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1. Note Source current flows from the INPUT HI to INPUT LO terminals Figure 3 10 41 3 6 Diode Measurements M3500A uses a current source of 1 mA for diode testing The maximum resolution is 10 on a fixed range of 1 V DC The default threshold voltage is fixed between 0 3 and 0 8 volts and the reading rate is fixed at 0 1 PLC The voltage bound is adjustable from 0 01V up to 1 2V A Beep sound will appear when the diode measured value is in the range Warning Positive end of the source signal is to be cennected to of the input terminals and the negative end to LO of the input terminals How to measure diode D Selects input signal connections on front or rear panel 2 Connect the diode to the terminals For forward bias connect the probe from input terminal HI to the positive end of the diode and connect the probe from input terminal LO to the negative end of the diode 3 Set voltage bound via pressing CONFIG SHIFT CONT buttons When ready press ENTER Or skip this step if you wish to use the default voltage bound Press SHIFT CONT buttons to select the diode testing function and observe the reading on the display PICOTEST M3500A Zener General purpose diode diode Note Source current flows from the INPUT HI to INPUT LO terminals Figure 3 11 42 3 7 Tempera
2. ENTER IE Figure 4 2 Remote I nterface Operation From your PC terminal use the following command to specify the filter type DETector BANDwidth 3 20 200 N MAX 4 1 2 2 Digital Filter Definition M3500A uses an averaging digital filter to yield a reading for display from a specified number of measurement readings in the past The past measurement readings are stored in a stack of memory The number may be in the range of 2 to 100 User may select one of the two modes of digital filter operations Moving Average and Repeating Average The moving average filter puts the specified number of reading conversions in a first in first out order The very first measurement reading simply fills up the stack To yield a reading for display the filter produces an average of the stacked measurement readings every time a new measurement reading is available and replaces the oldest reading in 55 the stack In the repeating average mode the multimeter waits for the measurement reading stack to fill up and then take an average to produce a reading for display It then flushes the stack and starts over with an empty stack Consequently the repeating digital filter yields one reading for display every specified number of measurement readings Digital filter is not available for diode continuity frequency and period measurements Default The digital filter is enabled and is in
3. 157 9 The SCPI Status Pattern 159 C 10 Status Reporting Commands esse 167 C 11 SCPI Compliance 169 12 IEEE 488 Compliance nformation sss 171 D ABOUT APPLICATION PROGRAMS 173 1 General Information This section contains general information about PICOTEST M3500A Multimeter The information is shown below Feature Overview Warranty Information Safety Information Symbols and Terms Specifications Inspection Options and Accessories If you have any questions after reading this information please contact your local service representative 1 1 Feature Overview M3500A is a 6 5 digit digital multimeter It has 0 001596 24 hour basic DC voltage accuracy at 10V range and 0 00296 24 hour basic resistance accuracy at 10kO range At 6 5 digit the multimeter delivers 50 triggered RDGS sec via remote interface At the fast 4 5 digit it reads over 2000 RDGS sec into its internal buffer M3500A provides wide measurement ranges X Note The 24 hour measurement is subject to calibration accuracy DC voltage 0 1V 1V 10V 100V amp 1000V AC voltage 0 1V 1V 10V 100V amp 750V DC current 10mA 100mA 1A amp 3A AC current 1A amp 3A 2 4 wire resistance 1000 1KO 10 100KO 1 10MQ amp 100MQ Frequency From 3Hz to 300kHz Period measurement Diode measurement Continuity measurement f
4. Figure 4 29 Remote Interface Operation Users can use the following commands from their PC terminals to store or retrieve readings in the memory In addition the number for STORE function only can be set through front panel I Tiate This command tells the meter to be on wait for trigger state After a measurement is taken measurement readings will be placed in the memory FETCh Use this command to retrieve stored readings DATA POINts Use this command to query the number of stored readings 4 4 4 Sensitivity Band Hold The reading hold function captures and holds a stable reading on the display The multimeter beeps and holds the value when it detects a stable reading The sensitivity band in reading hold decides which reading is stable enough This band is expressed as a percent of reading on the selected range The multimeter considers a reading stable when three consecutive values are within the band User has an option to adjust this sensitivity band 97 Default The default band is 0 1 User s selection is stored in a volatile memory and it will be cleared after the meter has been turned off How to adjust the sensitivity band You can adjust the sensitivity band through either the front panel operation or the remote interface operation Front Panel Operation In order to adjust the sensitivity band please press MENU button then use 4 and gt buttons to find TRIG submenu Press ENTER to s
5. else 184 PviOpen usb m defaultRM usbtmc instrDescriptor 0 0 amp m instr usbtmc status PviSetAttribute_usb m_instr_usbtmc VI_ATTR_TMO_VALUE m_Timeout if hUSBTMCLIB printf M3500 device connect failed n return Write command IDN and read the M3500 identification string len 64 pStrout new char len ZeroMemory pStrout len strcpy pStrout idn status PviWrite usb m instr usbtmc unsigned char pStrout 6 amp nWritten Sleep 30 if status VI SUCCESS MessageBox NULL Write to device error M3500 multimeter device test MB_OK PviClose_usb m_defaultRM_usbtmc hUSBTMCLIB NULL m defaultRM usbtmc 0 return else printf output IDN n Sleep 1000 Read data from device len 64 185 if RUSBTMCLIB status PviRead usb m instr usbtmc pStrin len amp nRead if nRead gt 0 for len 0 len lt long nRead len buffer len pStrin len buffer nRead 0 printf input s n n buffer Set sample count to 1 strcpy pStrout SAMP COUN 1 status PviWrite_usb m_instr_usbtmc unsigned char pStrout amp nWritten Sleep 30 Set configure Voltage AC range 0 1A strcpy pStrout CONF VOLT AC 0 1 0 01 status PviWrite usb m instr usbtmc unsigned char pStrout amp nWritten Sleep 3000 Set configure frequency range Auto strcpy pStrout
6. enclose the parameter choices for a given command string The braces are not sent with the command string A vertical bar separates multiple parameter choices for a given command string Triangle brackets lt gt indicate that you must specify a value for the enclosed parameter For example the above syntax statement shows the range parameter enclosed in triangle brackets The brackets are not sent with the command string You must specify a value for the parameter such as VOLT DC RANG 10 Some parameters are enclosed in square brackets The brackets indicate that the parameter is optional and can be omitted The brackets are not sent with the command string If you do not specify a value for an optional parameter the multimeter chooses a default value Using the MIN and MAX Parameters You can substitute MINimum or MAXimum in place of a parameter for many commands For example consider the following command VOLTage DC RANGe lt gt MI Nimum Instead of selecting a specific voltage range you can substitute MIN to set the range to its minimum value or MAX to set the range to its maximum value Querying Parameter Settings 139 You can query the current value of most parameters by adding a question mark to the command For example the following command sets the sample count to 10 readings SAMP COUN 10 You can query the sample count by executing SAMP COUN
7. lee slo 5 Figure 4 10 4 2 2 Trigger Source In M3500A user can specify the trigger source to be one of these three options front panel operations external hardware trigger source and remote interface operations Front Panel Operation Use the front panel buttons AUTO TRIGGER for auto triggering and SINGLE for single triggering External Hardware User applies a trigger pulse to the Ext TRIG BNC terminal on the rear panel External hardware triggering is like using single trigger but the trigger source is an external hardware When the multimeter receives a pulse from the trigger source it takes one reading or a specified number of readings To set the external hardware trigger press both the SHIFT SINGLE buttons to enable external hardware trigger The lit EXT annunciator on the display indicates the enabling of the external hardware trigger 72 External Triger Terminal Users can trigger the M3500A by using a low true pulse to the Ext Trig external trigger terminal located on the rear panel And to use this terminal via the remote interface users have to select the external trigger source by using the TRIGer SOURce EXTernal command d gt 1ps xX Note Users can use a simple switch to generate external trigger by using the Ext Trig input as shown in the following VM COMP Voltmeter Complete Terminal The r
8. gt DEF resolution N MAX DEF FRESistance lt range gt MIN MAX DEF resolution N MAX DEF FREQuency lt gt MAX DEF resolution MIN MAX DEF PERiod lt range gt MIN MAX DEF resolution MI N DEF CONTinuity 116 DIODe TCOuple TEMPerature CONFigure The READ Command The READ Command changes the state of the trigger system from the idle state to the wait for trigger state When the specified trigger condition requirements are met after the multimeter receives the READ command the measurement will be initiated The results are sent to the output buffer right away You must enter the reading data into your bus controller or the multimeter will stop making measurements when the output buffer fills Readings are not stored in the multimeter s internal memory when using the READ Command Using the READ Command has a similar effect as using the INI Tiate command followed immediately by the FETCh command except readings are not buffered internally The Tiate and FETCh Commands These two commands provide the lowest level of control of measurement triggering and reading retrieval but offer the most flexibility After you have configured the multimeter use INITiate command to change the state of the triggering system from the idle state to the wait for trigger state The multimeter will start the me
9. 113 Table 5 1 Contact Typical Wiring V Signal Name Description Number Assignment 1 VBUS Red Floating 2 D White Limit Test Pass 3 D Green Limit Test Fail 4 GND Black GND If you disable the USB interface the Pass Fail output function will enable automatically Please follow the procedure below to enable disable this function Procedure MENU gt I NTERFACE USB ENABLE DI SABLE Or you can do this by the other way Procedure CONFI G SHI FT RATI O OUTPUT ENALBLE DI SABLE A Warning You can t use the USB interface if you want to enable the Pass Fail signal output You must use the GPIB interface for remote control Please disconnect the USB cable from you multimeter The signal from the USB cable may make the Pass Fail signal output abnormal 5 2 Setting Up For Remote I nterface User may use the M3500A application developed by PICOTEST to remotely control the multimeter through either USB or GBIP interface How to set up for USB interface The USB cord should be connected well between M3500A and your PC Install the M3500A application in your PC and execute the program Click Tool tab for Command Control then type in your command icons and buttons are shown with red rectangle frames in Figures 5 1 5 2 and 5 3 X Note The icons pictures and words will be changed or edited with 114 different versions without informing 3 Command Control
10. 57 4 1 4 DC Input Resistance 59 4 1 5 Threshold Resistance Continuity sss 61 4 1 6 Range Manual amp Auto 61 4 1 7 Rate Integration 63 4 1 8 Sensor Selection for Temperature lt 64 4 1 9 Remote Interface Selection sss 68 4 1 10 Input Terminal Switch 69 4 2 TRIGGER OPERATIONS 70 42 1 trigger siete heit dt beds 70 4 2 2 Trigger 5 tenente tenens 72 4 2 3 lrigger Setting ooo sexe ree denen den que edes 74 4 3 OPERATIONS 78 4 3 L nete 79 123225 Yo Percent des adr sae aree eme RR GENE 80 33 MIN eta t t Mantes t eine e Aes 81 4 34 Null seen iot E 83 4 3 5 Limits Test issue teen ete dus 84 43 6 e ur E OE en RUIN 86 4 3 7 tette tete idu edad dee 88 4 4 OTHER SYSTEM RELATED 92 4 4 1 ies e RE ERE e te Eee 92 24 27 css eret pe AR n ad ee RS 94 4 4 3 Reading Memory Store amp Recall 95 4 4 4 Sensitivity Band Hold sese 97 42455 Scanning SCAN emer oret eae etes 98 4 4 6 Stepping Step essent 102 4 4 7 Initial Modernen nn 104 4 4 8
11. REVISION option Press ENTER to select it The multimeter gives three numbers in format on the display The first number is the firmware revision number for the measurement microprocessor the second number is for I O processor and the third number is for the front panel processor The locations of the buttons are shown with red rectangle frames in Figure 4 36 MENU PREV NEXT ENTER Figure 4 36 4 4 11 Calibration M3500A will show the latest calibrated date and the next calibration date on the display after following the operation below The location of the buttons is shown with red rectangle frames in Figure 4 37 How to see the calibration information Press MENU then locate CALIBRATE option using lt and Press ENTER to select it Use 4 and gt to switch from the last calibrated date and the next calibration date 107 MENU PREV NEXT ENTER Figure 4 37 4 4 12 Self Test Self test procedures are built in M3500A for checking that the logic and measurement hardware are functioning properly Every time when the multimeter is powered on a set of test procedures is performed to make sure the basic function of the multimeter works properly If any error occurs during self test procedures it indicates that parts of the multimeter are not operating properly and need to be serviced A Wa
12. V Figure 4 26 Remote nterface Operation The following commands show how to control the display as well as how to send a message to the display DISPlay OFF ON turns off or turns on the display DISPlay TEXT quoted string displays the string you type in DISPlay TEXT CLEar clears the message displayed 93 4 4 2 Beeper M3500A multimeter beeps when some certain conditions are met or when an error occurs But there may be time you want to disable the beeper for some operations Although you can turn off the beeper the click sound you hear when a button is pressed will not be disabled The beeper state is stored in a volatile memory and the default will be restored when the meter has been turned off or after a remote interface reset By disabling the beeper you will not hear the meter beeps when a new minimum or maximum is found in Min Max operation a stable reading is detected and held the test voltage is within the limits in diode testing the source signal fails the limit testing After the beeper is disabled the meter still emits a tone when an error occurs any button on the front panel is pressed the threshold value is exceeded in continuity testing Default The beeper is enabled when it is shipped from the factory How to control the beeper User can control the beeper from either the front panel operation or the remote interface operation Front Panel Operation Foll
13. You can also query the minimum or maximum count allowed as follows SAMP COUN MIN SAMP COUN MAX X Note If you send two query commands without reading the response from the first and then attempt to read the second response you may receive some data from the first response followed by the complete second response To avoid this do not send a query command without reading the response When you cannot avoid this situation send a device clear before sending the second query command SCPI Command Terminators A command string sent to the multimeter must terminate with a new line character The IEEE 488 EOI end or identify message is interpreted as a new line character and can be used to terminate a command string in place of a new line gt character A carriage return followed by a new line is also accepted Command string termination will always reset the current SCPI command path to the root level I 488 2 Common Commands The IEEE 488 2 standard defines a set of common commands that perform functions like reset self test and status operations Common commands always begin with an asterisk are four to five characters 140 in length and may include one or more parameters The command keyword is separated from the first parameter by a blank space Use a semicolon to separate multiple commands as shown below RST CLS ESE 32 OPC SCPI Parameter Types The SCPI language defi
14. Press CONFIG SHIFT FILTER for scanning configuration Use lt and buttons to scroll through submenus Press ENTER on when you need to close a specific channel Press ENTER again on CHANNEL Use 4 and gt to move through the digits and V to increase or decrease the numbers to the desired channel number Press ENTER to close the channel To open all channels simply press ENTER on OPEN ALL option Press SHIFT FILTER to scan as shown as Figure 4 32 CONFIG ST FILTER PREV NEXT Figure 4 32 103 4 4 7 Initial Mode The section contains two selections DEFAULT and SAVE DATA You can select SAVE DATE to save the current configuration or select DEFAULT to restore the factory value after restarting M3500A The valid range of SAVE DATA is listed in Table 4 5 Table 4 5 No Items of Save Data Contents 1 Continuity Threshold Resistance 2 Diode Boundary Voltage Sensor Types Units gt USER 3 Temperature RTD define SPRTD 4 Thermocouple Types Units R Junction 5 Step amp Scan Count Timer 6 dBm Reference Resistance 7 MX B Values M B 8 Reading Hold Sensitivity Band 9 Input R DC Input Resistance USB GPIB ADDR RS232 baud amp 10 Interface parity 11 System Language Beep IDN string How to save the settings Press MENU and then use lt and to locate
15. SYSTEM submenu Press ENTER to select it Again use 4 and to locate INIT MODE submenu and then press ENTER to select it Use lt and gt to switch from SAVE DATA and DEFAULT Press ENTER on SAVE DATA to save your current setting or press ENTER on DEFAULT to return to default setting The locations of the buttons are shown with red rectangle frames in Figure 4 33 104 MENU NEXT 4 SFE SIO O ee XE EL Figure 4 33 4 4 8 Language M3500A supports two languages DEFAULT M3500A and COMPATIBLE How to set up the language Press MENU and then use lt ane to locate SYSTEM submenu Press ENTER to select it Again use lt and gt to locate LANGUAGE submenu Press ENTER to select it Use 1 and gt to switch to DEFAULT M3500A or COMPATIBLE Press ENTER on your selection The locations of the buttons are shown with red rectangle frames in Figure 4 34 PREV NEXT OK OC SA ud AVA ENTER press 2 lt O as J LIE Figure 4 34 4 4 9 Error Condition The error annunciator on the front panel display tells about the error condition of the multimeter If there are one or more syntax or hardware 105 errors found the error annunciator will be lit to inform user The multimeter stores errors us
16. 5 Slow 5 5 voltage DC digits 1 PLC Range Auto AC Digits 5 5 ae Slow 5 5 Current DC Digits 1 PLC Range Auto Digits 5 5 EFequeney Range AUTO and Period Medium Rate 100ms Digits 5 5 Diode Test Range 1mA Rate 0 1 PLC Slow 5 5 Resistance Digits 1 PLC 2 wire Range Auto Slow 6 5 Digits Temperature 10 PLC Thermocouple Universal Type Source Immediate Triggers Delay Auto Input Resistance 10MQ 25 2 2 Features Resolution 6 5 digits 5 7 dot matrix VFD dual displays with 3 color annunciators 11 standard measurement functions amp 8 math functions 4 front ground terminal are connected to Chassis Stability Accuracy and Speed 2000RDGS Sec at 4 5 Digit 50 RDGS Sec at 6 5 Digit in 60 Hz Multi Points Scanner Card Up to 10 Channels Optional RTD probe Adapter optional convenient to use Built in USB and GPIB Optional Interfaces Easy amp Free PC applications 2 3 M3500A Function Introduction For users to become familiar with the M3500A DMM we will give a brief introduction to the basic operations of M3500A DMM There are three major parts of M3500A 2 3 1 the front panel 2 3 2 the display and 2 3 3 the rear panel We will discuss each of them in the following sections 2 3 1 The Front Panel There are different buttons and terminals on the front panel They are divided into the following groups DISPLAY amp POWER FUNCTION MATH TRIGGER MEMORY SETUP RANGE INPUT TE
17. 8 21 Step 4 Remove the broken fuse from the selector as shown in Figure 2 9 I4 752 gt Ii Step 5 Replace with the new fuse as shown in Figure 2 10 Figure 2 9 2294 ROSY Figure 2 10 Step 6 Insert the voltage setting selector back into the socket and close the cap as shown in Figure 2 11 Figure 2 11 22 Step 7 Make sure the power switch on the front panel is in Power OFF condition before plugging as shown in Figure 2 12 Figure 2 12 Power switch POWER OFF Step 8 After finishing the above procedures you can plug in your power cord as shown in Figure 2 13 V y Figure 2 13 23 Step 9 Press on the power switch on the front panel for activating M3500A as shown in Figure 2 14 Figure 2 14 Power switch POWER 2 1 3 Factory Default When Power ON Table 2 1 shows the factory default of M3500A Table 2 1 Function Default Function DCV Autozero On Frequency and Period Source AC Voltage Output Format ASCII Ratio Off AC Input 20 2 Bandwidth Frequency 24 AC Digits 5
18. CONF FREQ status PviWrite usb m instr usbtmc unsigned char pStrout amp nWritten Sleep 3000 Set configure Current DC range 0 1A strcpy pStrout CONF CURR DC 1 0 01 status PviWrite usb m instr usbtmc unsigned char pStrout amp nWritten 5 3000 186 12 22 10 20 Fetch the M3500 measure value screen value Set Voltage DC measure strcpy pStrout CONF VOLT DC 0 1 0 1 status PviWrite usb m instr usbtmc unsigned char pStrout 21 amp nWritten Sleep 1000 Send read command strcpy pStrout READ status PviWrite usb m instr usbtmc unsigned char pStrout 6 amp nWritten Sleep 30 printf output READ n status PviRead usb m instr usbtmc pStrin 64 amp nRead if nRead gt 0 1 for len 0 len long nRead len 1 buffer len pStrin len buffer nRead 0 printf input s n n buffer Set device to local mode strcpy pStrout system local status PviWrite usb m instr usbtmc unsigned char pStrout 13 amp nWritten free pStrout Close device if IRUSBTMCLIB return m nCount 0 m defaultRM usbtmc 0 187 FreeLibrary RUSBTMCLI B hUSBTMCLIB NULL return 188 DECLARATION OF CONFORMITY 4 According to ISO IEC Guide 22 and CEN CENELEC EN 45014 Conformity with the following European Directives The product her
19. ENTER on ZERO GAIN Again use lt and gt buttons to locate it if it is not shown on the display Press ENTER on AUTO ZERO or AUTO GAIN option and then use lt and gt to the ON or OFF Press ENTER by your choice The locations of these buttons are shown with red rectangle frames in Figure 4 1 Procedures MENUSSET ADC ZERO AUTO ZERO ON OFF MENU SET ADC GAI N AUTO GAIN ON OFF Table 4 1 Auto Auto Integration Resolution Zero Gain Time PLC Fast 4 digits Off Off 0 02 52 Slow 4 digits On On 0 1 Fast 5 digits Off Off 0 1 Slow 5 digits On On 1 Fast 6 digits On On 1 Slow digits On On 10 Note To change resolution refer to Section 4 1 3 Resolution Setting in this chapter MENU PREV NEXT ENTER Figure 4 1 Remote Interface Operation To set Auto Zero and Auto Gain through the remote interface use the following commands SENSe ZERO AUTO OFF ONCE ON SENSe GAIN AUTO OFF ONCE ON The OFF and ONCE parameters have a similar effect Auto Zero OFF or Auto Gain OFF doesn t issue a new offset measurement However Auto Zero ONCE or Auto Gain ONCE issues an immediate offset measurement 53 4 1 2 Filter Filter is used to remove noises in measurement readings M3500A is equipped with two types of filters AC filter and digital filter AC filter is fo
20. INTRODUCTION 26 2 3 1 The Front a a 26 2 3 2 The DISPlay eU RR ERN ERR alui ides 30 2 3 2 1 Annunciators at Upper Side sss 31 2 3 2 2 Annunciators at Right 20 31 2 3 3 Th Rear Panel aene doe EGO n DORT Re ee 32 BASIC MEASUREMENT 34 3 1 VOLTAGE MEASUREMENTS DC 000000000 34 3 2 CURRENT MEASUREMENTS DC amp 36 3 3 RESISTANCE MEASUREMENTS 2 amp 4 WIRE 38 3 4 FREQUENCY amp PERIOD 5 40 3 5 CONTINUITY 5 41 3 6 DIODE MEASUREMENTS aee eed RETE HEATER HR Re 42 3 7 TEMPERATURE MEASUREMENTS 43 3 7 1 Thermocouple Measurements 44 3 7 2 RTD Measurements 44 3 7 2 1 2 Wire RTD Measurements sse 45 3 7 2 2 3 Wire RTD Measurements sse 46 3 7 2 3 4 Wire RTD Measurements sse 48 4 FRONT PANEL OPERATI 5 51 4 1 MEASUREMENT CONFIGURATION 51 4 1 1 Set ADC Auto Zero amp Auto Gain sese 51 4 1 2 I e ri 54 251 AC E E A estote 54 41222 Digital Filter i 55 4 1 3 Resolution Setting Digits
21. Nimum RESistance NPLCycles MI Nimum MAXimum FRESistance NPLCycles 0 02 0 1 1 10 MI Nimum MAXimum 120 FRESistance NPLCycles MINimum MAXimum SENSe FREQuency APERture 0 01 0 1 1 MI Nimum FREQuency APERture MI Nimum MAXimum PERiod APERture 0 01 0 1 1 MI Nimum MAXimum PERiod APERture MI Nimum MAXimum SENSe DETector BANDwidth 3 20 200 MI Nimum MAXimum DETector BANDwidth MI Nimum MAXimum SENSe AVERage TCONtrol MOVing REPeat AVERage TCONtrol COUNt lt value gt MINimum MAXimum AVERage COUNt MI Nimum MAXimum STATe OFF ON AVERage STATe SENSe ZERO AUTO ZERO AUTO GAIN AUTO OFF ONCE ON GAIN AUTO I NPut IMPedance AUTO OFF ON AUTO Scanner Card Configuration Commands ROUTe CLOSe lt channel gt ROUTe CLOSe ROUTe OPEN ROUTe STATe ROUTe SCAN FUNCtion channel function VOLT DC VOLT AC 121 FREQuency RESistance FRESistance NONE ROUTe SCAN FUNC lt channel gt ROUTe SCAN TIMER ROUTe SCAN TIMER lt value gt ROUTe SCAN COUNT ROUTe SCAN COUNT lt value gt ROUTe SCAN STATe ROUTe SCAN SCAN ROUTe SCAN STEP MATH OPERATION Commands There are eight math operations Only one of them can be enabled at a time They either store data for later use or perform mathematic
22. Status Reporting Commands SYSTem ERRor Query the multimeter s error queue Up to 20 errors can be stored in the queue Errors are retrieved in first in first out FIFO order Each error string may contain up to 80 characters STATus QUEStionable ENABle lt enable value gt Enable bits in the Questionable Data enable register The selected bits are then reported to the Status Byte STATus QUEStionable ENABle Query the Questionable Data enable register The multimeter returns a binary weighted decimal representing the bits set in the enable register STATus QUEStionable EVENt Query the Questionable Data event register The multimeter returns a decimal value which corresponds to the binary weighted sum of all bits set in the register STATus PRESet Clear all bits in the Questionable Data enable register CLS Clear the Status Byte summary register and all event registers 167 ESE lt enable value gt Enable bits in the Standard Event enable register The selected bits are then reported to the Status Byte ESE Query the Standard Event enable register The multimeter returns a decimal value which corresponds to the binary weighted sum of all bits set in the register ESR Query the Standard event register The multimeter returns a decimal value which corresponds to the binary weighted sum of all bits set in the register OPC Sets the operation complete bit bit 0 in the Standard Event regis
23. by pressing AUTO button on the front panel or use V buttons to select desired range 34 Connect test leads to your source signal and observe the reading shown on the display If the input signal is beyond the allowed range an overflow message OVLD will be displayed PICOTEST M3500A DC Voltage Source KO 500 HE PEE Input Resistance 10MQ on 1000V and 100V ranges gt 10GQ on 10V 1V and 100mV ranges Figure 3 1 PICOTEST M3500A AC Voltage Source qu 5000 Input Impedence 1 parallel with 100 Warning Maximum Input 750V RMS 1000V peak 8 x 10 V Hz Figure 3 2 Xx Note The rear panel terminals can also be used via the same procedures as the front panel terminals Refer to Figure 3 3 35 PICOTEST M3500A Rear Panel le 55 ali VM Voltage Measurement Figure 3 3 3 2 Current Measurements DC amp AC The ranges for DC current measurements in M3500A are 10mA 100mA 1A and 3A For AC current measurements the range is 1A with a sensitivity of 1 A to AC Coupled TRMS with a sensitivity of 10 4 A Figure 3 4 and 3 5 show you how to measure DC AC currents in M3500A Warning maximum input current allowed is 250V Do not apply excess current to your meter to avoid damaging th
24. delay To select a delay time use the following command or set the trigger delay to be automatic TRI Gger DELay lt seconds gt MI Nimum or TRI Gger DELay AUTO OFF ON 4 3 Math Operations This section will introduce the mathematical operations in M3500A There are eight math operations RITIO 96 Min Max NULL Limits MX B dB and dBm testing They either store data for later use or perform mathematical operations on the readings Note that these math operations are available to all measurement functions except continuity and diode testing Note The MATH anunnciator on the display indicates the state of a 78 mathematical feature excluding Ratio and will be lit by enabling whichever math feature Also press the same buttons again for the enabled math feature will disable the same math feature Note Press RATIO button the RATIO anunnciator will be lit on the display 4 3 1 Ratio This function calculates the ratio of an input DC voltage to a reference DC voltage according to the following equation DC Input Voltage Ratio DC Reference Voltage How to make a ratio measurement There are two ways to make a ratio measurement Through the front panel operation or through the remote interface operation Front Panel Operation Use TERMI NALS button to select the front terminals or the rear terminals Press CONFIG RATIO and then use 4 and gt buttons to locate RESOLUTI ON option Refer
25. for the reference resistance is 600 Q The locations of the buttons are shown with red rectangle frames in Figure 4 24 Note Press SHIFT MIN MAX again to disable this feature MATH anunnciator on the display indicates the state of a mathematical feature SHEL MIN MAX Figure 4 24 Remote I nterface Operation Use the following commands to enable dBm feature or to set the reference resistance CALCulate FUNCtion DBM CALCulate STATe OFF ON CALCulate STATe CALCulate DBM REFerence lt value gt MINimum MAXimum 91 4 4 Other System Related Operations Each system related operation performs a task that is not measurement related but plays an important role in making your measurements 4 4 1 Display M3500A has a 5x7 dot matrix dual display with three color White Red and Yellow annunciators for a better view A maximum 13 characters are allowed for upper row dot matrix display and a maximum 16 characters are allowed for lower row dot matrix display as shown on Figure 4 25 User has an option to turn off the display for a faster measurement without waiting for display or when the measurement is done through the remote interface operations on their PC terminal ADRS RMT MAN TRIG HOLD MEM RATIO MATH FILT 4W EXT E cc Figure 4 25 When the display is turned off an OFF will be lit at the lower rig
26. is stable enabling the reading hold will hold the stable reading and trigger a beeping sound Reading hold feature depends on an adjustable sensitivity band to determine if a reading is stable The multimeter considers a reading stable when three consecutive readings are within the sensitivity band Chapter 4 4 6 will explain how to adjust 75 the sensitivity band How to use reading hold This feature is only available from the front panel operations To enable reading hold press both SHIFT and AUTO TRIGGER buttons To disable it simply press AUTO TRIGGER The locations of the buttons are shown AUTO TRIGGER with red rectangle frames in Figure 4 12 Figure 4 12 D Trigger delay This feature is useful for user who needs a longer delay time to wait for the system to be stabilized The time needed to stabilize a measurement system is called the settling time The settling time depends on the measurement range cable properties and signal source Defaults The default of the trigger delay is automatic M3500A automatically selects a delay time for you according to the setting of the measurement if you do not specify a delay A list of the default for each measurement function is shown on Table 4 4 The range for the delay is from 0 to 3600 seconds User s selection of delay time is stored in a volatile memory and the default will be restored when the meter is power of
27. moving average mode with 10 readings by default How to enable disable digital filter Press FILTER button to switch the digital filter function The FILT anunnciator indicates the state of the digital filter When it is lit the filter is enabled How to configure digital filter You can configure the digital Filter either through the front panel operation or through the remote interface operation Front Panel Operation For READINGS setting please press CONFIG and then FILTER button for selecting READINGS Press ENTER to access Use 4 gt A and V buttons to set the READINGS from 2 to 100 in order to get an average value Press ENTER when it s ready For MODE setting please press CONFIG and then FILTER button for selecting MODE Press ENTER to access Use lt gt to select MOVING AVG or REPEAT AVG Please ENTER to confirm Press FILTER button to enable or disable this function Remote I nterface Operation Use the following commands to set your digital filter SENSe AVERage TCONtrol MOVing REPeat SENSe AVERage TCONtrol 56 SENSe AVERage COUNt lt value gt MI SENSe AVERage COUNt MI Nimum MAXimum SENSe AVERage STATe OFF ON SENSe AVERage STATe 4 1 3 Resolution Setting Digits Definition Resolution is the number of digits a multimeter can measure User can select the resolution for a specific measurement The choices for the resolution setting are fast 4 5 slow 4
28. needs to select a measurement function or the math function first and then select the trigger mode To store readings use the following steps Press STORE button and the multimeter will start to store the readings produced until the specified number of readings is reached The default number of readings to store is 100 To change this number press CONFIG and then STORE buttons Then use 1 and gt buttons to move between the digits A buttons to increase or decrease numbers as desired When ready press ENTER button The default number of readings will be restored when the meter has been turned off The location of the buttons are shown with red rectangle frames in Figure 4 28 Note The MEM annunciator will be lit while the multimeter stores readings and be turned off when the specified number of readings is reached Procedures CONFIG STORE NUMBER STORE PREV NEXT ENTER Figure 4 28 To recall the stored readings use the following steps Press RECALL button and the multimeter will display all the stored readings starting from the first reading Use lt and gt or Vand A buttons to move from the first reading to the last reading the meter has 96 stored The locations of the buttons are shown with red rectangle frames in Figure 4 29 RECALL PREV NEXT
29. range on all ranges except 1000Vdc and 3 A range 3 a Using continuous integrating A D converter b Input bias current less than pA at 25 c Input protection 100 V all range 133 1 000000A 1 uA 0 12 0 100 0 010 3 00000A 10 uA 0 10 0 120 0 020 1 Year Function Range Resolution Test Current 23 C 5 C 100 0000 Q 100 uQ 1mA 0 010 0 004 1 000000 1 1mA 0 010 0 001 10 00000 KQ 10 mQ 100 uA 0 010 0 001 100 0000 KQ 100 mQ 10 uA 0 010 0 001 Resistance 1 000000 MQ 10 5 uA 0 010 0 001 10 00000 MQ 10 Q 500 nA 0 040 0 001 100 Q 500 10 100 0000 MO 0 800 0 010 MQ Diode Test 1 0000V 10 lmA 0 010 0 020 Continuity 1000 00KO 10 mQ 1 0 010 0 030 Frequency and Period Characteristics Accuracy of reading a Specifications are for 4 wire ohms For 2 wire ohms use Math Null function b Max Lead Resistance 10 of range per lead for 1009 and 1KQ ranges 1 per lead for all other ranges C Input protection 1000 V all ranges 5 Specifications are for 6 digits and two hours warm up 134 6 20 over range on all ranges except 750 Vac range Function Range Frequency Hz 23 5 3 5 0 10 100mV Frequency 5 10 0 05 amp to Period 750V 10 40 0 03 40 300K 0 01 AC Characteristics 7 Accuracy of r
30. specified range applies to input signal yet autorange is selected for the reference signal MEASure VOLTage AC lt gt MI N MAX DEF resolution MI N MAX DEF Preset and make an AC voltage measurement with the specified range and resolution The reading is sent to the output buffer For AC measurement resolution is fixed at 6 digits Therefore the resolution parameter only affects the front panel display MEASure CURRent DC range MI N MAX DEF resolution MI N MAX DEF Preset and make a dc current measurement with the specified range and resolution The reading is sent to the output buffer MEASure CURRent AC lt range gt MI N MAX DEF resolution N MAX DEF Preset and make a AC current measurement with the specified range and resolution The reading is sent to the output buffer For AC measurement resolution is fixed at 6 digits Therefore the resolution parameter only affects the front panel display MEASure RESistance range N resolution MI N MAX DEF Preset and make a 2 wire measurement with the specified range and resolution The reading is sent to the output buffer MEASure FRESistance range MI N MAX DEF resolution MI N MAX DEF Preset and make a 4 wire measurement with the specified range and resolution The reading is sent to the output buffer MEASure FREQuency range MI
31. the front panel menu operation is locked CC OVP Not used for Model M3500A CV OCP Not used for Model M3500A OFF Indicates the front panel display is turned off Figure 2 19 31 2 3 3 The Rear Panel The rear panel of the M3500A is shown in Figure 2 20 This figure includes important abbreviated information that should be reviewed before using the instrument 2 345 Figure 2 20 1 Inserted Connections amp Fuse Device amp LO Used for all measurements except AC amp DC current and temperature LO amp 1 Used for making DC and AC current measurements Rear Fuse Secures your Meter against damage of strong current pulse 2 BNC Connections VM COMP Voltmeter Complete Output Terminal Outputs a low true pulse after the completion of each measurement EXT TRIG External Trigger Input Terminal Inputs a low true pulse from a remote interface 3 USB Connection Connects a remote computer for changing operation environment instead of the front panel control 4 Protective Conductor Terminal 5 Power Module Contains the AC line receptacle power line fuse and 32 line voltage setting Configured for line voltages of 100 220V or 120 240V Depend on the power utility in your area Option Slot Designed for installing an optional multi point scanner Model M3500 opt01 Option GPIB 488 Connection Connects a remote computer with an 488 c
32. the handle as shown in Figure 1 5 Figure 1 5 16 2 1 2 To connect the power Check the power line voltage on the rear panel to see if voltage setting is correct for your area Change the setting if it is not correct or the fuse is broken Please follow the steps below 2 1 2 1 To convert the voltage Warning In some areas the power supplied voltage is 240 or 120V in others the power supplied voltage is 220 V or 100 V Please refer to your local power supplied voltage to see if you have the right setting Warning Before changing the setting make sure the multimeter is disconnected from the AC power An incorrect voltage setting may cause severe damage to your instrument Warning The power supplied with M3500A contains separate ground wire for use with grounded outlets When proper connections are made instrument chassis is connected to power line ground through the ground wire in the power cord Failure to use a grounded outlet may result in personal injury or death due to electric shock Suppose your condition is in AC 100V and you want to convert the voltage to the 220V Follow these steps to change the voltage setting Step 1 Verify that the meter is disconnected as shown in Figure 2 1 17 Figure 2 1 Step 2 Open the voltage setting selector cap as shown in Figure 2 2 You might need a screwdriver to do so Figure 2 2 Step 3 Remove the red voltage setting s
33. the standard event register will signal as a command sequence is completed The bit is set in the register after executing an OPC command And if users send an OPC after a command loading a message in the DMM s output buffer the operation complete bit is allowed to be used to determine as the message is available However if there are too many messages generated before executing the OPC command the output buffer will be filled and the DMM will be interrupted to take readings About the Standard Event Register The standard event register reports the instrument event types below such as power on detected command syntax errors command execution errors self test calibration errors query errors or the moment of executing an OPC command Then through the enable 164 register all conditions will be reported in the standard event summary bit At the moment users have to write a decimal value by using the ESE command to set the enable register mask X Note 1 The errors the DMM s error queue except reading the error queue by using SYSTem ERRor will be recorded by an error condition including bits 2 3 4 or 5 of the standard event register X Note 2 In both the standard event register bit and the questionable data event register bits O 1 or 9 a reading overload condition can be reported all the time But in the DMM s error queue no error message will be recorded Bit Definitions for Standard Event R
34. 0 Where If you are using SPRTD Standard Platinum RTD select SPRTD and specify the seven coefficients under SPRTD submenu The ITS International Temperature Scale 90 standard provides two 65 reference equations for Standard Platinum Thermometers covering temperature range from 18 8033K to 1234 93K However one SPRTD usually cannot cover the entire range so the temperature range is broken up into a few subranges These subranges depend on the calibration point of temperature scale and are based on the melting or triple points of various pure substances For an exact list of the elements needed and details on RTD calibration refer to NIST Technical Note 1265 Guidelines For Realizing the International Temperature Scale of 1990 In each subrange the calibration constants required for that subrange are listed Default The default sensor type in M3500A is PT100 How to set up RTD You can set up the RTD configuration either through the front panel operation or through the remote interface operation Front Panel Operation If you are using RTD press CONFIG and then TEMP Use lt and gt to locate SENSOR submenu Press ENTER to to the submenu Use lt and gt to locate your sensor type Press ENTER to select your desired sensor type Choosing USER takes you to a menu where you can specify factors used in the calculation equation to obtain the temperature Use 4 and to move through the digits and A and V to cha
35. 0 ret If stat VI SUCCESS Then MsgBox System command vbExclamation multimeter device test stat viClose fList Exit Sub End If Rem send command Select 200 Hz fast ac filter stat viWrite sesn DET BAND 200 12 ret If stat VI SUCCESS Then MsgBox System command vbExclamation multimeter device test stat viClose fList Exit Sub End If Rem send command kM3500 will accept 5 triggers stat viWrite sesn SAMP COUN 5 11 ret If stat VI SUCCESS Then MsgBox System command vbExclamation multimeter device test stat viClose fList Exit Sub End If Rem send command Trigger source is IMMediate stat viWrite sesn TRIG SOUR IMM 13 ret If stat VI SUCCESS Then MsgBox System command vbExclamation multimeter device test stat viClose fList Exit Sub End If Rem send command Select dBm function stat viWrite sesn CALC FUNC DBM 13 ret If stat VI SUCCESS Then MsgBox System command vbExclamation multimeter device test stat viClose fList Exit Sub End If Rem send command Enable math stat viWrite sesn CALC STAT ON 12 ret If stat VI SUCCESS Then MsgBox System command vbExclamation multimeter device test stat viClose fList Exit Sub End If Rem send command Take readings stat viWrite sesn READ amp vbLf 6 ret If stat VI SUCCESS Then Msg
36. 2 2 M3500A 6 5 Digit Digital Multimeter GND PICOTEST uuum m m cm User s Manual Printed date 02 2009 M3500A DMM EXTENSION CARD OPTION User s Manual Table of Contents 1 GENERAL NFORMATI ON ssssssssssssascsssssnssnavosndsvveasonsesesinsvssvesondensesnsensaviusseavosnsvndaviessnanesss 6 1 21 FEATURE QVERVIEW eee eee eee ehe n eo len Teide ed 6 1 2 WARRANTY INFORMATION 7 1 3 PRECAUTION OF OPERATION 8 1 4 UPKEEP M3500A nennen enne 9 15 SAFETY INFORMATION rtr RBS RUE ES 9 1 6 SYMBOLS AND TERMS nee tento I CIR TR Aidit m rides 10 l1 4 INSPECTION a te def ete eco edi eti i eps 11 1 8 OPTIONS AND ACCESSORIES riete ener a ten 12 1 9 M3500A S DIMENSION recte er eee 13 2 oA LEATA N A 004 H 14 2 1 SETTING UP YOUR M3500A DIGITAL MULTI METER 14 2 1 1 To adjust the handle sse 14 2 1 2 To connect the 2 2 2 4 0 0 040 2020004404004000000 0 0 17 2 1 2 1 To convert the voltage sse 17 2 1 2 2 To change the fuse sss 20 2 1 3 Factory Default When Power ON 24 2 2 FEATURES ee ein efie e ete a ei eei tid d ee ei 26 2 3 M3500A FUNCTION
37. 41 I NPut I MPedance AUTO OFF String Parameters String parameters can contain virtually any set of ASCII characters A string must begin and end with matching quotes either with a single quote or with a double quote You can include the quote delimiter as part of the string by typing it twice without any characters in between The following command uses a string parameter DISPlay TEXT quoted string C 2 Output Data Formats Output data will be in one of formats shown in the table below Type of Output Data Non reading queries Single reading IEEE 488 Multiple readings I EEE 488 Single reading RS 232 Multiple readings RS 232 Output Data Format 80 ASCII character string SD DDDDDDDDESDD lt nl gt SD DDDDDDDDESDD nl SD DDDDDDDDESDD cr nl SD DDDDDDDDESDD cr nl S Negative sign or positive sign D Numeric digits E Exponent nl newline character cr carriage return character C 3 The MEASure Command MEASure VOLTage DC range N MAX DEF lt resolution gt MI N MAX DEF Preset and make a dc voltage measurement with the specified range and 142 resolution The reading is sent to the output buffer MEASure VOLTage DC RATio lt range gt MI N MAX DEF lt resolution gt MI N MAX DEF Preset and make a dc dc ratio measurement with the specified range and resolution The reading is sent to the output buffer For ratio measurements the
38. 5 fast 5 5 slow 5 5 fast 6 5 and slow 6 5 For a higher accuracy user can select 6 5 digit resolution For a faster measurement user can select 4 5 digit resolution The resolution setting applies to all math operations under the selected measurement function The selected value is stored in a volatile memory and the setting is only valid for the current measurement function User can select different resolution for different measurement function Default The default value for the resolution is slow 5 5 digit and the default value will be restored when the meter has been turned off or after a remote interface reset The user selected value for the resolution setting is stored in a volatile memory and the setting is only valid for the current measurement function Please refer to Table 2 1 on page 24 Note The resolution setting for AC measurements is actually fixed at 6 digits When user selects a lower resolution the meter will mask out the extra digits User s selection of resolution for AC function will not affect the actual speed or accuracy How to set the resolution The resolution can be set either through the front panel or the remote interface operation 57 Front Panel Operation There are two ways to set the resolution The locations of the buttons are shown with red rectangle frames in Figure 4 3 A First select your desired measurement function by pressing one of the function buttons located on the firs
39. 6 W average Operating Temperature 0 C to 50 C Operating Humidity Maximum relative humidity 8096 for temperature up to 31 Storage Temperature 40 to 70 Operating Altitude Up to 2000m Bench Dimensions 224mm x 113mm x 373mm WxHxD Weight 4 36 kg 61010 1 2001 61010 1 2001 274 Edition Safety UL61010 1 2004 Measurement CAT 11 600V CAT 1000V Pollution Degree 2 EN61326 1997 A1 1998 A2 2001 A3 2003 EMI CISPR 11 1997 A1 1999 A2 2002 Class B EC61000 3 2 2000 EC61000 3 3 1994 A1 2001 EMS EMC 61000 4 2 1995 1 1998 2 2000 EC61000 4 3 2002 EC61000 4 4 2004 1EC61000 4 5 1995 A1 2000 EC61000 4 6 1996 A1 2000 EC61000 4 8 1993 A1 2000 61000 4 11 1994 1 2000 C Remote Interface Reference C 1 An Introduction to the SCPI Language The LO jack is marked with 500Vpk against ground and SENSE HI to LO is only marked with 200Vpk in opposition to the label of 600V CAT 11 and or 1000V CAT I against ground and IEC 61010 1 137 SCPI Standard Commands for Programmable Instruments is an ASCII based instrument command language designed for test and measurement instruments Refer to Simplified Programming Overview for an introduction to the basic techniques used to program the multimeter over the remote interface SCPI commands are based on a hierarchical structure also known as a tree system In this syst
40. Box System command vbExclamation multimeter device test stat viClose fList Exit Sub End If 179 M3500 M3500 M3500 M3500 M3500 M3500 M3500 Sleep 3000 wait for math processing Rem fetch the measure data stat viRead sesn readin 128 ret If stat VI SUCCESS Then MsgBox Read in data error vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If Rem set to local mode stat viWrite sesn system local 12 ret If stat VI SUCCESS Then MsgBox System command error system local vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If stat viClose sesn stat viClose fList stat viClose dfltRM For i 0 To 5 1 print out the 4 times samples reading Debug Print Rdgs Mid readin i 16 1 15 Next MsgBox End of Job End Sub C DEVQUERY Sample Application This C sample application is a Win32 console application It illustrates how to use the PICOTEST IOUtils COM A Win32 console application is a Win32 application which uses text based input and output not a graphical interface This allows you to quickly create a Win32 application by using simple input and output functions Creating the Application Create a new Visual C project as follows 1 Create a new Win32 Console Application project calling the project DEVQUERY 2 Specify that this project will be a simple appli
41. EEE 488 Compliance Information I EEE 488 2 Common Commands CLS ESE enable value ESE ESR IDN OPC OPC PSC 0 1 PSC RST SRE lt enable value gt SRE STB TRG Dedicated Hardware Lines Addressed Commands ATN IFC REN SRQ Attention Interface Clear Remote Enable Service Request I nterrupt DCL EOI GET GTL LLO SDC SPD SPE Device Clear 171 End or Identify Message Terminator Group Execute Trigger Go to Local Local Lock Out Selected Device Clear Serial Poll Disable Serial Poll Enable Using Device Clear to Halt Measurements Device clear is an IEEE 488 low level bus message which can be used to halt measurements in progress Different programming languages and EEE 488 interface cards provide access to this capability through their own unique commands The status registers the error queue and all configuration states are left unchanged when a device clear message is received Device clear performs the following actions measurements in progress are aborted The multimeter returns to the trigger idle state The multimeter s input and output buffers are cleared The multimeter is prepared to accept a new command string For RS 232 operation sending the lt Ctrl C gt character will perform the equivalent operations of the IEEE 488 device clear message The multimeter s DTR data terminal ready handshake line will be true following a
42. IG TEMP and 4 or gt When ready press ENTER button Press TEMP button 5 Place in the desired position and take the reading the display 48 PICOTEST M3500A Figure 3 17 Platinum Sense 24 wire LO RTD e Input LO Input j Sense Q4 wire HI Sense Q4 wire LO L Input LO Zoe Sees 49 Sense 24 wire Platinum RTD Figure 3 18 50 4 Front Panel Operations This chapter contains information about how to change the parameters and settings for your measurements and all the details about each feature and function 4 1 Measurement Configuration The following information will guide you through ways to configure measurement functions It provides you the flexibility to change any parameter in any measurement function when needed including ADC setting filter resolution setting digits DC input resistance threshold resistance continuity range manual amp auto rate integration time sensor type for temperature measurements remote interface selection and input terminal switch 4 1 1 Set ADC Auto Zero amp Auto Gain Zero and Gain The purpose of Auto Zero and Auto Gain functions are used for minimizing the offset influence on your measurements When Auto Zero or Auto Gain is enabled M3500A ta
43. L1 Set to the compatible identification string SYSTEM I DNSTR Manufacturer Product Change the multimeter s identification string such as the maker s and the product s names be sure to dimension a string variable with at most 39 characters DATA POI Nts Query the number of readings stored in the multimeter s internal memory RST Reset the multimeter to the power on configuration This command can not clear the error queue I DN Read the multimeter s identification string be sure to dimension a string variable with at least 35 characters Other I nterface Commands SYSTem LOCal Place the multimeter in the local mode All buttons on the front panel are fully functional SYSTem REMote Place the multimeter in the remote mode All buttons on the front panel except the LOCAL button are disabled C 9 The SCPI Status Pattern Status registers are provided in the same way by all SCPI equipment And there are three register groups with various equipment conditions recorded by the status system They are the Status Byte Register the Standard Event Register and the Questionable Data Register 159 The Status Byte Register collects and records high level summary information which is reported in other register groups With the following diagram illustration users would make themselves clear for the SCPI status system In addition the Standard Event and the Questionable Data Registers have event registers which
44. Language e nennen 105 4 4 9 Error Conditions iuc ER eia eet 105 4 4 10 Firmware Revision sss 106 4 4 11 Calibration sette ende rus 107 4 4 12 Self dae enata en 108 5 REMOTE INTERFACE 5 2 113 5 1 PASS FAIL OUTPUT FROM USB CONNECTOR 113 5 2 SETTING UP FOR REMOTE INTERFACE ener 114 5 3 REMOTE INTERFACE 5 115 6 ERROR MESSAGES aneneen eesis orso seire aE 127 ERRORDYPE 128 6 1 1 Execution 5 etre 128 1 M P 132 A SPECIFICATION 2 ene eia ea a gest aie bie 133 B GENERAL SP CIFICATIONS scorra teete nn n E S E E r 136 C REMOTE INTERFACE REFERENCE 137 1 An Introduction to the SCPI 137 C 2 Output Data Formats sss 142 The MEASure Command 1 2 7 esee 142 C 4 The CONFigure Command essere 144 C 5 The Measurement Configuration 146 C 6 The Math Operation Command 153 C 7 The Triggering 2 2 2 4110400000000000000000000000080000000000 156 C 8 The System Related 5
45. MINimum MAXimum Set the delta constant for the user type SENSe TEMPerature RTD DELTa MI Nimum MAXimum Query the delta constant for the user type SENSe TEMPerature SPRTD RZERo lt value gt MI Nimum Set the sensor R value at 0 degree Celsius SENSe TEMPerature SPRTD RZERo MI Nimum MAXimum Query the sensor R value at 0 degree Celsius SENSe TEMPerature SPRTD A4 lt value gt MINimum MAXimum Set the A4 coefficient SENSe TEMPerature SPRTD A4 MI Nimum MAXimum Query the A4 coefficient SENSe TEMPerature SPRTD B4 value MI Nimum Set the B4 coefficient SENSe TEMPerature SPRTD B4 MI Nimum MAXimum Query the B4 coefficient SENSe TEMPerature SPRTD AX lt gt Nimum Set the A coefficient SENSe TEMPerature SPRTD AX MI Nimum MAXimum Query the A coefficient SENSe TEMPerature SPRTD BX value MI Nimum MAXimum Set the B coefficient 149 SENSe TEMPerature SPRTD BX MI Nimum MAXimum Query the B coefficient SENSe TEMPerature SPRTD CX lt value gt MI Set the coefficient SENSe TEMPerature SPRTD CX MI Nimum MAXimum Query the C coefficient SENSe TEMPerature SPRTD DX lt gt Set the D coefficient SENSe TEMPerature SPRTD DX MI Nimum MAXimum Query the D coefficient SENSe TEMP
46. N MAX DEF resolution MI N MAX DEF Preset and make a frequency measurement with the specified range and resolution The reading is sent to the output buffer For frequency measurements the meter uses only one range for all inputs between 3Hz and 300kHz With no input signal applied frequency measurements return 0 143 MEASure PERiod lt range gt N DEF lt resolution gt MI N MAX DEF Preset and make a period measurement with the specified range and resolution The reading is sent to the output buffer For period measurements the meter uses only one range for all inputs between 0 33 seconds and 3 3 usec With no input signal applied period measurements return O MEASure CONTinuity Preset and make a continuity measurement The reading is sent to the output buffer The range and resolution are fixed at 1kO and 5 digits respectively MEASure DI ODe Preset and make a diode measurement The reading is sent to the output buffer The range and resolution are fixed at 1Vdc with 1mA current source and 5 digits respectively MEASure TEMPerature Preset and make a temperature measurement with RTD The reading is sent to the output buffer MEASure TCOuple Preset and make a temperature measurement with thermocouple The reading is sent to the output buffer C 4 The CONFigure Command CONFigure VOLTage DC range MI N MAX DEF lt resolution gt MI N MAX DEF Preset a
47. OTEST M3500A 04 Resistance Under Test Note Source current flows from the INPUT HI to INPUT LO terminals Figure 3 7 Note The rear terminal panel also can be used via the same procedures like the front panel as shown in Figures 3 8 and 3 9 PICOTEST M3500A Rear Panel N 2 wire resistance measurement Figure 3 8 39 PICOTEST M3500A Rear Panel 4 wire resistance measurement Figure 3 9 3 4 Frequency amp Period Measurements M3500A uses an on board counter with 25MHz to measure the frequency period The measurement band is from 3Hz to 300kHz or 333 ms to 3 3 us and the measurement voltages range from 100mV to 750 V in AC The default for RANGE is auto range Warning The maximum input allowed is 1000V Applying excess voltage may damage your meter How to measure frequency and period Selects input signal connections on front or rear panel Connect the test leads to the terminals as shown in Figure 3 2 Set RESOLUTION Refer to 4 1 1 and INPUT JACK Or skip this step if default is to be used Press FREQ button for frequency measurement or SHIFT FREQ buttons for period measurement Select the auto range function by pressing AUTO button on the front panel or use and V buttons to select the desired range Connect test leads to your source signal and observe the reading shown on the display If the input si
48. RMINALS and FILTER DIGITS LOCAL and SHIFT as shown in Figure 2 15 26 1 Figure 2 15 Power amp Display Power Activates M3500A DMM Display Shows model version amp condition by pressing round PREV amp NEXT buttons 2 1 First row without SHIFT button DCV Selects DC voltage measurement ACV Selects AC voltage measurement Q2 Selects 2 wire resistance measurement FREQ Selects frequency measurement CONT Selects the continuity test TEMP Selects RTD temperature measurement 2 2 First row with SHIFT button DCI Selects DC current measurement ACI Selects AC current measurement Q4 Selects 4 wire resistance measurement PERI OD Selects period measurement gt Selects diode testing TCOUPL Selects thermocouple temperature measurement 2 3 Second row without SHIFT button FILTER Enable or disable the digital filter 27 DIGITS Changes resolution RATIO Enables the dcv dcv ratio function Calculates the ratio to a target value in percentage MIN MAX Captures the minimum or maximum readings from the measurement NULL Activates the offset function in order to get the real measured reading 2 4 Second row with SHIFT button STEP Scans from a channel to the next channel in delayed action when using the scanner card SCAN Enables scanning function when using the scanner card LIMITS Used for Setting upper and lower limit values for readings MX B Used for calcula
49. SE values ESE About the Status Byte Voltage Overload Current Overload 4 Status Byte Summary Register Enable Register o Notused Not Used Not Used 3 Questionable Data OR 4 5 Standard Event SRE value SRE The conditions from other status registers will be reported by the status byte summary register The query data waiting in the multimeter s output buffer is reported immediatedly through the message available in bit 4 Besides bits are not latched in the summa ry registers In addition to clear an event register will clear the according bits in the status byte summary register And to read all messages in the output buffer including all pending queries will clear the message available bit The following list shows the definition of each bit 161 Decimal Bit Definition Value Not Used 1 Set to 0 1 Not Used 2 Set to 0 Not Used 4 Set to 0 Questionable Data 8 to be enabled in enable register Message Available 16 Data in the DMM s output buffer is available One or more bits are set in the Standard Event Register Bits have to Standard Event 32 be enabled in enable register 6 Request Service 64 The DMM is requiring service Serial Poll 7 Not Used 128 Set to 0 On the other hand there are some conditions that users have to note The following conditions will clear the summary register
50. SI Mulated SENSe TEMPerature RTD TYPE PT100 D100 F100 PT385 PT3916 USER SPRTD NTCT TEMPerature RTD TYPE TEMPerature RTD RZERo value MINimum MAXimum TEMPerature RTD RZERo MI Nimum MAXimum TEMPerature RTD ALPHa value MINimum MAXimum TEMPerature RTD ALPHa MI Nimum MAXimum TEMPerature RTD BETA value MINimum MAXimum TEMPerature RTD BETA MINimum MAXimum TEMPerature RTD DELTa value MI Nimum TEMPerature RTD DELTa MI Nimum MAXimum TEMPerature SPRTD RZERo value MINimum MAXimum TEMPerature SPRTD RZERo MI Nimum MAXimum TEMPerature SPRTD A4 value MI Nimum MAXimum TEMPerature SPRTD A4 MINimum MAXimum TEMPerature SPRTD B4 value MINimum MAXimum TEMPerature SPRTD MI Nimum MAXimum TEMPerature SPRTD AX lt value gt MINimum MAXimum TEMPerature SPRTD AX MINimum MAXimum TEMPerature SPRTD BX lt value gt MINimum MAXimum TEMPerature SPRTD BX MINimum MAXimum TEMPerature SPRTD CX lt value gt MINimum MAXimum TEMPerature SPRTD CX MI Nimum MAXimum TEMPerature SPRTD DX lt value gt MINimum MAXimum TEMPerature SPRTD DX MI Nimum MAXimum SENSe VOLTage NPLCycles 0 02 0 1 1 10 MINimum VOLTage DC NPLCycles MI Nimum MAXimum CURRent DC NPLCycles 0 02 0 1 1 10 MI Nimum CURRent DC NPLCycles MI Nimum MAXimum RESistance NPLCycles 0 02 0 1 1 10 MI
51. Setting Record Operation M3500A USB String Received Figure 5 1 Figure 5 2 Figure 5 3 How to set up for GPIB interface Insert GPIB interface card into the interface slot on the rear panel Install the M3500A application in your PC and execute the program Click Tool tab for Command Control then type in your command The icons and buttons are shown with red rectangle frames in Figures 5 1 5 2 and 5 3 5 3 Remote Interface Commands User can instruct the multimeter to take measurements using the SCPI commands after the appropriate setup for their selected remote interface The following conventions are used in SCPI command syntax Triangle brackets lt gt indicates that you must specify a value for the enclosed parameter The square brackets indicates that the parameter is optional and can be omitted The braces enclose the parameter choices for a given command string A vertical bar separates several choices for a parameter The MEASure Command Although it does not offer much flexibility using the MEASure Command is the simplest way to program the multimeter for measurements You select the measurement function range and resolution the multimeter 115 automatically sets the other parameters for you make the measurement and send the result to the output buffer MEASure VOLTage DC MAX DEF lt gt DEF VOLTage RA
52. Tio lt gt MIN MAX DEF 7 lt resolution gt MIN MAX DEF VOLTage AC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF CURRent DC lt gt MIN MAX DEF lt resolution gt MIN MAX DEF CURRent AC lt range gt MIN MAX DEF lt resolution gt MI N MAX DEF RESistance lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF FRESistance lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF FREQuency lt gt DEF lt resolution gt MIN MAX DEF PERiod lt gt DEF lt resolution gt MI N MAX DEF CONTinuity DI ODe TCOuple TEMPerature The CONFigure Command The CONFigure command offers a little more flexibility than the MEASure Command The multimeter sets the parameters for the requested function range and resolution but does not make the measurements You have an option to change the configuration To initiate the measurement use INITiate or READ Command CONFigure VOLTage DC lt range gt DEF lt resolution gt MIN MAX DEF VOLTage DC RATio lt range gt MAX DEF resolution MIN MAX DEF VOLTage AC lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF CURRent DC lt range gt MIN MAX DEF resolution2 N MAX DEF CURRent AC lt gt MIN MAX DEF resolution2 MI N MAX DEF RESistance lt
53. Users execute a CLS clear status command To query the standard event and questionable data registers will clear only the separate bits in the summary register The following conditions will clear the enable register Users turn on the power and have set the DMM previously by using the PSC 1 command Users execute a SRE 0 command X Note If users have set the DMM previously by using PSC 0 the status byte enable register won t be cleared at power on How to use SRQ Service Request and Serial Poll Users have to set their bus controller to repond to the IEEE 488 SRQ and interrupt to use this capability Use the status byte enable register SRE to select the low level IEEE 488 SRQ signal set by summary bits As the status byte bit 6 is set an IEEE 488 SRQ interrupt message will be sent automatically to the bus controller which may poll the instruments on the bus to identify which one requested service To read the status byte which is using an IEEE 488 serial poll or to read the event register whose summary bit is cauing the service request will clear the request 162 One or more bits are set in the questionable data register Bits have service Users send the IEEE 488 serial poll message to read the status byte summary register And to query the summary register will return a decimal value corresponding to the binary weighted sum of the bits set in the register And serial poll will clear the request servic
54. _usb NULL PviWrite_usb NULL PviRead_usb NULL PviSetAttribute_usb NULL FreeLibrary RUSBTMCLI B hUSBTMCLIB NULL MessageBox NULL NIVISA for USBTMC library not ready M3500 multimeter device test MB OK return printf n Start C Example program n printf We check the M3500 multimeter on USB port and n printf identify the first connected M3500 device n n Open Device Resource Manager status PviOpenDefaultRM usb amp m defaultRM usbtmc if status OL 1 183 PviClose_usb m_defaultRM_usbtmc hUSBTMCLIB NULL m defaultRM usbtmc 0 MessageBox NULL USBTMC resource not found M3500 multimeter device test MB OK return else Find the USBTMC device USB 0 9 0x05E6 0xM3500 INSTR Hex status PviFindRsrc_usb m_defaultRM_usbtmc USB 0 9 0x05E6 0xM3500 INSTR amp m findList usbtmc amp m nCount instrDescriptor if status OL II Find the USBTMC device USB 0 9 0x05E6 0xM3500 INSTR Dec status PviFindRsrc_usb m_defaultRM_usbtmc USB 0 9 1510 8448 INSTR amp m_findList_usbtmc amp m nCount instrDescriptor if status OL 1 PviClose usb m defaultRM usbtmc hUSBTMCLIB NULL m defaultRM usbtmc 0 else PviOpen_usb m_defaultRM_usbtmc instrDescriptor 0 0 amp m_instr_usbtmc status PviSetAttribute_usb m_instr_usbtmc VI_ATTR_TMO_VALUE m_Timeout
55. able for changing operation environment instead of the front panel control Model M3500 opt04 33 3 Basic Measurement Function This chapter introduces some basic measurement functions in M3500A You will learn how to use your M3500A multimeter to measure voltage current resistance frequency period continuity diode and temperature in this chapter 3 1 Voltage Measurements DC amp AC The ranges for DC voltage measurements in M3500A are 100mV 1V 10V 100V and 1000V For AC voltage measurements the ranges are 100mV to 750V AC Coupled TRMS 1000V peak Figures 3 1 and 3 2 show the locations of the buttons needed and message display for voltage measurement Figure 3 3 shows the location of the input terminals on the rear panel A Warning Do not apply more than 1000V peak to the multimeter Applying excess voltage may damage your meter or cause possible electric shock or personal injury Note To eliminate the thermal EMFs due to the differences between two metals use copper leads to connect your source signal to the meter How to measure voltage D Selects input signal connections on front or rear panel 2 Connect the test leads to the terminals as shown in Figure 3 1 DC or Figure 3 2 AC 8 Set RESOLUTION of DCV Refer to 4 1 3 BAND WIDTH of ACV Refer to 4 1 2 1 or skip this step if default is to be used 4 Press DCV or ACV button for DC or AC voltage measuring 5 Select the auto range function
56. al Operations on the readings Note that these eight math operations are available to all measurement functions except continuity and diode testing The math operations use one or more internal registers You can preset the values in some of the registers while others hold the results of the math operations CALCulate FUNCtion PERCent AVERage NULL LI Mit MXB DB DBM FUNCtion STATe OFF ON STATe CALCulate PERCent TARGet lt value gt MINimum MAXimum PERCent TARGet MINimum MAXimum CALCulate AVERage MI Nimum AVERage MAXimum AVERage AVERage AVERage COUNT 122 CALCulate NULL OFFSet lt gt NULL OFFSet MINimum MAXimum CALCulate LI Mit LOWer lt value gt MINimum MAXimum LI Mit LOWer MINimum MAXimum LI Mit UPPer lt value gt MINimum MAXimum LI Mit UPPer Nimum MAXimum CALCulate MXB MMFactor lt value gt MINimum MAXimum MXB MMFactor MINimum MAXimum MXB MBFactor lt value gt MINimum MAXimum MXB MBFactor MINimum MAXimum CALCulate DB REFerence lt value gt MINimum MAXimum DB REFerence MINimum MAXimum CALCulate DBM REFerence lt value gt MINimum MAXimum DBM REFerence MI Nimum MAXimum DATA FEED RDG_STORE CALCulate DATA FEED TRIGGERING M3500A provides a variety of trigger operations for user User can select a trigger mode a trigger source and different trigger setting
57. al per contact 1uV max lt 500nV typical per contact pair 1yuV max Connector Type Screw terminal 22 AWG wire size Isolation Between Any Two Terminals gt 10 Gohm 75pF Isolation Between Any Terminal and Earth 210 Gohm 150pF Common Mode Voltage 350V peak between any terminal and earth Maximum Voltage Between Any Two Terminals 200V peak Maximum Voltage Between Any Terminal and M3500A Input LO 200V peak ENVIRONMENTAL Meets all M3500A environmental specifications 3500 01 Scanner Card Configuration amp Speed List Channel 1 Channel 2 Channel 3 Channel 4 Channe 5 Channel 6 Channel 7 Channel 8 Channel 9 Channel10 2 9 lt 100 Speed of Scanner Card Measurement AutoZero OFF AutoGain OFF AutoRange OFF Scan Timer 0 60Hz NPLC Take Time with 2000 Readings sec rate ch s Fast 4 5 0 02 68 29 4 single Slow 4 5 amp Fast 5 5 0 1 74 27 0 function VDC Slow 5 5 amp Fast 6 5 1 105 19 0 Slow 6 5 10 408 4 9 AutoZero OFF AutoGain OFF AutoRange OFF Scan Timer 0 60Hz NPLC Take Time with 2000 Readings sec rate ch s Fast 4 5 0 02 306 6 5 Mix function Slow 4 5 amp Fast 5 5 0 1 318 6 3 VDC 2WRES Slow 5 5 amp Fast 6 5 1 442 4 5 Slow 6 5 10 1710 1 2 How to program each channel with measurement function Press CONFIG SHIFT DIGITS for scanning configuration Use and gt to scroll through submen
58. am U1701 Any incorrect read back will cause a test failure This error is only readable from the remote interface 603 Front End MCU does not respond The main CPU U1601 attempts to establish serial communications with the front end processor U2001 Communication must function in both directions for this test to pass 604 A D noisy test failed This test configures to the 10V dc range with 109 the internal OV A 20ms ADC measurement is performed and the result is checked against a limit of OV 20uV 605 N2 calibration parameter failed This error message indicates that N2 calibration parameter is out of range 606 N3 calibration parameter failed This error message indicates that N3 calibration parameter is out of range 607 Buffer1 offset out of range This procedure is to test the offset of buffer U507 The result is checked against a limit of 0 0 1mV 608 Buffer2 offset out of range This procedure is to test the offset of buffer U508 The result is checked against a limit of 0 0 1 609 DC gain x1 failed This procedure is to test the tolerance of DC gainx1 amplifier The limit of gain tolerance is 0 005 610 DC gain x10 failed This procedure is to test the tolerance of DC gainx 10 amplifier The limit of gain tolerance is 0 05 611 DC gain x100 failed This procedure is to test the tolerance of DC gainx100 amplifier The limit of gain tolerance is 0 5 612 Ohms 500 nA source failed This test configures to the 10V dc ran
59. amiliar with those features after reading this chapter 2 1 Setting up Your M3500A Digital Multimeter The purpose of this section is to prepare users for using M3500A DMM You may want to check if you have all the parts with your multimeter All our products are handled and inspected professionally before shipping out to our customers If you find any damaged or missing parts please contact your local service representative immediately and do not attempt to operate the damaged product If users have any doubt about their products they are encouraged to contact their local service representative 2 1 1 To adjust the handle You may adjust the carrying handle to suit your needs The following figures show you how to adjust the handle Taking off the handle from the Multimeter Step 1 Turn up the handle Pull slightly outward on both sides of the handle and slowly rotate it up as shown in Figure 1 1 14 Figure 1 1 Step 2 Pull out the handle When the handle is turned up to 90 with the multimeter please pull out the handle from the multimeter as shown in Figure 1 2 Figure 1 2 II Adjusting the position for your convenience Here are some example positions to suit users needs Position 1 The default position is for packing as shown in Figure 1 3 Figure 1 3 Position 2 The adjusted position is for operation as shown in Figure 1 4 Figure 1 4 Position 3 The carrying position is with
60. angle frames in Figure 4 31 PREV NEXT Figure 4 31 4 4 6 Stepping Step Stepping is scanning with a specified time delay between taking input signal through the defined channels x Note Setting range of scanner card is only limited DCV DCI ACV ACI Frequency Period and Resistance functions How to program each channel with measurement function Press CONFIG SHIFT FILTER for scanning configuration Use 1 and gt to scroll through submenus Press ENTER on SET SCAN CHA submenu Use 4 and to switch from channel 1 to channel 10 and use and V to switch among the measurement functions Leave an unused channel with a blank space Press ENTER when ten channels are all defined 102 How to configure scan count scan interval and store measurement readings Press CONFIG SHIFT FILTER for scanning configuration Use 1 and gt buttons to scroll through submenus Press ENTER to select OPERATION submenu Use 4 and to switch among scan count COUNT scan interval TIMER and store STORE options Then press ENTER on your selection Use 4 and to move through the digits and Aand V to increase or decrease the numbers to a desired value For STORE option you can select ON to instruct the meter to store the measurement results for later retrieving or select OFF Press ENTER to set the value How to open and close the channels
61. asurements when the specified trigger condition requirements are met after it receives the INITiate command The results are sent to the internal memory and stored until you are ready to read them The FETCh command sends the data in the multimeter s internal memory to the output buffer where you can read them into your bus controller 117 The SENSe Commands X NOTE Default parameters are shown in bold italic SENSe FUNCtion VOLTage DC FUNCtion VOLTage DC RATio FUNCtion VOLTage AC FUNCtion CURRent DC FUNCtion CURRent AC FUNCtion RESistance 2 wire FUNCtion FRESistance 4 wire Q FUNCtion FREQuency FUNCtion PERiod FUNCtion CONTinuity FUNCtion DIODe FUNCtion TCOuple FUNCtion TEMPerature FUNCtion SENSe VOLTage DC RANGe lt range gt MI Nimum MAXimum VOLTage DC RANGe MI Nimum MAXimum VOLTage AC RANGe lt range gt Nimum MAXimum VOLTage AC RANGe MI Nimum MAXimum CURRent DC RANGe lt range gt MI Nimum MAXimum CURRent DC RANGe MI Nimum MAXimum CURRent RANGe range MI Nimum CURRent AC RANGe MI Nimum MAXimum RESistance RANGe lt gt Nimum MAXimum RESistance RANGe MI Nimum MAXimum FRESistance RANGe range MI Nimum FRESistance RANGe MI Nimum MAXimum FREQuency VOLTage RANGe lt range gt MINimum MAXimum FREQuenc
62. belong to read only registers and report defined conditions in a multimeter Bits are latched in the event registers As long as an event bit is set subsequent state changes will be ignored Besides bits in an event register are cleared automatically by the commands for example ESR STAT QUES EVEN or CLS Please note that the reset command RST or device clear in event registers won t clear bits To query an event register will return a decimal value corresponding to binary weighted sum of all bits set in the register An enable register is readable and writable and can define which bits in the corresponding event register are ORed together to generate a single summary bit To query an enable register won t clear it as well the command CLS but it can clear the bits in the event registers And the command STATus PRESet will clear the questionable data enable register Moreover to enable bits in an enable register users have to write a decimal value corresponding to the binary weighted sum of the bits in the register by their demands Binary Weights 160 Questionable Data Event Register Enable Register STAT QUES EVEN STAT QUES ENAB value 6 STAT QUES ENAB Standard Event Serial Poll SPOLL Event Register Enable Register Operation Complete Not Used 2 Query Error Output Buffer 3 Device Error YY 4 Execution Enor Qo 5 Command Error 7 Power On O O ESR E
63. cation in the last AppWizard step LI STI NG C 3 THE DEVQUERY FUNCTION 180 devquery cpp Defines the entry point for the console application Call the NI VISA library visa32 dll Lf include stdafx h include visa h standard include for a Microsoft Visual C project include stdio h include windows h void main int argc char argv TODO Add your control notification handler code here HINSTANCE hUSBTMCLIB for USBTMC HANDLE unsigned long m defaultRM usbtmc m instr usbtmc unsigned long m findList usbtmc unsigned long m nCount ViStatus status int m Timeout 7000 char pStrout Write out data buffer BYTE pStrin 64 Read in data buffer int len ULONG nWritten ULONG nRead 0 char buffer 256 char instrDescriptor 256 Load the NI VISA library for USBTMC device hUSBTMCLIB LoadLibrary visa32 dll if IRUSBTMCLIB MessageBox NULL NIVISA for USBTMC library not found M3500 181 multimeter device test MB OK return Link the libraries signed long stdcall PviOpenDefaultRM usb unsigned long signed long __ stdcall PviFindRsrc usb unsigned long sesn char expr unsigned long vi unsigned long retCnt char far desc signed long stdcall PviOpen usb unsigned long sesn char name unsigned long mode unsigned long timeout unsigned long vi signed long stdcall PviClose usb unsigned
64. couple type and unit using CONFIG SHIFT TEMP such as K TYPE and 2C When ready press ENTER button Press SHIFT TEMP buttons 5 Take the reading on the display Figure 3 12 3 7 2 RTD Measurements There are three kinds of temperature measurements with RTDs 2 wire 3 wire and 4 wire measurements You will find connection instructions and measuring procedures in the following sections 44 3 7 2 1 2 Wire RTD Measurements How to measure temperature with 2 Wire RTD The following Figure 3 13 shows theory diagram of 2 Wire RTD measurement D Use terminals switch to select front terminals 2 Insert a specified adapter into the front terminals Connect the low thermal patch leads to the adapter as shown in Figure 3 14 3 Configure sensor type and unit using CONFIG TEMP and 4 or When ready press ENTER button Press TEMP button 5 Place in the desired position and take the reading on the display PICOTEST M3500A Platinum RTD Note Source current flows from the INPUT HI to INPUT LO terminals Figure 3 13 45 4 PICOTEST M3500A Figure 3 14 3 7 2 2 3 Wire RTD Measurements How to measure temperat
65. device clear message See DTR DSR Handshake Protocol for further details TALK ONLY for Printers You can set the address to 31 which is the talk only mode In this mode the multimeter can output readings directly to a printer without being addressed by a bus controller over either HP IB or RS 232 For proper operation make sure your printer is configured in the listen always mode Address 31 is not a valid address if you are operating the multimeter from the HP IB interface with a bus controller 172 If you select the RS 232 interface and then set the HP IB address to the talk only address 31 the multimeter will send readings over the RS 232 interface when in the local mode D About Application Programs This section provides a brief description for each M3500A sample collection Visual Basic Learn how to create and use PICOTEST lOUtils components controls data access and more with the Visual Basic sample applications For an overview and installation details see Visual Basic Explore the Samples Visual C In MFC application you can override PI COTEST I OUtils interfaces in class as well as provide additional interfaces The example in this article illustrates how to override an interface in a class while preserving the original interface implementation so that it can be delegated to by the new interface implementation Browse the Visual C samples code see Visual C DEVQUERY Sample Application Usi
66. e Remote Interface Operation Use the following commands to set up the thermocouple configuration SENSe UNI T Cel Far SENSe UNI T 5 5 E J K N R S T sENSe TCOuple SI Mulated value Nimum 4 1 9 Remote I nterface Selection The multimeter supports both GPIB and USB interfaces but only one interface can be activated at a time If you are using GPIB you must set the address for the multimeter You can set the address to any value from 0 and 31 The address is set to 11 when the multimeter is shipped from the factory X Note The remote interface can only be set through the front panel operations How to select a remote interface Press MENU and then use and to select INTERFACE Then Press 66 ENTER on your choice of USB or GPIB interface How to set address when using GPIB Press MENU and then use lt and to access INTERFACE Select GPIB to set address Use 4 gt Aand V to adjust the numbers to the desired address Press ENTER to set it 4 1 10 Input Terminal Switch Definition User can select either the front input terminals or the rear input terminals for their measurements There are 5 input terminals in the front panel as well as the rear panel If the rear terminal is enabled the REAR annunciator at the upper side will be shown Default The default situation is the front terminals How to switch the terminals To switch between t
67. e bit automatically in the status byte summary register but no other bits are affected i e to perform a serial poll won t affect instrument throughput Note The synchronization between the bus controller program and the instrument isn t able to be ensured by the IEEE 488 2 standard So users can apply the OPC command to ensure that commands sent to the instrument previously have completed And to execute a serial poll before applying RST CLS or other commands have completed can let pervious conditions be reported Read the Status Byte by using STB The STB command status byte query is like a serial poll except it acts similar to any other instrument command This command returns the same result as an IEEE 488 serial poll except that the request service bit 6 isn t cleared if a serial poll has occurred And the IEEE 488 bus interface hardware can t automatically handle the STB command It will work only after previous commands have completed and it s impossible to poll by using the STB command Moreover to use this command doesn t clear the status byte summary register Procedures of I nterrupting the Bus Controller by Using SRQ Send a bus device clear message Clear the event register by using the CLS command Set the ESE and SRE commands to enable masks Send the OPC command and enter the result to enable synchronization e Enable the bus controller s IEEE 488 SRQ interrupt Procedures to D
68. e default integration time is 1 PLC The user selected value is stored in a volatile memory and the default value will be restored when the meter is power off How to set the integration time You can set the integration time either through the front panel operation or through the remote interface operation Front Panel Operation Integration time is set indirectly when user selects the measurement resolution Please refer to chapter 4 1 3 for details about how to set resolution or the digits Table 4 1 on page 51 shows the relationship between the resolution and the integration time 63 Remote Interface Operation Use the following commands on your PC terminal to set the resolution CONFigure lt function gt lt range gt lt resolution gt MEASure lt function gt lt range gt lt resolution gt SENSe lt function gt RESolution lt resolution gt Or you can set integration time directly by the following commands SENSe VOLTage DC NPLCycles 0 02 0 1 1 10 MI Nimum SENSe VOLTage DC NPLCycles MI Nimum MAXimum SENSe CURRent DC NPLCycles 0 02 0 1 1 10 MI Nimum SENSe CURRent DC NPLCycles MI Nimum MAXimum SENSe RESistance NPLCycles 0 02 0 1 1 10 Nimum MAXimum SENSe RESistance NPLCycles MI Nimum MAXimum SENSe FRESistance DC NPLCycles 0 02 0 1 1 10 Nimum SENSe FRESistance DC NPLCycles MI Nimum MAXimum For frequency and period measurements apertur
69. e enable register all of the conditions can be reported in the questionable data summary bit At the moment users have to write a decimal value by using the STATus QUESTionable ENABle command to set the enable register mask Bit Definitions for Questionable Data Register Decimal Bit Definition Value Range overload on dc ac volts frequency period diode or ratio O voltage Overload 1 function 1 Current Overload 2 Range overload on dc ac current function 2 Not Used 4 Set to 0 3 Not Used 8 Set to 0 4 Not Used 16 Set to 0 5 Not Used 32 Set to 0 6 Not Used 64 Set to 0 7 Not Used 128 Set to 0 8 Not Used 256 Set to 0 Ohms Overload 512 Range overload on 2 4 wired ohm function 10 Not Used 1024 Set to0 11 Limit Failed at Lo 2048 Reading is less than lower limit under limit test 12 Limit Failed at HI 4096 Reading is excess upper limit under limit test 13 Not Used 8192 Set to 0 14 Not Used 16384 Set to0 15 Not Used 32768 Set to0 166 The following conditions will clear the questionable data event register Users execute a CLS command Users query the event register by using STATus QUEStionable EVENt The following conditions will clear the questionable data enable register Users turn on the power without using PSC command Users execute the STATus PRESet command Users execute the STATus QUEStionable ENABle 0 command C 10
70. e fixed at 1kQ and 5 digits respectively CONFigure DI Preset and configure for a diode measurement This command does not initiate the measurement The range and resolution are fixed at 1Vdc with 1mA current source and 5 digits respectively CONFigure TEMPerature Preset and configure for a RTD measurement This command does not initiate the measurement The resolution is fixed at 6 digits CONFigure TCOuple Preset and configure for a thermocouple measurement This command does not initiate the measurement The resolution is fixed at 6 digits CONFigure Query a recent condition of function and return a quoted string C 5 The Measurement Configuration Command SENSe FUNCtion lt function gt Select a measurement function and enclose it in quotes in the command string FUNC VOLT DC Use one of the following strings VOLTage DC VOLTage AC VOLTage DC RATio CURRent DC CURRent AC RESistance for 2 wire ohms FRESistance for 4 wire ohms FREQuency PERiod CONTinuity DIODe TCOuple TEMPerature SENSe FUNCtion Query the measurement function and return a quoted string SENSe function RANGe lt range gt MINimum MAXimum 146 Select a range for the selected function For frequency period measurements range applies to the signals input voltage not its frequency use FREQuency VOLTage or PERiod VOLTage MIN selects the lowest range for the selected function MAX selects the high
71. e fuse of current input Note To eliminate the thermal EMFs due to the differences between two metals use copper leads to connect your source signal to the meter How to measure current D Selects input signal connections on front or rear panel 2 Connect the test leads to the terminals as shown in Figure 3 4 3 Set RESOLUTION of Refer to 4 1 3 BANDWIDTH of ACI Refer to 4 1 2 1 or skip this step if default is to be used Press SHIFT DCV or SHIFT ACV buttons for DCI or ACI measurement 36 Select the auto range function by pressing AUTO button on the front panel or use and V buttons to select desired range 6 Connect test leads to your source signal and observe the reading shown on the display If the input signal is greater than the allowed range an overflow message OVLD will be displayed PICOTEST M3500A pt OTEST Current Source ho Warning Maximum Input 3A DC or RMS Figure 3 4 Note The rear terminal panel also can be used via the same procedures as the front panel See Figure 3 5 PICOTEST M3500A Rear Panel CM Current Measurement Figure 3 5 37 3 3 Resistance Measurements 2 amp 4 wire The ranges for resistance measurement 100 2 1KQ 10k 100kQ 1 10 and 100MQ with a sensitivity of 100 uQ on 100 Q range There are t
72. e time or gate time is analogous to integration time and you can use the following commands to set it Specify 10 ms 4 5 digits 100 ms default 5 5 digits or 1 second 6 5 digits SENSe FREQuency APERture 0 01 0 1 1 Nimum SENSe FREQuency APERture MI Nimum MAXimum SENSe PERiod APERture 0 01 0 1 1 MI Nimum MAXimum SENSe PERiod APERture MI Nimum MAXimum 4 1 8 Sensor Selection for Temperature Measurements The multimeter supports both thermocouple and RTD User needs to configure the multimeter for the right sensor type before they can make temperature measurements 64 RTD Definition If you are using RTD the options are PT100 D100 F100 PT385 PT3916 user defined RTD NTCT and SPRTD If you need to change the factors that are used to calculate the temperature in RTD choose user defined RTD in which you are able to change any factors as you wish The default factors used are listed in Table 4 3 Table 4 3 Type Alpha Beta Delta R zero PT100 0 003850 0 10863 1 49990 1000 0100 0 003920 0 10630 1 49710 1000 100 0 003900 0 11000 1 49589 1000 385 0 003850 0 11100 1 50700 1000 3916 0 003916 0 11600 1 50594 1000 NTCT 0 003850 0 10863 1 49990 1000 Here is the temperature equation that is used to determine the RTD temperature When t lt 0C R R l At Br ce r 100 When 0 C lt t lt 630 C R R 1 At A of 2 100 107 C af 1
73. e value when Min Max is turned on when the power has been off or a remote interface reset CALCulate PERCent TARGet MI Nimum MAXimum Query the target value for percent math function CALCulate AVERage MI Nimum 153 Read the minimum value found during the Min Max operation The multimeter clears the value when Min Max is turned on when the power has been off or a remote interface reset CALCulate AVERage MAXimum Read the maximum value found during the Min Max operation The multimeter clears the value when Min Max is turned on when the power has been off or a remote interface reset CALCulate AVERage AVERage Read the average value of all readings taken since the Min Max operation has been enabled The multimeter clears the value when Min Max is turned on when the power has been off or a remote interface reset CALCulate AVERage COUNt Read the number of readings taken since Min Max has been enabled The multimeter clears the value when Min Max is turned on when the power has been off or a remote interface reset CALCulate NULL OFFSet value Store a null value in the multimeter s Null Register You must turn on the math operation before writing to the math register You can set the null value to any number between 0 and 120 of the highest range CALCulate NULL OFFSet Query the null value CALCulate LI Mit LOWer value Nimum MAXimum Set the lower
74. eading of range 1 Year Function Range Resolution i Hz 23 C 5 C ACV AC 3 5 1 00 0 04 100 0000mv 0 1 uV 5 10 0 35 0 04 Voltage 10 20K 0 06 0 04 20 50K 0 12 0 05 7 Specifications are for 6 digits and two hours warm up slow AC filter 3 Hz Bandwidth sine wave input 8 20 over range on all ranges except 750 Vac range 9 Specifications are for sine wave input gt 5 of range When the inputs are from 1 to 5 of range and 50 KHz add the additional error for 0 1 of range For 50 KHz to 100 KHz add 0 13 of range 135 50K 100K 0 60 0 08 100K 300K 4 00 0 50 3 5 1 00 0 03 5 10 0 35 0 03 1 000000V 10 20K 0 06 0 03 1 0 uV To 20 50K 0 12 0 05 750 000V To 10 50K 100K 0 60 0 08 1mV 100K 300K 4 00 0 50 3 5 1 00 0 04 1 000000A 1 uV 5 10 0 30 0 04 ACI 10 5K 0 10 0 04 3 5 1 10 0 06 3 000000A 10 uV 5 10 0 35 0 06 10 5K 0 15 0 06 B General Specifications item Limitation amp description Power Supply 100V 120V 220V 240V 10 50 60 Hz 10 Power Line Frequency 10 750Vac range is limited to 100 KHz 11 Specifications are for sine wave input gt 5 of range When the inputs are from 1 to 5 of range and lt 50 KHz add the additional error for 0 1 of range For 50 KHz to 100 KHz add 0 13 of range 136 Power Consumption 25 VA peak 1
75. eal panel VM COMP terminal provides a low true pulse after finishing each measurement The VM COMP and external trigger shown below provides a standard hardware handshake sequence between measuremen and switching devices Output 5 db Dv E Approximately 2 Us 73 Remote Interface Operation By software or internal trigger By software trigger The software trigger is similar to the single triggering but instead of using the SINGLE button on the front panel you send a command from your PC to the multimeter to generate an event For using software trigger use the following command from your PC terminal to set trigger source TRI Gger SOURce BUS By internal trigger The internal trigger is the default trigger mode for the Remote Interface Operation In the internal trigger mode a trigger signal will be issued whenever the multimeter is in the wait for trigger state To set the internal trigger use the following command from your PC terminal TRI Gger SOURce I MMediate 4 2 3 Trigger Setting In M3500A user can specify a variety of trigger settings including the number of samples per trigger the number of triggers per event reading hold and the trigger delay for their measurements A Number of samples on each trigger By default the multimeter takes only one reading on each trigger but you can instruct the multimeter to take specific number up to 50000 of readings each time it receives a trigger The user s input s
76. ease don t use a damaged Test Lead Set against the instrument break or personal injury 1 8 Options and Accessories The following options and accessories are available from PI COTEST for use with the Model M3500A Please refer to the following Table 1 1 Table 1 1 Part Name Part Number Multi point Scanner Card 3500 01 Thermocouple adapter 3500 02 Adapters Banana to BNC Adapter M3500 opt03 GPIB Card M3500 opt04 RTD Probe Adapter M3500 opt05 RS232 Adapter M3500 opt06 Kelvin Probe 3500 07 12 1 9 M3500A s Dimension Please get the dimension s information in the following different ways 1 The dimension without the handle and the front amp Rear Bumpers is in the following Picture 1 LxWxD 213 6x88 6x370 mm 2 The dimension with the handle and the front amp Rear Bumpers is in the following Picture 2 LxWxD 255x113x373 mm 3 The dimension with the front amp Rear Bumpers but without the handle is in the following Picture 3 LXWxD 224x113x373 mm 370 0mm c Lr xm Q 255 0mm 373 0mm 113 0mm 4 oo o oo o oo 5 224 0mm 373 0mm 113 0 13 2 Overview This chapter will give you an overview of M3500A s basic features and guide you through the basics of M3500A digital multimeter Users will become f
77. ecify the resolution in the same units as the measurement function not in number of digits For instance specify the resolution in vots and the frequency in hertz The examples are in the following CONF VOLT DC 10 0 001 4 1 2 digits on the 10 Vdc range MEAS CURR AC 1 1E 6 6 1 2 digits on the 1 A range CONF FREQ 1 KHz 0 1 Hz 1000 Hz input 0 1 Hz resolution VOLT AC RES 0 05 50 mV resolution on the ac function 4 1 4 DC Input Resistance Definition To reduce the effect of loading errors due to the input resistance M3500A allows user to select a much larger input resistance gt 10G Q for low input DC voltage 100mV 1V and 10V measurements This feature is only available for DC voltage measurements and it is not applicable to other measurement functions Default The default input resistance for all measurements is 10M Q Please refer to Table 2 1 on page 24 The DC input resistance can only be changed for measurements with 100mV 1V or 10V range For 100V DCV 1000 V DCV and other measurement functions the input resistance is fixed at 10M and can not be changed Also note that the user selected value is stored in a volatile memory The default setting will be restored after the meter has been turned off 59 How to set the DC input resistance You can set the DC input resistance either through the front panel operation or through the remote interface operation Front Panel Operation Press CONFIG DCV and then use l
78. ed when power has been off or after a CLS clear status command has been executed The RST reset command does not clear the error queue 6 1 Error Type There is only one type over here execution errors If the errors user can t find here please contact with your seller for help 6 1 1 Execution Errors e 101 Invalid character An invalid character was found in the command string 102 Syntax error Invalid syntax was found in the command string 103 Invalid separator An invalid separator was found in the command string 104 Data type error A parameter type error was found in the command string 105 GET not allowed 126 A Group Execute Trigger GET is not allowed in the command string 108 Parameter not allowed More parameters were found than needed for the command 109 Missing parameter Not enough parameters were received for the command 112 Program mnemonic too long A command header with too many characters was received 113 Undefined header An invalid command was received e 121 Invalid character in number An invalid character was found in the number specified for a parameter value 123 Numeric overflow A numeric parameter with exponent larger than 32000 was found 124 Too many digits A numeric parameter was found whose mantissa contained more than 255 digits excluding leading zeros e 131 Invalid suffix A suffix was incorrectly specified for a numeric
79. efects caused by improper installation improper or insufficient maintenance unauthorized modification improper operation ignorance of environmental specifications or improper software or interfacing 4 Remarks No other warranty is expressed or implied except for the above mentioned The remedies provided herein are the buyer s sole and exclusive remedies PI COTEST shall not be liable for any direct indirect special incidental or consequential damages Limitation of warranty 1 Our warranties do not cover any damage resulting from unauthorized modification or misuse 2 Unless mentioned elsewhere in this document our warranty does not apply to fuses probes and problems arising from normal wear or user s failure to follow instructions 3 Our warranties do not apply on any direct incidental special or consequential damages 4 The above warranties are exclusive and no other warranty is expressed or implied PICOTEST disclaims any implied warranties of MERCHANTABILITY SATISFACTORY QUALITY and FITNESS for any particular reasons 1 3 Precaution of Operation Please carefully read the manual before operating this device This manual is for reference only Please consult your local service representative for further assistance The contents of this manual may be amended by the manufacturer without notice Never dismantle the equipment by any unauthorized personnel or equipment may be damaged The equi
80. egister Decimal Bit Definition Value All commands prior to and including an OPC command have been Operation Complete 1 executed 1 Not Used 2 Set to 0 The DMM output buffer was empty as the DMM tried to read from it 2 Query Error 4 Or a new command line was received before a previous query has been read Or both the input and output buffers are full 3 Device Error 8 Error occurrence from a self test calibration or reading overlaod 4 Execution Error 16 Error occurrence from an execution 5 Command Error 32 Error occurrence from a command s syntax 6 Not Used 64 Set to 0 Since the last time the event register was read or cleared power has 7 Power On 128 been turned off and on The following conditions will clear the standard event register Users send a CLS command Users query the event register by using the ESR command The following conditions will clear the standard event enable register Users turn on the power and have set the DMM previously by using the PSC 1 command 165 Users execute ESE 0 command X Note When the DMM is powered on the standard event enable register won t be cleared if users have set the DMM previously by using PSC Q About the Questionable Data Register The questionable data register reports the quality of the DMM s measurement results as well overload conditions and high low limit test results Through th
81. ein conforms with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC including 93 68 EEC and goes with the CE Marking accordingly Conformity with the following product standards Manufacturer Name Picotest Corp Manufacturer Address 5F 1 286 9 Rd 80673 Kaohsiung Taiwan Declaration of product Product Name 6 Digit Digital Multimeter Model Number M3500A Product Accessories This declaration applies to all accessories of The above product s Conformity with the following European Directives The product herein conforms with the requirements of the Low Voltage Directive 73 23 EEC and EMC Directive 89 336 EEC including 92 31 EEC and 93 68 EEC and goes with the CE Marking accordingly Conformity with the following product standards EMC EN61326 1997 A1 1998 A2 2001 A3 2003 EMI CISPR 11 1997 A1 1999 A2 2002 Class B IEC61000 3 2 2000 61000 3 3 1994 1 2001 EMS IEC61000 4 2 1995 A1 1998 A2 2000 IEC61000 4 3 2002 IEC61000 4 4 2004 61000 4 5 1995 1 2000 IEC61000 4 6 1996 A1 2000 61000 4 8 1993 1 2000 1 61000 4 11 1994 1 2000 Safety IEC61010 1 2001 EN61010 1 2001 2 d Edition UL61010 1 2004 gt C t f 7 5 22 Aug 2005 lt j AWE 22741 CFL Date Hawk Shang General Manager For more information please contact your local supplier sales office or distributor 189
82. elect it Then again use lt and buttons to find READ HOLD submenu Press ENTER to choose it Then use lt and buttons to choose a desired band Press ENTER to set the desired sensitivity band The locations of the buttons are shown with red rectangle frames in Figure 4 30 MENU PREV NEXT ENTER Figure 4 30 4 4 5 Scanning Scan User can purchase an optional internal scanner card to be used with M3500A as the following picture shown This multipoint scanner card lets you switch and scan up to 10 channels of input signals User can open and close individual channels set scan count and scan interval store measurement readings and activate measuring through channels defined with different measurement functions The measurements are taken through all defined channels in sequence The scan count limits the 98 total number of measurements the multimeter makes through defined channels in one single scanning operation The scan interval is the period of time the multimeter waits before it makes a measurement through the first defined channel The configuration made by user is stored in a volatile memory and will be cleared after the meter is turned off PICOTEST M3500A Source Hote This card must be insert into PICOTEST 3500 XxX Note The output 2 is only for 4 wired resistance measurement Please refer to the above picture for m
83. elector from the right middle seam as shown in Figure 2 3 You might need a screwdriver to do so 18 2 Figure 2 3 Step 4 Turn it over to 220V position as shown in Figure 2 4 Figure 2 4 Step 5 Insert the voltage setting selector back into the socket and close the cap as shown in Figure 2 5 gd Figure 2 5 19 2 1 2 2 To change the fuse Warning Before replacing the power line fuse make sure the multimeter is disconnected from the AC power You must be a qualified personnel to perform this action Warning For continued protection against fire or instrument damage only replace fuse with the same type and rating If the instrument repeatedly blows fuses locate and correct the cause of the trouble before replacing the fuse Verify that the power line fuse is good Replace the fuse if it is damaged Use only the same type and same rating fuse noted on the rear panel Please follow the steps below to change the fuse Step 1 Verify that the meter is disconnected as shown in Figure 2 6 gt Figure 2 6 20 Step 2 Open the voltage setting selector cap as shown in Figure 2 7 You might need a screwdriver to do so Figure 2 7 Step 3 Remove the red voltage setting selector from the right middle seam as shown in Figure 2 8 You might need a screwdriver to do so Figure 2
84. em associated commands are grouped together under a common node or root thus forming subsystems A portion of the SENSe subsystem is shown below to illustrate the tree system SENSe VOLTage DC RANGe lt range gt MI Nimum MAXimum VOLTage DC RANGe MINimum MAXimum FREQuency VOLTage RANGe lt gt FREQuency VOLTage RANGe MINimum MAXimum DETector BANDwidth 3 20 200 MINimum MAXimum DETector BANDwidth MINimum MAXimum ZERO AUTO OFF ONCE ON ZERO AUTO SENSe is the root keyword of the command VOLTage and FREQuency are second level keywords and DC and VOLTage are third level keywords A colon separates a command keyword from a lower level keyword Command Format Used in This Manual The format used to show commands in this manual is shown below 136 VOLTage DC RANGe lt gt MI Nimum The command syntax shows most commands and some parameters as a mixture of upper and lower case letters The upper case letters indicate the abbreviated spelling for the command For shorter program lines send the abbreviated form For better program readability send the long form For example in the above syntax statement VOLT and VOLTAGE are both acceptable forms You can use upper or lower case letters Therefore VOLTAGE volt and Volt are all acceptable Other forms such as VOL and VOLTAG will generate an error Braces
85. enable the auto zero mode The OFF and ONCE have a similar effect OFF mode does not issue a new offset measurement until the multimeter goes to the WAIT FOR TRIGGER state Parameter ONCE issues an immediate offset measurement SENSe ZERO AUTO Query the auto zero mode Returns 1 ON or O OFF or ONCE SENSe GAIN AUTO OFF ONCE ON Disable or enable the auto gain mode The OFF and ONCE have a similar effect OFF mode does not issue a new offset measurement until the multimeter goes to the WAIT FOR TRIGGER state Parameter ONCE issues an immediate offset measurement SENSe GAIN AUTO Query the auto gain mode Returns 1 ON or O OFF or ONCE I NPut I MPedance AUTO OFF ON Disable or enable the automatic input resistance mode for DC voltage measurements With AUTO ON the input resistance is set to gt 10GQ for the 100mV 1V and 10V ranges With AUTO OFF the input resistance is fixed at 10 for all ranges I NPut I MPedance AUTO 151 Query the input resistance mode Returns 1 ON or O OFF ROUTe TERMinals Query the multimeter to determine if the front or rear input terminals are selected Returns FRON or REAR ROUTe CLOSe channel Set channels which need to be closed lt The range is from channel 1 to 10 gt ROUTe CLOSe Query channels which were closed ROUTe OPEN Open all channels ROUTe STATe Read the state after scanning The state display is 1 means
86. erature TRANsducer FRTD Set the RTD Measurement to 4 Wire SENSe TEMPerature TRANsducer RTD Set the RTD Measurement to 2 Wire SENSe function NPLCycles 0 02 0 1 1 10 MI Nimum MAXimum Set the integration time in number of power line cycles for the selected function This command is valid only for DCV DCI 2 wire ohms and 4 wire ohms SENSe function NPLCycles MI Nimum MAXimum Query the integration time for the selected function SENSe FREQuency APERture 0 01 0 1 1 Nimum Set the gate time or aperture time for frequency function Specify 10 ms 4 5 digits 100 ms default 5 5 digits or 1 second 6 5 digits SENSe FREQuency APERture MI Nimum MAXimum Query the gate time or aperture time for frequency function SENSe PERiod APERture 0 01 0 1 1 MI Nimum MAXimum 150 Set the gate time or aperture time for period function Specify 10 ms 4 5 digits 100 ms default 5 5 digits or 1 second 6 5 digits SENSe PERiod APERture MI Nimum MAXimum Query the gate time or aperture time for period function SENSe DETector BANDwidth 3 20 200 MI Nimum MAXimum Specify the lowest frequency expected in the input signal The meter selects the slow medium or fast ac filter based on the frequency you specify SENSe DETector BANDwidth MI Nimum MAXimum Query the ac filter and return the bandwidth SENSe ZERO AUTO OFF ONCE ON Disable or
87. ess CONFIG button and then CONT button Use 4 and gt buttons to move through the digits and lower or increase the number to your desired value using and V buttons then press ENTER button to set the value The locations of these buttons are shown with red rectangle frames in Figure 4 5 CONFIG PREV NEXT gt 4 Y ems A um ENTER Wc m TGC Figure 4 5 4 1 6 Range Manual amp Auto Definition When making measurements except CONT DIODE and Temperature you can let the machine choose ranges for you or you can select the 61 appropriate ranges manually by yourself The difference between auto range and manual range is the settling time Auto range is a convenient way for user but manual range can usually speed up the process If the input signal is beyond allowed range an OVLD message will be shown on the display The thresholds of maximum minimum readings for each range are 120 of the range for maximum and 10 of the range for minimum Default The default is auto range The user selected range is stored in volatile memory and the default will be restored when the meter is power off Please refer to Table 2 1 on page 24 for the factory default range How to set the auto manual range You can set the auto manual range either through the front panel operation or through the remote interface ope
88. est range SENSe function RANGe MI Nimum MAXimum Query the range for the selected function For frequency and period use FREQuency VOLTage or PERiod VOLTage Autorange thresholds Down range at 1096 of range Up range at gt 120 of range SENSe function RANGe AUTO OFF ON Disable or enable autorange for the selected function SENSe function RANGe AUTO Query the autorange setting Return 1 ON or 0 OFF SENSe function RESolution lt resolution gt MI Nimum MAXimum Set resolution for the selected function not valid for frequency period or ratio Specify the resolution in the same units as the measurement function not in number of digits MIN selects the smallest value accepted which gives the most resolution MAX selects the largest value accepted which gives the least resolution SENSe function RESolution MI Nimum MAXimum Query the resolution for the selected function SENSe UNIT Cel Far K Select units for temperature measurement Cel means Celsius Far means Fahrenheit and K means Kelvin SENSe UNI T Query units for temperature measurement SENSe TCOuple TYPE E J K NJR S T Select thermocouple sensor type SENSe TCOuple TYPE 147 Query thermocouple sensor type SENSe TCOuple RJ UNction RSELect REAL SI Mulated Select a reference junction type real or simulated SENSe TCOuple RJ UNction RSELect Query the re
89. etermine When a Command Sequence is Completed Clear the DMM s output buffer by sending a device clear message Clear the event registers by using CLS command 163 Enable operation complete by using the ESE 1 command Send the OPC command and enter the result to enable synchronization When bit 5 is set in the status byte summary register please use a serial poll to check Then users could set the DMM for an SRQ interrupt by using SRE 32 Usage of the Messages Available Bit MAV Users can use the status byte message available bit 4 to decide when data is available to read in the bus controller When the first reading trigger occurs by using the command TRI Gger SOURce IMMediate the DMM will automatically enable the bit 4 The DMM will clear bit 4 only after entire messages have been read from the output buffer The MAV bit can indicate only when the first reading is generated by the READ command So this will be helpful for users as a trigger event such as BUS or EXTernal will occur In addition the MAV bit is set only after all specified measurements have completed by using the INITiate and FETCH commands That means in detail the ate command is used to store readings in the DMM s internal memory And the FETCH command is used to transfer readings to the DMM s output buffer Signal by Using OPC When Data is in the Output Buffer Normally to use the operation complete bit 0 in
90. etting is stored in a volatile memory which will be cleared after the meter has been turned off and the default value will be restored You can set the number of samples on each trigger through front panel or the remote interface Front Panel Operation Press MENU button and locate TRIG submenu by pressing lt and buttons Press ENTER to choose TRIG option Again locate N SAMPLE submenu using lt and buttons and then press ENTER to select it Then set the desired number by pressing V buttons to increase or decrease the number and using lt and gt buttons to move through 74 the digits The locations of these buttons are shown with red rectangle frames in Figure 4 11 Procedures MENU TRIG SAMPLE lt Number gt MENU PREV NEXT gt 4 ENTER Figure 4 11 Remote I nterface Operation Use the following command to set the number of samples from your PC terminal SAMPIe COUNt value B Number of triggers Although the meter normally takes one trigger before returning to the idle state user can manually specify the number of triggers it accepts before the idle state However this can only be done through the remote interface The following command show how to set multiple triggers per returning idle state TRI Gger COUNt C Reading hold The reading hold feature is used to hold a stable reading on the display When a reading
91. evices are in the proper positions Do not apply excessive voltage to the Multimeter Apply voltage within the rated range only Use caution when measuring voltages above 30 V RMS 42 V peak or 60 V DC These voltages pose an electric shock hazard When using the probes always keep your fingers behind the finger guards Always connect the common test leads black before connecting the live test leads red and disconnect the live test leads red before disconnecting the common test leads black This will reduce the chance of an electric shock Disconnect circuit power and discharge all high voltage capacitors before testing resistance continuity diodes or capacitance you need to open the Meter case or replace any parts read the instruction in this manual first You must be a qualified personnel to perform this action When replacing fuses use only the same type and same rating as specified Do not try to operate the Meter if it is damaged Disconnect the power from the equipment and consult the local service representative Return the product to PI COTEST service department if necessary 1 6 Symbols and Terms TN si symbol indicates hazards that may cause damages to the instrument or even result in personal injury This symbol indicates high voltage may be present Use extra caution before taking any action rh This symbol indicates the frame or chassis terminal presented need to be connected to the actual ea
92. f The internal settings of automatic trigger delay The delay time for automatic trigger delay is determined by the selection of measurement function range and the setting of integration time and 76 AC filter speed The following table shows the default delay time for each measurement setting Table 4 4 Trigger Delay Measurement Function Time DCV DCI 1002 100 1 5 ms Q2 and Q4 PLC gt 1 Q2 and Q4 Remote Interface External Trigger Single Trigger ACV ACI Front Panel w Auto Trigger On Remote Interface External Frequency Period Front Panel w Auto Trigger ON How to specify a delay time User can set the delay time from either the front panel operations or the remote interface operations 77 Front Panel Operation set the delay time press MENU button and use lt and buttons to locate TRIG option Press ENTER to select it Then again find DELAY option using lt and buttons Press ENTER to select it Then use lt and gt buttons to move through the digits and A and V buttons to set the desired delay time between 0 to 3600 second The locations of the buttons are shown with red rectangle frames in Figure 4 13 PREV NEXT ENTER Figure 4 13 AUTO Remote Interface Operation You can also use the remote interface operations from your PC terminal to set the trigger
93. fList stat viClose dfltRM MsgBox End of J ob End Sub Using CONFigure with a Math Operation The following example uses CONFigure with the dBm math operation The CONFigure command gives you a little more programming flexibility than the MEASure command This allows you to incrementally change the multimeter s configuration The example is is shown in Visual Basic Creating the Application Create a new Visual Basic project as follows 1 Create a new Standar EXE project 2 To set the startup object for a Windows Application to Sub Main 3 Add New Module Declare a Sub Main LI STI NG C 2 THE CONFigure FUNCTION Public Declare Sub Sleep Lib kernel32 ByVal dwMilliseconds As Long Sub main Rem 3E ETE TE EE HE HE EHE EHE TEE HE E HE HE EHE EE HE HE EHE EHE HE HE HE EE HE HE EHE EE HE E Rem Rem Using NI VISA library visa32 dll Rem Rem Set sample count 5 configuration and Rem read the trigger Rem Rem 3E JEJE TE HE HE TEE EE HE HE EHE EE HE HE EHE EHE HE HE EHE EE HE HE HE EE HE HE EHE EE HE E 177 Dim stat As ViStatus Dim dfltRM As ViSession Dim sesn As ViSession Dim fList As ViFindList Dim desc As String VI FIND BUFLEN Dim nList As Long Dim ret As Long Dim readin As String 128 Dim i As Integer Array index stat viOpenDefaultRM dfltRM If stat VI SUCCESS Then Rem Error initializing VISA exiting MsgBox USBTMC resource not found vbExclamation M3500 multimeter device
94. ference junction type real or simulated SENSe TCOuple RJ UNction SI Mulated lt value gt MI Nimum MAXimum Set the default temperature of the simulated reference junction SENSe TCOuple RJ UNction SI Mulated Query the default temperature of the simulated reference junction SENSe TCOuple RJ UNction REAL OFFSet value MI Nimum MAXimum Set the offset voltage of the real reference junction SENSe TCOuple RJ UNction REAL OFFSet MI Nimum MAXimum Query the offset voltage of the real reference junction SENSe TEMPerature RTD TYPE PT100 D100 F100 PT385 PT3916 USER SPRTD NTCT Select the RTD type for temperature measurement with RTD SENSe TEMPerature RTD TYPE Query the RTD type for temperature measurement with RTD SENSe TEMPerature RTD RZERo lt value gt MINimum MAXimum Set the R Zero constant for the user defined RTD type SENSe TEMPerature RTD RZERo MI Nimum MAXimum Query the R Zero constant for the user defined RTD type SENSe TEMPerature RTD ALPHa lt value gt MINimum MAXimum Set the alpha constant for the user type SENSe TEMPerature RTD ALPHa MI Nimum MAXimum Query the alpha constant for the user type SENSe TEMPerature RTD BETA lt value gt MINimum MAXimum 146 Set the beta constant for the user type SENSe TEMPerature RTD BETA MI MAXimum Query the beta constant for the user type SENSe TEMPerature RTD DELTa lt value gt
95. g some front panel buttons MENU Offers setting or adjusting function not relating other front panel buttons RANGE A Moves to higher range Moves to lower range AUTO Enables or disables auto range Terminals Selects input signal connections on front or rear panel Inserted Connections amp Fuse Device 4 Chassis Ground Connections Separate environmental noises HI amp LO Used for all measurements except DC and AC current Maximum input voltage 1000V for voltage measurements 200V for 4 wire measurement LO amp Used for making DC and AC current measurements Front Fuse Secures your Meter against damage of strong current pulse Maximum current 3A 250V Chassis Ground Terminal The chassis ground terminal is used for shielding the noise from the nature especially when users want to get a very small signal via the application of a BNC to Banana Adapter Please refer to the Figure 2 16 29 M3500A Digital Multimeter BNC to Banana Adapter Source Chassisg Ground Figure 2 16 2 3 2 The Display M3500A has a 5x7 dot matrix dual display with three color White Red and Yellow annunciators for a better view There are two rows in the dual display screen The upper row displays readings and units A maximum 13 characters are allowed for upper row dot matrix display The lower row displays range of the measurements condition or information about an ongoing configuration A maxim
96. ge with the internal 10M 100 1 divider R204 connected across the input The 500nA ohms current source is connected to produce a nominal 5V signal A 20ms ADC measurement is performed and the result is checked against a limit of 5V t 1V 613 Ohms 5 uA source failed This test configures to the 1000V dc range with the internal 10M 100 1 divider R204 connected across the input The 5 u A ohms current source is connected The compliance limit of the current source is measured A 20ms ADC measurement is performed and the result is checked against a limit of 0 12V 0 01V 614 DC 1000V zero failed This test configures to the 1000V dc range with no input applied A 20ms ADC measurement is performed and the 110 result is checked against a limit of OV 5 mV 615 Ohms 10 uA source failed This test configures to the 1000V dc range with the internal 10M 100 1 divider R204 connected across the input The 104 A ohms current source is connected The compliance limit of the current source is measured A 20ms ADC measurement is performed and the result is checked against a limit of 0 12V 0 01V 616 DC current sense failed This test configures to the 3A dc range A 20ms ADC measurement is performed and the result is checked against a limit of 5 This test confirms that the dc current sense path is functional The test limit is set wide because K303 does not open the current input during self test This test should catch a dc current sense failure w
97. gnal is beyond the allowed range an overflow message OVLD will be displayed Note The rear terminal panel also can be used via the same procedures as the front panel Please refer to Figure 3 3 40 3 5 Continuity Measurements M3500A uses 1 K Q range for the continuity measurement The meter beeps when the test resistance is less than the threshold resistance The default threshold resistance is 1092 but user can set the threshold resistance to anything between 1 Q and 1 K Q The resistance value set by user is stored in a volatile memory and will be cleared after the meter has been turned off The source current for the continuity measurement is 1 mA A Warning The maximum input voltage allowed is 1000 V Applying excess voltage may damage the meter and cause unpredictable hazards How to measure the continuity Selects input signal connections on front or rear panel D Connect the test leads to the terminals as shown in Figure 3 2 2 Set REConnect the input signal as the following figure 3 Set threshold resistance via pressing CONFIG CONT buttons Or skip this step if default resistance is to be used When ready press ENTER button Press CONT button The measured value will be shown on the display automatically Meter beeps when measured resistance value is lower than threshold e value PICOTEST M3500A 9 8888888888888 Q2 Resistance Under Test
98. he front and the rear input terminals press TERMI NALS switch button on the front panel Please see the following figure for the location of the switch The location of the button and terminals is shown with a red rectangle frame in Figure 4 7 Figure 4 7 69 4 2 Trigger Operations In this section we will discuss the triggering system in M3500A M3500A provides a variety of trigger operations for user User can select a trigger mode a trigger source and different trigger settings for a specific measurement The user s selection is stored in a volatile memory and the default settings will be restored after power off Figure 4 8 shows the trigger operation in M3500A Idle Waiting for event Delay Sampling Trigger 1 Samples 1 Sample 1 Trigger 1 Trigger Operation Flow Chart Figure 4 8 4 2 1 Trigger Mode There are three trigger modes in M3500A auto immediate and single triggering User can specify the trigger mode for their measurement The factory default is auto triggering when the meter is power on A Auto Triggering Mode Front Panel Operation only Definition Auto triggering takes continuous readings at a fastest rate possible for the present measurement The rate of taking readings depends on the current settings This function is only available through the front panel The auto triggering is also the default for trigger m
99. hich is sampled 100ms after the current is applied A 20ms A D measurement is performed and checked against a limit of 2V to 13V into the ADC 624 Unable to sense line frequency The supplied voltage AC2 is routed through a comparator U4 to generate a logic input signal This test checks that the logic input from U4 to panel MCU U3 is toggling If no logic input is detected the instrument will assume 50Hz line operation for all future measurements 112 5 Remote I nterface Operations M3500A supports two remote interfaces the built in USB and optional GPIB IEEE 488 With GPIB you will need a GPIB interface card This chapter lists the SCPI Standard Commands for Programmable Instrument commands available to control the multimeter For the first time to use SCPI users would better to refer to Appendix B for SCPI reference 5 1 Pass Fail Output From USB Connector The USB connector on the rear panel of M3500A is a series B connector When the USB interface is disabled I EEE 488 interface is selected the internal pass and fail TTL output signals limit testing will be transmitted via the USB port The pass and fail signals are low true and indicate the Math Pass Fail Limit Test result for the next reading to be output to the GPIB interface The signals are active low for approximately 2ms 100 sec for each reading taken Figure 2 17 shows the USB connector series B ETE ON 2 1 Figure 2 17
100. ht corner of the display screen This doesn t mean the display is POWER OFF but only that the measurement readings will not be sent to the display This option will accelerate the measurement process because there is 1 0 delay But turning off the display will not affect the messages displayed from the RECALL MENU and CONFIG operations User can send a message through the remote interface from their PC terminal to the lower row display and will substitute the original display Default The display default is ON The On Off selection made by user is stored in a volatile memory and the default ON will be restored when the meter is power off 92 How to control the display You can control the display through the front panel operation or through the remote interface operation The remote interface operation has higher priority over the front panel operation Front Panel Operation Use the following steps to control the display Press MENU button then use lt and buttons to locate SYSTEM submenu Press ENTER to select it and then again use 4 and buttons to locate DISPLAY submenu Press ENTER to select it and then find ON or OFF by using lt and gt buttons Press ENTER on your selection The locations of the buttons are shown with red rectangle frames in Figure 4 26 Procedures MENU SYSTEM DISPLAY OFF MENU PREV NEXT ENTER
101. ing the first in first out FIFO order and it records up to 20 errors in the error queue The first error detected will be the first error retrieved Refer to Chapter 6 for the list of error messages 5 The error annunciator will be turned off when you have read the errors in the memory 6 If there is no error found when you check the error queue the multimeter shows NO ERRORS 7 f there are more than 20 errors found the last error in the error queue will be replaced with 350 means too many errors 8 The error queue is cleared when the multimeter is turned off or when a CLS command is received How to check the error queue Press MENU then use lt and to locate SYSTEM submenu Press ENTER to select it Again use 4 and to locate ERROR option Press ENTER to select it The message about error queue will show on the display Refer to Chapter 6 for the descriptions of all the error messages The locations of the buttons are shown with red rectangle frames in Figure 4 35 PREV NEXT ENTER Figure 4 35 4 4 10 Firmware Revision M3500A has three microprocessors for various internal systems You can query the multimeter to determine which revision of firmware is installed 106 for each microprocessor How to check the firmware revision Press MENU and then use lt and to locate SYSTEM submenu Press ENTER to select it Again use 1 and to locate
102. ithout causing false failures when current inputs are applied during self test 617 Ohms 100 uA source failed This test configures to the 1000V dc range with the internal 10M 100 1 divider R204 connected across the input The 100 4 A ohms current source is connected The compliance limit of the current source is measured A 20ms ADC measurement is performed and the result is checked against a limit of 0 12V 0 01V 618 DC high voltage attenuator failed This test configures to the 1000 V dc range The 500nA ohms current source is connected to produce a nominal 5V signal A 20ms ADC measurement is performed and the result is checked against a limit of 5V 1V 619 Ohms 1 mA source failed his test configures to the 1000V dc range with the internal 10M 100 1 divider R204 connected across the input The 1mA ohms current source is connected The compliance limit of the current source is measured A 20ms ADC measurement is performed and the result is checked against a limit of 0 12V 0 01V 620 AC rms zero failed This test configures for the 100mV ac range with the ac input grounded The internal residual noise of the ac section is measured and checked against a limit of LO0mV to 70mV at the output of the rms to dc converter 111 621 AC rms full scale failed This test configures for the 100mV ac range The 1mA ohms current source is switched on to charge the ac input capacitor C614 This produces a pulse on the output of the rms to dc converter w
103. kes the input signal reading as a base value and then internally disconnects the input signal and takes a offset reading a null offset It then subtracts the offset from the base to get an accurate measurement Displayed reading Base value input signal Offset value When the Auto Zero or Auto Gain is enabled the meter takes an offset reading for each subsequent measurement However when Auto Zero or Auto Gain is disabled the meter only takes one offset reading each time when you change the function settings User can set PERIOD to change the time interval for taking an offset reading 51 Defaults The default settings for Auto Zero and Auto Gain are enabled The user selected values for Auto Zero and Auto Gain are stored in a volatile memory and the default settings will be restored when the meter is power off How to set Auto Zero and Auto Gain You can change the Auto Zero and Auto Gain setting through the front panel or through the remote interface operation Front Panel Operation The following steps show how to set Auto Zero and Auto Gain directly through the front panel Be aware that Auto Zero setting is always affected by the resolution setting Whenever the resolution is altered Auto Zero may be changed accordingly The relation between resolution and Auto Zero is shown in Table 4 1 Press MENU and then ENTER on SET ADC If SET ADC is not shown on the display use 4 and gt buttons to locate it Press
104. lect a number for the relative reference or let the multimeter take the first reading 0 dB Front Panel Operation Press CONFIG SHIFT NULL buttons and then use lt and to move through the digits and A and buttons to increase or decrease the numbers to your desired value Press ENTER to set the value The locations of the buttons are shown with red rectangle frames in Figure 4 21 PREV NEXT ENTER Figure 4 21 88 How to make a dB measurement Select the measurement function by pressing one of DCV and ACV buttons Enable the dB operation by pressing SHIFT NULL buttons After enabling the dB operation user can set or alter the dB relative value as mentioned above Observe the displayed reading Figure 4 22 shows the locations of these buttons with red rectangle frames Note Press SHIFT NULL again to disable this feature The MATH anunnciator on the display indicates the state of a mathematical feature Figure 4 22 Remote I nterface Operation Use the following commands from your PC terminal to make the dB measurement CALCulate FUNCtion DB CALCulate STATe OFF ON CALCulate STATe CALCulate DB REFerence lt value gt MINimum MAXimum B dBm Definition With dBm selected a voltage measurement is displayed as the level of power relative to 1 milliwatt dissipated through a refe
105. limit for limit testing You can set the value to any number from 0 to 120 of the highest range for the present function CALCulate LlI Mit LOWer Query the lower limit for the limit testing CALCulate LI Mit UPPer lt value gt MINimum MAXimum Set the upper limit for limit testing You can set the value to any number from 0 to 120 of the highest range for the present function 154 CALCulate LI Mit UPPer Query the upper limit for the limit testing CALCulate MXB MMFactor value Nimum MAXimum Set the value of M CALCulate MXB MMFactor MI Nimum MAXimum Query the value of M CALCulate MXB MBFactor value MI Nimum MAXimum Set the value of B CALCulate MXB MBFactor MI Query the value of CALCulate DB REFerence lt value gt MINimum MAXimum Store a relative value in the dB Relative Register You must turn on the math operation before writing to the math register You can set the relative value to any number between 0 dBm and 200 dBm CALCulate DB REFerence MI Nimum MAXimum Query the dB relative value CALCulate DBM REFerence lt value gt MINimum MAXimum Set the dBm reference value Choose from 50 8000 ohms CALCulate DBM REFerence MI Nimum MAXimium Query the dBm reference value DATA FEED STORE CALCulate Selects whether readings taken using the INI Tiate command are stored in the multimeter s internal
106. load as math reference The multimeter cannot store an overload reading 9 90000000E 37 as the math reference for null or dB measurements The math state is turned off as a result of this condition 550 Command not allowed in local The multimeter received a READ Command while in the local mode Appendix This appendix contains the performance specifications of the M3500A It covers the AC DC Resistance Temperature and Frequency Period 132 characteristics under a variety of conditions It also contains the general characteristics and accuracy calculations for your convenience A lot of efforts are made to make sure these specifications serve your needs for production engineering and or research purposes All specification applies to M3500A unless noted otherwise A Specification List DC Characteristics 1 Accuracy 96 of reading of range 2 Input 1 Year Function Range Resolution Resistance 23 C 5 C 100 0000 mv 0 1 uV gt 10GQ 0 0050 0 0035 1 000000 V 1 0 uV gt 1060 0 0040 0 0007 3 DC Voltage 1000000 V 10 uV gt 1060 0 0035 0 0005 100 0000 V 100 uV 10MQ 0 0045 0 0006 1000 000 V 1 uV 10MQ 0 0045 0 0010 Shunt 1 Year Function Range Resolution Resistance 23 C 5 C DCI 10 000000mA 10 nA 5 10 0 050 0 020 DC 100 00000mA 100 nA 5 10 0 050 0 005 1 Specifications are for 6 digits and two hours warm up 2 20 over
107. long vi signed long stdcall PviWrite usb unsigned long vi unsigned char name unsigned long len unsigned long retval signed long stdcall PviRead usb unsigned long vi unsigned char name unsigned long len unsigned long retval signed long stdcall PviSetAttribute usb unsigned long vi unsigned long viAttr unsigned long attrstat PviOpenDefaultRM usb signed long _ stdcall unsigned long GetProcAddress hUSBTMCLIB LPCSTR viOpenDefaultRM PviFindRsrc_usb signed long __stdcall unsigned long char unsigned long unsigned long char GetProcAddress hUSBTMCLIB LPCSTR viFindRsrc PviClose usb signed long stdcall unsigned long GetProcAddress hUSBTMCLIB LPCSTR viClose PviOpen usb signedlong stdcall unsigned long char unsigned long 182 unsigned long unsigned long GetProcAddress hUSBTMCLIB LPCSTR viOpen PviWrite_usb signed long __ stdcall unsigned long unsigned char unsigned long unsigned long GetProcAddress hUSBTMCLIB LPCSTR viWrite PviRead_usb signed long stdcall unsigned long unsigned char unsigned long unsigned long GetProcAddress hUSBTMCLIB LPCSTR viRead PviSetAttribute usb signed long stdcall unsigned long unsigned long unsigned long GetProcAddress hUS BTMCLI B LPCSTR viSetAttribute if PviOpenDefaultRM usb NULL PviFindRsrc usb NULL PviClose_usb NULL PviOpen
108. measurement related but plays an important role in making your measurements 124 FETCh READ DISPlay OFF ON DISPlay DISPlay TEXT lt quoted string gt TEXT TEXT CLEar SYSTem BEEPer BEEPer STATe 5 SYSTem ERRor SYSTem VERSion DATA POINts SYSTEM IDNSTR MANUFACTURER PRODUCT RST IDN LO L1 STATUS REPORTI NG Commands 125 SYSTem ERRor STATus QUEStionable ENABle enable value QUEStionable ENABle QUEStionable EVENt STATus PRESet CLS ESE enable value ESE ESR OPC OPC PSC 0 1 PSC SRE lt enable value gt SRE STB Other I nterface Commands SYSTem LOCal SYSTem REMote I EEE 488 2 COMMON Commands CLS ESE enable value ESE ESR IDN OPC OPC PSC 0 1 PSC RST 126 SRE lt enable value gt SRE STB TRG 6 Error Messages 127 Errors are retrieved in first in first out FIFO order The first error returned is the first error that was stored When user has read all errors from the queue the ERROR annunciator turns off M3500A beeps once each time an error occurs Should more than 20 errors have existed the last error stored in the queue the most recent error is replaced with 350 Too many errors No additional errors are saved until you remove errors from the queue the multimeter responds with 0 No error The error queue is clear
109. memory default not stored at all In the default state DATA FEED RDG STORE CALC up to 2000 readings are stored in memory when INITiate is executed The MEASure And CONFigure commands automatically select CALC With memory disabled DATA FEED RDG_STORE readings taken using INITiate are not stored This may be useful with the Min Max operation since it allows you to determine an average of 155 the readings without storing the individual values An error will be generated if you attempt to transfer readings to the output buffer using the FETCh command DATA FEED Query the reading memory state Return CALC or C 7 The Triggering Commands I NI Tiate Change the state of the triggering system from the idle state to wait for trigger state The meter will start to make measurements when a required triggering condition is met after the INI Tiate command is received Readings are stored in memory until you are ready to read them Use FETCh command to retrieve your measurements results READ Change the state of the triggering system from the idle state to wait for trigger state The meter will start to make measurements when a required triggering condition is met after the READ Command is received Readings are sent to the output buffer right away TRI Gger SOURce BUS MMediate EXTernal Select a trigger source The multimeter will accept a software BUS trigger an immediate i
110. nd configure the multimeter for DC voltage measurements with the specified range and resolution This command does not initiate the measurement CONFigure VOLTage DCRATIOo lt range gt MI N MAX DEF lt resolution gt MI N MAX DEF Preset and configure the multimeter for DC DC ratio measurements with the specified range and resolution This command does not initiate the measurement The specified range applies to the source signal and autorange is selected for the reference signal CONFigure VOLTage AC range MI N MAX DEF resolution MI N MAX DEF 144 Preset and configure the multimeter for AC voltage measurements with the specified range and resolution This command does not initiate the measurement For AC measurement resolution is fixed at 6 digits Therefore the resolution parameter only affects the front panel display CONFigure CURRent DC lt range gt N MAX DEF lt resolution gt MAX DEF Preset and configure the multimeter for DC current measurements with the specified range and resolution This command does not initiate the measurement CONFigure CURRent AC lt range gt N MAX DEF lt resolution gt MI N MAX DEF Preset and configure the multimeter for AC current measurements with the specified range and resolution This command does not initiate the measurement For AC measurement resolution is fixed at digits Therefore the resolution parameter o
111. nes several different data formats to be used in program messages and response messages Numeric Parameters Commands that require numeric parameters will accept all commonly used decimal representations of numbers including optional signs decimal points and scientific notation Special values for numeric parameters like MINimum MAXimum and DEFault are also accepted You can also send engineering unit suffixes with numeric parameters e g M K or u If only specific numeric values are accepted the multimeter will automatically round the input numeric parameters The following command uses a numeric parameter VOLTage DC RANGe lt range gt MI Nimum Discrete Parameters Discrete parameters are used to program settings that have a limited number of values like BUS IMMediate EXTernal They have a short form and a long form just like command keywords You can mix upper and lower case letters Query responses will always return the short form in all upper case letters The following command uses discrete parameters TRI Gger SOURce BUS MMediate EXTernal Boolean Parameters Boolean parameters represent a single binary condition that is either true or false For a false condition the multimeter will accept OFF or O For a true condition the multimeter will accept ON or 1 When you query a boolean setting the instrument will always return O or 1 The following command uses a boolean parameter 1
112. ng MEASure for a Single Measurement The following example uses the MEASure command to make a single ac current measurement This is the easiest way to program the multimeter for measurements However MEASure does not offer much flexibility The example is shown in Visual Basic Creating the Application Create a new Visual Basic project as follows 1 Create a new Standar EXE project 2 To set the startup object for a Windows Application to Sub Main 3 Add New Module and declare a Sub Main 173 How to Change the Startup Object for an Application The Startup Object property for a project defines the entry point to be called when the application loads generally this is set to either the main form in your application or to the Sub Main procedure that should run when the application starts Since Class Libraries do not have an entry point their only option for this property is None For Windows Applications projects only forms or classes with a Public Sub Main procedure are available as Startup objects unless you check the Startup with custom Sub Main checkbox when this option is checked you must add code in the Sub Main procedure for the form X Note When using a custom Sub Main procedure as the Startup object code in the Application events Startup Shutdown Startup Next Instance and Unhandled Exception is not executed The Startup Object property can be set in the Application pane of the Project Designer To change
113. nge the numbers to a desired value Press ENTER to set the value Choosing SPRTD takes you to a menu where you can specify the seven coefficients that are used to determine the temperature Use 4 and gt to move through the digits and and to change the numbers to a desired value Press ENTER to set the value Remote I nterface Operation Use the following commands to set up the RTD configuration 66 SENSe TEMPerature RTD TYPE PT100 D100 F100 PT385 PT3916 USER SPRTD SENSe UNIT Cel Far K SENSe UNI T SENSe TEMPerature RTD RZERo lt value gt MI Nimum SENSe TEMPerature RTD ALPHa value Nimum SENSe TEMPerature RTD BETA lt value gt MI Nimum SENSe TEMPerature RTD DELTa lt value gt MI Nimum SENSe TEMPerature SPRTD RZERo lt value gt MINimum MAXimum SENSe TEMPerature SPRTD A4 value MI Nimum MAXimum SENSe TEMPerature SPRTD B4 value Nimum SENSe TEMPerature SPRTD AX 1 value MI SENSe TEMPerature SPRTD BX value MI Nimum SENSe TEMPerature SPRTD CX value MI Nimum MAXimum SENSe TEMPerature SPRTD DX value Nimum MAXimum Thermocouple Definition If users are using the thermocouple function the selections on the M3500A are type E J K N R S and T On the other hand other selection SI MULATED simulates the
114. nly affects the front panel display CONFigure RESistance range MI N MAX DEF lt resolution gt MI N MAX DEF Preset and configure the multimeter for 2 wire measurements with the specified range and resolution This command does not initiate the measurement CONFigure FRESistance range MI N MAX DEF resolution MI N MAX DEF Preset and configure the multimeter for 4 wire Q measurements with the specified range and resolution This command does not initiate the measurement CONFigure FREQuency range MI N MAX DEF resolution MI N MAX DEF Preset and configure the multimeter for frequency measurements with the specified range and resolution This command does not initiate the measurement For frequency measurements the meter uses only one range for all inputs between 3Hz and 300kHz With no input signal applied frequency measurements return 0 CONFigure PERiod range MI N MAX DEF resolution MI N MAX DEF Preset and configure a period measurement with the specified range and resolution This command does not initiate the measurement For period measurements the meter uses only one range for all inputs between 0 33 145 seconds and 3 3 usec With no input signal applied period measurements return 0 CONFigure CONTinuity Preset and configure for a continuity measurement This command does not initiate the measurement The range and resolution ar
115. nternal trigger or a hardware trigger from the rear panel EXT TRIG terminal TRI Gger SOURce Query the trigger source TRI Gger DELay lt seconds gt MI Nimum Set a trigger delay time in seconds The delay is the time between the trigger signal and each sample that follows Specify a delay time from 0 to 3600 seconds TRI Gger DELay 156 Query the trigger delay time TRI Gger DELay AUTO OFF ON Disable or enable a automatic trigger delay The delay is determined by function range integration time and ac filter setting Specifying a delay time automatically turns off the automatic trigger delay TRI Gger DELay AUTO Query the automatic trigger delay mode Returns 0 OFF or 1 ON SAMPIe COUNt lt value gt MI Nimum Set the number of readings samples the multimeter takes per trigger Select a number from 1 to 50 000 readings per trigger SAMPIe COUNt MI Nimum MAXimum Query the sample count TRI Gger COUNt value MI Nimum MAXimum I NFinite Specify the number of triggers the multimeter will accept before returning to the idle state Select from 1 to 50 000 triggers The INFinite parameter instructs the multimeter to take triggers continuously Trigger count is ignored while in local operation TRI Gger COUNt MI Nimum I NFinite Query the trigger count Returns 9 90000000 37 when you select the infinite trigge
116. ode in M3500A How to use Auto Trigger Press ATUO TRIGGER on the front panel to toggle for enabling auto trigger mode The location of the button is shown with a red rectangle frame on Figure 4 9 70 Figure 4 9 B Internal Immediate Trigger Mode Remote I nterface Operation Only Definition The immediate triggering mode is only available through the remote interface operations and it is the default for the remote interface operations When the meter is in immediate trigger mode a trigger will be issued immediately as soon as the meter is in wait for event state How to use Immediate Trigger Use the following command in your PC terminal to set the internal immediate trigger TRI Gger SOURce I MMediate C Single Trigger Mode accessible only through the front panel Definition Single trigger mode takes one reading or specified number of readings each time when user presses SINGLE key Please refer to 4 2 3 for setting the number of samples on each trigger When the TRIG annunciator on the display is lit the meter is ready for next trigger event The single trigger mode is only available through the front panel operations 71 How to use Single Trigger First select the measurement function and then press SINGLE key on the front panel to set the trigger mode The location of the button is shown with a red rectangle frame in Figure 4 10
117. or resistance Thermocouple temperature amp RTD measurements Some additional capabilities of M3500A include Full math functions dB dBm MX B ratio Max Min null amp limits Optional multipoint scanner card For internal scanning options include M3500 opt01 10 channel general purpose USB and GPIB Optional remote control interface Through Microsoft Office Word amp Excel for remotely storing and recalling the measured values Through M3500 AP software for simulating the real operation on PC 1 2 Warranty Information If the equipment is used a manner not specified by the manufacturer the protection provided by the equipment may be impaired 1 Warranty PICOTEST CORP guarantees that this product meets its published specifications at the time of shipment from the factory Under proper installation it should work as expected Warranty Period This equipment is warranted against defects in material and manufacturing for a period of one year from the date of shipment During the warranty period PI COTEST is responsible for necessary repairs as long as the product can be proved to be defective For warranty service or repair this product must be returned to a service facility designated by PICOTEST Please contact your local service representative Excluded Items This warranty does not include consumptive parts such as fuses buttons and relays Neither does this warranty cover d
118. ore connection information When you use 4 wired resistance measurement with scanner card please note that the channel 1 is relative to the channel 6 channel 2 to channel 7 and SO on Note Setting range of scanner card is only limited DCV DCI ACV ACI Frequency Period and Resistance functions As to the current measurements users can install current shunts on the circuit board R1 and R2 to allow indirect AC and DC current measurements to be made through channels 1 and 6 only Remark 1 In the default situation current shunts are not installed in the scanner card Remark 2 When the current shunts are installed the channel 1 and channel 6 will be limited to the current measurement unless users release the shunts of the R1 and R2 99 Note The Information regarding the Limitation of Input Signals in Scanner Card is in the following statement 10 Channels 10 channels of 2 pole relay input All channels configurable to 4 pole CAPABILITIES Multiplex one of ten 2 pole or one of five 4 pole signals into DMM INPUTS Maximum Signal Level DC Signals 110V DC 1A switched 30VA maximum resistive load AC Signals 125V AC rms or 175V AC peak 100kHz maximum 1A switched 62 5VA maximum resistive load Contact Life 2100000 operations at maximum signal level 2100000000 operations cold switching Contact Resistance lt lohm at end of contact life Actuation Time 5ms maximum on off Contact Potential lt 500nV typic
119. ote Press SHIFT RATIO again to disable this feature The MATH anunnciator on the display indicates the state of a mathematical feature 85 Figure 4 19 Remote Interface Operation Use the following commands to enable the limits function or to set the limits CALCulate FUNCtion LI Mit CALCulate STATe OFF ON CALCulate STATe CALCulate LI Mit LOWer lt value gt MINimum MAXimum CALCulate LI Mit UPPer lt value gt MINimum MAXimum 4 3 6 MX B Definition This mathematical function multiplies a measurement reading X by a specified scale factor M and add an offset B automatically The answer Y will then be shown on the display according to the following equation Y MX B This is especially useful when user needs to do slope calculations on a series of measurements The values of the and can be changed through the configuration of this function and they are stored in a volatile memory and will be cleared after the meter has been turned off or a remote interface reset User can either use front panel or remote interface to perform this 86 function and set these two constant How to use function You can use MX B function from the front panel operation or the remote interface operation Front Panel Operation To set the values of M and B user needs to configure this math function by pressing CONFIG and SHIFT 96 Use lt and to
120. ow the procedure below to disable or enable the beeper Press MENU button then use lt and buttons to find SYSTEM menu Press ENTER to choose it and then again use 1 and gt buttons to find BEEP menu Press ENTER to choose it and then find ON or OFF by using lt and buttons Press ENTER on your selection The locations of the buttons are shown with red rectangle frames in Figure 4 27 94 Procedures MENU SYSTEM BEEP ON OFF MENU PREV NEXT ENTER Figure 4 27 Remote I nterface Operation The following commands show how to use the remote interface operation to disable or enable the beeper SYSTem BEEPer SYSTem BEEPer STATe OFF 4 4 3 Reading Memory Store amp Recall M3500A has a memory capacity of 2000 readings The readings are stored in first in first out order and the memory type is volatile which means the stored readings will be cleared when the multimeter is power off The reading memory feature can be used for all measurement functions math operations trigger operations and reading hold How to use the reading memory User can store the readings and access to the stored readings through either the front panel operation or the remote interface operation Note Each datum stored from M3500A to remote interface will be in a first in and first out condition 95 Front Panel Operation Before using the reading memory feature user
121. parameter 138 Suffix not allowed A suffix was received following a numeric parameter which does not accept a suffix 148 Character not allowed A discrete parameter was received but a character string or a numeric parameter was expected 129 e 151 Invalid string data An invalid character string was received 158 String data not allowed A character string was received but not allowed for the command 160 168 Block data errors Block data is not acceptable 170 178 Expression errors The meter does not accept mathematical expression 211 Trigger ignored A Group Execute Trigger GET or TRG was received but the trigger was ignored e 213 Trigger deadlock A trigger deadlock occurs when the trigger source is BUS and a READ Command is received e 214 Init Ignored An INI Tiate command was received but could not be executed because measurement was already in progress Send a device clear to halt a measurement in progress and place the meter in the idle state e 221 Settings conflict This error can be generated in one of the following situations Situation 1 You sent a CONFigure or MEASure command with autorange enabled and with a fixed resolution Situation 2 You turned math on and then changed to a math operation that was not valid with the present measurement function e 222 Data out of range A numeric parameter value is out of range e 223 Too much data 130 A character st
122. pment has been strictly tested for quality before delivery from our factory However this equipment must not be used in dangerous situations where damage may result This product should be placed in a safe area in case of unpredictable personnel use The rear protective conduct terminal needs to be connected to the actual earth ground or electric shock may occur The patent and related documents for the equipment belong to PICOTEST CORP and they aren t allowed to be used by others without permission 1 4 Upkeep of M3500A Although M3500A multimeter is very durable and weather resistant care should be taken not to expose it to severe impact or pressure Keep M3500A far from water and damp environment Calibration will be taken every year Please contact with your local service representative for more information e f the incorrect display or abnormal beeps occurred you should stop using the equipment at once Do not use the Meter around explosive gas or inflammable vapor Wipe the surface of M3500A multimeter with a piece of dry and clean cloth 1 5 Safety Information A Caution Please read through the following safety information before using the product To avoid possible electric shock or personal injury please read and follow these guidelines carefully Follow the guidelines in this manual and DO NOT use the Meter if the case is damaged Check the Meter case and terminals and make sure all the d
123. r AC measurements only It also affects the speed of the multimeter to yield a measurement reading Digital filter further stabilizes the measurement readings by averaging Both of them are described in detail in the subsequent sections respectively 4 1 2 1 AC Filter Definition User is allowed to set the bandwidth for selecting one of the three AC filters Slow Medium and Fast in order to achieve either higher accuracy in low frequency measurements or faster AC settling time Defaults The factory default is 20 Hz Medium Users can select their filter type as they wish when setting bandwidth value The selection is stored in a volatile memory and the default setting will be restored when the meter is power off Table 4 2 Time Bandwidth AC Filter seconds per reading 3 Hz 300 KHz Slow 7 20 Hz 300 KHz Medium 1 200 Hz 300 KHz Fast 0 1 How to set AC Filter in AC measurements User can set the AC Filter either through the front panel operation or through the remote interface operation 54 Front Panel Operation Press CONFIG ACV button Use 4 and gt buttons to locate BAND WIDTH submenu and then press ENTER to Select it Look for the desired bandwidth using lt and gt buttons Then press ENTER on your selection There are three options 3Hz 20Hz and 200Hz The locations of these buttons are shown with red rectangle frames in Figure 4 2 PREV NEXT
124. r count C 8 The System Related Commands FETCh Transfer readings stored in memory by the INI Tiate command to output buffer where you are able to read them into your bus controller READ Change the state of the triggering system from the idle state to wait for trigger state The meter will start to make measurements when a required triggering condition is met after the READ command is received 157 Measurement readings are sent to the output buffer immediately DISPlay OFF ON Turn off or on the display DI SPlay Query the display setting Returns 0 OFF or 1 ON DISPlay TEXT quoted string Show a message on the front panel display The allowed message can be up to 16 characters in the lower row display any additional characters will be truncated DI SPlay TEXT Query the message sent to the front panel display DI SPlay TEXT CLEar Clear the message shown on the front panel display SYSTem BEEPer Issue a single beeping tone SYSTem BEEPer STATe OFF ON Disable or enable the beeper SYSTem BEEPer STATe Query the beeper mode Returns 0 OFF or 1 ON SYSTem ERRor Query the multimeter s error queue Up to 20 errors can be stored in the queue Errors are retrieved in first in first out FIFO order Each error string may contain up to 80 characters SYSTem VERSion Query the present SCPI version LO 156 Set to the default identification string
125. ration Front Panel Operation First choose a measurement function on the front panel then press AUTO button to select auto range feature Or use and V buttons to manually select a range If selected range is not shown on the bottom of the display press round PREV or NEXT buttons until the range information appears The locations of these buttons are shown with a red rectangle frame in Figure 4 6 AUTO v Cs EE EO wet mmm CR uum Figure 4 6 62 Remote Interface Operation Use the following commands from your PC terminal to set the range CONFigure function lt range gt lt resolution gt MEASure lt function gt lt range gt lt resolution gt SENSe lt function gt RANGe lt range gt SENSe lt function gt RANGe AUTO OFF ON 4 1 7 Rate Integration Time Definition Integration time is the period of time the analog to digital A D converter takes to sample the input signal The integration time feature allows user to optimize either the speed or the resolution as well as the noise rejection and the accuracy of the measurement The unit of the integration time is in PLC power line cycles One PLC for 60 Hz is 16 67 ms and for 50 Hz is 20 ms There are 4 different integration times in M3500A for user to select from 0 02 0 1 1 and 10 PLCs Default For DCV DCI and resistance measurement th
126. reference junction To use the the thermocouple function users have to adjust something First of all via a thermocouple adaptor users need to measure a known and accurate reference temperature 1 as a criterion Then the display of the M3500A will show a reference value T2 At the moment a remainder T3 from T1 T2 will be calculated After that users just adjust the default simulated value 23 0 C to 23 0 C T3 Under the circumstance the thermocouple function will be activated completely For Example If the criterion value is T1 30 0 C the reference value showing on the M3500A is T2 24 0 C Users will get a remainder T3 T1 T2 6 0 C Then users just configure the default simulated value from 23 0 C to 29 0 C on the M3500A 67 How to set up thermocouple You can set up the thermocouple configuration either through the front panel operation or through the remote interface operation Front Panel Operation 1 Configure the thermocouple type and unit Pressing CONFIG gt SHIFT gt TEMP TCOUPL and then using PREV and NEXT to select the type and unit 2 Measure a known and accurate reference temperature T1 The result showing on the M3500A is T2 3 Adjust the simulated value 23 0 C to 23 0 C T3 4 Configure the Simulated value by pressing CONFIG gt SHIFT gt TEMP TCOUPL gt NEXT gt SIMULATED gt ENTER and by buttons PREV or NEXT and A amp assistance to adjust the valu
127. rence resistance The reference resistance is adjustable in M3500A The calculation of dBm 89 is defined as below dB 10x1og ref X Note is the input signal voltage Z is the reference resistance ref Note Change of reference resistance will not affect the stored relative reference value The Zref is adjustable with a range from 500 to 8000 The default value is 600 Q The user selected reference value is stored in a volatile memory and will be cleared after the multimeter has been power off This feature is available for DCV and ACV only How to set the reference resistance User can set the reference resistance either through the front panel operation or the remote interface operation Front Panel Operation Press CONFIG SHIFT MIN MAX then use 4 and gt to move through the digits and and to increase or decrease the numbers to a desired value Press ENTER to set the value The locations of the buttons are shown with red rectangle frames in Figure 4 23 SHEL MIN MAX PREV NEXT ENTER Figure 4 23 90 How to make adBm measurement Select a measurement function by pressing DCV or ACV button The dBm feature is only available for DCV and ACV only To enable dBm press SHIFT MIN MAX buttons After enabling the dBm operation user can select the reference resistance as mentioned above The default
128. ring was too long 224 Illegal parameter value A discrete parameter was received which was not a valid choice for the command 230 Data Stale A FETCh Command was received but the memory was empty 350 Too many errors The error queue is full 410 Query INTERRUPTED A command was received which sends data to the output buffer but the output buffer contained data from a previous command 420 Query UNTERMI NATED The multimeter was addressed to talk i e to send data over the interface but a command has not been received which send data to the output buffer 430 Query DEADLOCKED A command was received which generates too much data to fit in the output buffer and input buffer is also full Command execution continues but all data is lost 440 Query UNTERMI NATED after indefinite response The IDN Command must be the last query command within a command string e 521 Input buffer overflow 522 Output buffer overflow 531 Insufficient memory There is not enough memory to store the requested number of readings in internal memory using the INITiate command The product of the sample count SAMPle COUNt and the trigger count TRIGger COUNt 131 must not exceed 512 readings 532 Cannot achieve requested resolution The multimeter cannot achieve the requested measurement resolution You may have specified an invalid resolution in the CONFigure or MEASure command 540 Cannot use over
129. rning Erroneous self test failures may occur if the setting of power line voltage is incorrect Errors may also occur because of signals present on the input terminal front and rear during self test procedure Long test leads can act as an antenna causing pick up of ac signals How to execute Self test Users may execute a complete self test by front panel operation This test procedure provides more tests for the hardware of M3500A than the power on tests Please follow the Figure 4 38 direction and procedure below to perform the complete self test 108 MENU PREV NEXT ENTER es m II ss lt Figure 4 38 Procedure MENU SYSTEM SELF TEST After self test procedure the result PASS or FAIL will be shown If the result is FAIL the ERR annunciator on the display panel will be lit and error codes will be stored You can check the error codes by the following procedure Procedure MENU 5 SYSTEM S ERROR The descriptions of self test procedures are listed below including test number purpose test setup and failure criteria 601 Front panel does not respond The main CPU U1601 attempts to establish serial communications with the front panel processor U3 Communication must function in both directions for this test to pass 602 RAM read write failed This test writes and reads a 55h and AAh checker board pattern to each address of r
130. rth ground This symbol indicates Protective Conductor Terminal 10 This symbol indicates earth ground terminal This symbol indicates this product complies with the essential requirements or the applicable European laws or directives with respect to safety health environment and consumer protections A Note Full M3500A specifications are included in Appendix A 1 7 Inspection Your product package is supplied with the following items One M3500A Multimeter unit 224mm x 113mm x 373mm approx 4 3 Kg One power line cord One USB cable Standard Test Leads One CD including this electronic User s Manual and software applications Optional accessories as you ordered Multi Point scanner card Optional GPIB interface card Optional 1 The M3500A is provided with a Standard Test lead set described below Test Lead Ratings EC 61010 031 CAT III Operating Voltage 1000V DC Current 10 Ampers UL CE Rated Material Probe Body Outer Insulation Santoprene Rubber 11 Banana Plug Body Brass Nickel Plated Spring Beryllium Copper Nickel Plated Insulation Polypropylene Resin Flasme Retardant Grade 2038 Others If any part of the Test Lead Set is damaged please do not use and replace with a new set Warning If users use the Test Lead Set without following the specification of Picotest Corp the protection of the Test Lead Set could be impaired In addition pl
131. s for a specific measurement Refer to Figure 4 8 for triggering system flow chart Triggering from a remote interface is a multi step sequence You must first configure the mulitmeter by choosing the desired function range and resolution Specify the trigger source from which the multimeter will accept the trigger The multimeter takes immediate internal trigger a software trigger from a remote interface and external 123 trigger from the rear panel Then be sure that the multimeter is ready for a trigger in the wait for trigger state The multimeter accepts a trigger only when it is in the wait for trigger state When you have finished configuring the multimeter and have selected a trigger source you need to place the multimeter in the wait for trigger state so it will take the trigger and make the measurement The INITiate READ and MEASure commands all place the multimeter to the wait for trigger state Triggering Commands INITiate READ TRI Gger SOURce BUS I MMediate EXTernal 500 TRI Gger DELay lt gt DELay MI Nimum MAXimum TRI Gger DELay AUTO OFF ON DELay AUTO SAMPlIe COUNt lt gt MINimum MAXimum COUNt MINmum MAXimum 1 TRI Gger COUNt lt value gt MI Nimum MAXimum INFinite COUNt MINmum MAXimum SYSTEM RELATED Commands Each system related operation performs a task that is not
132. s to increase or decrease the numbers to a desired target value Press ENTER to set the value Press to activate this function And then observe the calculated percent value on the display as shown as Figure 4 15 x Note Press again to disable this function The MATH annunciator on the display indicates the state of a mathematical feature Figure 4 15 Remote I nterface Operation Use the following commands to enable and configure Percent function CALCulate FUNCtion PERCent CALCulate STATe OFF ON CALCulate STATe CALCulate PERCent TARGet value Nimum MAXimum CALCulate PERCent TARGet MI Nimum MAXimum 4 3 3 Min Max Definition When the Min Max function is enabled the multimeter takes in a series of readings from the measurements stores the minimum and maximum readings in the memory and then calculates the average value of all readings The number of readings taken since Min Max operation is enabled is recorded as well These data are stored in a volatile memory 81 and will be cleared when the meter is turned off or when the MIN MAX is turned on or after a remote interface reset The meter beeps every time when it captures a new minimum or maximum How to use Min Max You can use the Min Max feature either through the front panel operation or the remote interface operation Front Panel Operation User first selects the measurement function they
133. switch between M and B Press ENTER on your selection Then use and gt to move through the digits and use A and V to increase or decrease the number to a desired value Press ENTER to set the value User needs to set the values of M and B first Then Select a measurement function and press SHIFT 96 to activate MX B function as shown as Figure 4 20 CONFIG PREV NEXT ENTER Figure 4 20 Remote I nterface Operation Use the following commands to enable and configure MX B function CALCulate FUNCtion MXB CALCulate STATe OFF ON CALCulate STATe CALCulate MXB MMFactor value Nimum MAXimum CALCulate MXB MMFactor MI Nimum MAXimum CALCulate MXB MBFactor value Nimum MAXimum CALCulate MXB MBFactor MI Nimum MAXimum 87 4 3 7 dB dBm A dB Definition The dB feature takes a DC or AC voltage measurement and displays it in decibel unit in correspondence to a relative reference value The calculation of dB is listed below dB 20x log p or dB Input signal in dBm relative value in dBm NOTE The V is the input signal and the is the relative reference The dB measurement is applied to DC and AC voltage only The relative value is adjustable and is stored in a volatile memory The range for the relative value is between 0 dBm and 200 dBm How to set the relative value User can either manually se
134. t VI SUCCESS Then MsgBox Open device failed vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If Rem send reset command RST reset M3500 stat viWrite sesn RST 4 ret If stat lt VI_SUCCESS Then MsgBox System command error RST vbExclamation M3500 multimeter device test 175 stat viClose fList Exit Sub End If Rem send Clear command CLS Clear M3500 status register stat viWrite sesn CLS 4 ret If stat lt VI_SUCCESS Then MsgBox System command error CLS vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If Rem send measure command Set to 0 1 volt dc range stat viWrite sesn meas volt DC 0 1 0 01 22 ret If stat lt VI_SUCCESS Then MsgBox System command error meas volt dc vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If Rem fetch the measure data stat viRead sesn readin 64 ret If stat VI SUCCESS Then MsgBox Read in data error vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If Debug Print Rdg readin Rem set to local mode stat viWrite sesn system local 12 ret If stat lt VI_SUCCESS Then MsgBox System command error system local vbExclamation M3500 multimeter device test 176 stat viClose fList Exit Sub End If stat viClose sesn stat viClose
135. t and gt buttons to locate INPUT R option Press ENTER to select it Then select desired value for the input resistance by pressing lt 1 or gt button Press ENTER to choose it Two values are available 10M or gt 10G The locations of these buttons are shown with red rectangle frames in Figure 4 4 CONFIG ENTER RE PREV NEXT Figure 4 4 Remote I nterface Operation The automatic input resistance mode can be enabled disabled With AUTO OFF default the input resistance is fixed at 10 for all ranges With AUTO ON the input resistance is set to gt 10GQ for the three lowest DC voltage ranges 100mV 1V and 10V Use the following command from your PC terminal to disable the auto input DC resistance setting the result is a fixed input DC resistance at 10M Q for all measurements I NPut I MPedance AUTO OFF 60 4 1 5 Threshold Resistance Continuity Definition When testing continuity the beeper goes off when the measured resistance is less than the threshold resistance The threshold resistance can be set to any value between 12 and 10002 Default The factory default for continuity threshold resistance is 100 User s selection is stored in a volatile memory and the default value will be restored after the meter has been turned off How to set the threshold resistance User can change the threshold resistance only through the front panel Pr
136. t row of your meter s front panel Press DIGITS button to select your desired resolution for your measurement User can press DIGITS button several times to see how the resolution setting changes from 4 5 5 5 to 6 5 Note When using Method A to set the resolution your options are 4 5 slow 5 5 slow and 6 5 fast Press CONFIG and then select a function as you wish from DCV SHIFT DCV 02 94 SHIFT 02 FREQ and PERIOD SHIFT FREQ Press ENTER on RESOLUTION submenu If it is not shown on the display use 4 and to locate it Use 4 and to find your desired resolution Press ENTER on your choice Note The resolution of AC measurements is fixed at 6 5 digit Note The options for frequency and period measurements are 4 5 slow 5 5 slow and 6 5 slow CONFIG DIGITS t F 2 7 Y BS ceti setur GE f o FP CIC WC f Ot ep f D AV cart 000v or ENTER RG PREV NEXT Figure 4 3 58 Remote Interface Operation Use the following commands on your PC terminal to set the resolution for your measurement CONFigure function lt range gt lt resolution gt MEASure lt function gt lt range gt lt resolution gt SENSe lt function gt RESolution lt resolution gt Users can sp
137. ter after the command is executed Returns 1 to the output buffer after the command is executed PSC 0 1 Power on status clear Clear the Status Byte and Standard Event register enable masks when power is turned on PSC 1 When PSC 0 is in effect the Status Byte and Standard Event register enable masks are not cleared when power is turned on Stored in non volatile memory PSC Query the power on status clear setting Returns 0 PSC 0 or 1 PSC 1 SRE enable value Enable bits in the Status Byte enable register SRE Query the Status Byte enable register The multimeter returns a decimal value which corresponds to the binary weighted sum of all bits set in the register 168 STB Query the Status Byte summary register The STB command is similar to a serial poll but it is processed like any other instrument command The STB command returns the same result as a serial poll but the request service bit bit 6 is not cleared if a serial poll has occurred C 11 SCPI Compliance I nformation This section encloses a list of commands that are device specific to the M3500A Although not included in the 1999 0 version of the SCPI standard these commands are compliant to the SCPI format and they follow the syntax rules of the standard Many of the required SCPI commands are accepted by the multimeter but aren t described in this manual for simplicity or clarity Most of
138. test Exit Sub End If Rem Find all M3500 USBTMC instruments in the system stat viFindRsrc dfltRM USB 0 9 0x05E6 0xM3500 INSTR fList nList desc If stat VI SUCCESS Then Rem Error finding resources exiting MsgBox M3500 device not found vbExclamation M3500 multimeter device test viClose dfltRM Exit Sub End If Rem Open a session to each and determine if it matches stat viOpen dfltRM desc NULL NULL sesn If stat VI SUCCESS Then MsgBox Open device failed vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If Rem send reset command RST reset M3500 stat viWrite sesn RST 4 ret If stat VI SUCCESS Then MsgBox System command error RST vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If Rem send Clear command CLS Clear M3500 status register stat viWrite sesn CLS 4 ret If stat VI SUCCESS Then MsgBox System command error CLS vbExclamation M3500 multimeter device test stat viClose fList Exit Sub End If Rem send command 50 ohm reference resistance stat viWrite sesn CALC DBM REF 50 15 ret If stat VI SUCCESS Then MsgBox System command vbExclamation M3500 multimeter device test stat viClose fList 176 Exit Sub End If Rem send command Set kM3500 to 1 amp ac range stat viWrite sesn CONF 1 0 001 2
139. the scanner card was inserted 0 means it hasn t been inserted yet ROUTe SCAN FUNCtion channel function VOLT DC VOLT AC FREQuency RESistance FRESistance NONE Set scanner card s measurement functions which might be for the VAC VDC Frequency 2 Wire Resistance 4 Wire Resistance or disabling the channel ROUTe SCAN FUNC channel Query the channel s function on the scanner card ROUTe SCAN TI MER Read the time interval of scanning ROUTe SCAN TI MER value Set the time interval of scanning The unit is second ROUTe SCAN COUNT Read the number of times of scanning ROUTe SCAN COUNT value 152 Set the number of times of scanning ROUTe SCAN STATe Query a channel numeric which is being scanned ROUTe SCAN SCAN Run SCAN mode ROUTe SCAN STEP Run STEP mode C 6 The Math Operation Command CALCulate FUNCtion PERCent AVERage NULL LI Mit MXB DB DBM Select the math function Only one function can be enabled at a time The default function is percent CALCulate FUNCtion Query the present math function Returns PERC AVER NULL LIM MXB DB or DBM CALCulate STATe OFF ON Disable or enable the selected math function CALCulate STATe Query the state of the math function Returns O OFF or 1 ON CALCulate PERCent TARGet value Nimum MAXimum Set the target value for percent math function The multimeter clears th
140. the startup object 1 With a project selected in Solution Explorer on the Project menu click Properties 2 Select the Application pane 3 Select a Startup object from the Startup object drop down list To set the startup object for a Windows Application to Sub Main 1 With a project selected in Solution Explorer on the Project menu click Properties 2 Select the Application pane 3 Check the Startup with custom Sub Main checkbox 4 Select Sub Main from the Startup object drop down list LI STI NG C 1 MEASure bas THE Sub Main FUNCTION IS WHERE YOU NEED TO ADD INITIALIZATION CODE Sub Main Dim stat As ViStatus Dim dfltRM As ViSession Dim sesn As ViSession Dim fList As ViFindList 174 Dim desc As String VI_FIND_BUFLEN Dim nList As Long Dim ret As Long Dim readin As String 64 stat viOpenDefaultRM dfltRM If stat VI SUCCESS Then Rem Error initializing VISA exiting MsgBox USBTMC resource not found vbExclamation M3500 multimeter device test Exit Sub End If Rem Find all M3500 USBTMC instruments in the system stat viFindRsrc dfltRM USB O0 9 0x05E6 0xM3500 INSTR fList nList desc If stat VI SUCCESS Then Rem Error finding resources exiting MsgBox M3500 device not found vbExclamation M3500 multimeter device test viClose dfltRM Exit Sub End If Rem Open a session to each and determine if it matches stat viOpen dfltRM desc VI NULL VI NULL sesn If sta
141. these non documented commands duplicate the functionality of a command already described in this chapter MEASure CONTinuity DIODe SAMPlIe COUNt value MINimum MAXimum COUNt MI Nimum MAXimum SENSe FUNCtion CONTinuity FUNCtion DI ODe FREQuency VOLTage RANGe lt range gt MINimum MAXimum FREQuency VOLTage RANGe MINimum MAXimum FREQuency VOLTage RANGe AUTO OFF ONJ FREQuency VOLTage RANGe AUTO PERiod VOLTage RANGe range MINimum MAXimum PERiod VOLTage RANGe MI Nimum MAXimum 169 PERiod VOLTage RANGe AUTO OFF ON PERiod VOLTage RANGe AUTO ZERO AUTO CALCulate PERCent TARGet lt value gt MINimum MAXimum PERCent TARGet MINimum MAXimum AVERage MI Nimum AVERage MAXimum AVERage AVERage AVERage COUNT NULL OFFSet value MINimum MAXimum NULL OFFSet MINimum MAXimum LI Mit LOWer lt value gt MINimum MAXimum LI Mit LOWer MINimum MAXimum LI Mit UPPer lt value gt MINimum MAXimum LI Mit UPPer MI Nimum MAXimum MXB MMFactor lt value gt MINimum MAXimum MXB MMFactor MINimum MAXimum MXB MBFactor lt value gt MINimum MAXimum MXB MBFactor MI Nimum MAXimum DB REFerence lt value gt MINimum MAXimum DB REFerence MINimum MAXimum DBM REFerence lt value gt MINimum MAXimum DBM MI Nimum MAXimum CONFigure CONTinuity DIODe NPut I MPedance AUTO OFF ONJ IMPedance AUTO 170 C 12 I
142. ting slope X is the normal display reading M and B are constants specified by user for scale factor and offset dBm Used for displaying voltage measurement in dBm power unit dB Used for displaying voltage measurement in decibel unit 2 5 Third row without SHIFT button SINGLE Manually triggers the multimeter to make measurements AUTO TRIGGER Instructs the multimeter to make measurements continuously STORE Stores a specified number of subsequent readings RECALL Displays stored readings and buffer statistics Use lt gt or AV searching buttons to toggle between reading number and reading LOCAL Cancels USB or GPIB remote mode SHIFT in blue Used for accompanying other button with upper print in blue and converting function 2 6 Third row with SHIFT button EXTRIG Selects external triggers as the trigger source via BNC port on the rear panel HOLD Holds reading 3 1 The first row in SETUP section lt gt Scrolls through buffer conceals or reveals the digits while 28 measuring 3 2 The second row in SETUP section ESC Cancels selection moving back to measurement display ENTER Accepts selection moving to next choice or back to measurement display LOCK Presses SHIFT then ESC button to prevent unpredictable operation on the panel In order to release lock condition please press ESC again 3 3 The third row in SETUP section CONFIG Offers setting or adjusting function relatin
143. to 4 1 3 and FILTER option Refer to 4 1 2 2 Press ENTER to make choices Then select desired value for it by pressing 4 gt A and V button Press ENTER to choose it For operating this function please press RATIO button and observe the reading on the display as shown as Figure 4 14 X Note To close this function please press one of the measurement function buttons 79 CONFIG RATIO Figure 4 14 Remote Interface Operation Use the following command to make a RATIO measurement CONFigure VOLTage DC RATio lt range gt M N MAX DEF resolution MI N MAX DEF 4 3 2 Percent Definition This mathematical function calculates the ratio of a measurement reading to a specified target value as the form of percentage The calculation formula is shown below Input Reading 100 Target Value The specified target value is store in a volatile memory and will be cleared after the meter has been turned off or a remote interface reset How to use Percent function There are two ways to make a percent measurement Through the front panel operation or through the remote interface operation Front Panel Operation To specify a target value user needs to configure Percent function by pressing CONFIG then use lt and to move through the digits 80 and and V button
144. ture Measurements The M3500A supports thermocouples and resistance temperature detector RTD types of probes For thermocouples M3500A supports 7 types E J K N R S and T Please refer to Table 3 1 for their temperature ranges Be sure that the temperature function is configured for the right sensor type before making measurements Refer to 4 1 8 for how to make the sensor configuration In general RTDs have a better accuracy and long term stability than thermocouples The default RTD type in M3500A is PT100 and the thermocouple is type K Table 3 1 Sensor Type Temperature Temperature Range C Range F E 270 1000 518 1832 J 210 1200 140 2192 K 270 1372 518 2502 N 270 1300 518 2372 R 50 1768 122 3236 S 50 1768 122 3236 T 270 400 518 752 RTD PT 100 200 850 392 1562 43 3 7 1 Thermocouple Measurements Connect the thermocouple adapter to the banana jacks on the front panel The difference between each type is subject to the patch thermal leads X Note Only connection via the front panel can be used for temperature measurements How to measure thermocouple D Use terminals switch to select terminals on the front panel 2 To measure thermocouple must be via thermocouple adapter and the low thermal patch leads as shown in Figure 3 12 When the mentioned modules are well connected as the following figure please go to the next step 3 Configure the thermo
145. ultimeter beeps and an HI or LO message will be shown when the reading exceeds the upper or lower limit respectively Users can specify the limit values and the values are stored in a volatile memory The default values for both upper and lower limits are O This function is available to all except continuity and diode measurements How to set the limits You can set the limits or make a limit testing either through the front panel or the remote interface operation Front Panel Operation To set the limits user needs to configure the LIMITS math function by pressing CONFIG SHIFT RATIO and then use 4 and to locate 84 either lower limit MIN or upper limit MAX Press ENTER to select the limit you wish to set Then use lt and gt to move through the digits and A and V to increase or decrease the numbers to a desired value Press ENTER to set the value The locations of the buttons are shown with red rectangle frames in Figure 4 18 PREV NEXT ENTER Figure 4 18 How to make a limit testing The locations of the buttons are shown with red rectangle frames in Figure 4 19 Select a measurement function for purpose except continuity and diode Enable the limit operation by pressing SHIFT RATIO buttons After enabling the limit function user can set the limit value as mentioned above Observe the displayed reading N
146. um 16 characters are allowed for lower row dot matrix display There are additional annunciators at upper side and right side of the display screen for indicating the state or the condition of an ongoing measurement They are explained individually in the following sections ADRS RMT MAN TRIG HOLD MEM RATIO MATH FILT 4W EXT AUTO 2 2 17 30 2 3 2 1 Annunciators at Upper Side ADRS RMT MAN TRIG HOLD MEM RATIO MATH FILT Figure 2 18 ADRS Indicates the multimeter is controlled via GPIB Interface RMT REMOTE Indicates the remote state USB Interface MAN Indicates the manual range is taken TRIG Shows the single triggering is enabled HOLD Indicates reading hold function is enabled MEM Indicates the using of internal memory RATIO Indicates the ratio operation MATH Indicates the MATH operation is taken ERR Error occurs SHIFT Indicates SHIFT button is pressed REAR The rear panel input terminal is selected for the measurement FILT The digital filter is started 2 3 2 2 Annunciators at Right Side 4W Indicates 4 wire mode is selected for resistance measurement Indicated the continuity testing is enabled gt Indicates the diode testing operation is taken CW Not used for Model M3500A aw EXT CC Not used for Model M3500A AUTO CV Not used for Model M3500A EXT Indicates the External Trigger Mode is enabled pH LOCK Indicates
147. ure with 3 Wire RTD The following Figure 3 15 shows theory diagram of 3 Wire RTD measurement Use terminals switch to select front terminals 2 Insert a specified adapter into the front terminals Connect the low thermal patch leads to the adapter as shown in Figure 3 16 3 Configure sensor type as you would be with 4 wire RTD and unit using 46 CONFIG TEMP and lt or gt When ready press ENTER button Press TEMP button Place RTD in the desired position and take the reading on the display Note When users do the 3 wire RTD measurement the input LO and sense LO have to be connected in short condition Note Source means RTD Probe RTD Simulator PICOTEST M3500A Source S Platinum Short Condition Figure 3 15 4 Probe wy In Short Condition 47 Source Sense 23 wire In Short Condition Source Figure 3 16 3 7 2 3 4 Wire RTD Measurements How to measure temperature with 4 Wire RTD The following Figure 3 17 shows theory diagram of 4 Wire RTD measurement D Use terminals switch to select front terminals 2 Insert a specified adapter into the front terminals Connect the low thermal patch leads to the adapter as shown in Figure 3 18 3 Configure sensor type and unit using CONF
148. urement You can activate null feature from either the front panel operation or the remote interface operation The Front Panel Operation The null measurements can be used with any function except continuity and diode To store the null test lead resistance short the two test leads together and then press NULL button The new reading taken will replace the old value if any in the null register Then connect the two test leads to the input source The value with null offset will show on the display In addition the null offset value can be adjusted manually by pressing CONFIG then NULL Use lt and buttons to move through the digits and use and V buttons to increase or decrease the numbers to a desired value Press ENTER to set the value The locations of the buttons are shown with red rectangle frames in Figure 4 17 Note Press NULL again to disable this feature The MATH anunnciator on the display indicates the state of a mathematical feature 83 CONFIG NULL PREV NEXT ENTER Figure 4 17 The Remote I nterface Operation You can use the following commands on your PC terminal to make a null measurement CALCulate FUNCtion NULL CALCulate STATe OFF ON CALCulate STATe CALCulate NULL OFFSet lt value gt MAXimum MINimum 4 3 5 Limits Test The limits testing operation allows user to adjust a maximal and a minimal limit values The m
149. us Press ENTER on SET SCAN CHA submenu Use 4 and to switch from channel 1 to channel 10 and use and V to switch among the measurement functions Leave an unused channel with a blank space Press ENTER when ten channels are all defined How to configure scan count scan interval and store measurement readings Press CONFIG SHIFT DIGITS for scanning configuration Use and gt buttons to scroll through submenus Press ENTER to select OPERATION submenu Use 4 and gt to switch among scan count COUNT scan interval TI MER and store STORE options Then press ENTER on your selection Use 1 and gt to move through the digits and Aand to increase or decrease the numbers to a desired value For STORE option you can select ON to instruct the meter to store the measurement results for later retrieving or select OFF Press ENTER to set the value How to open and close the channels Press CONFIG SHIFT DIGITS for scanning configuration Use lt and 101 gt buttons to scroll through submenus Press ENTER on when you need to close a specific channel Press ENTER again on CHANNEL Use and gt to move through the digits to increase or decrease the numbers to the desired channel number Press ENTER to close the channel To open all channels simply press ENTER on OPEN ALL option Press SHIFT DIGITS to scan The locations of the buttons are shown with red rect
150. wish to use and then press MIN MAX button to enable the Min Max function To read the min max value the average value or the readings count user can press CONFIG button and then MIN MAX button Use and buttons to switch between those values The locations of the buttons are shown with red rectangle frames in Figure 4 16 Note Press MIN MAX again to disable this feature The MATH anunnciator on the display indicates the state of a mathematical feature MIN MAX CONFIG PREV NEXT Figure 4 16 Remote Interface Operation The following commands show you how to use the Min Max operation from your PC terminal CALCulate FUNCtion AVERage CALCulate STATe OFF ON CALCulate STATe 82 CALCulate AVERage MI Nimum CALCulate AVERage MAXimum CALCulate AVERage AVERage CALCulate AVERage COUNt 4 3 4 Null Definition When null function is enabled the displayed measurement reading is the difference between the measured input signal reading and the stored null also called relative value The null relative value is stored in a volatile memory and the value will be cleared when the multimeter is power off Moreover user can specify or alter a null value The null feature is available for all functions except continuity diode When user selects the null feature for a measurement it is visible only for this measurement How to use null relative meas
151. wo modes for measuring the resistance 2 wire mode as shown in Figure 3 6 and 4 wire mode as shown in Figure 3 7 With 4 wire mode the test current is measured from the test resistance through one pair of the test leads and the test voltage across the resistance under test is measured from another set of the test leads As a result the 4 wire mode is more accurate for low resistance measurements The trade off is the longer settling time for 4 wire mode Figure 3 8 and 3 9 show the input terminal connections on the rear panel for 2 wire mode and 4 wire mode respectively How to measure resistance Selects input signal connections on front or rear panel Connect the test leads to the terminals as shown in Figure 3 6 2 wire or Figure 3 7 4 wire Set RESOLUTION Refer to 4 1 3 or skip this step if default is to be used Press 02 button for 2 wire measurement or SHIFT Q2 buttons for 4 wire measurement Select the auto range function by pressing AUTO button on the front panel or use and V buttons to select the desired range GO Connect test leads to your source signal and observe the reading shown on the display If the input signal is greater than the allowed range an overflow message OVLD will be displayed 38 PICOTEST M3500A Q2 Resistance Under Test Note Source current flows from the INPUT HI to INPUT LO terminals Figure 3 6 PIC
152. y VOLTage RANGe MINimum MAXimum PERiod VOLTage RANGe lt range gt MINimum MAXimum PERiod VOLTage RANGe MI Nimum MAXimum 116 SENSe VOLTage DC RANGe AUTO OFF ON VOLTage DC RANGe AUTO VOLTage AC RANGe AUTO OFF ON VOLTage AC RANGe AUTO CURRent DC RANGe AUTO OFF ON CURRent DC RANGeAUTO CURRent RANGe AUTO OFF CURRent AC RANGe AUTO RESistance RANGe AUTO OFF ON RESistance RANGe AUTO FRESistance RANGe AUTO OFF ON FRESistance RANGe AUTO FREQuency VOLTage RANGe AUTO OFF ON FREQuency VOLTage RANGe AUTO PERiod VOLTage RANGe AUTO OFF ON PERiod VOLTage RANGe AUTO SENSe VOLTage DC RESolution resolution2 MI Nimum MAXimum VOLTage DC RESolution MI Nimum MAXimum VOLTage AC RESolution lt gt Nimum MAXimum VOLTage AC RESolution MI Nimum MAXimum CURRent DC RESolution resolution MI Nimum MAXimum CURRent DC RESolution MI Nimum MAXimum CURRent AC RESolution resolution MI Nimum MAXimum CURRent AC RESolutioin MI MAXimum RESistance RESolution resolution MI Nimum RESistance RESolution MI Nimum MAXimum FRESistance RESolution resolution MI Nimum MAXimum FRESistance RESolution MI Nimum MAXimum SENSe UNIT Cel Far K UNIT TCOuple TYPE E J K N R S T3 TCOuple TYPE 119 TCOuple SIMulated value MINimum MAXimum TCOuple

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