or 16 ohms and a voltage function has been selected Otherwise an E
69. n 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 When using multiple modifiers the order in which you select the modifiers affects how the modes will respond For example if you are in minimum maximum mode if you press S the value currently displayed becomes the relative base Pressing then displays the difference between the minimum and maximum values Additionally if you are in the relative readings mode pressing displays the difference between the relative base and the minimum or maximum value as applicable Second Level Operations Using the SHIFT Button Pressing causes the next button pushed to perform its second level operation Second level operations are printed in red on their respective buttons When is pressed is displayed See Table 3 6 for descriptions of second level operations and the buttons used to invoke the operations Table 3 6 Second Level Operations nenn me ro then Edits relative base and places the Meter into relative readings mode see the List and Number Editor section later in this manual smer then Sets communication parameters RS 232 including baud rate parity
70. n lists to enter a relative base or to enter a high HI or low LO range for the compare mode Configure the computer interface RS 232 Send measurements directly to a printer or terminal through the RS 232 interface 3 3 DMM4020 Users Manual EKITRONIXN gt dB Ka ER E REFN REF TA E Figure 3 1 Front Panel gdb02 eps Table 3 1 Front Panel Features ep om en INPUT VO gt 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 1000 V dc is the maximum voltage rating between the INPUT HI and LO terminals SENSE 4WO HI LO 4 wire Ohms measurement sense terminal cD Compare function for determining if a reading falls within a designated range of values Si IS IS WS SS Se For storage and retrieval of up to six test configurations e CAL recessed button Calibrates Meter Activates deactivates standby mode for power savings Activates second level operation for function buttons Locks the front panel operation during remote mode Primary operation Selects Meter print mode Second level operation Sets RS 232 communication parameters baud rate parity echo Operating the Meter from the Front Panel Introduction 3
71. nciators and Indicators e RR oje fernen o K T 2 O Ee S Resistance measurement method selected 2 wire or 4 wire ER KEE Pa oma vain pin deney eroga 4 High voltage is detected Displays when voltage is gt 30 V dc or ac rms DMM4020 Users Manual Rear Panel See Figure 3 3 and Table 3 3 for an overview of the rear panel features CAUTION N FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE AS STATED IN MANUAL A 1 gA SLOW FUSE 100 120VAC 47 440 Hz A 146A SLOW FUSE 220 240 VAC 15 VA MAX RS232 RXD 2 RS232 TXD 3 r RS232 GND5 LR44340 WARNING TRIGIN 9 Go A TO AVOID ELECTRIC SHOCK SERIAL TAG TRIG OUT 6 5 VOUT 1 GROUNDING CONNECTOR IN POWER CORD NO IN ERNAL USER SERVICEABLE PARTS TERTRE CORPORATION MUST BE CONNECTED REFER SERV E TO QUALIFIED SERVICE PERSONNEL www tektronix com gdb03 eps Figure 3 3 Rear Panel Table 3 3 Rear Panel Features o oe O n y Line power terminal Connects Meter to power source via power cord Fuse holder and power line voltage Houses fuses re 1 8 A slow fuse 100 120 VAC 1 16 A slow fuse 220 240 VAC Provides means to select line power voltage 100 Vac 120 Vac 220 Vac 240 Vac RS 232 terminal RS 232 and External trigger terminal Connects Meter to a host serial printer or terminal and provides external trigger interface Grou
72. nd terminal Provides connection to ground 3 8 Operating the Meter from the Front Panel Adjusting Meter Range Adjusting Meter Range Ranging operations are performed using GB Band amp 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 If no higher range is available OL is displayed on the primary or secondary display to indicate an overload The Meter automatically selects a lower range when a reading is less than 95 of full scale of the lower range In autoranging mode pressing or amp changes the mode to manual ranging If is pressed the next higher range is selected if there is one If is pressed the next lower range is selected In manual ranging mode the range that is set when you enter the mode becomes the selected range The Meter remains in the selected range regardless of input Manual ranging can only be performed on readings shown on the primary display The secondary display is in autorange or when the primary and secondary displays are set to the same function the secondary display uses the same range as the primary display Selecting a Measurement Rate The Meter takes measurements at one of three user selected rates slow medium and fast Rate selection allows you
73. nder test as shown in Figure 3 10 The beeper emits a continuous tone if the input is below 20 Q To perform a diode or transistor junction test l 2 If required press to select the diode test function Connect the test leads between the Meter and the diode or transistor junction as shown in Figure 3 11 The forward voltage of the semiconductor junction or junctions is measured Readings are displayed in the 2 V range at the fast measurement rate The Meter displays OL if the input is above 2 V INPUT SENSE VA awn A A E iV CAT I 0 V CAT IT 1v eue15 eps Figure 3 10 Continuity Test INPUT SENSE var awn A A wend 1000V CAT asov MAX G00V Cari 300V W I eue16 eps Figure 3 11 Diode Test 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 See the Electrical Specifications section in Chapter 1 for information on this signal The following sections discuss triggering
74. nput characters are processed and executed space is made available in the input buffer for new characters In RS 232 applications if a communication error parity framing overrun is detected a device dependent error is generated and the input string is discarded If the Meter s input buffer becomes full when it is used with the RS 232 interface a device dependent error is generated see Event Status and Event Status Enable Register and the input string is discarded Valid terminators for the RS 232 interface are e CR Carriage Return e LF Line Feed e CRLF Carriage Return Line Feed 4 7 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 45 Sending Command Strings to the Meter Observe the following rules when you construct strings to be sent to the Meter over the computer interface e Rule 1 Read meter s output buffer once for each query command The Meter s output buffer is cleared after it has been read This prevents previously read data from being read a second time by mistake If you attempt to read the Meter s output buffer twice without an
75. nt including signal terminator is less than 2500 pf To connect the Meter to a personal computer with DB 9 connector use a modem cable To connect the Meter to a specific brand of RS 232 printer use the cable that would be used to connect that printer to an RS 232 port on a personal computer with a DB 9 connector 4 5 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 If you send a character to the Meter over the RS 232 interface directly from a keyboard pressing the lt BACKSPACE gt key deletes the previous character A backspace is echoed to the display screen if Echo is on Device Clear Using C CNTRL C C CNTRL C causes gt followed by a carriage return and line feed to be output RS 232 Prompts When the host sends a command to the Meter over the RS 232 interface the Meter parses the command executes it returns a response if appropriate and then sends one of the following prompts gt No errors detected Command was successfully parsed and executed The interfac
76. oduction and Specifications 1 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 Safety Compliance EC Declaration of Conformity Low Voltage Compliance was demonstrated to the following specification as listed in the Official Journal of the European Communities Low Voltage Directive 2006 95 EC EN 61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use U S Nationally Recognized Testing Laboratory Listing ISA 82 02 01 Safety Standard for Electrical and Electronic Test Measuring Controlling and Related Equipment General Requirements Canadian Certification CAN CSA C22 2 No 61010 1 2004 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 Additional Compliances TEC 61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use ANSI UL 61010 1 2004 2nd Edition Standard for electrical measuring and test equipment Equipment Type Test and measuring Safety Class Class 1 grounded product Pollution Degree Description A measure of the contaminants that could occur in the environment around and w
77. of Format 2 1 2345E 0 VDC 6 7890E 3 ADC lt CR gt lt LF gt If the secondary display is not on VAL is equivalent to VAL1 If a display is blank the next triggered measurement on that display or displays is returned 4 23 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 ED amp amp and amp on the front panel Table 4 13 Compare Commands and Queries COMP Meter enters compare COMP function Touch Hold is automatically turned on Touch Hold can be turned off with HOLDCLR command COMP Meter returns HI if the last COMP measurement reading was above the upper limit of the compare range LO if it was below the lower limit of the compare range PASS if within compare range or a dash if a measurement has not completed COMPCLR Meter exits compare function and Touch Hold if it is selected and restores display to normal operation COMPHI lt high value gt Sets HI compare COMP value to lt high value gt lt high value gt can be a signed integer signed real number without exponent or signed real number with exponent COMPLO lt low value gt Sets LO compare COMP value to lt low value gt lt low value gt can be a signed integer signed real number without exponent or signed real number wit
78. of e Read Using ESE Write to Using ESE Service Request Generation Figure 4 2 Overview of Status Data Structures Event Status and Event Status Enable Registers Event Status Register Read Using ESR Queue Not Empty Output Queue Read by Serial Poll Status Byte Register 4 Read Using STB Service Request Enable Register Read Using SRE Write to Using SRE aam21f eps 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 For example if bit 3 DDE is set to 1 a device dependent error has occurred The ESE is a mask register that allows the host to enable or disable mask each bit in the ESR When a bit in the ESE is set to 1 the corresponding bit in the ESR is enabled Operating the Meter Using the Computer Interface Status Registers 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 Power On Execution Error Standard Event Status Register ESR O User Request O1 Command Error CO Device Dependent Error N Query Error Request Control Operation Complete N Logical OR
79. ower Up Config ration u a in bu tens 13 25 Calibration n n een ern rent de beaded raven sou eine 3 25 3 1 DMM4020 Users Manual 3 2 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 The front panel has three main elements input terminals on the left dual display primary and secondary displays and keypad See Figure 3 1 for an overview of the front panel and refer to Table 3 1 for descriptions of the front panel features The front panel is used to Select a measurement function volts dc volts ac current dc current ac resistance frequency and diode continuity test for the primary and or secondary displays Take a measurement and display a reading Select the manual or autorange mode Manually select a measurement range for the primary display Select function modifiers that cause the Meter to display relative readings minimum or maximum values or to select the TouchHold function to hold a reading on the primary display Change the measurement rate slow medium fast Take a measurement and compare it against a tolerance range Use the editor to select from optio
80. ows 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 Trigger to uP eue24 eps Figure 3 12 External Trigger Circuit 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 To use a function modifier press a measurement function button to select that function and then press the function modifier button to modify that function For example press to select dc voltage measurement and then press to select the Touch Hold function to hold the results of your measurement Note that modified readings are shown on the primary display only After a function modifier is selected pressing any function button turns off all modifiers causes the secondary display to go blank and returns unmodified readings to the primary display Relative Readings Modifier REL The relative readings modifier displays the difference between the relative base and the input measurement For example if the relative base is 15 000 V and the present input measurement is 14 100 V the display will show 0 900 Readings are shown on the prima
81. primary display 3 Press then to select the de current function for the secondary display A Connect the leads to the test circuit as shown in Figure A 2 and read the measurements on the display Although current will be displayed as negative it is in fact positive when interpreted according to current flow convention Appendices A 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 not Measurements are either ac type ac volts or amps or dc type all others Typical response times for a single measurement are shown in Table A 3 For a single measurement results are displayed as soon as the correct range is found However additional time needs to be allowed for the measurement to be fully settled in order for the displayed result to meet the meter s accuracy specifications This settling delay varies depending on the differences between the primary and secondary displays The settling delay is longer when ac and dc type measurements are mixed Examples of mixed ac and
82. r component Equipment Recycling Production of this equipment required the extraction and use of natural resources The equipment may contain substances that could be harmful to the environment or human health if improperly handled at the product s end of life In order to avoid release of such substances into the environment and to reduce the use of natural resources we encourage you to recycle this product in an appropriate system that will ensure that most of the materials are reused or recycled appropriately This symbol indicates that this product complies with the applicable European Union requirements according to 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 Introduction and Specifications 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 For portabil
83. riin e E e E Ee Options and Accessories cccccesecesscessceeeceeeeeeseeeeeeeseecsaeeeaeceseeessecsaecaecsseenseenaeens General Specifications getest AN E A Kell RTE ET 1 1 DMM4020 Users Manual 1 2 Math Funttions e u 2 one A AAE R S leet EC Remote Interfaces eegene EE kiei aoe E E E E E E A A E Electrical Specihications n nenne nannte ererasnker DC Voltage Specifications AC Voltage Specifications Resistance nein E OEE A ERE ERS DE Current een E dene AC CUED eerste Seege EE PRE QUENCY EE COHUNUy eege cox these echessasexadeibecucecset eege ageleet ee RT RE Introduction and Specifications 1 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 Read the safety sections of the other component manuals for warnings and cautions related to operating the system This instrument has been designed and tested in accordance with the European standard publication EN 61010 1 2001 and U S Canadian standard publications UL 61010 1 and CAN CSA C22 2 No 61010 1 04 The instrument has been supplied in a safe condition This manual contains information and warnings that must be observed
84. ry display AA Warning To avoid electrical shock or damage to the Meter do not touch the input terminals or test leads during measurement Relative readings may not indicate the presence of dangerous voltages at the input terminals or test leads Note Relative readings modifier cannot be selected if the display shows OL overload or is blank To make a relative reading press to select the relative readings modifier The last valid reading taken is stored as the relative base the primary display zeroes out and RELA is shown on the primary display The secondary display is unaffected To edit the relative base use the number editor as described in the Using the Number Editor section later in this chapter Selecting the relative readings modifier turns off autoranging and locks the present range Make sure you are in the correct range before pressing 3E If you press amp or amp after pressing amp 1 the Meter exits the relative readings mode Decibels and Auto Power Modifier The decibels modifier takes a voltage measurement converts it to dBm measure of decibels relative to one milliwatt and displays the result on the primary display Press dB to toggle in and out of the decibels modifier When the decibels modifier is selected dB is shown on the primary display Decibels can be selected only when a voltage function is selected on the primary display volts ac volts dc or volts ac dc Decibels are
85. s When the value has been set press to toggle the sign between positive and negative If the sign is positive the negative sign is off If the sign is negative the negative sign is on For Low High threshold press to select the desired range for threshold values The range goes one step up by pressing DER once If the range reaches the top range the next press wraps back to range and the value will be cleared When you are finished editing the number press and hold DER for 2 seconds to store the value Function Keys ST S6 Function keys 1_ 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 To save the present configuration press and then press the function key to which you want to store the configuration To recall a configuration press the applicable function key A beep sounds when the configuration is ready for use and Setup indicates the number of the latest stored configuration When a configuration is stored it includes the following Measurement function and initial range on primary display Measurement function on secondary display Range mode on primary display manual or autorange Measurement rate slow medium fast Dual display status active or inactive Any combination of selected function modifiers Operating the Meter from the Front
86. s 1 Press to turn the Meter on Press Ai If the RS 232 interface is selected Print is shown and the list editor is invoked on the print rate list 2 Press amp or amp to scroll to the desired print rate as shown in Table 4 2 and press and hold GB for two seconds to select that rate Note that a print rate of 0 disables the print only mode The Meter is now configured for RS 232 print only operations The Meter exits the list editor and returns to normal operation Operating the Meter Using the Computer Interface 4 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 or po oor oa Jon fom os Joao oor fo fon keim foo fon po bal Jom f JL o fo fee Joe loo owe kal mo esr ke foar bon Joo _ 5 emo Iran bes ba ks Jo foe Cabling the Meter to a Host or Printer RS 232 The Meter communicates with a host through a DB 9 interface connector on the rear panel of the Meter A connector pinout for the RS 232 interface is provided on the rear of the Meter Note When connecting the Meter to the host or terminal use a cable appropriate to your application It is recommended that you use a cable that is less than 50 feet long 1 meters as this will help prevent performance degradation Longer cables can be used if the load capacitance at the interface poi
87. s or amp to step to the desired response level then press BER for two seconds to set the level and return to the primary display You can return to the primary display without changing the response level by pressing any button except GB amp or ER Minimum Maximum Modifier MIN MAX 3 20 The minimum maximum MIN MAX modifier stores the minimum and maximum inputs of your measurements Selecting the MIN MAX modifier turns off autoranging and locks in the present range so make sure you are in the correct range before pressing Mk If you press amp or amp after pressing Mk the Meter exits the MIN MAX modifier mode To store the minimum and maximum inputs 1 Press to select the MIN MAX modifier When is first pressed the minimum and maximum values are set to the reading displayed MAX is shown and the display indicates the latest maximum reading 2 Press again to display the minimum reading MIN is shown and the display indicates the latest minimum reading 3 Press again to display either the minimum or maximum reading is shown and the display indicates either the minimum or maximum reading 4 To exit MIN MAX mode press and hold for 2 seconds 5 To observe the actual readings without resetting the stored values press and then select the same measurement function that you selected for the primary display Operating the Meter from the Front Panel Selecting a Function Modifier Using the Function Modifiers i
88. 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 When making electrical connections connect the common test lead before connecting the live test lead when disconnecting disconnect the live test lead before disconnecting the common test lead Disconnect circuit power and discharge all high voltage capacitors before testing resistance continuity diodes or capacitance Before measuring current check the Meter s fuses and turn OFF power to the circuit before connecting the Meter to the circuit When servicing the Meter use only specified replacement parts 1 DMM4020 Users Manual Symbols and Terms The following terms and safety and electrical symbols may appear in the manual or on the product A AA Warning statement identifies conditions or practices that could result in injury or death A A Caution statement identifies conditions or practices that could result in damage to the Meter or equipment to which it is connected AA Warning To avoid electric shock personal injury or death carefully read the information under General Safety Summary before attempting to install use or service the Meter Safety and Electrical Symbols EE Important Display ON OFF and Meter reset information See manual Hazardous voltage Volt
89. s to select volts ac for the primary display Press then E to select frequency for the secondary display Insert the test lead probes into a wall socket The display will appear similar to Figure A 1 The actual display depends on the local power supply A 2 DMM4020 Users Manual Slow c i N N N Manual Range UI U 1 LI U rn LI LI gt lt O Print 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 de ac rms or current dc ac rms measurements can only be made in the primary display While dc ac measurements are being made another function cannot be selected for the secondary display Additional combinations of dual readings can be added by using the relative readings minimum maximum and or Touch Hold function modifiers Table A 1 Allowable Combinations of Measurements Primary Function Does ses sen a mea Las Tew x BE Zu BEE u BE GE BE c 2 oO 3 ire 2 e o Ka How the Meter Takes Dual Display Measurements When the Meter is in the dual display mode both the primary and secondary displays are on the Meter takes measurements and updates the displays in one of two ways 1 It takes a sing
90. scellaneous Commands and Ouere 14 26 iii DMM4020 Users Manual RS 232 Remote Local Configurations c cccscsseceseceteceeeceseeeeeeseeeeseeeees RS 232 Save Recall System Configurations cccccesceseseeeseeeeeeeeeeeesees Sample Program Using the RS 232 Computer Interface Appendices er E EE B 2X4 Test Leads ccc ciccccccccccccccccssssssscescescsesessssecesccsceesesssaeeeescesessssseesesees List of Tables Table Title lel Volatile Memory Space siwcivccssscciecdivecccaecdeveeviaescccvannedtesdcoancedaaneasevsaendaneaaseauersareesies 1 2 Non volatile Memory Space ccceccsecsseessecsseceeceseceseceseceseeeeeeseeeseeeseseesseeetaeeaaes 1 3 Accessorles n ansnnsre sanken cOuteaad ova EE E E ERa A E E Sa 2 1 Line Voltage to Fuse Rang 2 2 Line Power Cord Types Available from Tektronts 3 1 Front Panel Features cccccccccesccessceseceeeceeeceeseesseesseecseecsaecsaecnaeceaeenseeneeeeeeeseneeenes 3 2 Display Annunciators and Indicators ccceccceeseeesceeeeeeeeceeseecssecnsecnseenseeneeeeaes 3 3 Rear Panel Features uer0ureneesersorsonnnnennennensosnnsnnnnnnnsnnennnnnnsnensersorsnnnsnennennanensene 4 RS 232 Pin Out E eeh EIERE eebe ger ehe 3 6 Second Level Operations cccccccsccesseessecseceeceseceseceseceseeeeeeseeeeeeeeeseesseeeeeeeeenaes 327 List Editor Options etuehinetecvd suanetoteandeensauisQeuseandeenseantPevecers s 3 8 Number Editor OPONSE R
91. scessceseeeeeceeeeeeceeeseeeseecssecsaeesaecnuecnsecneenaeeaes EMC emgesat eege ea nn EC Declaration of Conformity EMC censsssnennsenseenseensennn en Australia New Zealand Declaration of Conformity EMC Safety Compliance si cccsicsdecdsscdesdsnatiedeene ed evecdideevaasundeusibdeceeadeasteessveecaessdealeceizs EC Declaration of Conformity Low Voltage U S Nationally Recognized Testing Laboratory Listing s0 0s10s0ss00000 Canadian Certification ssori arai e Ea a ERRE E e Additional Compliances cccccccesssesseeeseeeceeceeseenseeeeeseeeeeeeeeseeeseeesseesaes Eguipment Type n 2 u wesen CHEN Pollution Degree Description sesssesssessnessnensnennennennnsennne essen ernennen Pollution ETS EE Measurement Overvoltage Categories c ccesccesscessceeeeeeeeeeeeeeseeeseeeeeeaaes Environmental Considerations ccccesessseseceseeseeeecesecaeeeeeesecaeeaeeeeceaeeaeeeneeaeenee Product End of Life Handimg ccc ceccescceseceseceeeceeeceeeeeeeeeeseesseeeseeeseeeaees Equipment Recycling cccccccccssecssecsseceeceeceecseeeeeeseeeseeeseneeeseesseeseeesaees Restriction of Hazardous Substances 0 cecceseescesecseeeeeeeeeeceeeeeeeeeceseeaeees Introd ction E User Dociimiemtati soiets saa EE About this Manual Instrument Security Procedures uunsesssessseensensnensnensnennennennsennse esse ernennen V Olatile Memory sand coviceincesteddes spbteieetss Non Volatile Memory c
92. sesets 4 Wire Resistance Measurement eeose stssteressteseeseesesets Meas ring Current neuere een weinen Automatic Input Terminal Detecton ccceecceescescceseeseenseeesecneenteeneenes Diode Continuity Testing en nnseneenne Making a Triggered Measurement nenne Setting the Trigger Mode Connecting to an External Trigger cccccccssecsseceseceseceseeeeeeeeeeeeeeeeneennes il Contents continued Selecting a Function Modifier ccccccsccsseceseceseceeeceseceeeeseeeseeeseseesseeseesseeeaees Relative Readings Modifier BEL Decibels and Auto Power Modifier ccccecssesseceseceseceeeeeeeeeeeseeeeeeeseeeeaes Touch Hold Function OHOL Di Minimum Maximum Modifier MIN MAN Using the Function Modifiers in Combunapon Second Level Operations Using the SHIFT Button Compare Function COMP nennen Setting the Compare Range Using the Compare Functon en nnsenne nn List and Number dttorz niis Using the List Edif r u aaa a na Using the Number Editor Function Keys Sl tude edd Een Power Up Confeuratnon t EE Operating the Meter Using the Computer Interface Introduction EE 4 4 Local and Remote Operations 0 cccccecsseesseesteceteceeceseceseenseeeeeeseeeeeeeeeneenaes 14 4 Comp ter Interfaces aussen nennt 4 4 Preparing the Meter for Operations via the RS 232 Interface 4 4 Setting Communication Parameters RS 232 u een 4 4 RS 232 Print Only Mode ccssscsssscssesscs
93. sssescsssssesssesecssucscssnsscesnseeesssvecssevsessnsecs 4 5 Cabling the Meter to a Host or Printer RS 23721 4 6 Character Echoing and Deepen 4 7 Device Clear Using C CNTRL CH 4 7 RS 232 ee 4 7 Getting Started with an Installation Test esenenenenennennn 4 7 Installation Test for RS 232 Operation cccccecssecssecsteseeceeeceeeeeeeeeseeeeneeenes 4 7 If Test EE 4 8 How the Meter Processes Input 4 8 dee ee 4 8 Input Ferm EE 4 8 Sending Numeric Values to the Meter 4 9 Sending Command Strings to the Meter 4 9 How the Meter Processes Output 4 9 Triggering Output u san Tania 14 10 External Triggering from the Front Panel 14 10 Setting the Trigger Type Configuration cccceeceeceseeereeceeeeceeeeeeeeeeeaeeaeees 4 1 External Trigger via the Computer Interface 4 11 Stats EE 14 12 Event Status and Event Status Enable Registers c ccsccsscssceteeeseeeeeeeees 14 13 Status Byte Register as a nal Reken 4 15 Reading the Status Byte Register 14 16 Computer Interface Command Set 14 16 Common Commandes 14 17 Function Commands and Oueres 14 18 Function Modifier Commands and Queries cccccccssscesssceessecessecesseeensees 14 20 Range and Measurement Rate Commands and Ouentes 14 22 eenegen 4 24 Compare Commands and Queries uuussssssssnnsennnennnennennnnnnnnene nennen 14 25 Trigger Configuration Commande 4 25 Mi
94. t 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 kQ unbalance Normal Mode Rejection 80 dB at Slow Rate A D Nonlinearity nn 15 ppm of range Input Bias Current een lt 30 pA at 25 C Settling Considerations eee Measurement settling times are affected by source impedance cable dielectric characteristics and input signal changes Input Characteristics Range Eu Seale on Input Impedance 5 1 2 Digits Slow Medium Fast 200 mV 199 999 mV 1uV 10 uV 10 uV gt 10 Go 2V 1 99999 V 10 uV 100 uV 100 uV gt 10 Go 20 V 19 9999 V 100 uV 1000 uV 1000 uV 10 MOL 200 V 199 999 V 1mV 10 mV 10 mV 10 MQ 1 1000 V 1000 00 V 10 mV 100 mV 100 mV 10 MQ 1 Notes 1 At some dual display measurements the input impedance of 200 mV and 2 V ranges may be changed to 10 MQ Accuracy Uncertainty Di u Range GE EE Veit ge EE utside 18 28 C 23 C 5 C 23 C 5 C 200 mV 0 01 0 003 0 015 0 004 0 0015 0 0005 2V 0 01 0 002 0 015 0 003 0 001 0 0005 20 V 0 01 0 003 0 015 0 004 0 0020 0 0005 200 V 0 01 0 002 0 015 0 003 0 0015 0 0005 1000 V 0 01 0 002 0 015 0 003 0 0015 0 0005 Notes 1 Uncertainty given as of reading of range Introduction and Specifications Electrical Specifications A
95. t resistor is less than the actual value thus causing an error Rinternal Vout eue28 eps Figure A 3 Shunt Method of Low Level Current Measurement Another method of low current measurement is the feedback resistor method shown in Figure A 4 The feedback resistor converts the current to be measured into a voltage The high gain operational amplifier forces the burden voltage to approximately zero and thus reduces the error associated with the simple shunt measurement approach The zero burden voltage measurement method used in the Meter gives a more accurate measurement of low level leakage currents Rreedback eue29 eps Figure A 4 Zero Burden Voltage Low Level Current Measurement 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 Ground tal caw061 eps Figure B 1 2X4 Wire Test Leads AA Warning To avoid electric shock and possible damage to the Meter use the 2X4 Wire test leads as specified in this manual Inspect the test le
96. ter 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 MAXSET lt numeric value gt Meter enters MAX modifier with lt numeric value gt as the maximum value lt numeric value gt can be a signed integer signed real number without exponent or signed real number with exponent Autoranging is disabled See Minimum Maximum Modifier MIN MAX in Chapter 3 for more information If lt numeric value gt exceeds the measurement range an Execution Error is generated Meter enters MIN modifier with present reading as minimum value If already in MIN modifier Meter displays minimum value In MIN modifier autoranging is disabled See Minimum Maximum Modifier MIN MAX in Chapter 3 for more information MINSET lt numeric value gt Meter enters MIN modifier with lt numeric value gt as the minimum value lt numeric value gt can be a signed integer signed real number without exponent or signed real number with exponent Autoranging is disabled See Minimum Maximum Modifier MIN MAX in Chapter 3 for more information If lt numeric value gt exceeds the measurement range an Execution Error is generated Meter enters MIN MAX modifier with present reading as minimum and maximum value If already in MIN MAX modifier Meter displa
97. ter enters the relative readings modifier REL using the value shown on the primary display as the relative base Autoranging is disabled See Relative Readings Modifier RELY in Chapter 3 for more information RELCLR Meter exits REL modifier and returns to the ranging mode and range selected prior to selecting REL RELSET lt relative base gt Meter enters REL modifier using lt relative base gt as the offset lt relative base gt value lt relative base gt can be a signed integer signed real number without exponent or signed real number with exponent Autoranging is disabled If lt relative base gt exceeds the measurement range an Execution Error is generated See Relative Readings Modifier REL in Chapter 3 for more information RELSET Meter returns lt relative base gt If the relative modifier has not been selected an Execution Error is generated Range and Measurement Rate Commands and Queries Table 4 11 describes range and measurement rate commands and queries In autorange mode the Meter automatically selects a range for each reading In manual range mode the user selects a fixed range Table 4 11 Range and Measurement Rate Commands and Queries Meter enters the autoranging mode on the primary display If autorange mode cannot be selected if REL MIN MAX or diode continuity test is selected an Execution Error is generated AUTO Meter returns 1 if it is in autorange or 0 if not in autorange FI
98. that can be integrated into an automated instrumentation system Preparing the Meter for Operations via the RS 232 Interface The RS 232 interface allows ASCII asynchronous serial communication between the Meter and a host serial printer or terminal Setting Communication Parameters RS 232 Table 4 1 provides the RS 232 communication parameters factory settings Setting RS 232 communication parameters is only performed through the front panel In order for the Meter and host to communicate via the RS 232 interface the communication parameters of the Meter must match those of the host If the communications parameters of the host and Meter do not match set the appropriate baud rate and parity parameters as follows 1 Press to turn the Meter on 2 Press then fats The baud rate currently selected is shown in the primary display and bdud is shown in the secondary display 3 Press or amp to scroll to the desired baud and then press EB to set the RS 232 baud rate 4 Press amp or amp to scroll to the desired data bit 7 or 8 selection then press DER to set parity Echo appears on the secondary display and Gn or OFF appears on the primary display 5 To select an Echo mode press amp amp or amp to select On or OFF and then press GENS to set the selected Echo state When Echo is on each command sent to the Meter over the RS 232 interface is echoed to the host s display screen When Echo is off commands are
99. the Meter A Caution To avoid damaging the Meter s housing do not apply solvents to the Meter If the Meter requires cleaning wipe it down with a cloth that is lightly dampened with water or a mild detergent Do not use aromatic hydrocarbons alcohol chlorinated solvents or methanol based fluids when wiping down the Meter 2 9 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 GD and for two seconds 2 Press amp or amp to scroll between 4020 and Fluke 45 The presently selected mode will appear bright in the display while the other is dim 3 Press DER to set the mode and reset the Meter Illuminating All Display Segments To illuminate all display segments start with the Meter display off Next press and hold then press to turn on the Meter Release the buttons when the display illuminates To return to normal measurement mode press 2 10 Chapter 3 Operating the Meter from the Front Panel Title Page Or We MEET 3 3 Dual Display cvvvsicacsedesss cosdecvaas cctbbaasecaicostedssvs sancestdd deed niedeaceisestadesva cous oiveabeedsteceest bs 3 6 Primary KEE 3 6 Secondary Displays anne 3 6 Rear bone eise sees 3 8 Adjusting Meter Range 3 9 Selecting a Measurement Rate 13 9 Selecting a Measurement Functnon
100. the Meter automatically using its internal trigger or externally using the trigger key on the front panel and the trigger terminal on the rear panel Setting the Trigger Mode There are five possible sources for triggering a measurement e Mode is automatic Measurements are triggered internally and are continuous and occur as fast as the configuration will allow e Mode 2 is triggered without delay using e e Mode 3 is triggered with delay using ae e Mode 4 is triggered without delay by an external signal e Mode 5 is triggered with delay by an external signal To select a trigger source 1 Press then 5 2 Press dh or amp to choose the trigger mode 3 Press and hold for 2 seconds to save the selected mode Connecting to an External Trigger The Meter provides two external trigger connection methods for different operation modes Table 3 4 shows the layout of the TRIG IO_RS232 connector An external TTL signal on pin 9 will trigger a measurement cycle Alternatively pin 9 of the RS 232 interface can be connected to pin 1 through an external switch See Figure 3 12 A measurement cycle is trigger when the switch is closed and the 5 volts from pin 1 is applied to pin 9 The trigger event occurs on the rising edge of the signal applied to pin 9 Operating the Meter from the Front Panel Selecting a Measurement Function Table 3 4 RS 232 Pin Out eue23 eps rn ooann O neen leen Figure 3 12 sh
101. to keep the instrument in a safe condition and ensure safe operation To use the instrument correctly and safely read and follow the precautions in this section and follow all the safety instructions or warnings given throughout this manual that relate to specific measurement functions In addition follow all generally accepted safety practices and procedures required when working with and around electricity CAT I equipment is designed to protect against transients from high voltage low energy sources such as electronic circuits or a copy machine CAT II equipment is designed to protect against transients from energy consuming equipment supplied from the fixed installtion such as TVs PCs portable tools and other houseshold appliances To Avoid Fire or Personal Injury Use Proper Power Cord Use only the power cord specified for this product and certified for the country of use Use Proper Voltage Setting Before applying power ensure that the line selector is in the proper position for the source being used Connect and Disconnect Properly Do not connect or disconnect probes or test leads while they are connected to a voltage source Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded
102. torange a new measurement from the lowest to the highest range and to display the result z Typical time to change to the next higher or lower range and display the result Table A 4 Typical Settling Delays in Seconds Meas Settling Delay Function Appendices A Applications Table A 5 Typical Measurement Intervals in Seconds for Dual Display Measurements Meas Bange Function g 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 When external trigger is enabled the meter determines the ranges for the primary and secondary if enabled displays based on the input at that time The meter is then ready to begin measuring the input on the optimum range as soon as the trigger is received If the input changes so that either display autoranges after the trigger is received the autoranging response times as shown in Table A 3 may be required before each measurement result is displayed The rear panel trigger input is edge sensitive A low to high pulse above 3 V will be recognized as a trigger less than 3 ms Thermal Voltages Thermal voltages are the thermovoltaic potentials generated at the junction between dissimilar metals Thermal voltages typically occur at binding posts and can
103. uch Hold Function HOLD The Touch Hold function holds the results of your measurements on the display Touch Hold is helpful in difficult or hazardous circumstances when you want to keep your eyes fixed on the probes and reading the display only when it is safe or convenient to do so When a new stable reading is detected a beep is emitted and the display is automatically updated To select the Touch Hold function press KSE is displayed In Touch Hold each time you press anew reading is displayed To exit the Touch Hold function press and hold ffs for 2 seconds 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 for less than 2 seconds The Meter allows you to choose the minimum response level needed for Touch Hold to capture and display a measurement You can choose from the following four response levels e Level 1 5 of range e Level 2 7 of range e Level 3 8 of range To change the response level press and fgs The response level currently selected 1 2 3 or 4 appears on the primary display Pres
104. uction 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 If the Meter has been subject to excessive handling in transit there may be visible external damage to the shipping carton In the event of damage keep the shipping container and packing material for the carrier s inspection 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 Storing and Shipping the Meter To prepare the Meter for storage or shipping place it inside a sealed bag fit the bag into the packing material inside the original shipping container and then secure the package Use the original shipping container if possible as it provides shock isolation for normal handling operations If the original shipping container is not available use a box that is 17 5 x 15 5 x 8 0 inches with cushioning material that fills the space between the Meter and the sides of the box
105. ut Fuses nennen 2 3 Bail Adjustment and Removal ccccccccccsseesseesecseceseceseceseceseeseeeneeeseeeeereneneeenes 2 4 Boot Removal cs norena R T cans calecsanensdeanansauces Sal Front Panele EE 3 2 Display Annunciators and Indicators eeenseesseenseennennneennenennnnnnnnnennnnnse nenne 3 32 Rear E 3 4 Voltage and Frequency Measurement nn 3 5 2 Wire Resistance Measurement ns 3 6 4 Wire Resistance Measurement nn 3 7 Input Connections for 4 Wire Ohms Using 2x4 Wire Leads 3 8 Current Measurement lt 200 m 3 9 Current Measurement 200 mA ol0Aa 3 10 Continuity Testseite A E ee SoU DiodeTest un seneaee ae an nase E teen 3 12 External Trigger Circuit deinen Ee 4 1 External Trigger Using Pin 9 of RS 232 Interface 4 2 Overview of Status Data Structures escnssenssenssennnennnennennnennneennnn nennen en nnne 4 3 Event Status and Event Status Enable Registerg nenn 4 4 Sample Program for RS 232 Computer Interface vii DMM4020 Users Manual viii Chapter 1 Introduction and Specifications Title Page General Safety Summary cccccccccssecsteceteceneceeceseeeseeeseecseecseecasecsaeenseceaeenseenes To Avoid Fire or Personal Injury cccceccceeseeeceeeneeeeeeeeeseeeseeesaeenseenaeens Klee E Safety and Electrical Symbols ccccccccesceeseeeeeeseeeecsecssecssecsseceseeneeees Description of IEC 61010 Measurement Categortes Compliance Information ccccccescces
106. x4 wire resistance measurement and displays 4 Wire at 4 wire resistance measurement Operating the Meter from the Front Panel Selecting a Measurement Function 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 Ifrequired press to select 2 wire resistance measurement mode 2 4 Wire is displayed The function and measurement are displayed INPUT SENSE VA mh awn A A HI wm 1000V CAT sov MAX Go0V Car 300V 1v eue11 eps Figure 3 5 2 Wire Resistance Measurement 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 Hl and LO connectors of the meter To perform a 4 wire resistance measurement using four test leads 1 Connect test leads between the Meter and the circuit under test as shown in Figure 3 6 2 Ifrequired press to select 4 wire resistance measurement mode 4 Wire is displayed The function and measurement are displayed G a SE KAS Kee si i DN LO 1 MAX A WW s Mr A P SE
107. xecution Error is generated In dB Power readings shown in the primary display are in Watts DBREF lt value gt Set dB reference impedance to a lt value gt shown in Table 4 10A This value corresponds to the reference impedance ohms indicated If lt value gt is not a value in Table 4 10A an Execution Error is generated Table 4 10A Reference Impedance Values Ref Impedance Ref Impedance 2 12 150 13 250 14 300 15 500 16 600 17 800 18 900 19 1000 20 1200 21 8000 1 2 3 4 5 6 7 8 9 PER O DBREF Meter returns a lt value gt shown in Table 4 10A This value corresponds to the reference impedance indicated HOLD Meter enters Touch Hold function See Touch Hold Function HOLD in Chapter 3 for more information If HOLD is sent when the Meter is already in Touch Hold a reading is forced and shown on the display HOLDCLR Meter exits Touch Hold and restores display to normal operation HOLDTHRESH Sets HOLD measurement threshold to lt threshold gt siieetielas lt threshold gt must be 1 2 3 or 4 0 01 0 1 1 or 10 respectively Any other value generates an Execution Error See Touch Hold Function HOLD in Chapter 3 for more information DMM4020 Users Manual Table 4 10 Function Modifier Commands and Queries cont HOLDTHRESH Meter returns Touch Hold lt threshold gt 1 2 3 or 4 See Touch Hold Function HOLD in Chapter 3 for more information MAX Me
108. ys latest MIN or MAX value In MIN MAX modifier autoranging is disabled See Minimum Maximum Modifier MIN MAX in Chapter 3 for more information When the MIN MAX modifier is selected you can toggle between displaying the minimum and maximum readings without losing the minimum and maximum values stored MNMXSET lt numeric1 Meter enters MIN MAX modifier with lt numeric1 gt as the maximum value and numeric2 gt lt numeric2 gt as the minimum value lt numeric1 gt and lt numeric2 gt can be signed integer signed real number without exponent or signed real number with exponent Autoranging is disabled See Minimum Maximum Modifier MIN MAX in Chapter 3 for more information If lt numeric1 gt or lt numeric2 gt exceeds the measurement range an Execution Error is generated Meter exits the MN MX modifier The stored minimum and maximum values are lost and the Meter returns to the ranging mode and range selected prior to selecting MN MX modifier 4 20 Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4 10 Function Modifier Commands and Queries cont 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 Me

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