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Giga-tronics ASCOR Model 38xx Users Manual

1. 10 Chapter 5 Internal Settings u uuu tee ecol te reato ecce esa onte ced cbs etna o ee vedo ie da a ve rede 11 S Ju A A PRE REP PA TE EPAR RA EEA O TETE REP ALI ER AI 11 5 2 VXlbus Interrupt Level Selection 11 Chapter G SpecifiCablOLs te NENA A 12 Chapter 8 DMM Input ConnectorS aaa 15 Chapter 9 README FILE FOR 38xx DMM cceeseesseeseceseeeeeeeeeeeeeeeneeeaeecaeecaaecaaecaaecaaesaeeeaeeeaeeseeeseeeeeneeaas 17 Chapter 10 SAMPLE PROGRAMS uuu unus aka nasqa yaa aqa een van cidcid lacada ica 26 10 1 Sample Dc Voltage Measurement Program 26 10 2 Sample Measurement Program 28 Chapter 11 Appendix A Aquiris DMM Manual 33 Page 6 Operation Manual User Manual 07503800 Model 3800 Chapter 1 Introduction 1 1 Safety and Manual Conventions This manual contains conventions regarding safety and eguipment usage as described below 1 1 1 Product Reference Throughout this manual the term Common Core Switching Platform Series 8800 refers to all models of within the series unless otherwise specified
2. if toupper userInput 0 Q as1005 DMMReadNorm Handle amp valueVDC printf The DC Voltage value is Sfinin valueVDC else getVDC lt 0 Terminate DMM as1005 DMMTerminate Handle Close carrier as3801 close Handle return 0 Page 27 Operation Manual User Manual 07503800 Model 3800 10 2 Sample Measurement Program Sample Measurement Program sj J i Copyright C 2003 ASCOR Inc ZA i Program Revision 1 0 0 is Modification History 7 8 ay Include files include lt stdio h gt include lt ctype h gt include include asl005 h include include as3801 h define asl005 FREQ asl005 VAC define asl005 PER asl005 VAC ViSession Handle This program works if the resourceName and the DMM carrier have the same logical address Set the logical address in the resourceName to reflect the setting on the DMM carrier ViRsrc resourceName yxi 2 instr vxi logical address instr int main int argc char argv doubl readMeasurement char userChar userInput 100 functMode Q int exitProg 0 modeMeas printf AinCopyright C 2003 ASCOR Inc n printf Program Revision 1 0 0 n n printf This is a sample program to measure basic modes on ASCOR DMM 1004 1005 n This program works if the resourceName h
3. of reading sec Polarity Frequency range Resolution Width range Typical Uncertainty Positive or negative pulse 1 Hz to 100 kHz 2 us 2ustols 0 01 4 us widths 2 9 5 Totalizer Active edge polarity Positive or negative transition Maximum count 1049 Allowed rate 1 to 30 000 events per second Uses Threshold DAC 2 10 Trigger Functions 2 10 1 External Hardware Trigger Trigger Input voltage level range 43 V to 15 V Minimum trigger input current mA Timing Characteristics Trigger occurs within 2 Reading rate Internal Reading Buffer up to 1 000 readings sec into 64 readings buffer Isolation of trigger input 450 V from analog DMM inputs and from computer chassis earth ground Page 55 Operation Manual User Manual 07503800 Model 3800 2 10 2 Analog Threshold Trigger Captures up to 64 readings Reading rate 10 rps or higher Page 56 Operation Manual User Manual 07503800 Model 3800 2 11 Source Functions MODEL 1005 Isolated to 300 V DC from PC Chassis Current can be paralleled with multiple MODEL 1005s Voltage can be put in series with multiple MODEL 1005s 2 11 1 DC Voltage Source Accuracy 23 C 10 C One Year 0 015 350 1 0 35 mV Typical settling time 3 S rate set to 2 s Typical source resistance 250 Q 1 10 rps or lower measurement rate is required for the closed loop mode 2 11 2 AC Voltage Source Closed Loop 1 Open Loop Output Voltage sine wave 5
4. Contact Information REVISION HISTORY Revision 1 0 3 Modified function asl005 reset to set function mode to VDC with the range 330V took off carrier reseting part and set auto range mode off Added as3801 getMainFrameID Revision 1 0 2 Modified function and control helps in asl005 fp Added as1005 getMainFrameID Renamed all as1005 functions with DMM after prefix as1005 in as1005 h and as1005 c files Revision 1 0 1 Driver is modified to save the DMM number Began calling asl005 functions from this rev Replaced as1005 init function with as 1005dmmInit function Replaced as1005 close function with as 1005terminate function Revision 1 0 0 This is the original revision of ASCOR 3801 3802 DMM n UPDATE NOTES If you have an older version of the VXIplug amp play driver in your system and want to update Make sure that you have the new version available Uninstall the previous version Install the new version of the VXIplug play driver You can download new and updated version of the VXIplug amp play driver from ASCOR web site at http www ascor com downloads htm drivers REQUIREMENTS VXIplug play driver requires the VISA Library VISA32 DLL to be resident in the WINDOWS SYSTEM directory on the system controller for WIN95 WIN98 or in the WINDOWS SYSTEM32 directory for WINNT WIN2000 The software included with this module requires VISA Version 1 0 or higher If you have an older version of V
5. The following conversion chart shows the relationship between the name of the DMM Native Driver Functions and the VXI Plug Play Dmm Driver Functions VXI PLUG amp PLAY DMM DRIVER DMM NATIVE DRIVER FUNCTIONS FUNCTIONS as1005 DMMArmaAnalogTrigger DMMArmanalogTrigger as1005 DMMArmTrigger DMMArmTrigger as1005_DMMBurstBuffRead DMMBurstBuffRead as1005 DMMBurstRead DMMBurstRead as1005 DMMCalibrate DMMcCalibrate as1005 DMMClearMinMax DMMClearMinMax as1005 DMMDelay DMM Delay as1005 DMMDisableTrimDAC DMM DisableTrimDAC as1005 DMMDisArmTrigger DMMDisArmTrigger as1005 DMMDutyCycleStr DMMDutyCycleStr as1005_DMMFrequencyStr DMM FrequencyStr as1005 DMMGetCalDate DMMGetCalDate as1005 DMMGetdB DMMGetdB as1005_DMMGetdBStr DMM GetdBStr as1005 DMMGetDeviation DMMGetDeviation as1005 DMMGetDeviatStr DMMGetDeviatStr as1005 DMMGetFuncRange DMMGetFuncRange Page 94 Operation Manual User Manual 07503800 Model 3800 VXI PLUG amp PLAY DMM DRIVER DMM NATIVE DRIVER FUNCTIONS FUNCTIONS as1005 DMMGetFunction DMMGetFunction as1005 DMMGetGrdVer DMMGetGrdVer as1005 DMMGetHwVer DMMGetHwVer as1005 DMMGetID DMMGetID as1005 DMMGetManDate DMMGetManDate as1005 DMMGetMax DMMGetMax as1005 DMMGetMaxStr DMMGetMaxsStr as1005 DMMGetMin DMMGetMin as1005 DMMGetMinStr DMMGetMinStr as1005
6. printf Connect positive source of AC Voltage to ASCOR DMM V printf Connect negative source of AC Voltage to ASCOR DMM V modeMeas 1 while modeMeas printf Type and lt Enter gt to measure AC Type S and lt Enter gt to stop and Type Q and lt Enter gt to quit the scanf s userInput userChar toupper userInput 0 if userChar S amp amp userChar Q Read measurement asl005 DMMReadNorm Handle printf The AC Voltage value is f else modeMeas 0 if userChar Q exitProg 1 break pre Set ASCOR DMM to DC Voltage mode x Page 29 Operation Manual User Manual 07503800 Model 3800 terminal and n terminal n n Voltage n go back to the selection list n program n amp readMeasurement volts n n readMeasurement case terminal and n terminal n n Frequency n go back to the selection list n program n asl005 DMMSetFunction Handle asl005 VDC printf selected DC Voltage mode n Connection printf Connection n printf Connect positive source of DC Voltage to ASCOR DMM V printf Connect negative source of DC Voltage to ASCOR DMM V modeMeas 1 while modeMeas printf Type and lt Enter gt to measure DC Type S and lt Enter gt to stop and Type Q and lt Enter gt to quit the scanf s userInput userChar toupp
7. Page 74 Operation Manual User Manual 07503800 Model 3800 comparator threshold level For further information on the usage of AC Median value and Peak to Peak measurements and the Threshold DAC see the Frequency and Timing Measurements section below This function requires a repetitive signal The DMM must be in AC voltage measurement mode with the appropriate range selected Page 75 Operation Manual User Manual 07503800 Model 3800 4 2 Current Measurements The MODEL 1004 measures AC and DC currents between 100 nA and 2 5 A Use the I 4WO terminals being certain to always leave the V Q amp terminals disconnected Use the AC DC button to switch between AC and DC The AC current is an AC coupled True RMS measurement function The Current functions are protected with a 2 5 A 250 V fuse The 3 3mA and 33mA ranges utilize a 10Q shunt while the 330mA and 2 5A ranges use a 0 1Q shunt In addition to the shunt resistors there is some additional parasitic resistance in the current measurement path associated with the fuse and the internal wiring Warning Applying voltages gt 35 V to the I I inputs can cause personal injury and or damage to your DMM and computer Think before applying any inputs to these terminals HI 300v 222 Eu vn LO E BV peak MAX 25A 251 Figure 4 2 AC and DC Current measurement connection 4 2 1 Improving Current Measurements When m
8. 1 1 2 Personal Safety Alert A WARNING Indicates a hazardous situation which if not avoided could result in death or serious injury 1 1 3 Equipment Safety Alert CAUTION CAUTION Indicates a situation which can damage or adversely affect the product or associated eguipment 1 1 4 Notes Notes are denoted and used as follows NOTE Highlights or amplifies an essential operating or maintenance procedure practice condition or statement 1 1 5 Electrical Safety Precautions Any servicing instructions are for use by service trained personnel only To avoid personal injury do not perform any service unless you are gualified to do so For continued protections against fire hazard replace the AC line fuse only with a fuse of the same current rating and type Do not use repaired fuses or short circuited fuse holders Page 7 Operation Manual User Manual 07503800 Model 3800 Chapter 2 Configuration Table The 38XX instrumentation VXI modules come in a number of options The 3801 is a C size VXI Module which has a DMM and the ability to mount one industrial standard M Module mezzanine unit Specifications for the M Modules are found in other ASCOR manuals e A3801 1004 is a 3801 with a MODEL 1004 DMM e A3801 1005 is a 3801 with a MODEL 1005 DMM LCR THE 3802 is a C size VXI Module which has a DMM but NO ability to mount M Modules e A3802 1004 is a 3802 with a MODEL 1004 DMM e A3802 1005 is a 3801 with a MOD
9. 4 setteling readings for each measurement and take 50 readings while DMMReady 0 wait for completion for i 0 7 a lt 50 144 read 64 readings from DMM s on board buffer j DMMReadBuffer 0 sBufferli Page 100 Operation Manual User Manual 07503800 Model 3800 DMMBurstRead MODEL 1004 MODEL 1005 Description Setup the DMM for mutiple readings operation sending back measurements as they come int DMMBurstRead int nDmm int iSettle int iSamples Remarks Set the DMM to take multiple measurements sending readings back to the PC This function is similar to the DMMSetTrigRead function with the exception that it does not wait for a hardware trigger to start making measurements Following reception of this command the DMM enters a burst read mode where it takes iSettle 1 readings at the set measurement function range and reading rate and sends the last reading to the PC This process repeats for iSamples Following the issue of this command and until iSamples measurements are read it is necessary to read the samples from the DMM using the DMMReadMeasurement command as fast as they become available This will prevent an Overrun communication error which is an indication that the rate at which measurements are read from the bus do not keep up with the DMM transmission The DMM has five readings Fifo to lessen this problem No autoranging is allowed in this mode This function is usable for VDC VA
10. The internal temperature can also be monitored LEAKAGE 3 Ranges 100 nA 1000nA 3300nA Accuracy is better than 2 096 CAPACITANCE 7 Ranges 10nF 100nF 1uF 10uF 100uF 1mF 10mF Accuracy is better than 2 Page 13 Operation Manual User Manual 07503800 Model 3800 INDUCTANCE 6 Ranges 33uH 330uH 3 3mH 33mH 330mH 3 3H PEAK to PEAK CREST and MEDIAN 4 Ranges 330mV 3 3V 33V 250V Accuracy is better than 1 5 TIMING FUNCTIONS 5 Timing Functions are available ACV Freguency ACI Frequency Duty Cycle Pulse Width amp Totalizer AC DC VOLTAGE SOURCE AND CURRENT SOURCE DC VOLTAGE SOURCE 10 0V TO 10 0v Accuracy is better than 0 1396 AC VOLTAGE SOURCE to 20 V Peak to Peak Accuracy is better than 0 896 DC CURRENT SOURCE 5 Ranges 1 25uA 12 5uA 125uA 1 25mA 12 5mA Accuracy is better than 0 296 Mechanical Thickness 1 200 inches Width 10 317 inches Length 13 78 inches Weight 3 Ibs Environmental Specifications Temperature Operating 09 to 559C Storage 40 to 759C Relative Humidity Operating O to 90 non condensing Storage 0 to 95 non condensing Page 14 Operation Manual User Manual 07503800 Model 3800 Chapter 8 DMM Input Connectors Before using the DMM please take a few moments and review this section to understand where the voltage current or resistance and other inputs and outputs should be applied This se
11. Points to a double that holds the reading Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error Code Example double Buffer 10 int status DMMArmTrigger 0 10 Set up for 10 triggered samples while DMMReady 0 for i 0 i lt 10 i status DMMReadBuffer 0 amp Buffer i Page 140 Operation Manual User Manual 07503800 Model 3800 DMMReadBufferSir MODEL 1004 MODEL 1005 Description Return the next reading formatted for printing int DMMReadBufferStr int nDmm LPSTR pszReading Remarks This function is the same as DMMReadBuffer except the reading is formatted into a string with units Measurements are stored as a null terminated string at the location pointed to by IpszReading Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszReading LPSTR Points to the location that holds the formatted reading string Allow minimum of 64 Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code Example char Buf 64 DMMArmTrigger 0 1 take a single triggered sample while DMMReady 0 DMMReadBufferStr 0 Buf Page 141 Operation Manual User Manual 07503800 Model 3800 DMMReadCrestFactor MODEL 1004 L MODEL 1005 Description Return ACV signal s Cres
12. 0 008 1 5 mV 1 With reading rate set to two readings per second rps or slower and within one hour of DCV zero using Relative control DCV Noise Rejection Normal Mode Rejection at 50 60 or 400 Hz 0 5 is better than 95 dB for reading rates of 10 rps or lower Common Mode Rejection with 1 kQ lead imbalance is better than 120 dB for these conditions 2 2 DC Current Measurement Input Characteristics Burden Voltage 350 mV for all ranges Protected with 2 5A fuse 5x20mm 250 V Fast Accuracy x of reading Amps 1 Full Scale 24 hours 90 Days One Year 23 C 5 V Digits 23 C 5 C 23 C 5 C ids 23 mA 330 000 mA 0 05 30 nA 0 055 40 pA 0 075 60 pA 2 50000 A 10 pA 0 55 50 HA 0 6 200 pA 0 65 350 pA 1 With reading rate set to 2 rps or slower and within one hour of DCI zero using Relative control Page 43 Operation Manual User Manual 07503800 Model 3800 2 3 AC Voltage Measurements Input Characteristics Input Resistance 1 MQ shunted by lt 100 pF all ranges Crest Factor 3 at Full Scale increasing to 7 at Lowest Specified Voltage AC coupled Specified range 10 Hz to 100 kHz Typical Settling time lt 0 5 sec to within 0 1 of final value 2 3 1 AC Voltage True RMS Measurement Range Full Scale 6 Lowest specified Voltage Resolution y EE aomv mV 330 0000mv 0000 mV 5mV Sm O 100 lov 3 300000 V 33 00000 V 100 mV 10 asovi 250 0000 100 uv 1 Between 5 mV
13. From the Web Package or from distribution floppy disk image files You have to unzip Web Package to have zip files Please locate two zip files diskl zip and disk2 zip There are two choices for installing this VXIplugsplay driver From the hard disk or from the floppy disks Hard Disk In Windows 95 98 NT or 2000 create a temporary directory if you do not already have one Unzip both diskl zip and disk2 zip onto the temporary directory Page 19 Operation Manual User Manual 07503800 Model 3800 From the temporary directory run setup exe fil Follow the instructions from the installation program The files copied onto the temporary directory can be deleted after the installation process is completed Floppy Disks Reguires two 3 5 inch formatted disks Create diskl by unzipping files from diskl zip Create disk2 by unzipping files from disk2 zip Insert diskl to the floppy drive From the Taskbar Start menu select the Run option Enter drive setup ex Press enter Follow the instructions from the installation program RESOURCE MANAGER A Resource Manager Resman is a utility defined by the VXIbus specification Its main tasks are to identify all VXI devices in mainframe s allocates logical addresses to those devices in mainframe s and then make sure that the devices have passed their self tests You need to run Resman if you are using MXI VXI controller You do not need to run
14. IDC 330mA OHM 4W 330K etc definitions in the UserDMM h header file Return Value Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero nFuncRnge int A pre defined constant corresponding to the desired function and range The return value is one of the following constants Value Meaning DMM OKAY Operation successfully completed Negative Value Error code DMM E FUNC Invalid DMM function Example status DMMSetFuncRange 0 VDC 33V Page 163 Operation Manual User Manual 07503800 Model 3800 DMMSetFunction MODEL 1004 MODEL 1005 Description Set the DMM function int DMMSetFunction int nDmm int nFunc Remarks This function sets the function used by the DMM The table of values is defined by the VDC VAC IDC IAC OHMS2W and OHMS4W etc definitions in the DMM header file Not all functions are available for all DMM types For instance the MODEL 1005 has Capacitance while the MODEL 1004 does not Parameter nDmm nFunc Type Description int Identifies the DMM DMMs are numbered starting with zero int A pre defined constant corresponding to the desired function Return Value The return value is one of the following constants Value DMM OKAY Negative Value DMM E FUNC Example status Meaning Operation successfully completed Error code Invalid DMM function DMMSetFunction 0 INDUCTANCE Page 164 Operation Manual
15. VXI soft front panel operation sample programs and troubleshooting information The information contained was complete as of the date and revision noted on the readme document HOWEVER you should always consult the readme file that comes with the software driver readme txt for the most current information NOTE The Plug amp Play software driver for the 38XX DMM must be at revision level 2 0 0 or higher in order for the DMM to be compatible with the Model GT 8300A LAN VXI Enclosure README for ASCOR DMM Module Carrier VXIplug play driver for Windows Revision 1 0 2 January 2004 c Copyright ASCOR Inc 2004 All rights reserved This document contains the ASCOR VXIplug play Instrument Driver information for ASCOR 3801 DMM Module Carrier The audience of this document are the following A Users who have our VXIplug play distribution floppy disks B Users who obtained the 3801 zip web package via our website or received the 3801 zip web package via your email C Users who received disk n zip distribution floppy disk image files D Users who already have installed the driver Revision History Update Notes Requirements List Of Files Installation Procedure Resource Manager VXI Soft Front Panel Sample Programs Sample Programs Instruction Required Files for Compiling Linking and Execution Known Issues Troubleshooting Page 17 Operation Manual User Manual 07503800 Model 3800
16. 2 6 for specifics V 300V vo 250V V J 5V peak MAX 25 H Trig eW GUARD Rx Rshunt Figure 4 5 Extended Ohms range Page 80 Operation Manual User Manual 07503800 Model 3800 DCV Source Level Measure Leakage Current Rshunt Figure 4 6 Leakage Test Configuration Measurement of reverse diode leakage at 10V Extended Resistance Measurement Methodology Utilizing the Leakage Measurement configuration in Figure 4 5 high value resistances can be measured Use the following equation to derive the resistance being measured R V I where V is the DC voltage source and I is the leakage current being measured For example if you set the test voltage to 9 0 V and measure 9 nA of leakage current this corresponds to 1 000 MA of resistance This application is useful for testing cables as well as other leakage sensitive objects such as printed circuit boards connectors and semiconductors See Leakage measurement function for more details 4 4 RTD Temperature Measurement MODEL 1005 For temperature measurements the and MODEL 1005 measure and linearize RTDs 4 wire RTD s can be used by selecting the appropriate RTD type Any ice temperature resistance between 25 and 10 can be set for the platinum type RTDs Copper RTDs can have ice temperature resistance values of 5 O to 200 Q The highest accuracy is obtained from 4 wire devices because the resist
17. 9 10 ACI Freguency Counter Test Step Range Input Counter Reading Tolerance Page 189 Operation Manual User Manual 07503800 Model 3800 I5 mA 40 Hz Page 190 Operation Manual User Manual 07503800 Model 3800 6 10 Calibration Each MODEL 1004 DMM uses its own SM40CAL DAT calibration file to ensure the accuracy of its functions and ranges The SM40CAL DAT file is a text file that contains the DMM identification number calibration date and calibration constants for all DMM ranges For most functions the calibration constants are scale factor and offset terms that solve the y mx b equation for each range An input x is corrected using a scale factor term m and an offset term b this gives the desired DMM reading y Keep in mind that for ranges and functions that are unavailable for a particular product in the MODEL 1004 family the calibration record contains a place holder An example SM40CAL DAT is shown card id 10123 type 2044 calibration date 06 15 1999 ad A D compensation 72 0 20 0 vdc VDC 330mV 3 3V 33V 330V ranges offset and gain parameters 386 0 0 99961 37 0 0 999991 83 0 0 999795 8 8 1 00015 vac VAC 1st line DC offset Than offset gain and freq each range 330mV to 250V 5 303 0 84 1 015461 23 0 0043 1 0256 23 0 0 1 02205 0 0 0 1 031386 0 idc IDC 3 3mA to 2 5A ranges offset and gain 1450 0 1 00103 176 0 1 00602 1450 0
18. DMMGetRange DMMGetRange as1005 DMMGetkate DMMGetRate as1005 DMMGetSlot DMMdQGetSlot as1005 DMMGetSourceFreq DMMGetSourceFreq as1005 DMMGetType DMMGetType as1005 DMMGetVer DMMGetVer as1005 DMMinit DMMInit as1005 DMMIsAutoRange DMMIsAutoRange as1005 DMMli slnitialized DMMIsInitialized as1005_DMMIsRelative DMMIsRelative as1005 DMMLoadCalFile DMMLoadCalFile as1005 DMMOpenTerminalCal DMMOpenTerminalCal as1005 DMMPeriodStr DMMPeriodStr as1005 DMMPolledRead DMMPolledRead as1005 DMMPolledReadCmd DMMPolledReadCmd as1005 DMMPolledReadStr DMMPolledReadStr as1005 DMMRead DMMRead as1005_DMMReadBuffer DMMReadBuffer as1005_DMMReadBufferStr DMMReadBufferStr asl1005_DMMReadCrestF actor DMMReadCrestFactor as1005 DMMReadDutyCycle DMMReadDutyCycle Page 95 Operation Manual User Manual 07503800 Model 3800 VXI PLUG amp PLAY DMM DRIVER DMM NATIVE DRIVER FUNCTIONS FUNCTIONS as1005_DMMReadFrequency DMMReadFrequency as1005 DMMReadlnductorO DMMReadInductorQ as1005 DMMReadMeasurement DMMReadMeasurement as1005 DMMReadMedian DMMReadMedian as1005 DMMReadNorm DMMReadNorm as1005 DMMReadPeakToPeak DMMReadPeakToPeak as1005 DMMReadPeriod DMMReadPeriod as1005 DMMReadStr DMMReadStr as1005 DMMReadTotalizer DMMReadTotalizer as1005 DMMReaaWidth DMMReadWidth as1005 DMMReady DMMReady as1005 DMMSetACVSource DMMSetACVSource 51005 DMMSetAutoRange DMMSetA
19. Max 14WQ TRIG Trig 6W Q GUARD GUARD Figure 4 1 Make Voltage ACV measurements with the source ground attached to the MODEL 1004 V Q to minimize Common Mode measurement problems 4 1 3 AC Peak to Peak and Crest Factor Measurement MODEL 1005 Measurement of Peak to Peak Crest Factor and AC Median values requires a repetitive waveform between 30 Hz and 100 kHz The DMM must be in AC voltage measurement mode with the appropriate range selected Knowing the Peak to Peak value of the waveform is useful for setting the Threshold DAC described below This latter function is a composite function and may take over 10 seconds to perform 4 1 4 AC Median Value Measurement MODEL 1005 To better understand the usage of this function you should note that the DMM makes all AC voltage measurements through an internal DC blocking capacitor The voltage is thus AC coupled to the DMM The measurement of the Median value of the AC voltage is a DC measurement performed on the AC coupled input signal This measurement returns the mid point between the positive and negative peak of the waveform The Median value is used for setting the comparator threshold level for best counter sensitivity and noise immunity It is difficult to measure the frequency of a low duty cycle low amplitude AC signal since there is DC shift at the comparator input due to the internal AC coupling The and MODEL 1005 overcome this problem by allowing you to set the
20. V range If the DMM is operated in Autorange with an open input you may hear the DMM relays clicking every few seconds as a range change occurs This is perfectly normal with ultra high impedance DMMs This phenomenon is caused by the virtually infinite input impedance of the 330 mV and 3 3 V DCV ranges On these ranges an open input will read whatever charge is associated with the signal conditioning of the DMM As this electrical charge changes the DMM will change ranges causing the relays to click This is normal 4 1 2 True RMS AC Voltage Measurements ACV is specified for signals greater than 1mV from 10 Hz to 100 kHz The ACV function is AC coupled and measures the true RMS value of the waveform As with virtually all true RMS measuring meters the MODEL 1004 may not read a perfect zero with a shorted input This is normal ACV measurements if possible should have the NEUTRAL or GROUND attached to the MODEL 1004 V Q terminal See Figure 4 1 below This prevents any Common Mode problems from occurring Common Mode refers to floating the DMM V Q LO above Earth Ground Common Mode problems can result in noisy readings Page 73 Operation Manual User Manual 07503800 Model 3800 or even cause the PC to hang up under high V x Hz input conditions In many systems grounding the source to be measured at Earth Ground being certain to avoid any ground loops can give better results 5V peak MAX I LO 25A
21. an external trigger edge of iEdge polarity the DMM takes iSettle 1 readings at the set measurement function range and reading rate and stores the last reading in an internal buffer This process is repeated for iSamples This function is particularly useful in conjunction with a triggering instrument such as the SM4042 relay scanner No autoranging is allowed in this mode The number of trigger edges must be equal or greater than iSamples to properly terminate this mode Between the time the DMMSetBuffTrigRead is issued and the time the buffer is read no other command should be sent to the DMM One exception is the DMMDisarmTrigger command This function is usable for VDC VAC Ohms IAC IDC and RTD measurements Use the DMMReady to monitor when the DMM is ready following trigger s and the reading of iSamples When ready you can read up to iSamples using DMMReadBuffer or DMMReadBufferStr functions Once DMMReady returns TRUE it should not be used again prior to reading the buffer since it prepares the buffer for reading when it detects a ready condition Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iSettle int The number of setteling measurements prior to read value Must be set between 0 and 120 Recommanded value is 4 iSamples int The number of samples the DMM takes following the same number of trigger pulses This number must be between and 64 inclusive iEdge int The e
22. can be read during the accumulation period However it could affect the count by the interruption If no reads are performed during accumulation the input rate can be as high as 45 kHz If reads are performed during the accumulation period this rate could be as low as 20 kHz The Threshold DAC sets the level at which the signals are counted During accumulation no other command except DMMReadTotalizer should be used When done this function must be turned off using DMMStopTotalizer After the Totalizer is stopped the accumulated result can be read using DMMReadTotalizer A normal procedure would be to set the DMM to the ACV function select voltage range set the Threshold DAC start the totalizer wait for the time required stop and read the total The total number of events is limited to 1 000 000 000 The MODEL 1005 allows up to 90 kHz input but reduces the resolution of the count Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Edge int Identifies the edge of the counter If TRAILING 0 count negative edges if LEADING 1 count positive edges Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example int status DMMStartTotalizer 0 LEADING Page 175 Operation Manual User Manual 07503800 Model 3800 DMMStopTotalizer MODEL 1004 O MODEL 1005 Description Terminate the accumulation process of the T
23. current source to dAmps The DMM must be in IDC SRC for this function to execute properly Further the appropriate DCI range must be selected When the DMM is in IDC SRC operation and the DMMSetDCISource is applied reading the DAM DMMRead or DMMReadStr will return the output voltage measurement This function acts on the main 12 bit source DAC If better resolution is needed it can be accomplished by setting the Trim DAC by using the DMMSetTrimDAC function There are five current source ranges The DMM reads the output load voltage using the 33 V range Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IdAmps double FAR DC current to be set Can be 0 to 1 25 X selected range Return Value Integer error code Value Meanin DMM OKAY Operation successfully completed Negative Value Error code Example DMMSetRange 0 1uA Select luA source range DMMSetDCISource 0 1 1e 6 Set source to 1 1uA Page 161 Operation Manual User Manual 07503800 Model 3800 DMMSetDCVSource MODEL 1004 O MODEL 1005 Description Set the DCV source output level int DMMSetDCVSource int 1Dmm double FAR dVolts Remarks This Secondary function sets the DC voltage source to dVolts The DMM must be in VDC SRC for this function to execute properly When the DMM is in VDC SRC operation and the DMMSetDCVSource is applied reading the DMM DMMRead or DMMReadStr will return the measurement
24. displayed approximately ten times a second Page 70 Operation Manual User Manual 07503800 Model 3800 The following functions have not been implemented in the Soft Front Panel as of the date and revision of this manual Any reference to these functions in subseguent sections should be ignored at this time Relative This is the Relative function When activated the last reading is stored and subtracted as reference from all subsequent readings This is a very important function when making low level DCV measurements or in 2WQ For example when using 2WQ you can null out lead resistance by shorting the leads together and clicking on Relative When making low level DC voltage measurements e g in the uV region first apply a copper short to the V O amp input terminals allow the reading to stabilize for a few seconds and click on Relative This will correct for any offsets internal to the DMM The Relative button can also be used in the Percent and dB deviation displays shown below which are activated using the Tools in the top menu Ke LI M ih M BN OL he Min Max box can be used to analyze variations in terms of Min Max Percent and Min Max This display can be activated by selecting the Min Max Deviation from the Tools 0 056238 V menue For instance testing a circuit bandwidth with input of 1V 5 activate the Relative function with the freguency set to 100Hz than sweep gradually the 0 0
25. file card ID field in SM40CAL DAT Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value Integer value card ID code serial number or an error code Value Meaning DMM E DMM Invalid DMM number Example int id lt DMMGetID 0 Page 117 Operation Manual User Manual 07503800 Model 3800 DMMGetManDate MODEL 1004 MODEL 1005 Description Get Manufacturing date stamp from the DMM hardware int DMMGetManDate int int month int day int year Remarks This function returns the DMM manufacturing date which is read from the hardware The month day and year are returned as integers This is used to track the DMM to a specific manufacturing date Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero month int A pointer to an integer where the month is stored day int A pointer to an integer where the day is stored year int A pointer to an integer where the year is stored Return Value Integer error code Value Meanin DMM OKAY Operation was successful DMM E DMM Invalid DMM number Example int month day year status status DMMGetManDate 0 amp month amp day amp year Page 118 Operation Manual User Manual 07503800 Model 3800 DMMGetMax MODEL 1004 MODEL 1005 Description Get the maximum reading history int DMMGetMax int nDmm double FAR pdMax Remarks This functio
26. for increased DC current or in series for increased DC voltage Two digital to analog converters DACs are used for the source functions a 12 bit DAC and a Trim DAC The last augments the 12 bit DAC to form a 16 bit composite DAC and adds an additional 8 bits of resolution For functions requiring high precision use both DACs by selecting the ClosedLoop mode otherwise only the 12 bit DAC is utilized DCI source is limited to the 12 bit DAC only All three source functions use the V Q and the V Q terminals of the MODEL 1005 4 12 1 DC Voltage Source The MODEL 1005 has a fully isolated bipolar DC voltage source Two modes of operation are available fast settling or closed loop In the ClosedLoop mode the DMM monitors the voltage source output and updates it using the composite 16 bit DAC at a rate proportional to the set measurement rate The ClosedLoop mode offers the best accuracy and resolution A 10 rps or lower measurement rate is recommended for the ClosedLoop mode In the fast settling mode no adjustments are made and the 12 bit DAC is used Up to 10 0 V can be sourced with 10 mA maximum drive The output source resistance of the DCV source is approximately 250 DCV Source DCV Measure LO 25A MAX LAWO TRIG Trig 6W amp GUARD GUARD Figure 4 10 Sourcing DC voltage The figure indicates the internal monitoring of the output in closed loop operation Page 88 Operation Manual User Man
27. installed either in your working directory in the Windows system directory or in a directory on your PATH The installation program installs this file in your Windows system directory usually C WINDOWS SYSTEM for Win98 95 or at CAWINNTISYSTEM32 for Windows NT MODEL 100432 H Driver header file Contains the definitions of all the DMM s function prototypes for the DLL constant definitions and error codes Install in a directory pointed to by your INCLUDE environment variable UserDMM H Header file containing all of the necessary DMM s function range rate definitions to be used with the various measure and source functions Msvbvm50 dll Visual Basic run time interpreter Usually install in your CAWINDOWSISYSTEM or equivalent directory If it is not already installed run Msvbvm50 exe for proper extraction and registration MODEL 1005 vbw Visual Basic project file MODEL 1005 frx Visual Basic binary form file MODEL 1005 frm Visual Basic file with main form MODEL 1005 vbp Visual Basic project file 2044glbl bas Visual Basic file with all global DMM declarations File Description MODEL 1005 exe Visual Basic DMM control panel executable Msvert dll System file Installs in your CAWINDOWSISYSTEM directory Page 91 Operation Manual User Manual 07503800 Model 3800 Important Note about the SM40CAL DAT file The file SM40CAL DAT contains calibration information for each DMM and determines the overall analog performa
28. is 0 002 of 4 mHz 20 mHz 200 mHz 2Hz 5Hz reading adder shown Input Signal Range 1 10 200 10 200 10 200 10 200 45 200 of range of range of range of range of range 1 Input RMS voltage required for a valid reading Do not exceed 250 V RMS input For example 10 200 of range indicates that in the 330 mVAC range the input voltage should be 33 mV to 660 mV RMS ACI Mode Input Impedance 10 in the 3 mA and 30 mA ranges 0 1 in the 330 mA and 2 5 A ranges Page 53 Operation Manual User Manual 07503800 Model 3800 Freguency Range 1 Hz 100 Hz 100 Hz 1 kHz 1 kHz 10 kHz 10 kHz 500 kHz 100 miz 0 01 4 mHz 0 01 20 mHz 0 01 200 mHz 0 01 2 Hz Input Signal Range 10 500 10 500 10 500 10 500 3 3 mA 330mA Ranges of range of range of range of range 1 Input Signal Range 50 100 50 100 50 100 50 100 33 mA 2 5A ranges of range of range of range of range 1 Input current reguired to give a valid reading For example 10 500 of range indicates that in the 3 3 mA range the input current should be 0 33 mA to 16 5 mA Page 54 Operation Manual User Manual 07503800 Model 3800 2 9 3 Duty Cycle Measurement Freguency Range 1 Hz to 100 Hz 100 Hz to 1 kHz 1 kHz to 10 kHz 10 kHz to 100 kHz Typical Uncertainty is 0 03 0 3 3 20 0 03 of reading adder shown Full scale reading 100 00 100 00 100 00 100 00 2 9 4 Pulse Width
29. pF 2 8 3 Inductance Measurement MODEL 1005 of reading inductance 1 Range Default Full Scale Resolution Accuracy 23 C 5 C fi m NOR 4 Vo Digits One Year 2 38 000 3 0 500 nH 330 uH 330 00 uH 10 nH 2 0 3 uH 3 3000 mH 100 nt 159 25 ul Page 51 Operation Manual User Manual 07503800 Model 3800 33 000 mi 15 200 i 330 mH 3000mH 104H 2 5 3 mi 100 Hz 3 3000 H 100 uH 3435 mH 1 Within one hour of zero and Open Terminal Calibration 2 Accuracy is specified for values greater than 5 of the selected range Page 52 Operation Manual User Manual 07503800 Model 3800 2 9 Timing Measurements MODEL 1005 2 9 1 Threshold DAC The Threshold DAC is used for selecting a detection threshold to give optimal freguency and timing measurements of setting volts Selected VAC Threshold range DC Threshold Highest allowed input Typical one year setting DAC Vp p uncertainty resolution 330 mV 1 0 V to 41 0 V 1 900 V 0 2 4 mV 10 0 V to 10 0 V 19 00 V 0 2 40 mV 100 0 V to 100 0 V 190 0 V 0 2 0 4 V 250 V 500 V to 500 V 500 V 850 0 V 0 296 4 4 V 1 This table should be used in conjunction with the AC volts section above 2 9 2 Frequency and Period Measurement ACV Mode Input Impedance 1 MO with lt 300 pF Frequency Range 1 Hz 100 Hz 100 Hz 1 kHz 1 kHz 10 kHz 10 kHz 100 kHz 100 kHz 300 kHz Resolution 100 mit m Uncertainty
30. you should use shielded or twisted leads to minimize noise pickup This is especially true for measurements above 1 MO You may also want to control the Ohms current used in making resistance measurements See the Specifications section Resistance 2 wire and 4 wire for a table of resistance range vs current level All of the Ohms ranges of the MODEL 1004 have enough current and voltage compliance to turn on diode junctions For characterizing semiconductor part types use the Diode measurement function To avoid turning on a semiconductor junction you may need to select a higher range lower current When checking semiconductor junctions the DMM displays a resistance value linearly related to the voltage across the junction Page 77 Operation Manual User Manual 07503800 Model 3800 For applications requiring resistance measurements higher than 330 MQ the Extended Resistance Measurement method is available with the MODEL 1005 4 3 2 4 wire Ohm Measurements 4 wire Ohms measurements are advantageous for making measurements below 330 kQ eliminating lead resistance errors The Voltage V Q Input terminals serve as the current Source i e they provide the current stimulus in the ohms measurement and the I 4WQ Input terminals are the Sense inputs The Source and Sense leads are connected to one side of the resistor and the Source and Sense leads are connected to the other side Both Sense leads should be clos
31. 0mV to 7 1 V RMS 0 14 to 20 0V peak to peak DAC resolution 12 bits Typical Current Drive at 3 5V RMS 3 5 mA RMS Accuracy 18 C i 28 One Year ACV spec 2 mV ACV spec 0 8 20 mV Typical settling time f out gt 40 Hz 10 s rate set to 2 rps Typical source resistance 2500 Freguency range resolution 2 Hz to 75 kHz 2 Hz Frequency stability 100 ppm 1 Hz 1 5 rps or lower measurement rate is required for the closed loop mode 2 11 3 DC Current Source Range Compliance Voltage Resolution 1 Minimum level Accuracy 23 C 10 C One Year 1 25 pA 4 2V 500 pA 1 nA 1 10nA 12 5 pA 4 2 V 5nA 10 nA 1 100 nA 125 pA 4 2 V 50 nA 100 nA 1 500 nA Page 57 Operation Manual User Manual 07503800 Model 3800 1 25 mA 4 2 V 500 nA l uA 1 5 uA 12 5 mA 1 5 V SuA 10 uA 1 50 uA 1 Resolution without Trim DAC The use of the Trim DAC can improve the resolution by a factor of 10 but it has to be set separately since it is not calibrated Page 58 Operation Manual User Manual 07503800 Model 3800 2 12 Accuracy Notes Important All accuracy specifications for DCV Resistance DCI ACV and ACI apply for the time periods shown in the respective specification tables To meet these specifications the System Calibration function must be performed once a day System Calibration is a simpl
32. 1 00482 176 0 1 00001 iac IAC 3 3mA to 2 5A ranges offset and gain 1 6 1 02402 0 0 1 03357 1 69 1 00513 0 0 1 0142 2w ohm Ohms 33 330 3 3k 33k 330k 3 3M 33M 330Meg ranges offset and gain 1 27e 4 1 002259 1256 0 1 002307 110 0 1 002665 0 0 1 006304 0 0 1 003066 Page 191 Operation Manual User Manual 07503800 Model 3800 0 0 1 001848 0 0 0 995664 0 0 1 00030 The first column under any function e g VAC is the offset term b expressed as a value proportional to analog to digital a d counts The second column is the scale factor term m Within each function the b and m terms are listed with the lowest range at the beginning For example under 2w ohm above 1 27e 4 1 002259 represents the offset term for the 33 O range and 1 002259 is the scale factor for this range This record must be for the MODEL 1005 since the MODEL 1004 does not have the 33 Ohms range and therefore these values will be set to 0 0 and 1 0 For the ACV function the first line in the calibration record is the DC offset value The rest of the lines contain the RMS offset gain correction factor and a third column that represents a digital code from 0 to 31 that controls the high frequency performance of each AC function A large value e g 31 implies high attenuation The SM40CAL DAT file is created by performing external calibration The general calibration algorithm consists of applying a zero value to the DMM followe
33. 1 32 lib and as1005 1ib The following dynamic link library files are required for execution as3801 32 411 smv2040 dll asXMod 32 dll and 1005 32 dll These files are installed automatically during the ASCOR 3801 VXIplug play driver installation These files are located in different folders for different frameworks WIN 95 and WIN NT WIN 95 Framework Compiling C vxipnp Win95 include as3801 h C vxipnp Win95 include as1005 h Linking See Note Below C vxipnp Win95 lib msc as3801 32 1ib C vxipnp Win95 lib msc as1005 1lib Execution C vxipnp Win95 bin as3801 32 dll C Windows System smv2040 d11 C vxipnp Win95 bin asxXMod_32 dll1l C vxipnp Win95 bin as1005 32 dll WIN NT Framework Compiling C vxipnp WinNT include as3801 h C vxipnp WinNT include as1005 h Linking See Note Below C vxipnp WinNT lib msc as3801 32 1ib C vxipnp WinNT lib msc as1005 lib Execution C vxipnp WinNT bin as3801 32 dll C Windows System32 smv2040 d11 C vxipnp WinNT bin asXMod_32 dll C vxipnp WinNT bin as1005 32 dll Note For Borland builder substitute msc with bc folder For Symantec builder substitute msc with sc folder For Watcom builder substitute msc with wc folder Page 23 Operation Manual User Manual 07503800 Model 3800 KNOWN ISSUES ASCOR VXIplug play 3801 driver suppli
34. 10 to 1000 readings per second No autoranging is allowed for this trigger operation Between the time the DMMTrigger command is issued and the time the buffer is read no other commands should be sent to the DMM Use the DMMReady function to monitor when the DMM is ready ready implies completion of iSamples When ready you can optionally read a single reading or up to iSamples using DMMReadBuffer Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iSamples int The number of samples the DMM takes following a trigger pulse This number must be between 1 and 64 inclusive Return Value The return value is one of the following constants Value Meaning DMM OKAY Operation successfully terminated DMM E INIT DMM is uninitialized Must be initialized prior to using any function DMM TRIG N Measurement count is out of allowed range DMM E DMM Invalid DMM number Example double Buffer 64 int state DMMTrigger 0 64 while DMMReady 0 for i 0 i lt 64 i state DMMReadBuffer 0 amp Buffer i Page 177 Operation Manual User Manual 07503800 Model 3800 DMMWidthStr MODEL 1004 O MODEL 1005 M Description Return positive and negative pulse width in string format int DMMWidthStr int nDmm LPSTR pszPos LPSTR IpszNeg Remarks This Secondary function is the string eguivalent of DMMReadWidth The measurement results are stored at the location pointed to by
35. 103 DMMDelay 104 DMMDisableTrimDAC 105 DMMDisArmTrigger 106 DMMDutyCycleStr 107 DMMFrequencyStr 108 DMMGetCalDate 109 DMMGetdB 110 DMMGetdBStr 111 DMMGetDeviation 112 DMMGetDeviatStr 113 DMMGetFuncRange 114 DMMGetFunction 115 DMMGetGrdVer 116 DMMGetHwVer 116 DMMGetID 116 DMMGetManDate 118 DMMGetMax 119 DMMGetMaxStr 120 DMMGetMin 121 Page 36 Operation Manual User Manual 07503800 Model 3800 DMMGetMinStr 122 DMMGetRange 123 DMMGetRate 124 DMMGetSlot 125 DMMGetSourceF req 126 DMMGetType 127 DMMGetVer 128 DMMInit 129 DMMIsAutoRange 130 DMMIsInitialized 131 DMMlIsRelative 132 DMMLoadCalFile 133 DMMOpenTerminalCal 134 DMMPeriodStr 135 DMMPolledRead 136 DMM PolledReadCmd 137 DMM PolledReadStr 138 DMMRead 139 DMMReadBuffer 140 DMMReaaBufferStr 141 DMMReadCrestFactor 142 DMMReadDutyCycle 143 DMMReadFrequency 144 DMMReadlnductorQ 145 DMMReadMeasurement 146 DMMReadMedian 147 DMMReadNorm 148 DMMReadPeakToPeak 149 DMMReadPeriod 150 DMMReadStr 151 DMMReadTotalizer 152 DMMReadWidth 153 DMMReady 154 DMMSetACVSource 155 DMMsSetAutoRange 156 DMMsSetBufflrigRead 157 Page 37 Operation Manual User Manual 07503800 Model 3800 DMMSetCapsMeasure 158 DMMSetCompThreshold 159 DMMSetCounterRng 160 DMMSetDCTSource 161 DMMSetDCVSource 162 DMMsSetFuncRange 163 DMMSetFunction 164 DMMSetlnductFreg 165 DMMSetkange 166 DMMSetRate 167 DMMSetkelative 168 DMMSetRTD 169 DMMSetSourceMode 170 DMMSetSynchro
36. 10795 v reguency and monitor the percent deviation as well as the dBV error and capture dB Diviation any response anomalies with the Min Max display The left display indicates peaking 002 468 lof 2 468 0 21 dBV and maximum peaking in the response of 56 24mV and a notch 000 21 of 10 79mV from the reference at 100Hz Rate Box Controls the DMM reading rate 0 1 rps to 1 000 rps can be set As measurement rate increases so does the measurement noise For best accuracy set to the lowest rate acceptable for the application Also consider the line frequency 50 60 Hz of operation when setting reading rates as certain reading rates have more noise rejection at either 50 or 60 Hz See Specifications for details Set the measurement rate as low as practical for the application When measuring RMS values there is no point setting the measurement rate to a value higher than 5 rps since the RMS circuitry has a settling time that is over a second The capacitance function is not affected by rate setting For inductance measurements use 10 rps or slower measurement for best accuracy Note on Measurement Rate All three products are capable of continuous measurement as well as data transfer rates of up to 1 000 rps To achieve the 6 1 2 digit resolution and accuracy the DMM should be operated at 10 rps or Slower The maximum reading rate for 5 1 2 digits is 30 rps S_Cal This function is the System Calibration that corrects
37. 2nF range from 0 8s to about 50ms Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iAverage int The average value must be set between 1 and 100 iSamples int The number of samples must be set to at least 3 Return Value The return value is one of the following constants Value Meaning DMM OKAY Valid return Negative Value Error code Example double Buffer 64 DMMSetCapsMeasure 0 1 3 Page 158 Operation Manual User Manual 07503800 Model 3800 DMMSetComp Threshold MODEL 1004 LI MODEL 1005 Description Set the Threshold DAC level int DMMSetCompThreshold int nDmm double FAR d7hreshold Remarks This Secondary function sets the output of the Threshold DAC To use this function the DMM must be in AC volts This function sets the detection threshold of the AC comparator It is compared by the comparator to the AC coupled input voltage This function is associated with the following functions Totalizer Frequency counter Period Pulse width and Duty Cycle measurements dThreshold range is determined by the selected ACV range For instance when the 250 V AC range is selected the allowed range of IdThreshold is 500 V to 500 V See the specification section for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IdThreshold double FAR DC voltage to be set Allowed range depends on selected ACV range Return Value In
38. 3800 Model 3800 1 Error does not include external shunt resistor s tolerance 2 7 RTD Temperature Measurement MODEL 1005 RTD Type Ro Q Resolution Temperature Temperature Accuracy 23 C 5 C 1 range One Year pt385 pt3911 100 200 Q 0 01 C 150 to 650 C 0 06 C pt3916 pt3926 pt385 pt3911 500 1 kO 0 01 C 150 to 650 C 0 03 C pt3916 pt3926 Cu Copper Less than 12 Q 0 01 C 100 to 200 C 0 18 C for temperatures lt 20 C 0 05 C otherwise Cu Copper Higher than 90 0 01 C 100 to 200 C 0 10 C for temperatures lt 20 C 0 05 C otherwise With reading rate set to 2 rps or slower using a 4 wire RTD Measurement accuracy does not include RTD Page 50 Operation Manual User Manual 07503800 Model 3800 2 8 Additional Component Measurement Capability 2 8 1 Diode Characterization Available DC current values 100nA 1 uA 10 A 100 uA and 1 mA MODEL 1005 10 mA constant current plus variable current from 10 nA to 12 5 mA Typical Current Value Uncertainty 1 Typical Voltage Value Uncertainty 0 02 Maximum diode voltage compliance 4 V 2 8 2 Capacitance Measurement MODEL 1005 Accuracy of reading Farads 1 Full Scale One Year 23 5 C Digits 1 Within one hour of zero using Relative control Accuracy is specified for values higher than 596 of the selected range with the exception of the 10 nF range which measures down to 0
39. ARACTERIZATION 82 4 7 CAPACITANCE MEASUREMENT MODEL 1005 ONLY 82 4 8 INDUCTANCE MEASUREMENT MODEL 1005 ONLY 83 4 9 CHARACTERISTIC IMPEDANCE MEASUREMENT MODEL 1005 ONLY 4 10 TRIGGER OPERATION 83 4 10 1 External Hardware Trigger 83 4 10 2 Analog Threshold Trigger 84 4 10 3 Software Issued Triggered Operations 64 4 11 FREQUENCY AND TIMING MEASUREMENTS MODEL 1005 ONLY 84 4 11 1 Threshold DAC 64 4 11 2 Frequency and Period Measurements 86 4 11 3 Duty Cycle Measurement 86 4 11 4 Pulse Width 87 4 11 5 Totalizer 87 4 12 SOURCING FUNCTIONS MODEL 1005 ONLY 87 4 12 1 DC Voltage Source 88 4 12 2 AC Voltage Source 89 4 12 3 DC Current Source 89 4 12 4 Source Current Measure Voltage 90 4 12 5 Source Voltage Measure Current 90 74 80 83 Page 35 Operation Manual User Manual 07503800 Model 3800 5 0 DMM WINDOWS INTERFACE 5 1 DISTRIBUTION FILES 91 5 2 THIS SECTION REMOVED AT THIS TIME ERROR BOOKMARK NOT DEFINED Error Bookmark not defined 5 3 THIS SECTION REMOVED AT THIS TIME ERROR BOOKMARK NOT DEFINED Error Bookmark not defined 5 4 THIS SECTION REMOVED AT THIS TIME ERROR BOOKMARK NOT DEFINED 5 5 THIS SECTION REMOVED AT THIS TIME ERROR BOOKMARK NOT DEFINED 5 6 WINDOWS COMMAND LANGUAGE 94 DMMArmanalogTrigger 98 DMMArmTrigger99 DMMBurstBuffRead 100 DMMBurstRead 101 DMMCalibrate 101 DMMClearMinMax
40. C Ohms IAC IDC and RTD measurements Measurement rate should be set to 10rps or higher The total time it takes to complete this process is equal to iSamples iSettle 1 measurement rate Use the DMMReadMeasurement to monitor when reading becomes available and to read the data Read as many samples as iSamples to guarantee proper conclusion of this capture process Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iSettle int The number of setteling measurements prior to read value Must be set between 0 and 250 Recommanded value is 4 iSamples int The number of samples the DMM takes following the same number of trigger pulses This number must be between 1 and 32 000 inclusive Return Value The return value is one of the following constants Value Meaning DMM OKAY Operation successfully terminated Negative Value Error code Example double Reading 250 DMMBurstRead 0 10 250 settle 10 reads 250 samples for i 0 lt 250 it read 250 meas as they come while DMMReadMeasurement 0 Reading i DMMCalibrate MODEL 1004 MODEL 1005 Description Internally calibrate the DMM Page 101 Operation Manual User Manual 07503800 Model 3800 int DMMCalibrate int nDmm Remarks This function re calibrates the DMM and returns it to the current operating mode Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting wit
41. DMM is located in I O space reads the card id and calibration_date and then reads the corresponding calibration information from the SM40CAL DAT file During initialization DMMInit the driver reads various parameters such as DMM type MODEL 1004 42 44 and serial number and then reads the corresponding calibration information from the SM40CAL DAT file The DMMInit function reads the information from these files to initialize the DMM DMMInit accepts parameters that are the names of these files A qualified technician may modify individual entries in the calibration file then reload them using the DMMLoadCalFile command Page 93 Operation Manual User Manual 07503800 Model 3800 5 6 Windows Command Language The following section contains detailed descriptions of each function of the Windows command language Those commands that pertain to only the MODEL 1004 are indicated Most functions return an error code The code can either be retrieved as a string usinge DMMErrString function or looked up in the SM204032 H header file The UserDMM H file contains all the pertinant definitions for the DMM ranes functions etc The following description for the various functions is based on C function declarations Keep in mind that the Windows DLL containing these functions assumes all int values to be windows 32bit integers corresponds to VisualBasic long type TRUE is equal to 1 and FALSE to 0 which is different from VisualBasic
42. DMMArmTrigger is issued and the time the buffer is read no other command should be sent to the DMM One exception is the DMMDisarmTrigger command This function is usable for VDC VAC Ohms IAC and IDC Use the DMMReady to monitor when the DMM is ready following trigger and the reading of iSamples When ready you can read up to iSamples using DMMReadBuffer or DMMReadBufferStr functions Once DMMReady returns TRUE it should not be used again prior to reading the buffer since it prepares the buffer for reading when it detects a ready condition Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iSamples int The number of samples the DMM takes following a trigger pulse This number must be between 1 and 64 inclusive Return Value The return value is one of the following constants Value Meaning DMM OKAY Operation successfully terminated Negative Value Error code Example double Buffer 64 DMMArmTrigger 0 64 while DMMReady 0 for i 0 i lt 64 i j DMMReadBuffer 0 amp Buffer i Page 99 Operation Manual User Manual 07503800 Model 3800 DMMBurstBuffRead MODEL 1004 MODEL 1005 Description Setup the DMM for Triggered operation int DMMBurstBuffRead int nDmm int iSettle int iSamples Remarks Following reception of this command the DMM enters a burst read mode where it takes iSettle 1 readings at the set measurement function range and re
43. EL 1005 DMM LCR Page 8 Operation Manual User Manual 07503800 Model 3800 Chapter 3 Functional Description 3 1 Introduction The purpose of this manual is to provide the technical specifications for the Digital MultiMeters DMM use in the ASCOR 38XX series of VXI modules and other ASCOR instrumentation units 3 2 General Description There are two different DMM s offered with the 38XX Series VXI instrumentation modules The MODEL 1004 provides standard DMM functions such as AC amp DC Voltage and Current measurements and 2 and 4 wire Resistance measurements The MODEL 1005 provides all the capabilities of the MODEL 1004 and in addition provides additional features such as 6 wire resistance measurements Inductance and Capacitance measurements and AC and DC voltage and current Sourcing A complete summary of the features of the MODEL 1004 and MODEL 1005 are shown in the following pages Detailed specifications are shown in the body of the manual Page 9 Operation Manual User Manual 07503800 Model 3800 Chapter 4 Controls and Indicators The following controls and indicators are provided to select and display the functions of the ASCOR 38xx Module s operating environment 4 1 VXI Logical Address The Logical Address Switch is dual circular switches D1 and D2 which are located at the rear of the module The address can be set to any value between 1 and 255 decimal or 1 and FF hexadecimal address 0 is r
44. FrequencyStr to get the measured frequency because the DMM frequency counter uses a frequency ranging scheme which gets activated only when a frequency or period reading function is received If the previously measured frequency was Hz and the frequency being measured is 300 kHz or vise versa it might take as many as six calls to DMMFrequencyStr or any of the other frequency measurement functions to read the correct frequency This function is a Secondary function which requires the DMM to be in either VAC or IAC function and at the appropriate range Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszReading LPSTR Points to a buffer at least 64 characters long to hold the converted result Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed DMM_CNT_RNG Frequency counter is over or under range Negative Value Error code Example char cBuf 64 int status status DMMFreguencyStr 0 cBuf Page 108 Operation Manual User Manual 07503800 Model 3800 DMMGetCalDate MODEL 1004 MODEL 1005 M Description Return the calibration date string from the DMM int DMMGetCalDate int nDmm LPSTR pszCalDate Remarks This function reads the calibration date string from the structure Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszCalDate LPSTR Points to a buf
45. ISA for your embedded controllers or VXI interfaces please contact your system controller vendor s for upgrade kits LIST OF FILES Web Package Page 18 Operation Manual User Manual 07503800 Model 3800 The 3801 zip web package consists of the following files diskl zip First VXIplugsplay Distribution Diskette zip file disk2 zip Second VXIplug amp play Distribution Diskette zip file vppCover doc ASCOR cover letter vppOA doc ASCOR VXIplug play driver questions and answers readme txt This readme file Distribution Diskettes Diskette 1 of 2 as3801 001 First compressed data file for setup exe ascor c bmp Background file for setup exe ascor m bmp Background file for setup exe setup exe Installation program for this VXIplug amp play driver readme txt This readme file Diskette 2 of 2 as3801 002 Second compressed data file for setup exe If the web package or the distribution diskettes do not contain all of the above files or appears to be damaged please contact ASCOR Inc INSTALLATION PROCEDURE Follow the appropriate installation procedure based on the audience list found at the beginning of this document Users A Using the VXIplug play distribution floppy disks Insert diskl to the floppy drive From the Taskbar Start menu select the Run option Enter drive setup ex Press enter Follow the instructions from the installation program Users B and C
46. Init int nDmm LPCSTR I pszCal Remarks This function must be the first function to be executed It opens the driver for the specified DMM The first DMM becomes 0 the second 1 etc It also initializes the DMM hardware and software and reads the appropriate calibration record for the respective DMM from the file specified by IpszCal Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero lpszCal LPCSTR Points to the name of the file containing the calibration constants for the DMM Calibration information is normally read from the file named SM40CAL DAT located in the current directory Return Value The return value is one of the following constants Value Meaning DMM_OKAY DMM initialized successfully Negative Value Error code Example initialize DMM int i DMMInit 0 C SM40CAL dat Initialize the first DMM Page 129 Operation Manual User Manual 07503800 Model 3800 DMMIsAutoRange MODEL 1004 MODEL 1005 Description Get the status of the autorange flag int DMMIsAutoRange int nDmm Remarks This function returns the DMM autorange flag state Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value TRUE FALSE or an error code Value Meaning TRUE Autoranging mode is selected FALSE Autoranging mode is not selected DMM E DMM Invalid DMM number Example int autorange DMMIsAutoRange 0 Page 130 Oper
47. MMReady to monitor when the DMM is ready When ready you can read up to iSamples using DMMReadBuffer or DMMReadBufferStr functions Once DMMReady returns TRUE it should not be used again prior to reading the buffer since it prepares the buffer for reading when it detects a ready condition Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iSamples int The number of samples the DMM takes following a trigger pulse This number must be between 1 and 64 inclusive dThresh double FAR Analog level trigger threshold value Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully terminated Negative value Error code Example double Buffer 64 DMMArmAnalogTrigger 0 64 1 5 while DMMReady 0 for i 0 i lt 64 i j DMMReadBuffer 0 sBufferli Page 98 Operation Manual User Manual 07503800 Model 3800 DMMArm Trigger MODEL 1004 MODEL 1005 Description DMM for external trigger operation int DMMArmTrigger int nDmm int iSamples Remarks Setup the MODEL 1004 for external hardware trigger operation Following reception of this command the DMM enters a wait state After reception of an external trigger pulse the DMM makes iSamples readings at the set function range and reading rate and stores them in an internal buffer No autoranging is allowed for external trigger operation Between the time the
48. Manual 07503800 Model 3800 5 0 DMM Windows Interface 5 1 Distribution Files The main directory of the distribution diskette contains the Microsoft Windows MODEL 1004 DMM software Before installing the DMM or software read the Quick Install page carefully To install this software enter the command A SETUP in the Run Program menu of the Windows File Manager or double click on the SETUP EXE file name from the File Explorer Tool Manager window Most files on this diskette are compressed and must be installed using the SETUP program The MODEL 1004 DLL is a protected mode Microsoft Windows DLL that will control the Ascor DMM It is provided with a sample Visual Basic front panel application to demonstrate the DMM and the interface to the DLL Check the README TXT file for more information about the files contained on the diskette Some important files to note are File Description SM40CAL DAT Configuration file containing calibration information for each DMM Do not write into this file unless you are performing an external calibration This file is normally placed at the C root directory by the setup program and should be left there It may contain calibration records for several DMMs MODEL 100432 LIB The Windows import library Install in a directory pointed to by your LIB environment variable MODEL 100432 DEF MODEL 1004 driver DLL module definition file MODEL 100432 DLL The 32 bit driver DLL This should be
49. Model 3800 Revision History Revision Description of Change Chg Order Approved By Initial Release 7 03 Updated 8 03 Updated Updated 5 04 Updated 9 09 Updated 9 10 O Tm m OJOJ U gt Reformatted 3 12 RCW Page 5 Operation Manual User Manual 07503800 Model 3800 Contents ejl cp ERE 6 Chapter 1 IntroOQUctl ON rere rer RE ene ost pae rogi Ur en Ee 7 1 1 Safety and Manual Conventions 7 1 1 1 Product Reference eee tese la neu P eren iaa 7 1 1 2 Personal Safety Alert cec aaa 7 1 1 3 Equipment Safety Alert 7 unl 7 1 1 5 Electrical Safety Precautions u un nu namun aede eode 7 Chapter 2 Configuration Table a Pete pus veg wash ents 8 Chapter 3 Functional Desctiption ertet etc ei rto aie tec Ma uie ten ced ete d 9 EB gore eio RR 9 3 2 General Description ccce ias 9 Chapter 4 Controls and Indicators 1 u a en NA pe d eu ove ai A ded ease 10 4 1 VXI Logical Address siste i as Laia 10 Z22 LLL 10 ADA BUS LED uuu prsa reki siasa ta raj aa o locos ed Ne a 10 tali
50. Model 3800 DMMRead nductorQ MODEL 1004 O MODEL 1005 Description Return inductor s O value int DMMReadInductorQ int nDmm double FAR pdResult Remarks This is a Secondary function and the DMM must be in the Inductance measurement function and a valid inductance value must have been read prior to using this function Resulting O is stored as double precision floating point number in the location pointed to by pdResult Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdResult double FAR Points to a double that holds the inductor s O value Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code Example double 0 int status DMMReadInductorQ 0 amp Q Page 145 Operation Manual User Manual 07503800 Model 3800 DMMReadMeasurement MODEL 1004 MODEL 1005 Description Return a reading from the result of DMMSetTrigRead operation int DMMReadMeasurement int nDmm double FAR pdRead Remarks This measurement reading function is designed to read triggered measurements from the DMM It is a fast reading function It returns FALSE while no new reading is ready If a reading is ready TRUE is returned and the result in the form of a 64 bit double precision floating point number is placed at the location pointed to by IpdRead The returned value is in base units That is
51. Resman with GPIB VXI controller If you are using National Instruments Software Resman exe is located in National Instruments Vxi folder is the directory where you install VXI C Program Files is default directory And you can run Resman from Start gt gt Programs gt gt National Instruments gt gt Vxi gt gt Resman SOFT FRONT PANEL and The Soft front panel program provides interactive session between end user the instrument Soft front panel program uses graphical user interface technology to present the equivalent of knobs buttons and controls user manipulates these controls with a mouse or with the computer keyboard Soft front panel program introduces the instrument and gives a demonstration of its capability Depending on the complexity of the soft front panel all of instrument driver commands may be exercised making the soft front panel an excellent driver testing tool as well To run ASCOR 3801 Front Panel Start gt gt Programs gt gt Vxipnp gt gt as3801 Front Panel SAMPLE PROGRAM ASCOR provides two sample programs along with ASCOR 3801 3802 driver Page 20 Operation Manual User Manual 07503800 Model 3800 These sample programs demonstrate how to control ASCOR DMM 1004 1005 using our ASCOR 3801 380 VXIplug amp play Instrument Driver These programs are installed as part of the ASCOR 3801 3802 VXIplug play Instrument Driver Before running
52. Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example double FAR f int status DMMGetSourceFreq 0 amp f Page 126 Operation Manual User Manual 07503800 Model 3800 DMMGetType MODEL 1004 MODEL 1005 Description Get the type of the DMM int DMMGetType int nDmm Remarks This function returns the DMM type Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value DMM type Integer or an error code Value Meaning 2040 MODEL 1004 is at nDmm slot 2044 MODEL 1005 is at nDmm slot Negative Value Error code Example int type DMMGetType 0 Page 127 Operation Manual User Manual 07503800 Model 3800 DMMGetVer MODEL 1004 MODEL 1005 Description Get DMM software driver version int DMMGetVer int nDmm double FAR pfResult Remarks This function returns the DMM software driver version which is a double floating value Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpfResult double FAR Pointer to the location which holds the version Return Value Integer error code Value Meaning Negative Value Error code Example int status double ver status DMMGetVer 0 amp ver Page 128 Operation Manual User Manual 07503800 Model 3800 DMMInit SM2040 SM2042 SM2044 Description Initialize a DMM int DMM
53. SetSynchronized MODEL 1004 M MODEL 1005 M Description Enable or disable Synchroneous operation of the DMM int DMMSetSynchronized int nDmm BOOL bSync Remarks This function enables or disables the Synchronized operation of the DMM The default operation is non synchronized Select the Synchronized mode when it is necessary to settle full scale input transitions from one reading to the next and maintain the accuracy of the DMM This is appropriate for VDC Ohms Leakage DCI Diode and Guarded Ohms The result of the synchronized mode is a reduced measurement rate To run synchronized reading rate must be set to 10 rps or higher Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero bSync BOOL Determines whether or not synchronized operation is enabled TRUE enables and FALSE disables synchronization The default is FALSE Return Value The return value is one of the following constants Value Meaning DMM_OKAY Function succeeded Negative Value Error code Example int status DMMSetSynchronized 0 FALSE Cancell sync Page 171 Operation Manual User Manual 07503800 Model 3800 DMMSetTempUnits MODEL 1004 O MODEL 1005 Description Set temperature units to C or F int DMMSetTempUnits int nDmm int iTempUnits Remarks This function sets the temperature units to either C or F This is applicable to both the on board temperature sensor and the RTD measurements Param
54. Source MODEL 1004 O MODEL 1005 Description Set the ACV source output level and frequency int DMMSetA CVSource int nDmm double FAR dVolts double FAR dFreq Remarks This Secondary function sets the AC voltage source to RMS amplitude of dVolts and the frequency to dFreq The DMM must be in VAC SRC operation for this function to execute properly When the DMM is in VAC SRC operation and the DMMSetA CVSource is applied reading the DMM DMMRead DMMReadStr will return the measurement of the output voltage This function acts on the main 12 bit source DAC If better accuracy is needed it can be accomplished by selecting the ClosedLoop mode DMMSetSourceMode This mode engages the Trim DAC which augments the 12 bit DAC to produce 16 effective bits In the ClosedLoop mode the source level is adjusted any time the DMM is read making small corrections until the reading is equal to IdVolts However for the ClosedLoop mode to update the source level it is necessary to read the DMM multiple times Update rate should not exceed 5 rps when using the Closed Loop mode Two ACV measurement ranges are available in VAC SRC mode the 3 3 V and the 330 mV If the Autorange mode is enabled the DMM will automatically select the appropriate range Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero ldVolts double FAR AC RMS voltage to be set Range 0 05 to 7 25 V RMS ldFreq double FAR Source frequency t
55. User Manual 07503800 Model 3800 DMMSetinductFreq MODEL 1004 O MODEL 1005 Description Set the freguency of the Inductance Source int DMMSetInductFreg int nDmm double FAR pdFreq Remarks This function sets the freguency of the Inductance measurement source The value of the frequency should be between 20 Hz and 75 kHz This function overrides the default frequency for each of the inductance ranges Therefore setting a new Inductance measurement range changes the frequency Use this function after setting the range Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdFreq double FAR Frequency to be set Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example int status DMMSetInductFreq 0 10e3 Set source to 10kHz Page 165 Operation Manual User Manual 07503800 Model 3800 DMMSetRange MODEL 1004 MI MODEL 1005 Description Set the DMM range for the present function int DUMSetRange int nDmm int nRange Remarks This function sets the range used by the DMM for the present function The table of values is defined by the _330mV _3300uA etc definitions in the DLL header file Not all ranges are available for all DMM types For instance the MODEL 1005 has a 33 Ohms range and the MODEL 1004 does not Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero
56. User Manual 07503800 Model 3800 Model 38xx Digital Multi Meter 90401280 ACCREDITED Registered Registered E Operation Manual CES E Giga tronics Page 1 User Manual 07503800 Model 3800 All technical data and specifications in this publication are subject to change without prior notice and do not represent a commitment on the part of Giga tronics Incorporated 2011 Giga tronics Incorporated All rights reserved Printed in the U S A Warranty Giga tronics Series 3000 Switching Modules are warranted against defective materials and workmanship for three years from date of shipment or as detailed in the warranty section of this manual Giga tronics will at its option repair or replace products that are proven defective during the warranty period This warranty DOES NOT cover damage resulting from improper use nor workmanship other than Giga tronics service There is no implied warranty of fitness for a particular purpose nor is Giga tronics liable for any consequential damages Specification and price change privileges are reserved by Giga tronics CONTACT INFORMATION Giga tronics Incorporated 4650 Norris Canyon Road San Ramon California 94583 Telephone 800 726 4442 only within the United States 925 328 4650 Fax 925 328 4700 On the Internet www gigatronics com Page 2 Operation Manual User Manual 07503800 Model 3800 Regulatory compliance information This product c
57. VDC range 330 mV VDC 300V Highest VDC range VAC 300mV First and lowest VAC range 330 mV VAC 300V Highest V AC range IAC 3mA First and lowest IAC range 3 3 mA IAC 300mA Highest IAC range IDC_3mA First and lowest IDC range is 3 3 mA IDC_300mA Highest IDC range OHM_2W_300 First 2 wire Ohms range is 330 Ohms OHM_2W_300K Fourth 2 wire Ohms range is 330 k OHM_2W_30MEG The highest 2 wire Ohms range is 33 MOhms OHM_4W_3K Second 4 wire Ohms range is 3 3 k OHM_4W_300K Fourth 4 wire Ohms range is 330 k Negative Value Error code Example if DMMGetFuncRange 0 VDC 300mV printf Lowest VDC range selected Page 114 Operation Manual User Manual 07503800 Model 3800 DMMGetFunction MODEL 1004 MODEL 1005 Description DMM function code int DMMGetFunction int Dmm Remarks This function returns the DMM function code Parameter nDmm Return Value Value VDC VAC IAC IDC OHMS2W OHMS4W DIODE TEMP LCL CAPS RTD VDC SRC VAC SRC IDC SRC LEAKAGE INDUCTANCE VDCSRC IDCSNS Negative Value Example if DMMGetFunction Type Description int Identifies the DMM DMMs are numbered starting with Zero Integer value corresponding to the current function or an error code Meaning Volts DC Volts AC AC current DC current 2 wire Ohms 4 wire Ohms Diode Characterization Local Board Temperature Capacitance Temperature with RTD VDC Source VAC Source IDC Source Leakage Induct
58. accuracy of the ACI function 1 If you have not done so install the MODEL 1004 and place the covers back on to the computer Ensure that the computer has been on for at least one half hour with the covers on before conducting this test 2 Remove all connections from the MODEL 1004 inputs Select the ACI function Autorange 3 Apply the following AC currents to the L4O amp terminals Check to see that the displayed reading on the SMX2040 is within the indicated readings range Table 9 8 AC Current Test All Inputs are at 400Hz 0 09588 mA 0 100412 mA 0 9948 mA 1 0052 ma 0 9684 mA 1 0316 mA 2 3 10 046 mA 10242 mA 100 44 ma 0 10465 A 1 0105 A Page 187 Operation Manual User Manual 07503800 Model 3800 6 8 Capacitance Test MODEL 1005 only The following procedure may be used to verify the accuracy of the Capacitance function 1 If you have not done so install the DMM and place the covers back on to the computer Ensure that the computer has been on for at least one half hour with the covers on before conducting this test 2 Connect DMM V O terminals to the calibrator HI amp LO Outputs Attach the test leads to the DMM leaving the other end open circuited Allow the DMM to settle for a few seconds and perform the Relative function This effectively nulls out the lead capacitance of your cabling 3 Apply the following Capacitance values to the V amp terminals Check t
59. ading rate and saves the last reading to the on board buffer This process repeats for iSamples No other DMM command should be issued to the DMM until it completes the operation and the buffer is read One exception is the DMMDisarmTrigger command which terminates the process No autoranging is allowed in this mode This function is usable for VDC VAC Ohms IAC IDC and RTD measurements Measurement rate should be set to 10rps or higher The total time it takes to complete this process is equal to iSamples iSettle 1 measurement rate Use the DMMReady to monitor if the has completed the operation and is ready When ready read up to iSamples using DMMReadBuffer or DMMReadBufferStr functions Once DMMReady returns TRUE it should not be used again until the buffer is read since it clears some flags in preparation for buffer reading when it detects a ready condition Parameter Type Description iDmm int Identifies the DMM DMMs are numbered starting with zero iSettle int The number of setteling measurements prior to read value Must be set between 0 and 250 Recommanded value is 4 iSamples int The number of samples the DMM takes following the same number of trigger pulses This number must be between 1 and 64 inclusive Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully terminated Negative Value Error code Example double Buffer 50 DMMBurstBuffRead 0 4 50
60. aking sensitive DC current measurements be sure to use the Relative function to zero out any residual errors of the MODEL 1004 This is easily accomplished by disconnecting all terminals to the DMM and performing Relative in the appropriate DCI range Using the S Cal DMMCalibrate prior to Relative will improve accuracy further Although the MODEL 1004 family is designed to withstand up to 2 5A indefinitely be aware that excessive Page 76 Operation Manual User Manual 07503800 Model 3800 heat may be generated when measuring higher AC or DC currents If allowed to rise this heat may adversely effect subseguent measurements In consideration with this effect it is recommended that whenever practical higher current measurements be limited to short time The lower two ranges of DC current are effected by relay contamination If the measurements seem high apply between 2mA and 5mA to the current terminals and alternate between the 3 3mA and 330mA ranges Repeat this for at least 100 times Best do this under program control with measurement rate set to 200rps This will clean the relay contacts from oxides and contaminants 4 2 2 Low Level DC Current Measurements For low level current measurements use the V Q and V Q terminals Using the 33V DCV range the MODEL 1004 can measure very low currents This hidden measurement function is facilitated by the DMM s low leakage front end and a virtual 10 0 input resistance With a typical of
61. al s peak to peak value int DMMReadPeakToPeak int nDmm double FAR pdResult Remarks This is a Secondary function and the DMM must be in ACV measurement function and a valid range must be set A double precision floating point peak to peak voltage result is stored in the location pointed to by IpdResult This measurement is a composite function which utilizes several sub functions and could take over 10 seconds to perform Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdResult double FAR Points to a double that holds the Peak to Peak value Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code Example double ptp int status DMMReadPeakToPeak 0 amp ptp Page 149 Operation Manual User Manual 07503800 Model 3800 DMMReadPeriod MODEL 1004 L MODEL 1005 Description Return the next double floating point period reading from the DMM int DMMReadPeriod int nDmm double FAR pdResult Remarks This is a Secondary function and the DMM must be in ACV measurement function and a valid range must be set It makes a single period measurement and stores the result as a double precision floating point number in the location pointed to by pdResult See DMMFrequencyStr for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zer
62. ance Source Voltage Measure Current Error code VDC printf VDC Function selected Page 115 Operation Manual User Manual 07503800 Model 3800 DMMGetGrdVer MODEL 1004 MODEL 1005 Description Get DMM firmware version int DMMGetGrdVer int nDmm Remarks This function returns the DMM firmware version of the on board controller Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value Integer value The return value is the version value or an error code Value Meaning Positive Value Version Negative Value Error code Example firmwarever DMMGetGrdVer 0 DMMGetHwVer MODEL 1004 MODEL 1005 Description Get the hardware version of the DMM int DMMGetHw Ver int nDmm Remarks This function returns the DMM hardware version A returned value of 0 corresponds to Rev 1 corresponds to Rev A 2 to Rev B etc Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value DMM hardware code or an error code Value Meaning Positive value Hardware version code Negative Value Error code Example int HWVer DMMGetHwVer 0 DMMGetID Page 116 Operation Manual User Manual 07503800 Model 3800 MODEL 1004 M MODEL 1005 M Description Get DMM ID code int DMMGetID int nDmm Remarks This function returns the DMM identification code Each DMM has a unique ID code that must match the calibration
63. ance of the test leads is nulled out The connection configuration for RTDs is identical to 4 wire Ohms 4 5 Internal Temperature MODEL 1005 A special on board temperature sensor allows monitoring of the DMM s internal temperature This provides the means to determine when to run the self calibration function S Cal for the DMM as well as predicting the performance of the DMM under different operating conditions When used properly this measurement can enhance Page 81 Operation Manual User Manual 07503800 Model 3800 the accuracy and stability of the DMM It also allows monitoring of the PC internal temperature which is important for checking other instruments in a PC based test system 4 6 Diode Characterization The Diode measurement function is used for characterizing semiconductor part types This function is designed to display a semiconductor device s forward or reverse voltage The DMM measures diode voltage at a selected current The available source currents for diode I V characterization include five DC current values 100 nA 1 pA 10 uA 100 uA and 1 mA The and MODEL 1005 have an additional 10 mA range The MODEL 1005 also has a variable current source which can be used concurrently with DCV measurement see Source Current Measure Voltage This allows a variable current from 10 nA to 12 5 mA The maximum diode voltage compliance is approximately4 V Applications include I V characteristics of Diodes LEDs Low v
64. and 10 mV add 100 additional error to the accuracy table below In many computer installations if the DMM is not near a noisy board usable voltage measurements of 1 mV can be obtained 2 Signal is limited to 8x10 Volt Hz Product For example the largest frequency input at 250 V is 32 kHz or 8x10 Volt x Hz Accuracy of reading Volts 1 24 hours 90 Days One Year 23 C 1 C 23 5 23 C 5 330 mV sa V 10 Hz 20 Hz 3 0 2mV 3 1 2 2 mV 3 2 2 5mV Page 44 Operation Manual User Manual 07503800 Model 3800 10 kHz 50 kHz 0 31 4 18 mV 0 33 21 mV 0 35 25 mV 50 kHz 100 kHz 2 0 30 mV 2 2 35 2 4 40 mV 250 V 10 Hz 20 Hz 3 0 140 mV 3 1 160 mV 3 3 200 mV m 47 Hz 10 kHz 0 06 10 mV 0 065 11 mV 0 073 13 mV ACV Noise Rejection Common Mode rejection for 50 Hz or 60 Hz with 1 imbalance in either lead is better than 60 dB Page 45 Operation Manual User Manual 07503800 Model 3800 2 3 2 AC Peak to Peak Measurement MODEL 1005 Measures the peak to peak value of a repetitive waveform Full Scale Resolution Typical Accuracy 23 C 5 C reading Vp g Vp p One Year 1 1 85 V 1 5 10 mV 1V 18 5 V 14470 mV 185 0 V 100 mV 1 0 700 mV soov liv 110 6 1 Specified from 30Hz to 10 kHz Input signal frequency of 30 Hz to 30 kHz 2 3 3 AC Crest Factor Measurement MODEL 1005 Measures the crest factor peak RMS of a repetitiv
65. are numbered starting with zero IpdDcy double FAR Points to the location which holds the duty cycle Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code Example double dcy int state state DMMReadDutyCycle 0 amp dcy Page 143 Operation Manual User Manual 07503800 Model 3800 DMMReadFreguency MODEL 1004 O MODEL 1005 Description Return the next double floating point freguency reading from the DMM int DMMReadFrequency int nDmm double FAR pdResult Remarks This function makes a single freguency measurement and stores the result as a 64 bit double precision floating point number in the location pointed to by pdResult For faster measurement select the frequency counter to a specific range using DMMSetCounterRng See DMMFrequencyStr for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdResult double FAR Points to a double that holds the frequency Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed DMM_E_INIT DMM is uninitialized Must be initialized prior to using any function DMM_E_DMM Invalid DMM number DMM_CNT_RNG Frequency counter is over or under range Example double d int status DMMReadFreguency 0 amp d Page 144 Operation Manual User Manual 07503800
66. as the same logical address as the DMM carrier printf This program works with the ASCOR 3801 3802 DMM carrier set to n logical address 2 n n n printf Initializing ASCOR DMM Initialize carrier as3801 init resourceName 1 1 amp Handle Initialize ASCOR DMM as1005 DMMInit Handle printf Initialized n Page 28 Operation Manual User Manual 07503800 Model 3800 Set auto range while exitProg i asl005 DMMSetAutoRange Handle 1 print n nSelection list n Type A and lt Enter gt to select AC Voltage mode n Type D and lt Enter gt to select DC Voltage mode n Type F and lt Enter gt to select Frequency mode n Type P and lt Enter gt to select Period mode n Type R and lt Enter gt to select 2 wire Resistance mode n Type O and Enter to quit the programlnin scanf s userInput functMode toupper userInput 0 if functMode lt lt A functMode lt lt D functMode lt lt F functMode lt lt P functMode lt lt R switch functMode case terminal and n terminal n n Voltage n go back to the selection list n programin amp readMeasurement volts n n readMeasurement case rar Set ASCOR DMM to AC Voltage mode asl005 DMMSetFunction Handle asl005 VAC printf nYou selected AC Voltage mode n Connection printf nConnection n
67. ating this limit may result in personal injury and or permanent damage to the DMM Example Assume a 30 resistor is in parallel with two resistors a 510 and a 220 which are connected in series with each other In a normal resistance measurement the 510 and 220 would swamp the measurement shunting most of the DMM Ohms source current By sensing the voltage at the top of the 30 and then applying this same voltage to the junction of the 510 and 220 there is no current flow through the shunting path With this guarding the MODEL 1005 accurately measures the 30 kO resistor Je i v Q Ra Eu 2504 sense LO 6V peak MAX 25A Max Figure 4 4 6 wire guarded in circuit ohms measurement configuration The current compliance of the Guard Force is limited to a maximum of 20 mA and is short circuit protected The resistor connected between the low of the 4 wire terminals and the guard point is the burden resistor or Ry Due to the limited guard source current this resistor can not be lower than Romin lo Rx 0 02 where I is the ohms source current for the selected range and R is the resistance being measured For example selecting the 330 range and measuring a 300 2 resistor imposes a limit on R of at least 15 O or greater Since the top burden resistor R does not have this limit imposed on it selecting the measurement polarity R can bec
68. ation Manual User Manual 07503800 Model 3800 DMMisinitialized MODEL 1004 MODEL 1005 Description Get the status of the DMM int DMMIsInitialized int n Dmm Remarks This function returns the status of the DMM If itis TRUE then the DMM has been initialized and is active If FALSE the DMM is not initialized and should not be addressed This function is used for maintenance and is not needed under normal operation Parameter nDmm Type Description int Identifies the DMM DMMs are numbered starting with zero Return Value TRUE FALSE or an error code Value TRUE FALSE DMM E DMM Example int active lt Meaning DMM is initialized and active DMM is not initialized Invalid DMM number DMMIsInitialzied 0 Page 131 Operation Manual User Manual 07503800 Model 3800 DMMISsRelative MODEL 1004 MODEL 1005 Description Get the status of the Relative flag int DMMIsRelative int nDmm Remarks This function returns the DMM Relative flag state Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value Integer TRUE FALSE or an error code Value Meaning TRUE Relative mode is selected FALSE Relative mode is not selected Negative Value Error code Example int rel DMMIsRelative 0 Page 132 Operation Manual User Manual 07503800 Model 3800 DMMLoadCalFile MODEL 1004 MODEL 1005 Description Reload calibration record f
69. ction printf Connection n printf Connect positive source of AC Voltage to ASCOR DMM V printf Connect negative source of AC Voltage to ASCOR DMM V modeMeas 1 while modeMeas printf Type and lt Enter gt to measure Type S and lt Enter gt to stop and Type Q and lt Enter gt to quit the scanf s userInput userChar toupper userInput 0 if userChar S amp amp userChar Q Read measurement asl005 DMMReadPeriod Handle printf The Period value is f else modeMeas 0 if userChar Q exitProg 1 break R Set ASCOR DMM to 2 wire Resistance mode asl005 DMMSetFunction Handle asl005 OHMS2W printf nYou selected 2 wire resistance mode n Connection printf Connection Mn Page 31 Operation Manual User Manual 07503800 Model 3800 DMM V terminal and n terminal Nnin resistance n go back to the selection list n program n amp readMeasurement Ohms n n readMeasurement printf Connect one end of the resistor to ASCOR printf Connect the other end of the resistor to ASCOR DMM V modeMeas 1 while modeMeas printf Type M and lt Enter gt to measure 2 wire Type S and lt Enter gt to stop and Type O and lt Enter gt to quit the scanf s userInput userChar toupper userInput 0 if userChar S amp amp userCha
70. ction contains important information concerning voltage and current limits Do not exceed these limits as personal injury or damage to the instrument your computer or application may result 5V peak MAX 25A Max 14WQ The DMM input connectors TRIG GUARD with Model 1005 only V Q This is the positive terminal for all Volts 2WQ capacitance diode and inductance measurements and for sourcing of VDC VAC and IDC It is also the Source HI for 4WQ measurements The maximum input across V 2 and V is 300 VDC or 250 VAC when in the measuring mode When in the sourcing mode the maximum input allowed before damage occurs is 100 volts V O This is the negative terminal for all Volts 2WQ capacitance diode and inductance measurements and or sourcing of VDC VAC and IDC It is also the Source LO for 4WQ Do not float this terminal or any other DMM terminal more than 300 VDC or 250 VAC above Earth Ground Also see Trig 6W Guard below I This is the positive terminal for all Current measurements It is also the Sense HI for 4WQ measurements 6WQ guarded measurements The maximum input across I 4WQ and I 4WQ is 2 5 A Do not apply more than 5 V peak across these two terminals Page 15 Operation Manual User Manual 07503800 Model 3800 I This is the negative terminal for all Current measurements In the Current modes it is protected with a 2 5 A 250 V Fast Blow fuse 5 x 20 mm It is al
71. ctivate the OpenCal button Sync With this check box selection is active the DMM measurements are internally synchronized which reduces the measurement rate but allows full scale input swings to be settled in single measurement Sources Panel There are three function buttons in the Source group MODEL 1005 only The V I LEAK buttons select one of three source functions Voltage DC and AC IDC and Leakage The Sources Panel is automatically enabled when one of the source functions is enabled It can also be invoked using the Sources Panel selection under the Tools menu This panel allows the entry of values for all of the source functions including Leakage he V OUT Scroll bar and Text box are used to set the oltage for DC and AC Volts as well as for Leakage When sourcing ACV the voltage is in RMS and the FREQ Scroll bar and Text box control the frequency of the source It is also LE piv Sources r Source Parameters rj 04800 V OUT rej 1000 FREQ OUT s 00 THRESH iri TrimDac used to control inductance freguency When sourcing DC current use the OUT set of controls When measuring iming or freqeuncy the THRESH set of controls is used for comperator threshold All of the source controls are context sensitive and will be enabled when appropriate mi Page 72 Operation Manual User Manual 07503800 Model 3800 4 0 DMM Operation and Measurement Tutor
72. cy 22 ppm DC Current Range 0 2 5 A Current Accuracy 0 008 AC Current Range 50 uA 2 5 A Current Accuracy 0 05 Capacitance Range 10 TF 10 mF Capacitance Accuracy 0 19 Page 179 Operation Manual User Manual 07503800 Model 3800 Page 180 Operation Manual User Manual 07503800 Model 3800 6 1 Performance Tests This test compares the performance of the MODEL 1004 with the specifications given in Section 2 The test is recommended as an acceptance test when the instrument is first received and as a verification after performing the calibration procedure To ensure proper performance the test must be performed with the MODEL 1004 installed in a personal computer with the covers on The ambient temperature must be between 18 C to 28 C Allow the MODEL 1004 to warm up at least one half hour before performing any of the tests The default reading rate of the MODEL 1004 should be used in each test 6 2 DC Voltage Test The following procedure may be used to verify the accuracy of the DCV function 1 If you have not done so install the MODEL 1004 and place the covers back on to the computer Ensure that the computer has been on for at least one half hour with the covers on before conducting this test 2 Apply a high quality copper wire short to the MODEL 1004 V Q amp inputs Select the DCV function Autorange Allow the MODEL 1004 to settle for several seconds and perform the Relative functio
73. d at very slow reading rates you may have to hold down the left mouse button longer than usual for the program to acknowledge the mouse click Page 67 Operation Manual User Manual 07503800 Model 3800 Note The soft front panel powers up in DCV 330 V range If the DMM is operated in Autorange with an open input you may hear the DMM relays clicking every few seconds as a range change occurs This is perfectly normal with ultra high impedance DMMs This phenomenon is caused by the virtually infinite input impedance of the 330 mV and 3 3 V DCV ranges On these ranges an open input will read whatever charge is associated with the signal conditioning of the DMM As this electrical charge changes the DMM will change ranges causing the relay clicking This is normal Page 68 Operation Manual User Manual 07503800 Model 3800 3 6 Using the Soft Front Panel ASCOR 3801 6 1 2 Digit DHH Panels Utilities Option Help f ASCOR 3801 INCORPORATED as1005 A Skga tonks Company Selftest am DN Addr Space A24 C A32 Auto Update WEGE vac PER 2w 4w TemP Range aum m ctive MF Slot LA Close Figure 3 2 The Soft Front Panel for the DMM The three main groups include Measure Source and Range buttons The 8 Range buttons are context sensitive such that only 330m 3 3 33 and 250 appear when in AC Voltage Functions 3 3m 33m 330m 2 5 appear when in Current F
74. d by a value of 2 3 of the top of each range Calibration of your MODEL 1004 is best performed using calibration software available from Ascor When using multiple DMMs in a single chassis the SM40CAL DAT file must have a calibration record for each DMM You can combine the unique calibration records of each DMM into one SM40CAL DAT file using any ASCII text editor Page 192 Operation Manual User Manual 07503800 Model 3800 7 0 Warranty and Service The DMM is warranted for a period of one year from date of purchase If your unit reguires repair or calibration contact your Ascor representative There are no user serviceable parts within the DMM Removal of any of the three external shields will invalidate your warranty For in warranty repairs you must obtain a return authorization from Ascor prior to returning your unit 8 0 Accessories Several accessories are available for the MODEL 1004 DMMs which can be purchased directly from Ascor or one of its distributors or representatives These include Basic DMM probes DMM probe kit Deluxe DMM probe set Page 193 Operation Manual User Manual 07503800 Model 3800 Page 194 Operation Manual
75. dge polarity of the trigger signal 1 for Positive or leading edge and 0 for negative or trailing edge trigger Return Value The return value is one of the following constants Value Meaning DMM OKAY Operation successfully terminated Negative Value Error code Example double Buffer 64 DMMSetBuffTrigRead 0 4 64 0 Negative edge 4 setteling readings and 64 samples triggers while DMMReady 0 wait for completion for i 0 lt 64 i read buffer j DMMReadBuffer 0 amp Buffer il Page 157 Operation Manual User Manual 07503800 Model 3800 DMMSetCapsMeasure MODEL 1004 O MODEL 1005 Description Tune the capacitance measurement function parameters for higher measurement speed int DMMSetCapsMeasure int nDmm int iAverage int iSamples Remarks This function should be used carefully since it modifies the capacitance function basic measurement parameters the averages value iAverage and the number of points sampled iSamples This function is provided only for cases where it is necessary to improve measurement speed When using this function keep in mind that the accuracy specification provided for capacitance is not guaranteed Also modifying these values could have profound effect on the operation of the function Any time a capacitance range is changed these values are set to the default values For instance values of 1 and 3 for iAverage and iSamples will reduce measurement time on the 1
76. e 151 Operation Manual User Manual 07503800 Model 3800 DMMReadTotalizer MODEL 1004 L MODEL 1005 Description Read the totalized value accumulated by the Totalizer function long DMMReadTotalizer int nDmm Remarks This function reads the total value accumulated by the Totalizer function For details see DMMsStartTotalize Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value The return value is the totalized count or if negative one of the following constants Value Meaning Negative Value Error code Example long total DMMReadTotalizer 0 Page 152 Operation Manual User Manual 07503800 Model 3800 DMMReadWidth MODEL 1004 O MODEL 1005 M Description Return the positive and negative pulse widths int DMMReadWidth int nDmm double FAR pdPwid double FAR pdNwid Remarks This is a Secondary function and the DMM must be in ACV measurement function and a valid range must be set It returns two parameters positive and negative pulse widths These parameters are stored as double precision floating point numbers in the location pointed to by pdPwid and lpdNwid The measured widths are affected by the setting of the Threshold DAC Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdPwid double FAR Points to a double that holds the positive width lpdNwid double FAR Points to a double that holds
77. e Test 2 wire Minimum Reading Maximum Reading 1 330 1 9 9972 Q 10 0028 Q 330 0 100 99 987 100 013 Q 33 kO 0 999917 kQ 1 000083 2 3 33 kQ 10kQ 9 99905 10 00095 kQ 5 Is 330 kO 100 kQ 99 986 KQ 100 014 kO 6 0 99942 1 00058 MO 33 MQ 10 MQ 9 973 MQ 10 027 MQ lg 330 MQ 1 100 MQ 97 92 MQ 102 08 MQ 1 MODEL 1005 only 6 4 Resistance Test 4 wire The following procedure may be used to verify the accuracy of the 4 wire function 1 If you have not done so install the MODEL 1004 and place the covers back on to the computer Ensure that the computer has been on for at least one half hour with the covers on before conducting this test Page 182 Operation Manual User Manual 07503800 Model 3800 2 Connect the MODEL 1004 V Q amp terminals to the calibrator HI amp LO Output Connect the MODEL 1004 I 4WO terminals to the HI amp LO Sense terminals 3 Select the 4WQ function on the MODEL 1004 Autorange Set the calibrator to 0 Be certain that the calibrator is set to external sense EX SNS on the Fluke 5700A or 4 Wire Comp on the 5520A Allow the MODEL 1004 to settle for a few seconds and perform the Relative function 4 Apply the following Resistance values to the V Q amp terminals Check to see that the displayed reading on the MODEL 1004 is within the indicated range Table 9 4 Resistance Test 4 wire Minimum Reading Maximum Readi
78. e control software Use DMMSetTrimDAC command with a parameter of 0 to 100 Further details are in Chapter 6 Page 89 Operation Manual User Manual 07503800 Model 3800 4 12 4 Source Current Measure Voltage When sourcing current and measuring voltage there are two connection configurations 1 Four wire connection where the current sourcing terminals and the voltage sense terminals are connected to the load as in 4 wire Ohms measurement function and 2 Two wire connection where the current source terminals also serve as voltage sense probes as in the 2 wire Ohms measurement configuration The first method eliminates lead resistance errors One application is in semiconductor diode characterization discussed in Component Testing above See Current Source Output for range details Voltage compliance is limited to 4 V in both configurations DCI Source DCV Measure 25 25A wx l4WO TRIG GUARD Trig eW GUARD Figure 4 12 Sourcing DC current and measuring voltage in the two wire configuration This function can be used for semiconductor parametric tests 4 12 5 Source Voltage Measure Current To source DC Voltage while measuring the current through a load connect an external shunt resistor as described in Figure 4 6 The details in section 4 3 4 for Leakage measurements are also applicable to Sourcing Voltage and Measuring Current operations Page 90 Operation Manual User
79. e software operation that takes a few seconds It can be performed by calling Windows command DMMCal or selecting S Cal in the control panel All three products are capable of continuous measurement as well as data transfer rates of up to 1 000 readings per second rps To achieve the 6 1 2 digit resolution the DMM should be operated at 5 rps or slower The maximum reading rate for 5 1 2 digits is 30 rps Accuracy vs Reading Rates All of the above specifications apply to reading rates of 2 rps or lower For higher reading rates increase the noise floor for DCV Resistance and DCI by the square root of the increase in reading rate from 2 rps For example the noise floor for the 3 3 VDC range is 8 uV at 5 rps At 20 readings per second or 10x the reading rate the noise increases by the square root of 10 or 3 16 times The noise then at 20 readings per second is 25 The noise characteristics for the AC functions increases by the same number as the DC functions For example the noise floor for the 3 3 VAC 20 rps will have digit rattle of 8 7 mV vs 2 75 mV at 2 rps Reading Rates vs Noise Rejection The best AC 50 Hz 60 Hz or 400 Hz power line rejection is obtained at reading rates that are whole number divisions greater than 1 of the line frequency as shown in the following table For best AC line rejection you should use the reading rates checked It is important to follow this table Always use the lowest checked rate that is
80. e waveform ACV Lowest specified Highest specified input Resolution Typical Accuracy 23 5 C Range input voltage voltages Vp p One Year 1 Vp p 330 mV 22403 21401 iso v 20204 250 V 100 V 700 V 2 0 30 1 1 Crest factor measurement requires signal frequency of 30 Hz to 30 kHz 2 3 4 AC Median Value Measurement MODEL 1005 Measures the mid point between the positive and negative peaks of a repetitive waveform Used to determine the Threshold DAC setting for optimal frequency and timing measurements ACV Lowest specified input Full Scale Resolution Typical Accuracy 23 C 5 C One Year 1 Range voltage Vp p reading 1 mV 330mV 0 08V 0 95 V 2 0 17 mV 3 3 V 0 80 V 49 5 V 10 mV 3 160 mV Page 46 Operation Manual User Manual 07503800 Model 3800 33 V 8V 95 0 V 100 mV 3 1 4 V 250 V 80 V 350 0 V 1V 3 12 V 1 Median measurements require a repetitive signal with frequency range of 30 Hz to 30 KHz Page 47 Operation Manual User Manual 07503800 Model 3800 2 4 AC Current Measurement True RMS Input Characteristics Burden Voltage lt 350 mV RMS all Ranges Crest Factor 3 at Full Scale increasing to 7 at Lowest Specified Current Protected with 2 5 A fuse 5x20 mm 250 V Fast Full Scale 6 1 2 Digits Lowest Specified Current 3 300000 ma 50 pA nA 33 00000 ma za 330 mA 330 0000 mA sa oo o o o mA lion nA 2500000 A Accuracy of reading Amp
81. eading mode If FALSE the DMM will change to absolute reading mode Caution Do not select DMMSetRelative when in the autorange mode Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero bRelative BOOL TRUE to enter relative mode FALSE to clear mode Return Value The return value is one of the following constants Value Meaning DMM_OKAY DMM mode changed successfully Negative Value Error code Example status DMMSetRelative 0 TRUE Page 168 Operation Manual User Manual 07503800 Model 3800 DMMSetRTD MODEL 1004 O MODEL 1005 Description Set RTD parameters int DUMSetRTD int nDmm int iWires double FAR dRo Remarks This Secondary function sets the RTD parameters The DMM must be in RTD measurement function for this function to execute properly iWires selects between 3 wire and 4 wire RTD 3 wire RTDs are not implemented in this version of software dRo sets the RTD R Ice point resistance This function must follow the selection of the basic RTD type using DMMSetRange since it modifies the default R parameter for the selected RTD Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iWires int RTD s number of connecting wires RTD 4 W or RTD 3 W IdRo double FAR R resistance See specs for allowed range for each RTD type Return Value Integer error code Value Meaning DMM OKAY Operation successfully com
82. eadings which are saved on board at the current DMM measurement function range and rate The reading rate must be set to 10 rps or higher You can abort this mode by sending the DMM a Disarm command to the Analog Trigger 4 10 3 Software Issued Triggered Operations There are several software trigger functions They can commend the to make a predefined number of readings with a specified number of settling readings These include DMMSetBuffTrigRead DMMsSetTrigRead DMMTrigger DMMBurstRead and DMMBurstBuffRead Read about these functions in the Windows Command Language section 5 6 for details 4 11 Frequency and Timing Measurements MODEL 1005 While the maximum RMS reading is limited to the set range you can use most of the timing functions even if the RMS voltage reading indicates overrange This is true as long as the input peak to peak value does not exceed 5 75 times the selected range 5 75 x 330 mV 1 9 V p p with the 330 mV range 4 11 1 Threshold DAC All timing measurements utilize the AC Voltage path which is AC coupled You need to select the appropriate ACV range prior to using the various frequency and timing measurement functions The and MODEL 1005 have a novel feature to accurately make these measurements for all waveforms Unlike symmetrical waveforms such as a sine wave and square wave non symmetrical waves may produce a non zero DC average at the frequency counter s comparator input Other DMMs have the comparator
83. ements For better accuracy it should be performed more frequently The Open Terminal calibration should be performed with the test leads open The DMMOpenTerminalCal sweeps the inductance stimulus source across the full bandwidth and makes measurements at several points It takes about twenty seconds to complete the process For a complete characterization of the Inductance measurement system it is also necessary to perform the inductance zero operation with the inductance range and frequency selected using the Relative function and with the probes shorted Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example int status DMMOpenTerminalCal 0 Page 134 Operation Manual User Manual 07503800 Model 3800 DMMPeriodStr MODEL 1004 L MODEL 1005 Description Return the next DMM period reading formatted for printing int DMMPeriodStr int nDmm LPSTR IpszReading Remarks This function makes a period measurement and returns the result as a string formatted for printing The print format is fixed to five digits plus a unit e g 150 01 ms See DMMFrequencyStr for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszReading LPSTR Points to a buffer at least 64 characters long to hold the converted re
84. er userInput 0 if userChar S amp amp userChar 0 1 Read measurement asl005 DMMReadNorm Handle printf The DC Voltage value is f elsef modeMeas 0 if userChar Q exitProg 1 break Er Set ASCOR DMM to Frequency mode uda asl005 DMMSetFunction Handle asl005 FREQ printf nYou selected Frequency mode n Connection printf Connection n printf Connect positive source of AC Voltage to ASCOR DMM V printf Connect negative source of AC Voltage to ASCOR DMM V modeMeas 1 while modeMeas 1 printf Type M and lt Enter gt to measure Type S and lt Enter gt to stop and Type O and lt Enter gt to guit the scanf s userInput userChar toupper userInput 0 if userChar S amp amp userChar Q Page 30 Operation Manual User Manual 07503800 Model 3800 amp readMeasurement Hz n n readMeasurement case terminal and n terminal n n Period n go back to the selection list n program n amp readMeasurement seconds n n readMeasurement case Read measurement asl005 DMMReadFrequency Handle printf The Frequency value is f elsef modeMeas 0 if userChar vo exitProg lt 1 break pos Set ASCOR DMM to Period mode as1005 DMMSetFunction Handle asl005 PER printf selected Period mode n Conne
85. es 3 3mA 33mA 330mA 2 5A Accuracy is better than 0 1 AC VOLTS RMS 4 ranges 330mV 3 3V 33V 250V Accuracy is better than 0 996 20 Hz to 50 KHz AC CURRENT RMS 4 ranges 3 3mA 33mA 330mA 2 5A Accuracy is better than 0 996 20 Hz to 50 KHz RESISTANCE TWO WIRE 5 ranges 3300 3 3 33 KO 330 KO 3 3MO Accuracy is better than 0 00396 RESISTANCE FOUR WIRE 4 ranges 3300 3 3 KO 33 KO 330 KO Accuracy is better than 0 00396 Page 12 Operation Manual User Manual 07503800 Model 3800 MODEL 3801 1005 or MODEL 3802 1005 DC VOLTS 4 ranges 330mV 3 3V 33V 330V Accuracy is better than 0 004 DC CURRENT 4 ranges 3 3mA 33mA 330mA 2 5A Accuracy is better than 0 1 AC VOLTS RMS 4 ranges 330mV 3 3V 33V 250V Accuracy is better than 0 9 20 Hz to 50KHz AC CURRENT RMS 4 ranges 3 3mA 33mA 330mA 2 5A Accuracy is better than 0 9 20 Hz to 50KHz RESISTANCE TWO WIRE 8 ranges 330 3300 3 3 KO 33 KO 330 KO 3 3 MO 33 MQ 330 Accuracy is better than 0 003 RESISTANCE FOUR WIRE 8 ranges 330 3300 3 3 KO 33 KO 330 KO 3 3 MO 33 MQ 330 Accuracy is better than 0 003 RESISTANCE SIX WIRE GUARDED 5 ranges 330 3300 3 3 KO 33 KO 330 KQ Accuracy is better than 0 03 TEMPERATURE Range is 150 degrees C to 650 degrees C Accuracy and Range depend on RTD Type
86. es a function called autoConnectToAll This function makes connection to all the ASCOR 3801 instruments automatically and resets these instruments as well Since this function will reset all ASCOR 3801 instruments the user should use it only one if he she does not want to reset all ASCOR 3801 instruments again TROUBLESHOOTING Problem Project link error Undefined symbol as1005 dmmInit referenced in xxx c is your c file Cause User used the old as1005 1ib which does not have function as1005 dmmInit when linking to xxx c Solution Make sure all library files asl005 lib and as3801 32 lib are up to date The latest library files as1005 1ib and as3801 32 1lib are located in C Vxipnp Win95 Lib yyyy folder after ASCOR 3801 3802 VXIplug amp play Instrument driver is installed yyyy the library folder which is suitable for the user compiler Problem DMM Uninitialized error appears when attempting to load as3801 Front Panel Cause as3801 Soft Front Panel does not see DMM Solution Run Resman Problem Fail W R to Comm Controller error appears when attempting to load as3801 Front Panel Cause Fail to Write Read to from DMM Solution Turn on chassis with DMM inside and let it runs 2 minutes for warming up Run Resman and then run as3801 Front Panel Problem Over Range error appears when attempting to measure Cause The source for measurement is out of range from the range t
87. es the DMM DMMs are numbered starting with zero IpdRate double FAR Pointer to double where the rate is to be saved Return Value Integer error code Value Negative Value Example int status status DMMGetRate 0 Meaning Error code double FAR rate amp rate Page 124 Operation Manual User Manual 07503800 Model 3800 DMMGetsSlot MODEL 1004 MODEL 1005 Description Get the slot number where DMM is plugged in int DMMGetSlot int nDmm Remarks This function returns the slot number of the V XI chassis where the DMM is located Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value DMM slot number or error code Value Meaning Positive value Slot number Negative Value Error code Example int DMMOSlot DMMGetSlot 0 Page 125 Operation Manual User Manual 07503800 Model 3800 DMMGetSourceFreg MODEL 1004 O MODEL 1005 Description Get the currently set ACV Source freguency int DMMGetSourceFreq int nDmm double FAR pdFreq Remarks This function returns a double floating value that is the currently set ACV source freguency of the MODEL 1005 It can be used to display or verify the default frequency of the stimulus for the various Inductance measurement ranges Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdFreq double FAR Pointer where the frequency value is to be saved
88. eserved for the resource manager However the Module fully supports Dynamic Configuration as defined in Section F of the VXI specification address 255 FF should be selected only if the Resource Manager also supports Dynamic Configuration 4 2 LEDs The following LEDs are visible at the Module s front panel to indicate the status of the module s operation 4 2 1 BUS LED This green color LED is normally off and will flash on when the module is addressed by the system 4 2 2 PWR LED This red color LED is normally on when the Module is Powered up Page 10 Operation Manual User Manual 07503800 Model 3800 Chapter 5 Internal Settings The following items are inside the module and can be reached by removing the side cover 5 1 Fuse The ASCOR VXI 38xx uses a 10 Amp fuse in the 45 Volt line and is located on the Mother Board MB assembly 5 2 VXIbus Interrupt Level Selection The VXIbus interrupt level is set with three bits in the 3Eh register See the section on A16 ADDRESS SPACE REGISTER DESCRIPTION The interrupt level is factory set to no interrupt Page 11 Operation Manual User Manual 07503800 Model 3800 Chapter 6 Specifications MODEL 3801 1004 or MODEL 3802 1004 more detailed specifications are found in Chapter 11 DC VOLTS 4 ranges 330mV 3 3V 33V 330V Accuracy is better than 0 004 DC CURRENT 4 rang
89. est to the body of the resistor See Figure 4 3 4 wire Ohm makes very repeatable low ohms measurements from 100 10 uQ for MODEL 1005 to 330 We do not recommend using 4WQ when making measurements above 100 although 4 wire ohms is allowed up to 330 4 wire measurements are disabled above 330 since the extra set of leads can actually degrade the accuracy due to additional leakage and noise paths sense LAWO TRIG GUARD Trig SW 2 GUARD Figure 4 3 The l and I sense leads should be closest to the body of the resistor when making 4WQ measurements 4 3 3 6 wire Guarded Resistance Measurement MODEL 1005 Page 78 Operation Manual User Manual 07503800 Model 3800 The MODEL 1005 provides a guarded 6 wire resistance measurement method It is used to make resistance measurements when the resistor under test has other shunting paths which can cause inaccurate readings This method isolates the resistor under test by maintaining a guard voltage at a user defined node The guard voltage prevents the shunting of the DMM Ohms source current from the resistor under test to other components The Guard Source and Guard Sense terminals are provided at pins 1 and 6 of the DIN connector respectively Warning The DIN connector pins are only protected to a maximum of 35 V with respect to the PC chassis or any other DMM terminal Do not apply any voltages greater than 35 V to the DIN connector pins Viol
90. etect the new DMM and prompt you for a driver the driver your computer requires is located on the USB FLASH drive AS3801folder 1_0_4 SETUP EXE To install the software run the SETUP program provided on the USB FLASH drive This takes care of all installation and registration requirements of the software If you are installing the DMM on a computer that had a previous version of the software you should first uninstall the old software Also make sure you backup and remove the old calibration record SM40CAL DAT 3 3 Installing the 38XX VXI Module Follow the instructions in the Section 3 of this manual entitled Installing your VXI Module Page 63 Operation Manual User Manual 07503800 Model 3800 Section 3 0 and 3 2 updated to reflect USB FLASH instead of FLOPPY DISK Page 64 Operation Manual User Manual 07503800 Model 3800 3 4 DMM Input Connectors Before using the DMM please take a few moments and review this section to understand where the voltage current or resistance and other inputs and outputs should be applied This section contains important information concerning voltage and current limits Do not exceed these limits as personal injury or damage to the instrument your computer or application may result Figure 3 1 The DMM input connectors This is the positive terminal for all Volts 2WQ capacitance diode and inductance measurements and for sourcing of VDC VAC and IDC It i
91. eter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iTempUnits int Temperature units can be either DEG F for F or DEG C for C The default is C Return Value The return value is one of the following constants Value Meaning DMM OKAY Function succeeded Negative Value Error code Example int status DMMSetTempUnits 0 DEG F set units to F Page 172 Operation Manual User Manual 07503800 Model 3800 DMMSetTrigRead MODEL 1004 MODEL 1005 Description Setup the DMM for mutiple Triggered readings operation int DMMSetTrigRead int nDmm int iSettle int iSamples int iEdge Remarks Setup the DMM for external hardware trigger operation Following reception of this command the DMM enters a wait state After reception of an external trigger edge of iEdge polarity the DMM takes iSettle 1 readings at the set measurement function range and reading rate and sends the last reading This process is repeated for iSamples times iSamples Trigger pulses must be issued to complete this process No autoranging is allowed in this mode The number of trigger edges must be equal or greater than iSamples to properly terminate this mode Following the issue of the DMMSetTrigRead command and until the sampling process ends it is necessary to read the samples from the DMM using the DMMReadMeasurement command This will prevent an Overrun communication error In other words the rate at which mea
92. f up to 10 may be accumulated The maximum rate of accumulation is 30 000 events per second The Threshold DAC can be set for a negative or positive voltage value See Threshold DAC above for more details Example One To monitor and capture the AC line for positive spikes which exceed 10 of the nominal 120 V RMS value first select ACV 250 V range than set the Threshold DAC to 186 7 V This value is the peak value of 120 V RMS plus 10 120V 10 X 42 Enable the Totalizer and read it periodically to get the number of times this value was exceeded Example Two Defects in coils inductors or transformers can be manifested as an increased decay or greatly attenuated resonance when stimulated with a charged capacitor The Totalizer function can be utilized to count transitions above a preset Threshold voltage as in the figure below Totalizer count 11 Threshold DAC 11 11 11 18 ER OV Figure 4 9 Measuring inductor Q by counting transitions of decaying resonance with preset threshold 4 12 Sourcing Functions MODEL 1005 The MODEL 1005 adds a number of sourcing functions giving greater versatility for a variety of applications All of the available sources VDC VAC IDC are isolated floating with respect to the PC chassis This allows Page 87 Operation Manual User Manual 07503800 Model 3800 sourcing with a significant common mode voltage as well as the ability to connect several MODEL 1005 units in parallel
93. fer at least 64 characters long to hold the cal date string Return Value The return value is one of the following constants Value Meaning any positive number Length of the date string Negative number Error code Example char cBuf 64 int status status DMMGetCalDate 0 cBuf Page 109 Operation Manual User Manual 07503800 Model 3800 DMMGetdB MODEL 1004 Zl MODEL 1005 M Description Get dB deviation from the reading at the time relative was activated int DMMGetdB int nDmm double FAR pdDev Remarks This function returns a double floating value that is the dB deviation relative to the reading made just before the relative function was activated This function is useful in determining measurement errors in dB It can be used for bandwidth measurements or DC evaluation Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdDev double FAR Pointer where the dB value is to be saved Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example double FAR dB int status DMMGetdB 0 amp dB Page 110 Operation Manual User Manual 07503800 Model 3800 DMMGetdBStr MODEL 1004 MODEL 1005 Description Get dB deviation from the reading at the time relative was activated int DMMGetdBStr int nDmm LPCSTR pszDB Remarks This function is the same as the DMMGetdBo with the exception that
94. for internal gain scale factor and zero errors The DMM does this by alternatively selecting its local DC reference and a zero input It is required at least once every day to meet the MODEL 1004 accuracy specifications We recommend that you also perform this function whenever the external environment changes e g the temperature in your work environment changes by more than 5 C or the MODEL 1005 on board temperature sensor indicates more than a 5 C change This function takes less than a few seconds to perform Disconnect all leads to the DMM before doing this operation Keep in mind that this is not a substitute for periodic calibration which must be performed with external standards Page 71 Operation Manual User Manual 07503800 Model 3800 ClosedLoop This check box selection is used in conjunction with the AC and DC Voltage Source functions of the MODEL 1005 When checked the DMM monitors the output level and continuously applies corrections to the output level When not checked the DMM is a 12 bit source vs 16 bits in the ClosedLoop mode OpenCal This check box selection is used in conjunction with inductance measurement It is necessary to perform Open Terminal Calibration using this control prior to measuring inductance This function characterizes both the internal DMM circuitry as well as the probe cables To perform OpenCal attach the probe cables to the DMM leaving the other end of the probe cables open circuited Then a
95. fset error of less than 100uV in this VDC range it is practical to measure down to 20pA The maximum current value that can be measured has more to do with the user s acceptable burden voltage the voltage drop across the 10 0MQ shunt then the DMM limitations Assuming a maximum burden voltage of 3 3V the maximum current level is 330nA This rage is well within leakage measurements required in semiconductor testing It is also a very quite and stable Since the DMM does not have an explicit low current function it is necessary to calculate the current It is equal to the measured voltage divided by 10 0MQ 4 3 Resistance Measurements Resistance is measured with one of seven six in the MODEL 1004 precision current sources with the DMM displaying the resistance value Most measurements can be made in the 2 wire mode The 4 wire ohms is used to make low value resistance measurements 4 3 1 2 wire Ohm Measurements Measures from 100 nO to 33 MO 10 uQ to 330 MQ in the MODEL 1005 Use the V Q V Q terminals being certain to always disconnect the I I terminals Most resistance measurements can be made using the simple 2 wire Ohms method Simply connect V Q to one end of the resistor and the V Q to the other end If the resistor to be measured is less than 30 kQ you should null out any lead resistance errors by first touching the V Q and V O test leads together and then performing a Relative function If making measurements above 300 kO
96. g the Threshold DAC to the Median value the internal measuring circuits are properly biased for best performance Page 85 Operation Manual User Manual 07503800 Model 3800 AC Amplifier Attenuator Comp Comparator Threshold DAC V threshold Y threshold Input Comp Figure 4 8 Comparator and Threshold DAC Settings 4 11 2 Frequency and Period Measurements Both Freq and Per check boxes are only visible when ACV or ACI functions are selected These check boxes are used to make frequency or period measurements Freq measures from 1 Hz to 300 kHz When activated the control panel alternately updates the amplitude reading followed by the frequency reading The reading rate is slower than indicated when frequency is activated In the Windows control panel period Per is also selectable Once the frequency range is acquired Frequency and Period have a maximum measurement time of about 1 second It could take up to five measurements before the correct frequency range is auto selected This process is automatic Once within range the next frequency measurement is made at the last selected range Both Frequency and Period measurement performance can be improved by properly setting the Threshold DAC a novel feature of the and MODEL 1005 See Threshold DAC AC Median Value and Peak to Peak measurements for further details 4 11 3 Duty Cycle Measurement Duty Cycle of signals from 1 Hz to 100 kHz can be meas
97. h zero Return Value The return value is one of the following constants Value Meaning DMM_OKAY DMM is OK Negative Value Error Example status DMMCalibrate 0 a quick internal cal Comments This performs an internal DMM calibration and is the same as the S Cal command in the VB Control Panel It is not related to the external calibration represented in the SM40CAL DAT file Page 102 Operation Manual User Manual 07503800 Model 3800 DMMClearMinMax MODEL 1004 MODEL 1005 M Description Clears the Min Max storage int DMMGetMin int nDmm Remarks This function clears the Min Max values and initiates a new Min Max accumulation See DMMGetMin for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example int status DMMClearMinMax 0 Page 103 Operation Manual User Manual 07503800 Model 3800 DMMDelay MODEL 1004 Zl MODEL 1005 M Description Wait for a given time int DMMDelay double dTime Remarks seconds Return Value Delay of dTime seconds dTime must be a positive double number between 0 0 and 100 0 Parameter Type Description dTime double Delay time in seconds The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully terminated Negative Value Error code Exa
98. hard wired to the zero crossing The and MODEL 1005 include a bipolar variable Threshold DAC for improved performance of these measurements The Threshold DAC allows the internal timing comparator to trigger at a specific DC level Functions affected by the Threshold DAC include frequency period pulse width duty cycle and the totalizer The Threshold DAC has 12 bits of resolution Depending on the selected ACV range this bipolar DAC can be set from a few mV to effectively several hundred volts referred to the input of the DMM positive or negative See the Specifications sections for the limits of AC Median Value measurements and Threshold DAC settings The best setting of the Threshold DAC is based on the AC Median Value and Peak to Peak measurement described earlier For example a 5 V logic signal with 10 duty cycle will result in median value of 2 V whereas a 90 duty cycle signal will have a 2 V median value Setting the Threshold DAC to the appropriate median value will result in reliable and accurate timing measurements in each case Page 84 Operation Manual User Manual 07503800 Model 3800 10 DCY Comperator Threshold DAC V threshold Figure 4 6 AC coupled timing measurements with Threshold DAC With the 3 3 ACV range selected a 10 duty cycle square wave with 5 V peak to peak value presents a peak to peak signal at the internal measuring circuits of 0 5 V to 4 5 V The AC Median Value is 2 0 V By settin
99. he DMM DMMs are numbered starting with zero Meaning Operation successfully completed Error code Page 106 Operation Manual User Manual 07503800 Model 3800 DMMDutyCycleStr MODEL 1004 O MODEL 1005 Description Return percent duty cycle of an AC signal in string format int DMMDutyCycleStr int nDmm LPSTR IpszReading Remarks This function is the string version of DMMReadDutyCycle The measurement result is stored at the location pointed to by pszReading See DMMReadDutyCycle for more details Return Value Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszReading LPSTR Points to a buffer at least 64 characters long to hold the result The return value is one of the following constants Value Meaning DMM_OKAY Valid return Negative Value Error code Example char cBuf 64 int status DMMDutyCycleStr 0 cBuf Page 107 Operation Manual User Manual 07503800 Model 3800 DMMFrequencySir MODEL 1004 O MODEL 1005 Description Return the next DMM freguency reading formatted for printing int DMMFrequencyStr int nDmm LPSTR pszReading Remarks This function makes freguency measurement and returns the result as a string formatted for printing The print format is fixed to six digits plus units e g 05 001 Hz If the DMM is in autorange be certain to take an amplitude reading before using this command It may take several calls to DMM
100. he user sets Solution Select appropriate range or set autoRange on CONTACT INFORMATION If you have any questions comments or suggestions we can be reached at the addresses below Web site www ascor inc com E mail info ascor inc com Page 24 Operation Manual User Manual 07503800 Model 3800 Postal mail ASCOR Inc 4384 Enterprise Place Fremont CA 94538 USA Voice 510 490 2300 Fax 510 490 8493 Page 25 Operation Manual User Manual 07503800 Model 3800 Chapter 10 SAMPLE PROGRAMS The following two sample programs are examples of how to program the 38XX DMM The examples are the actual source code written in C DC VOLTAGE MEASUREMENT PROGRAM This program shows how to make a DC Volts measurement MEASURE BASIC MODES ON THE ASCOR DMM This program interrogates the basic modes of the DMM such as AC DC Voltage Freguency Period Resistance etc 10 1 Sample Dc Voltage Measurement Program x a Sample DC Voltage Measurement Program fe Copyright 2003 ASCOR Inc a Program Revision 1 0 0 e Modification History E Include files include lt stdio h gt include lt ctype h gt include include asl005 h include include as3801 h ViSession Handle This program works if the resourceName and the DMM carrier have the same logical address Set the log
101. ial Most of the DMM measurement functions are accessible from the Soft Front Panel Figure above All of the functions are included in the Windows DLL driver library To gain familiarity with the DMM run the Windows SETUP EXE to install the software then run the DMM as described in the previous section This section describes in detail the DMM s operation and measurement practices for best performance 4 1 Voltage Measurement Measures from 0 1 uV to 300 VDC or 250 VAC Use the V and terminals being certain to always leave the I I and DIN 7 terminals disconnected Use the AC DC button on the Control Panel to switch between AC and DC Making Voltage Measurements is straightforward The following tips will allow you to make the most accurate voltage measurements 4 1 1 DC Voltage Measurements When making very low level DCV measurements lt 100 uV you should first short the DMM with a copper wire shorting plug across the V and V terminals and perform the Relative function to eliminate zero errors before making your measurements A common source of error can come from your test leads which can introduce several Volts of error due to thermal voltages To minimize thermal voltaic effects after handling the test leads you should wait a few seconds before making measurements Ascor offers several high quality probes that are optimal for low level measurements Note The DMM front panel powers up in DCV 330
102. iates reading s into the onboard buffer and the 6W guard signals facilitate in circuit resistor measurements by means of isolating a loading node The DIN 7 plug can be ordered from Ascor and is also available at many electronic hardware distributors The connector is generically referred to as a mini DIN 7 male The trigger signal should be in the range of 3 V to 12 V peak The two 6W guard signals should never have more than 5 V peak across them Warning The DIN connector pins are protected to a maximum of 35 V with respect to the PC chassis and any other DMM terminal Do not apply any voltages greater than 35 V to the DIN connector pins Violating this limit may result in personal injury and or permanent damage to the DMM 6 Gare Sense MODEL 1005 DIN 7 Connector Pin Description view from bracket side 3 5 Starting the Soft Front Panel You can verify the installation and gain familiarity with the DMM by exercising its measurement functions using the VXI Plug amp Play Soft Front Panel SFP To run the SFP at the Windows Interface click on START then click on PROGRAMS then click on VXIPNP then click on as3801 Front Panel If you do not hear the relays click it is most likely due to an installation error Another possible source for an error is that the SM40CAL DAT file does not correspond to the installed DMM The SFP is operated with a mouse All functions are accessed using the left mouse button When the DMM is operate
103. iation 0 error Page 112 Operation Manual User Manual 07503800 Model 3800 DMMGetDeviatStr MODEL 1004 MODEL 1005 Description Get percent deviation from the reading at the time relative was activated int DMMGetDeviatStr int nDmm LPCSTR pszDev Remarks This function is the same as the DMMGetDeviation with the exception that it returns a string See DMMGetDeviation for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszDev LPCSTR Points to a buffer at least 64 characters long to hold the result The return value will consist of a leading sign a floating point and a unit specifier Return Value Integer string length if successful or an error code Value Meaning Negative Value Error code Example char cBuf 64 int strLength lt DMMGetDeviatStr 0 cBuf Page 113 Operation Manual User Manual 07503800 Model 3800 DMMGetFuncRange MODEL 1004 MODEL 1005 Description Get DMM range code int DMMGetFuncRange int nDmm Remarks This function returns the combined DMM function range code See UserDMM h for the complete set of codes Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value Integer value corresponding to the currently set DMM function range or an error code The following are a few examples of the returned value Value Meaning VDC 300mV First and lowest
104. ical address in the resourceName to reflect the setting on the DMM carrier ViRsrc resourceName ysis instr vxi logical address instr int main int argc char argv double valueVDC char userInput 100 int getVDC printf AnCopyright C 2003 ASCOR Inc n Page 26 Operation Manual User Manual 07503800 Model 3800 printf Program Revision 1 0 0 n n printf This is a sample program to measure DC Voltage on ASCOR DMM 1004 1005 n This program works if the resourceName has the same logical address as the DMM carrier printf This program works with the ASCOR 3801 3802 DMM carrier set toln logical address 2 n n printf Connection Mn printf Connect positive source of DC Voltage to ASCOR DMM V terminal and n printf Connect negative source of DC Voltage to ASCOR DMM V terminal n n n SAMPLE DC VOLTAGE MEASUREMENT PROGRAM printf Initializing ASCOR DMM Initialize carrier as3801 init resourceName 1 1 amp Handle Initialize ASCOR DMM as1005 DMMInit Handle printf Initialized n n Set function mode to DC Voltage asl005 DMMSetFunction Handle asl005 VDC Set auto range x asl005 DMMSetAutoRange Handle 1 Measure DC Voltage getVDC 1 while getVDC printf Type M and lt Enter gt to measure DC Voltage n Type O and Enter to quit the programin scanf s userInput
105. it returns 0 3 for a 300mV input and 1e6 for 1 0 Mohm measurement This function is designed to read bursting measurements form the DMM resulting from DMMsSetTrigRead and DMMBurstRead operations Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdRead double FAR Pointer to a double that holds the next reading Return Value Integer value version code or an error code Value Meaning TRUE Measurement was read into pdRead FALSE No measurement is available TIMEOUT Communication timeout No reading available within 9s OVERRUN Communication overrun Controller did not keep up with DMM transmission Other Negative Value Error code Example double Reading 150 DMMBurstRead 0 4 150 4 settle 150 samples for i 0 i lt 150 i read 150 measurements while DMMReadMeasurement 0 Reading i FALSE wait for all measurements to be ready and read them Page 146 Operation Manual User Manual 07503800 Model 3800 DMMReadMedian MODEL 1004 O MODEL 1005 Description Return ACV signal s Median value int DMMReadMedian int nDmm double FAR pdResult Remarks This is a Secondary function and the DMM must be in ACV measurement function and a valid range must be set A double precision floating point Median voltage result is stored in the location pointed to by IpdResult This measurement is a composite function which utilizes several sub functions and cou
106. it returns a string See DMMGetdB for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszDB LPCSTR Points to a buffer at least 64 characters long to hold the result The return value will consist of a leading sign a floating point and a dB unit specifier Return Value Integer string length if successful or an error code Value Meaning Negative Value Error code Example char cBuf 64 int strLength DMMGetdBStr 0 cBuf Page 111 Operation Manual User Manual 07503800 Model 3800 DMMGetDeviation MODEL 1004 MODEL 1005 Description Get percent deviation from the reading at the time relative was activated int DMMGetDeviation int z Drum double FAR pdDev Remarks This function returns a double floating value that is the percent deviation relative to the reading made just before the relative function was activated This function is useful in guantifying measurement errors It can be used for bandwidth measurements or DC evaluation or percent variation of a device under test over temperature Return Value Example int status Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdDev double FAR Pointer where the deviation value is to be saved Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code double FAR error DMMGetDev
107. l 3800 Accessories Several accessories are available for the MODEL 1004 and the MODEL 1005 DMMs which can be purchased directly from Ascor These include DMM probes Deluxe DMM probe set Page 62 Operation Manual User Manual 07503800 Model 3800 3 0 Getting Started After unpacking the 38XX VXI module please inspect for any shipping damage that may have occurred and report any claims to your transportation carrier The 38XX is shipped with the Digital Multimeter module USB FLASH drive which contain the various software panels and drivers plus the calibration data specific for the unit and this Operator s manual 3 1 Setting the DMM The MODEL 1004 series DMMs are VXI plug and play devices and do not require any switch settings or any other adjustments to the DMM prior to installation The SM40CAL DAT file supplied with your DMM has a unigue calibration record for that DMM See Calibration at the end of this manual When using multiple DMMs in the same chassis the SM40CAL DAT file must have a calibration record for each DMM You must append the unigue calibration records of each DMM into one SM40CAL DAT file using a text editor In general the SM40CAL DAT file should be placed at the root C directory 3 2 Installing the Software It is recommended that you plug the DMM s into the VXI chassis then turn on the computer power The first time you power up our computer with the DMM installed your computer will d
108. ld take over 10 seconds to perform See the Median measurement section of the manual for more detail Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdResult double FAR Points to a double that holds the median voltage Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code Example double Median int status DMMReadMedian 0 amp Median Page 147 Operation Manual User Manual 07503800 Model 3800 DMMReadNorm MODEL 1004 MODEL 1005 M Description Remarks Return Value Take a reading that is in base value int DMMReadNorm int nDmm double FAR pdRead This Primary read function is similar to DMMRead It returns a double floating point reading The returned value is corrected for base units That is it returns 0 3 for a 300 mV input and 1e6 for 1 0 MOhm Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdRead double FAR Pointer to a location where the reading is saved Integer value version code or an error code Value Meaning DMM_E_RANGE Over Under range error Negative Value Error code DMM_OKAY Valid return Example double reading int status DMMReadNorm 0 reading Page 148 Operation Manual User Manual 07503800 Model 3800 DMMReadPeakToPeak MODEL 1004 O MODEL 1005 Description Return ACV sign
109. mV 190 mV 188 573 mV 191 427 mV 2 100 mV 0 1022 s 1 8852 19148 V 0 9715 v 1 0285 v Page 184 Operation Manual User Manual 07503800 Model 3800 18 9085 V 19 0915 v 250 V 9 755 V 10 245 V 250 V 100 V 99 35 V 100 65 V Page 185 Operation Manual User Manual 07503800 Model 3800 6 6 DC Current Test The following procedure may be used to verify the accuracy of the DCI function 1 If you have not done so install the MODEL 1004 and place the covers back on to the computer Ensure that the computer has been on for at least one half hour with the covers on before conducting this test 2 Remove all connections from the MODEL 1004 inputs Select the DCI function Autorange Allow the MODEL 1004 to settle for a few seconds and perform the Relative function 3 Apply the following DC currents to the L4O amp terminals Check to see that the displayed reading on the SMX2040 is within the indicated readings range Table 9 7 DC Current Test Range Input Minimum Reading Maximum reading 0 mA open 0 0004 mA 0 0004 mA 0 9986 mA 1 0014 ma sima 0 mA open 0 003 mA 0 003 mA 2 3 9 987 mA 10 013 mA 5 ls 330 mA 0 mA open 0 060 mA 0 060 mA 330 mA 100 mA 99 865 mA 100 135 mA a 25 joa 000854 0 00035 A 0 99315 A 1 00685 Page 186 Operation Manual User Manual 07503800 Model 3800 6 7 AC Current Test The following procedure may be used to verify the
110. mple DMMDelay 1 2 wait for 1 2 Sec Page 104 Operation Manual User Manual 07503800 Model 3800 DMMDisable TrimDAC MODEL 1004 O MODEL 1005 M Description Terminate the operation of the Trim DAC int DMMDisableTrimDA C int nDmm Remarks This function disables the Trim DAC Since usage of the Trim DAC consumes a lot of the on board microcontroller s resources it must be turned off with this function when not in use See DMMSetTrimDAC DMMSetDCVSource and DMMSetACVSource for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example DMMDisableTrimDAC 0 Remove Trim DAC from operation Page 105 Operation Manual User Manual 07503800 Model 3800 DMMDisaArm Trigger MODEL 1004 MODEL 1005 Description Abort trigger operation int DMMDisArmTrigger int nDmm Remarks This function sends the DMM a trigger termination command If the DMM is waiting for a trigger it will exit the wait mode and be ready for a new operation It can be used following an external hardware or analog level trigger arm command DMMArmAnalogTrigger DAMArmTrigger or DMMTrigger It can be used with no limitation Parameter nDmm Return Value Integer error code Value DMM_OKAY Negative Value Type Description int Identifies t
111. n 3 Apply the following DC voltages to the V amp terminals Check to see that the displayed reading on the MODEL 1004 is within the indicated range Table 9 2 DC Voltage Test Input Minimum Reading Maximum Reading xomv ov hor PH 330 mV 190 mV 189 9787 mV 190 0213 mV m 330 mV 190 mV 190 0213 mV 189 9787 mV 2 3 1900103 v s 1899898 V 19 00166 v 18 99834 V 190 0167 V 189 9833 V Page 181 Operation Manual User Manual 07503800 Model 3800 6 3 Resistance Test 2 wire The following procedure may be used to verify the accuracy of the 2 wire function 1 If you have not done so install the MODEL 1004 and place the covers back on to the computer Ensure that the computer has been on for at least one half hour with the covers on before conducting this test 2 Connect the MODEL 1004 V Q amp terminals to the calibrator HI amp LO Outputs Output 0 from the calibrator Allow the MODEL 1004 to settle for a few seconds and perform the Relative function This effectively nulls out the lead resistance of your cabling If you are using a Fluke 5700A or 5520A Calibrator the 2 wire Compensation feature will give a more accurate 2 wire ohms measurement See the Fluke Operator s Manual for further instructions 3 Apply the following Resistance values to the V amp terminals Check to see that the displayed reading on the MODEL 1004 is within the indicated range Table 9 3 Resistanc
112. n nDmm int Identifies the DMM DMMs are numbered starting with zero IpszReading LPSTR Points to a buffer at least 64 characters long to hold the result Return Value The return value is one of the following constants or the string length if OK Value Meaning DMM_OKAY Valid return Negative Value Error code Example char cBuf 64 int status DMMGetMinStr 0 cBuf Page 122 Operation Manual User Manual 07503800 Model 3800 DMMGetRange MODEL 1004 MODEL 1005 Description Get DMM range code int DMMGetRange int Dmm Remarks This function returns the DMM range code Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value Integer value corresponding to the currently set DMM range or an error code Value Meaning 0 First and lowest range 330 mV 33 Ohms 3 3 mA 1 Second range 3 3 V 330 Ohm 33 mA 2 Third range 3 Fourth range 4 Fifth range 330 kOhm 5 Sixth range 3 3 Mohm 3 3 H 6 Seventh range 33 MOhm 7 Eighth range 330 MOhm Negative Value Error code Example int id if DMMGetRange 0 0 printf Lowest range selected Page 123 Operation Manual User Manual 07503800 Model 3800 DMMGetRate MODEL 1004 MODEL 1005 Description Get DMM reading rate int DMMGetRate int nDmm double FAR pdRate Remarks This function returns a double floating rate in readings per second Parameter Type Description nDmm int Identifi
113. n returns a double floating value that is the maximum of the Min Max function value since either a function change range change or call to the DMMClearMinMax function was made This is only applicable to Primary read functions those that are read using DMMRead DMMReadStr or DMMReadNorm This value is updated every time one of those functions is used Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero double FAR Pointer where the Max value is to be saved Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example double FAR Mx int status DMMGetMax 0 amp Mx Page 119 Operation Manual User Manual 07503800 Model 3800 DMMGetMaxSir MODEL 1004 MODEL 1005 Description Returns the maximum as a formatted string int DMMGetMaxStr int nDmm LPSTR pszReading Remarks This function is the string version of DMMGetMax It returns the result as a string formatted for printing The print format is determined by the range and function See DMMGetMax for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszReading LPSTR Points to a buffer at least 64 characters long to hold the result Return Value The return value is one of the following constants or the string length if OK Value Meaning DMM_OKAY Valid return Negative Val
114. nRange int A pre defined constant corresponding to the desired range Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code DMM_E_RANGE Invalid DMM range value Example status DMMSetRange 0 330mA Page 166 Operation Manual User Manual 07503800 Model 3800 DMMSetRate MODEL 1004 MODEL 1005 Description Set the DMM reading rate int DUMSetRate int nDmm int nRate Remarks Return Value This function sets the reading rate used by the DMM The table of values is defined by the RATE values in the header file Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero nRate int A pre defined constant RATE_ corresponding to the desired reading rate The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code DMM E RATE Invalid DMM reading rate Example status DMMSetRate 0 RATE 0P1 Set to 0 1rps Page 167 Operation Manual User Manual 07503800 Model 3800 DMMSetRelative MODEL 1004 MODEL 1005 Description Set the DMM relative reading mode for the present function int DMMSetRelative int Dmm BOOL bRelative Remarks This function selects relative or absolute reading mode for the DMM If the bRelative parameter value is TRUE the DMM will change to relative r
115. nce for that DMM You must not alter this file unless you are performing an external calibration of the DMM This file may contain multiple records for more than one DMM Each record starts with a header line followed by calibration data card id 10123 type 2044 calibration date 06 15 1999 ad A D compensation 72 0 20 0 vdc VDC 330mV 3 3V 33V 330V ranges 1 entry is Offset the 2 is gain parameters 386 0 0 99961 37 0 999991 83 0 0 999795 8 8 1 00015 vac VAC 1st line DC offset Subsequent lines 1 entry is Offset the 2 is gain 3 freq comp 5 303 starting with the 330mV range and last line is for the 250V range 0 84 1 015461 23 0 0043 1 0256 23 0 0 1 02205 0 0 0 1 031386 0 idc IDC 3 3mA to 2 5A ranges 1 entry is offset 2 is gain parameter 1450 0 1 00103 176 0 1 00602 1450 0 1 00482 176 0 1 0 iac IAC 3 3mA to 2 5A ranges offset and gain 1 6 1 02402 0 0 1 03357 1 69 1 00513 0 0 1 0142 2w ohm Ohms 33 330 3 3k 330Meg ranges offset and gain 12700 0 1 002259 sin the MODEL 1004 the 1 and last lines are placeholders 1256 0 1 002307 110 0 1 002665 0 0 1 006304 0 0 1 003066 0 0 1 001848 0 0 0 995664 Page 92 Operation Manual User Manual 07503800 Model 3800 0 0 1 00030 The first line identifies the DMM and the calibration date The card id is stored in ROM on each DMM During initialization the driver uses the information from the DMM CEG file to identify where the
116. ng sem Joo os 33 O 1 9 9972 Q 10 0028 O 3300 6mo 330 0 100 Q 99 987 100 013 Q 3310 m mm 33 kO 0 999917 kO 1 000083 kO 33 kO 350 mQ 350 mO 5 33 KQ 10kQ 9 99905 10 00095 soo os so 6 330 KQ 100 KQ 99 986 100 014 1 MODEL 1005 only Note The use of 4 wire Ohms for resistance values above 300 kQ is not recommended Page 183 Operation Manual User Manual 07503800 Model 3800 6 5 AC Voltage Test The following procedure may be used to verify the accuracy of the ACV function 1 If you have not done so install the MODEL 1004 and place the covers back on to the computer Ensure that the computer has been on for at least one half hour with the covers on before conducting this test 2 Apply the following AC voltages to the V O amp terminals Check to see that the displayed reading on the SMX2040 is within the indicated readings range Table 9 5 Mid Frequency AC Voltage Tests All inputs are a sine wave at 400 Hz Step Minimum Reading Maximum reading 330 mV 9 8650 mV 10 1350 mV 330 mV 190 mV 189 5950 mV 190 4050 mV 100 mV 0 098735 V 0 101265 V 5 1 897565 V 1 902435 V 0 98327 V 1 01673 V a sv ww jissnnv 19 02687 V 250 V 9 864 V 10 136 V 250 V 190 V 189 756 V 190 244 V Table 9 6 High Frequency AC Voltage Tests All inputs are at 50 kHz Step Range Minimum Reading Maximum Reading 330 mV 9 707 mV 10 293 mV 330
117. nized 171 DMMSet Temp Units 172 DMMSetTrigRead 173 DMMSetTrimDAC 173 DMMsStartTotalizer 175 DMMStopTotalizer 176 DMMtTerminate 176 DMMTrigger 177 DMMWidthStr 178 6 0 MAINTENANCE Uer 127 6 1 PERFORMANCE TESTS 181 6 2 DC VOLTAGE TEST 181 6 3 RESISTANCE TEST 2 WIRE 6 4 RESISTANCE TEST 4 WIRE 6 5 AC VOLTAGE TEST 184 6 6 DC CURRENT TEST 186 6 7 AC CURRENT TEST 187 6 8 CAPACITANCE TEST MODEL 1005 ONLY 6 9 FREQUENCY COUNTER TEST MODEL 1005 ONLY 6 10 CALIBRATION 191 182 182 7 0 WARRANTY AND SERVICE Page 38 Operation Manual User Manual 07503800 Model 3800 8 0 ACCESSORIES 193 Page 39 Operation Manual User Manual 07503800 Model 3800 1 0 Introduction Congratulations You have purchased an instrument with analog and systems performance that rivals the best all in one box instruments The MODEL 1004 and MODEL 1005 series digital multimeters DMMs are easy to setup and use have sophisticated analog and digital circuitry to provide very repeatable measurements and are protected to handle any unexpected situations your measurement environment may encounter To get years of reliable service from these DMMs please take a few moments and review this manual before installing and using this precision instrument This manual describes the MODEL 1004 and MODEL 1005 DMMs Each DMM delivers unmatched breakthrough performance in a VXI instrument With a rich repertoire of functions the MODEL 1004 series out
118. nt 53 2 9 3 Duty Cycle Measurement 55 2 9 4 Pulse Width55 2 9 5 Totalizer 55 2 10 TRIGGER FUNCTIONS 55 2 10 1 External Hardware Trigger 55 Page 33 Operation Manual User Manual 07503800 Model 3800 2 10 2 Analog Threshold Trigger 56 2 11 SOURCE FUNCTIONS MODEL 1005 ONLY 57 2 11 1 DC Voltage Source 57 2 11 2 AC Voltage Source 57 2 11 3 DC Current Source 57 2 12 ACCURACY NOTES 59 2 13 OTHER SPECIFICATIONS 61 3 0 GETTING STARTED 63 3 1 SETTING THE DMM 63 3 2 INSTALLING THE SOFTWARE 63 3 3 INSTALLING THE 38XX VXI MODULE 63 3 4 DMM INPUT CONNECTORS 15 3 5 STARTING THE SOFT FRONT PANEL 67 3 6 USING THE SOFT FRONT PANEL 69 Page 34 Operation Manual User Manual 07503800 Model 3800 4 0 DMM OPERATION AND MEASUREMENT TUTORIAL 73 4 1 VOLTAGE MEASUREMENT 73 4 1 1 DC Voltage Measurements 73 4 1 2 True RMS AC Voltage Measurements 73 4 1 3 AC Peak to Peak and Crest Factor Measurement MODEL 1005 only 4 1 4 AC Median Value Measurement MODEL 1005 only 74 4 2 CURRENT MEASUREMENTS 76 4 2 1 Improving Current Measurements 76 4 2 2 Low Level DC Current Measurements 77 4 3 RESISTANCE MEASUREMENTS 77 4 3 1 2 wire Ohm Measurements 77 4 3 2 4 wire Ohm Measurements 78 4 3 3 6 wire Guarded Resistance Measurement MODEL 1005 only 78 4 3 4 Extended Ohms and Leakage Measurements MODEL 1005 only 4 4 RTD TEMPERATURE MEASUREMENT MODEL 1005 ONLY 81 4 5 INTERNAL TEMPERATURE MODEL 1005 ONLY 81 4 6 DIODE CH
119. o IpdResult double FAR Points to a double that holds the period Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code DMM_CNT_RNG Period measurement hardware is over or under range Example double d int status status DMMReadPeriod 0 amp d Page 150 Operation Manual User Manual 07503800 Model 3800 DMMReadStr MODEL 1004 MODEL 1005 Description Return the next reading from the DMM formatted for printing int DMMReadStr int nDmm LPSTR pszReading Remarks This function is the string version of DMMRead It reads the next Primary measurement result performs all scaling and conversion required and returns the result as a string formatted for printing The print format is determined by the range and function See DMMRead for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszReading LPSTR Points to a buffer at least 64 characters long to hold the converted result The return value will consist of a leading sign a floating point value in exponential notation and a unit specifier Return Value The return value is one of the following constants or the string length if OK Value Meaning DMM_OKAY Valid return Negative Value Error code DMM_E_RANGE DMM over range error occurred Example char cBuf 64 int status DMMReadingStr 0 cBuf Pag
120. o augment the main 12 bit DAC whenever it is not automatically performed such as in VDC and VAC source while OPEN LOOP mode is selected An example would be in DCI source or when setting the Comparator Threshold This function consumes a lot of the on board microcontroller s resources and must be turned off when not in use Use DMMDisableTrimDA CY to turn off With the Trim DAC the effective resolution of the composite DAC is increased to 16 bits With iValue set to 100 the Trim DAC adds slightly over 1 LSB of the 12 bit DAC See DMMSetDCVSource DMMSetACVSource for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iValue int Amplitude can be set from 0 to 100 corresponding to 0 to 100 Trim DAC level Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example DMMSetDCVSource 0 5 0 Set source to 5V DMMSetTrimDAC 0 50 add about 2 5mV to output Page 174 Operation Manual User Manual 07503800 Model 3800 DMMStartTotalizer MODEL 1004 O MODEL 1005 M Description Clear the totalized value and start the totalizer int DMMStartTotalizer int nDmm int Edge Remarks This is a Secondary function and the DMM must be in ACV measurement function and a valid range must be selected This function clears the Totalized count sets the edge sense and starts the Totalizer The totalized value
121. o be set Range 2 Hz to 76 kHz Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example double reading int I DMMSetACVSource 0 7 0 1000 0 source 7V and 1kHz DMMSetSourceMode 0 CLOSED LOOP Closed loop mode for 1 0 1 lt 100 1 DMMRead 0 amp reading update 100 times Page 155 Operation Manual User Manual 07503800 Model 3800 DMMSetAutoRange MODEL 1004 MODEL 1005 Description Enable Disable autorange operation of DMM int DMMSetAutoRange int nDmm BOOL bAuto Remarks This function enables or disables autorange operation of the DMM Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero bAuto BOOL Determines whether or not autoranging is done The value TRUE enables autoranging FALSE disables it Return Value The return value is one of the following constants Value Meaning DMM_OKAY Function succeeded Negative Value Error code Example status DMMSetAutoRange 0 TRUE enable autoranging Page 156 Operation Manual User Manual 07503800 Model 3800 DMMSetBuffTrigRead MODEL 1004 MODEL 1005 Description Setup the DMM for Triggered operation int DMMSetBuffTrigRead int nDmm int iSettle int iSamples int iEdge Remarks Setup the DMM for external hardware trigger operation Following reception of this command the DMM enters a wait state After reception of
122. o see that the displayed reading on the 44 is within the indicated range of readings Minimum Reading Maximum reading 9 785 qr 3 3 ur m 99 uF 10 1 ur 0 988 mF 1 012 mF 102 n Page 188 Operation Manual User Manual 07503800 Model 3800 6 9 Freguency Counter Test MODEL 1005 only The following procedure may be used to verify the accuracy of the Freguency Counter 1 If you have not done so install the DMM and place the covers back on to the computer Ensure that the computer has been on for at least one half hour with the covers on before conducting this test 2 Select the ACV function autorange Turn freg on 3 Apply the following AC voltages to the V amp terminals Check to see that the displayed reading on the 44 is within the indicated range of readings Table 9 9 ACV Freguency Counter Test Range Input Minimum Reading Maximum reading 330 mV 33 mV 40 Hz 39 9952 Hz 40 0048 Hz 2 ooo 330mv 40 Hz 39 9952 Hz 40 0048 Hz 2 3 3 3 V 40 Hz 39 9952 Hz 40 0048 Hz 330 V 33 V 40 Hz 39 9952 Hz 40 0048 Hz 5 5 330 mV 250 mV 100 kHz 99 996 kHz 100 004 kHz le sv 25 V 100 kHz 99 996 kHz 100 004 kHz 2 Select the ACI function autorange Turn freg on 3 Apply the following AC currents to the I 40 terminals Check to see that the displayed reading on the MODEL 1004 is within the tolerance appropriate for your application e g 90 day or 1 year accuracy Table
123. of the output voltage This function acts on the main 12 bit source DAC If better accuracy is needed it can be accomplished by selecting the ClosedLoop mode DMMSetSourceMode This mode engages the Trim DAC which augments the 12 bit DAC to produce 16 effective bits In ClosedLoop mode the source level is adjusted every time the DMM is read making small corrections until the reading is equal to dVolts However for the ClosedLoop mode to update the source level it is necessary to read the DMM multiple times Update rate should not exceed 10 rps when using the Closed Loop mode The DMM reads voltages using the 33 V range Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IdVolts double FAR DC voltage to be set Can be 10 5 to 10 5 V Return Value Integer error code Value Meanin DMM OKAY Operation successfully completed Negative Value Error code Example double reading int I DMMSetDCVSource 0 1 25 Set source to 1 25V DMMSetSourceMode 0 CLOSED LOOP Closed loop mode for 1 0 1 lt 100 1 DMMRead 0 amp reading update 100 times Page 162 Operation Manual User Manual 07503800 Model 3800 DMMSetFuncRange MODEL 1004 MI MODEL 1005 Description Set the DMM function and range int DMMSetFuncRange int nDmm int nFuncRnge Remarks This function sets both the function and the range used by the DMM The table of values is defined as VDC 330mV VAC 3300mV
124. ointed to by IpdResult It can read all the Primary functions those that can be selected using DMMSetFunction and DMMSetRange Returned result is a scaled value which is normilized to the selected range That is it returns 300 for 300mV input in the 330 mV range and 100 for 100 input in the 330k range Use the DMMReadNorm function for base units read function Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdResult double FAR Points to a double that holds the next reading Return Value The return value is one of the following constants Value Meaning DMM_OKAY DMM initialized successfully Negative Value Error code DMM_E_RANGE DMM over range error occurred Example double d int status status DMMRead 0 Page 139 Operation Manual User Manual 07503800 Model 3800 DMMReadBuffer MODEL 1004 MODEL 1005 Description Return the next double floating point reading from the DMM internal buffer int DMMReadBuffer int nDmm double FAR pdResult Remarks Read the next measurement from the DMM s internal buffer pointed to by an internal buffer pointer and increment the pointer Store the measurement as a 64 bit double precision floating point number in the location pointed to by IpdResult See DMMArmTrigger functions for more detail Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdResult double FAR
125. oltage Zener diodes Band Gap devices as well as IC testing and polarity checking Typical current level uncertainty for diode measurements is 1 and typical voltage uncertainty is 0 02 44 Shielded cable Figure 4 7 Measuring capacitors or inductors is best handled with coaxial or shielded probe wires 4 7 Capacitance Measurement MODEL 1005 The and MODEL 1005 measure capacitance using a differential charge slew method where variable currents are utilized to produce a dv dt across the capacitor Use short high guality shielded probe cables with no more than 500 pF With the exception of the 10 nF range each of the ranges has a reading span from 5 of range to full scale Capacitance values less than 5 of the selected range indicate zero Since some large value electrolytic capacitors have significant inductance as well as leakage and series resistance the Autoranging function may not be practical Page 82 Operation Manual User Manual 07503800 Model 3800 Because Capacitance measurement is sensitive to noise you should keep the measurement leads away from noise sources such as computer monitors For best measurement accuracy at low capacitance values zero the DMM using the Relative while in the 10 nF range The effect of the cable quality and its total capacitance is significant particularly on low value caps For testing surface mount parts use the optional Ascor SMT Tweeter probes You may increase the measu
126. ome R and vise versa For cases where this limit is a problem simply set the measurement polarity such that R is the higher of the two burden resistors Page 79 Operation Manual User Manual 07503800 Model 3800 To measure values greater than 330 k using the 6 wire guarded method it is necessary to select the 2 wire ohms function and maintain the 6 wire connection as in Figure 4 4 above 4 3 4 Extended Ohms and Leakage Measurements MODEL 1005 Leakage Measurement The MODEL 1005 measures leakage currents by sourcing a DC voltage and measuring current through an external shunt resistor See Figures 4 5 4 6 for configuration Set the DC voltage source using DMMSetDCVSource and read the leakage current by using DMMRead or DMMReadNorm functions The leakage voltage maybe set between 10V and 10 V The leakage currents measurement range is from nA to 20 mA depending on the value of the shunt resistor The value of this shunt resistor has to be conveyed to the DMM by using the DMMSetLeakageShunt function the default is 1 MQ The maximum leakage current is limited to 3 3V Rshunt It is neccessary to repeatedly read the leakage to allow the DMM to make on the fly corrections to the source compensating for stimulus errors due drift and load variations Performing open terminal calibration will imrove the accuracy of this function use DMMOpenTerminalCal with all terminals open Refer to Figures 4 5 and 4 6 below See section
127. omplies with the essential reguirements of the following applicable European Directives and carries the CE mark accordingly 89 336 EEC and 73 23 EEC EMC Directive and Low Voltage Directive EN61010 1 1993 Electrical Safety EN61326 1 1997 EMC Emissions and Immunity Manufacturer s Name Manufacturer s Address Giga tronics Incorporated 4650 Norris Canyon Road San Ramon California 94583 U S A Type of Equipment Model Series Number Switching Module 38XX XXXX Declaration of Conformity on file Contact Giga tronics at the following Giga tronics Incorporated 4650 Norris Canyon Road San Ramon California 94583 Telephone 800 726 4442 only within the United States 925 328 4650 Fax 925 328 4700 Page 3 Operation Manual User Manual 07503800 Model 3800 Record of Changes to This Manual Use the table below to maintain a permanent record of changes to this document Corrected replacement pages are issued as Technical Publication Change Instructions TPCI When you are issued a TPCI do the following 1 Insert the TPCI at the front of the manual binder 2 Remove the pages from the manual binder that are noted in the TPCI 3 Replace the page s removed in the previous step with the corrected page s 4 Record the changes in the table below TPCI TPCI Issue Date Entered Comments Number Date Page 4 Operation Manual User Manual 07503800
128. on of this command the DMM makes measurements continuously waiting for a value which exceeds the threshold dThresh When this occurs a trigger is produced with identical processing as in DMMArmtTrigger Threshold crossing sense is determined by the first measurement following the call of DMMArmAnalogTrigger If that measurement is lower than the set threshold dThresh subsequent measurements greater than dThresh will trigger the DMM If the first measurement is greater than dThresh subsequent measurements smaller than dThresh will trigger For example if dThresh is 2 00000 V and the first reading after arming the DMM is 2 500000 V then 1 999999 V or smaller will trigger the DMM On the other hand if dThresh is 1 000000 V and the first reading after arming the DMM is 0 500000 V then 1 000001 V or greater will trigger the DMM The dThresh value is in base units and must be within the DMM range setting For example in the 330 mV range dThresh must be within 0 330000 and 0 330000 In the 33 range dThresh must be between 0 0 and 33 0e3 Following an analog level trigger event the DMM makes iSamples readings at the set function range and reading rate and stores them in an internal buffer Autoranging is not allowed when using DMMAnalogTrigger Between the time the DMMArmaAnalogTrigger is issued and the time the buffer is read no other command should be sent to the DMM One exception is the DMMDisArmTrigger command Use the D
129. oot of L C Be certain the cable is long enough such that both the capacitance and inductance are within the specified measurement range of the MODEL 1005 4 10 Trigger Operation 4 10 1 External Hardware Trigger The Trigger functions provide for a stand alone capture of measurements The local controller supervises the operation and when conditions are valid it captures data into its buffer or sends it back to the PC bus The reading rate must be set to 10 rps or higher The External Trigger s isolated high and low input lines are provided at pins 7 and 4 respectively on the DIN connector You can abort the External Trigger modes by sending the DMM the Disarm command The hardware trigger functions include DMMArmTrigger DMMSetBuffTrigRead and DMMSetTrigRead Read about these functions in the Windows Command Language section 5 6 for details Warning The DIN connector pins are only protected to a maximum of 30 V with respect to the PC chassis or any other DMM terminal Do not apply any voltages greater than 30 V to the DIN connector pins Violating this limit may result in personal injury and or permanent damage to the DMM Page 83 Operation Manual User Manual 07503800 Model 3800 4 10 2 Analog Threshold Trigger This mode triggers the DMM at a specific input level A command to the DMM sets a threshold value and arms the DMM Analog trigger The DMM s local controller waits for the level crossing and captures up to 64 r
130. otalizer int DMMStopTotalizer int nDmm Remarks This function stops the accumulation process Following this function the totalized value can be read For details see DMMStartTotalizer Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation was successful Negative Value Error code Example int status DMMStopTotalizer 0 DMMTerminate MODEL 1004 M MODEL 1005 Description Terminate DMM operation DLL int DMMTerminate int zDmm Remarks Removes DMM number nDmm This routine is used only where it is needed to terminate one DMM and start a new one at the same nDmm location Otherwise it is not recommended to use this function Parameter Type Description nDmm int Identifies the DMM to be suspended Return Value The return value is one of the following constants Value Meaning TRUE DMM Terminated FALSE DMM was not initialized termination is redundant Example DMMTerminate 0 Terminate DMM 0 Page 176 Operation Manual User Manual 07503800 Model 3800 DMMTrigger MODEL 1004 MODEL 1005 Description Software Trigger the DMM Take iSamples int DMMTrigger int nDmm int iSamples Remarks Following reception of this command the DMM makes iSamples readings at the currently set function range and rate and stores them in an internal buffer Rate can be set between
131. ote For Win9x Operating System substitute Winxx with WIN95 For WinNT and Win2000 Operating System substitute Winxx with WINNT Sample C code files sampleVDC c and sampleMeasurement c can be modified and compiled on any C language development environmen They are located in the same folder with the sample programs in C Vxipnp Winxx as3801 folder The function prototypes for the VXIplug play driver functions used in the sample programs can be found in the include files asl005 h and as3801 h These files ar part of the ASCOR 3801 3802 VXIplugeplay driver and they are located in C Vxipnp Winxx include folder SAMPLE PROGRAMS INSTRUCTION To run these programs Locate these programs in C Vxipnp Winxx as3801 folder Select the program you wish to run Press Enter Following is a step by step instruction of the sample programs sampleVDC exe Page 21 Operation Manual User Manual 07503800 Model 3800 Type Type O sampleMeasurement and press the En and press the En ter to measure DC Voltage ter to Type A Type Type Type Type D and press the E Type Type Type Type F Type Type Type Type P Type Type Type Type R t Type Type Type Type O d and press the M and press the S and press the Q and press th xit the program ter to select VAC mode Enter to measure AC Voltage Enter to s
132. performs all other plug in DMMs Note In this manual all references to the MODEL 1004 apply to the Ascor MODEL 1004 and references to MODEL 1005 and DMM LCR apply to the Ascor MODEL 1005 The term DMM will frequently be used to reference both types of units Features unique to the MODEL 1005 will be identified as such 1 1 Safety Considerations Safety Considerations The MODEL 1004 series of DMMs is capable of measuring up to 300 VDC or 250 VAC across the Volt HI and LO terminals and can also measure common mode signals that float the DMM above EARTH ground by up to 300 VDC or 250 VAC When making common mode measurements the majority of the circuits inside the DMM are at the common mode voltage These voltages can be lethal and can KILL During and after installing your DMM check to see that there are no wires or ribbon cables from your PC trapped inside the DMM The DMM comes installed with four shields bottom top and two edge strips that must not be removed for performance as well as safety reasons Removal of these shields and or improper assembly of the shields can result in lethal voltages occurring within your PC Be sure to check your installation before closing the cover on your personal computer Warning Check to see that no loose wires or ribbon cables infringe upon any of the internal circuits of the DMM as this may apply measurement voltages to your computer causing electrocution and or damage to your compute
133. ple int status DMMPolledReadCmd 0 Page 137 Operation Manual User Manual 07503800 Model 3800 DMMPolledReadStr MODEL 1004 MODEL 1005 Description If DMM is ready return the next reading from the DMM formatted for printing int DMMPolledReadStr int nDmm LPSTR IpszReading Remarks This function is a string version of DMMPolledRead See DMMPolledRead for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszReading LPSTR Points to a buffer at least 64 characters long to hold the converted result The return value will consist of a leading sign a floating point value in exponential notation and a unit specifier Return Value The return value is one of the following constants or the string length if OK Value Meaning FALSE DMM is not ready TRUE DMM is ready and reading is placed at pszReading Negative Value Error code Example char strMsg 64 if DMMPolledReadStr 0 strMsg MessageBox 0 strMsg MODEL 1005 MB OK display readings Page 138 Operation Manual User Manual 07503800 Model 3800 DMMRead MODEL 1004 MODEL 1005 Description Return the next floating point reading from the DMM int DMMRead int double FAR pdResult Remarks DMMRead reads the next result from the DMM performs all scaling and conversion required and returns the result as a 64 bit double precision floating point number in the location p
134. pleted Negative Value Error code Example DMMSetFunction 0 RTD RTD measurement function DMMSetRange 0 pt385 Select RTD DMMSetRTD 0 RTD 4 W 1000 0 Set Ro 1k Ohms Page 169 Operation Manual User Manual 07503800 Model 3800 DMMSetSourceMode MODEL 1004 LI MODEL 1005 Description Set the DCV and ACV sources to ClosedLoop or OpenLoop mode int DMMSetSourceMode int nDmm int iMode Remarks This Secondary function sets the DC and AC voltage sources to either OPEN_LOOP or CLOSED LOOP In CLOSED LOOP the sources use the main 12 bit source DAC In CLOSED LOOP the Trim DAC is also used which augments the 12 bit DAC to produce 16 effective bits Open loop updates are very guick In ClosedLoop mode the source level is adjusted every time the DMM is read making small corrections until the reading is equal to the set voltage However for the ClosedLoop mode to update the source level it is necessary to read the DMM multiple times See DMMSetDCVSource and DMMSetACVSource for more details Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iMode int Source adjustment mode CLOSED_LOOP or OPEN_LOOP Return Value Integer error code Value Meanin DMM OKAY Operation successfully completed Negative Value Error code Example DMMSetSourceMode 0 CLOSED LOOP Select closed loop mode Page 170 Operation Manual User Manual 07503800 Model 3800 DMM
135. practical for the application Reading Rate rps Power Line frequency Operation Manual User Manual 07503800 Model 3800 Reading Rates vs Digits of Resolution For reading rates of 10 readings per second rps and slower the DMM has 6 1 2 digits of resolution For reading rates from 10 rps to 30 rps the DMM has 5 Y digits of resolution Page 60 Operation Manual User Manual 07503800 Model 3800 2 13 Other Specifications Temperature Coefficient All Functions Less than 0 1 x accuracy specification per C at 23C 5 C Reading Rate user selectable e 0 5 to 1 000 readings per second rps e Up to 10 rps 6 Y digits e Up to 30 rps 5 Ya digits Hardware Interface VXI Bus Overload Protection voltage inputs 300 VDC 250 VAC Isolation 300 VDC 250 VAC from Earth Ground Maximum Input Volt x Hertz 8x106 Volt x Hz normal mode input across Voltage HI amp LO 1x106 Volt x Hz Common Mode input from Voltage HI or LO relative to Earth Ground Safety Designed to IEC 1010 1 Installation Category II Calibration All calibration constants are stored in a text file Temperature Range 0 C to 50 C operating Size 8 2 X 4 4 DMM Internal Temperature 2 Measurement MODEL 1005 Power 45 volts 300 mA maximum Note Ascor reserves the right to make changes in materials specifications product functionality or accessories without notice Page 61 Operation Manual User Manual 07503800 Mode
136. pszPos and lpszNeg See DMMReadWidth for more details Return Value Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero lpszPos LPSTR Points to a buffer at least 64 characters long to hold the positive width result IpszNeg LPSTR Points to a buffer at least 64 characters long to hold the negative width result The return value is one of the following constants Value Meaning DMM_OKAY Valid return Negative Value Error code Example char P 64 N 64 int status DMMWidthStr 0 P N Page 178 Operation Manual User Manual 07503800 Model 3800 6 0 Maintenance Warning These service instructions are for use by gualified personnel only To avoid electric shock do not perform any procedures in this section unless you are gualified to do so This section presents maintenance information for the DMM Test eguipment recommended for calibration is listed below If the recommended eguipment is not available eguipment that meets the indicated minimum specifications may be substituted In general the calibration eguipment should be at least three times more accurate than the DMM specifications Table 9 1 Recommended Test Eguipment Instrument Type Minimum Specifications Recommended Model DC Voltage Range 0 300 V Voltage Accuracy 9 ppm AC Voltage Range 0 250 V Voltage Accuracy 0 014 Multi Function Calibrator Resistance Range 0 330 MO Fluke 5520A Resistance Accura
137. r Q Read measurement asl005 DMMReadNorm Handle printf The resistance value is f else modeMeas 0 if userChar Q exitProg 1 break else if functMode Q exitProg 1 Terminate DMM asl005 DMMTerminate Handl Close carrier as3801 close 1 return 0 Page 32 Operation Manual User Manual 07503800 Model 3800 Chapter 11 Aquiris DMM Manual TABLE OF CONTENTS 1 0 INTRODUCTION 40 1 1 SAFETY CONSIDERATIONS 40 1 2 MINIMUM REQUIREMENTS 41 1 3 FEATURE SET 41 2 0 SPECIFICATIONS 43 2 1 DC VOLTAGE MEASUREMENT 43 2 2 DC CURRENT MEASUREMENT 43 2 3 AC VOLTAGE MEASUREMENTS 44 2 3 1 AC Voltage True RMS Measurement 44 2 3 2 AC Peak to Peak Measurement MODEL 1005 only 46 2 3 3 AC Crest Factor Measurement MODEL 1005 only 46 2 3 4 AC Median Value Measurement MODEL 1005 only 46 2 4 AC CURRENT MEASUREMENT TRUE RMS 48 2 5 RESISTANCE MEASUREMENTS 49 2 5 1 2 wire and 4 wire 49 2 5 2 6 wire Guarded Resistance Measurement MODEL 1005 only 49 2 6 LEAKAGE MEASUREMENT MODEL 1005 ONLY 49 2 7 RTD TEMPERATURE MEASUREMENT MODEL 1005 ONLY 50 2 8 ADDITIONAL COMPONENT MEASUREMENT CAPABILITY 51 2 8 1 Diode Characterization 51 2 8 2 Capacitance Measurement MODEL 1005 only 51 2 8 3 Inductance Measurement MODEL 1005 only 51 2 9 TIMING MEASUREMENTS MODEL 1005 ONLY 53 2 9 1 Threshold DAC 53 2 9 2 Frequency and Period Measureme
138. r To avoid shock hazard install the DMM only into a computer that has its power connector connected to a power receptacle with an earth safety ground Page 40 Operation Manual User Manual 07503800 Model 3800 When making any measurements above 50 VDC or 40 VAC only use Safety Test Leads Examples of these are the Ascor Basic Test Leads and Deluxe Test Leads offered as an accessory with the Ascor DMMs 1 2 Minimum Requirements The MODEL 1004 and the MODEL 1005 are meant to be used with Ascor s 38xx VXI series and other Ascor Inc instrumentation units A VXI Plug amp Play driver is provided by Ascor for the 38XX VXI series 1 3 Feature Set The base unit the MODEL 1004 has 6 1 2 digit performance and can be used as a general purpose DMM giving very accurate and stable readings The state of the art MODEL 1005 is a superset of the MODEL 1004 adding inductance amp capacitive measurement and sourcing capabilities MODEL 1004 and MODEL 1005 6 Digit DMMs feature table Function MODEL 1004 MODEL 1005 DMM LCR Sourcing DMM DCV 4 ranges gt 10 GO amp 10 MO input y resistance ACV 4 ranges 1 MO input E PANAS plus 33 O 330 MO 4 Wire Ohms four ranges 330 to 330 E plus 33 range DC current four ranges 3 3 mA to 2 5 A AC current four ranges 3 3 mA to 2 5 A o Pr 2 Wire Ohms six ranges 330 to 33 Auto range Relative Min Max dB and percent deviation functions On board measuremen
139. rement speed by using the SetCapsAveSamp function 4 8 Inductance Measurement MODEL 1005 The MODEL 1005 measures inductance using a precision AC source with a frequency range of 20 Hz to 75 kHz Since inductors can vary greatly with frequency you should choose the appropriate generator frequency In addition to inductance the inductor s Q factor can be measured A high quality coaxial or at least a shielded cable is highly recommended For best accuracy perform the Open Terminal Calibration function within an hour of inductance measurements The Open Terminal Calibration function must be performed with the cables plugged into the DMM but with the other end open circuited This process characterizes the internal signal path inside the DMM the open application cable and the DMM circuitry Set the measurement rate to 10 rps or lower for best accuracy For best measurement accuracy at low inductance values zero the DMM often by using the Relative function with the leads shorted This must be done after Open Terminal Calibration operation This Relative action measures and removes the inductance of the DMM signal path and that of the application cable 4 9 Characteristic Impedance Measurement MODEL 1005 To measure transmission line s characteristic impedance measure the cable s capacitance C with the end of the cable open and then it s inductance L with the end of the cable shorted The cable s impedance equals the square r
140. rom file int DMMLoadCalFile int nDmm LPCSTR IpszCal Remarks This function provides the capability to reload the calibration record This is useful in making limited calibration adjustments to the DMM By having a copy of the original calibration file SM40CAL DAT open with an editor and modifying calibration entries then reloading it using DMMLoadCalFile one can instantly verify the corrections made Make sure the SM40CAL DAT file itself is not altered since that will void the calibration Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpszCal LPCSTR Points to the name of the file containing the calibration constants for the DMM Return Value The return value is one of the following constants Value Meaning DMM_OKAY Cal record loaded successfully Negative Value Error code Example Load a modified copy of the original calibration file to verify correction made to a specific entry int i DMMLoadCalFile 0 C NCAL A dat Page 133 Operation Manual User Manual 07503800 Model 3800 DMMOpen TerminalCal MODEL 1004 O MODEL 1005 Description Calibrate the Inductance measurement function with open terminals int DMMOpenTerminalCal int nDmm Remarks This function characterizes the Inductance measurement path and source which is required prior to making inductance measurements It should be performed within one hour before using the inductance measur
141. s Range Frequency 24 hours 90 Days One Year 23 C 1 C 23 C 10 C 23 C 10 C 25A Page 48 Operation Manual User Manual 07503800 Model 3800 2 5 Resistance Measurements 2 5 1 2 wire and 4 wire Accuracy of reading Q 1 Range 2 Full Scale Resolution Source 24 hours 90 Days One Year t 6 V Digits UTE 23 C 1 C 23 C 10 C 23 C 10 C 33 3 33 00000 10 uQ 10 0 0038 1 mQ 0 005 1 5 mQ 0 008 2 mQ 3300 330 0000 100 uQ 0 0037 4 5mQ 0 0046 5 mQ 0 007 6 mQ 3 300000 kO 00003428mo 0 003 32ma 0 005 33 mO 1 With reading rate set to 2 rps or slower and within one hour of Ohms zero using Relative control 2 4 wire ohms is available up to the 330 kQ range 3 33 and 330 MQ ranges are only available with the and MODEL 1005 33 33 00000 100 HA 0 0025 300mQ 0 0033 330m0 0 006 350 mQ 2 5 2 6 wire Guarded Resistance Measurement MODEL 1005 Typical additional error contributed by guarding Accuracy of reading Q 1 This table should be used in conjunction with the 2 wire and 4 wire table above 2 6 Leakage Measurement MODEL 1005 Accuracy of reading Q 1 Leakage Reading Source Voltage range One Year 23 C 5 C 1 1 00 nA to 100 00 nA 10 V to 10 V 2 350 pA 100 00 nA to 1000 00nA 9 V to 9 V 1242nA 1000 00 nA to 3 3 uA 7Vtot 7V 1 5 20nA Page 49 Operation Manual User Manual 0750
142. s also the Source HI for 4WQ measurements The maximum input across V A and V O is 300 VDC or 250 VAC when in the measuring mode When in the sourcing mode the maximum input allowed before damage occurs is 100 volts V This is the negative terminal for all Volts 2WQ capacitance diode and inductance measurements and or sourcing of VDC VAC and IDC It is also the Source LO for 4WQ Do not float this terminal or any other DMM terminal more than 300 VDC or 250 VAC above Earth Ground Also see Trig 6W Guard below I This is the positive terminal for all Current measurements It is also the Sense HI for 4WQ measurements and 6WQ guarded measurements The maximum input across I 4WQ and I 4WQ is 2 5 A Do not apply more than 5 V peak across these two terminals Page 65 Operation Manual User Manual 07503800 Model 3800 I This is the negative terminal for all Current measurements In the Current modes it is protected with a 2 5 A 250 V Fast Blow fuse 5 x 20 mm It is also the Sense LO for 4WQ measurements and 6WQ guarded measurements V and I 4WO should never have more than 5 V peak across them Page 66 Operation Manual User Manual 07503800 Model 3800 TRIG GUARD Both the Trigger and Guard functions use the DIN 7 connector This group of pins include the positive and negative hardware trigger input lines and the two MODEL 1005 Guarded Measurement Force and Sense signals The external trigger init
143. so the Sense LO for 4WQ measurements and 6WQ guarded measurements V and I 4WQ should never have more than 5 V peak across them TRIG GUARD Model 1005 only Both the Trigger and Guard functions use the DIN 7 connector This group of pins include the positive and negative hardware trigger input lines and the two MODEL 1005 Guarded Measurement Force and Sense signals The external trigger initiates reading s into the onboard buffer and the 6W guard signals facilitate in circuit resistor measurements by means of isolating a loading node The DIN 7 plug can be ordered from Ascor and is also available at many electronic hardware distributors The connector is generically referred to as a mini DIN 7 male The trigger signal should be in the range of 3 V to 12 V peak The two 6W guard signals should never have more than 5 V peak across them Warning The DIN connector pins are protected to a maximum of 35 V with respect to the PC chassis and any other DMM terminal Do not apply any voltages greater than 35 V to the DIN connector pins Violating this limit may result in personal injury and or permanent damage to the DMM e GuadSeme MODELI0 DIN 7 Connector Pin Description view from bracket side Page 16 Operation Manual User Manual 07503800 Model 3800 Chapter 9 README FILE FOR 38xx DMM THE FOLLOWING README FILE IS PRESENTED AS A REFERENCE DOCUMENT It contains valuable information concerning installation procedures
144. sult The return value will consist of a leading sign a floating point value in exponential notation and a unit specifier Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code DMM_CNT_RNG Period measurement H W is over or under range Example char cBuf 64 int status status DMMPeriodStr 0 cBuf Page 135 Operation Manual User Manual 07503800 Model 3800 DMMPolledRead MODEL 1004 MODEL 1005 Description Tests the DMM for ready status and returns the next floating point reading int DMMPolledRead int double FAR pdResult Remarks DMMPolledRead polls the DMM for readiness If the DMM is not ready it will return FALSE If the DMM is ready with a new reading it will return TRUE and the reading will be placed at the location pointed to by IpdResult See DMMPolledReadCmd for more details Do not use DMMREeady to check for readiness since it will cause communication failure Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdResult double FAR Points to a double which holds the next reading Return Value The return value is one of the following constants Value Meaning FALSE DMM is not ready TRUE DMM is ready and reading is placed at IpdResult Negative Value Error code Example double read if DMMPolledRead 0 amp d fprint 9 4fWn d Sho
145. surement are read must keep up with the DMM transmission of readings The DMM has a built in 5 readings FIFO to help with this problem This function is usable for VDC VAC Ohms IAC IDC and RTD measurements Use the DMMReadMeasurement to monitor for data avialability and to read this data Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero iSettle int The number of setteling measurements prior to read value Must be set between 0 and 120 Recommended value is 4 iSamples int The number of samples the DMM takes following the same number of trigger pulses This number must be between 1 and 250 inclusive iEdge int The edge polarity of the trigger signal 1 for Positive or leading edge and 0 for negative or trailing edge trigger Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully terminated Negative Value Error code Example double Reading 150 DMMSetTrigRead 0 4 150 0 Negative edge 4 setteling readings and 150 samples triggers for i 0 i lt 150 i read buffer while DMMReadMeasurement 0 Reading i DMMSetTrimDAC MODEL 1004 LI MODEL 1005 M Description Set the Trim DAC level Page 173 Operation Manual User Manual 07503800 Model 3800 int DMMSetTrimDA C int nDmm int iValue Remarks This Secondary function sets the Trim DAC to a value between 0 and 100 The trim DAC can be set t
146. t Factor int DMMReadCrestFactor int nDmm double FAR pdResult Remarks This is a Secondary function and the DMM must be in ACV measurement function and a valid range must be set A double precision floating point Crest Factor is stored in the location pointed to by pdResult This measurement is a composite function utilizing several sub functions and could take over 10 seconds to perform See the Crest Factor measurement section of the manual for more detail Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdResult double FAR Points to a double that holds the Crest Factor Return Value The return value is one of the following constants Value Meaning DMM_OKAY Operation successfully completed Negative Value Error code Example double CF int status DMMReadCrestFactor 0 amp CF Page 142 Operation Manual User Manual 07503800 Model 3800 DMMReadDutyCycle MODEL 1004 O MODEL 1005 Description Return percent duty cycle of ACV signal int DMMReadDutyCycle int nDmm double FAR pdDcy Remarks This is a Secondary function and the DMM must be in AC measurement function and a valid range must be set It returns percent duty cycle of the signal It is stored as double precision floating point number in the location pointed to by pdDcy The measured duty cycle is affected by the setting of the Threshold DAC Parameter Type Description nDmm int Identifies the DMM DMMs
147. t buffer ly y y y y y y N Diode V I characteristics at 100 nA to ImA y y 4 y y Measurement rae 02 to lec Extemal and threshold wigger Capacitance seven ranges 0nFt010mF_ Temperature five basie RTD types Frequency Period measurement Pulse width pos neg amp duty cycle 4 Page 41 Operation Manual User Manual 07503800 Model 3800 Torizerlevent cover Variable threshold DAC all iming measure y Pek to Peak Crest factor Median L DMM temperature sensor J L Six wire Ohms with oreesense L L Inductance six ranges 33 pio 33H L __ source oro 00 YI ACV source 01020 V plepk 2 Hzto75KHz Y DE current source 1 nato 125ma __ Leakage viti external Meg L o High Ohms range 1 000 Meg y f Page 42 Operation Manual User Manual 07503800 Model 3800 2 0 Specifications 2 1 DC Voltage Measurement Input Characteristics Input Resistance 330 mV amp 3 3 V Ranges gt 10 Input Resistance 33 V amp 330 V Ranges 10 MO Accuracy of reading Volts 1 Range Full Scale Resolution 24 hours 90 Days One Year 23 C 6 Ys Digits 23 C 1 C 23 5 C 330 mV 330 0000 mV 100 nV 0 003 4 5 uV 0 004 5 5 0 007 8 uV 3 300000 V 0 002 10uV 0 0025 12 uV 0 0045 17 uV 33 00000 V 10 uV 0 003 250 uV 0 004 280 uV 0 007 330 uV 330 V 330 0000 V 100uV 0 004 1 mV 0 005 1 2 mV
148. teger error code Value Meanin DMM OKAY Operation successfully completed Negative Value Error code Example DMMSetCompThreshold 0 28 5 Set comp threshold to 28 5V Page 159 Operation Manual User Manual 07503800 Model 3800 DMMSetCounterRng MODEL 1004 O MODEL 1005 Description Set the frequency counter to a specific range int DUMSetCounterRng int nDmm int fRange Remarks This function forces the auto ranging frequency counter to a specific range fRange Use this function if the approximate frequency to be measured is known It will eliminate the time necessary for the counter to autorange to the appropriate range It saves time by removing the requirement to make multiple frequency measurements in order to allow the counter to range All ranges are defind in UserDMM h file Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero JRange int The range to be set is a value between 0 and 7 See UserDMM h Return Value Integer error code Value Meanin DMM OKAY Operation successfully completed Negative Value Error code Example DMMSetCounterRng 0 COUNTR 320HZ Set counter to measure a frequency between 65Hz to 320Hz Page 160 Operation Manual User Manual 07503800 Model 3800 DMMSetDCISource MODEL 1004 O MODEL 1005 Description Set the DCI source output level int DUMSetDCISource int nDmm double FAR dAmps Remarks This Secondary function sets the DC
149. the negative width Return Value The return value is one of the following constants Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example double pw nw int state state DMMReadWidth 0 amp pw amp nw Page 153 Operation Manual User Manual 07503800 Model 3800 DMMReady MODEL 1004 MODEL 1005 Description Return the ready state of the DMM following trigger operation int DMMReady int nDmm Remarks Following the completion of a triggered measurement event be it hardware or software the DMM indicates the completion The DMMReady function checks the DMM and returns TRUE if ready and FALSE otherwise Once a TRUE status is returned the DMMReady function should not be used again since a TRUE also indicates that some flags have been clear which allow further operations See DMMArmaAnalogTrigger DMMArmTriggerO DMMTrigger DMMReadBuffer and DMMPolledRead for more details on this function Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value The return value is one of the following constants Value Meaning TRUE DMM is done and buffer is ready to be read FALSE DMM is not ready Negative Value Error code Example double Buffer 10 DMMTrigger 0 10 while DMMReady 0 for iz0 i lt 10 i j DMMReadBuffer 0 amp Buffer i Page 154 Operation Manual User Manual 07503800 Model 3800 DMMSetACV
150. the sample program the user must first set the logical address of the DMM to 2 and run the Resource Manager program see Resource Manager sampleVDC exe This sample program demonstrates how to measure DC Voltage with ASCOR DMM This sample program displays a sign on message and proceeds to initialize the the DMM After a successful initialization the program prompts the user to type a selection character followed by an Enter key The available selection characters are M for DC Voltage measurement and Q for exiting the program sampleMeasurement ex This sample program displays a sign on message and proceeds to initialize the DMM After a successful initialization the program shows the selection list and prompts the user to type a selection character followed by an Enter key The available selection characters are A for selecting VAC mode D for selecting VDC mode F for selecting Frequency mode for selecting Period mode for selecting 2 wire Resistance mode and Q for exiting the program If you select any of selection characters for selecting mode operation excepting character then the program again prompts the user to type a selection character followed by an Enter key The available selection characters are M for measurement S for stopping and going back to the selection list and for exiting the program These sample programs are located in C Vxipnp Winxx as3801 folder N
151. top and return to the Enter to M and press the S and press the Q and press th xit the program nter to select VDC mode Enter to measure DC Voltage the Enter to stop and return to Enter to and press the En M and press the S and press the xit the program ter to select Frequency mode Enter to measure Frequency Enter to stop and return to the Q and press th and press the En M and press the S and press the Enter to exit the program ter to select Period mode Enter to measure Period Enter to stop and return to the Enter to Q and press th and press the En M and press the S and press the Q and press th xit the program ter to select 2 wire Resistance Enter to stop and return to the Enter to and press the En xit the program ter to xit the program selection list selection list selection list selection list mode Enter to measure 2 wire Resistance selection list REQUIRED FILES FOR COMPILING LINKING AND EXECUTION ASCOR provides files to help users who wish to create their own programs for controlling ASCOR DMM 1004 1005 Different files are used for Page 22 Operation Manual User Manual 07503800 Model 3800 compiling linking and execution The following header files are required for compiling as3801 h and asl005 h The following library files are required for linking as380
152. ual 07503800 Model 3800 4 12 2 AC Voltage Source The AC voltage source is fully isolated It has two modes of operation fast settling or closed loop In the ClosedLoop mode the source voltage is monitored and corrections are made to the composite 16 bit DAC at a rate proportional to the set measurement rate A 10 rps or lower reading rate is recommended for the ClosedLoop mode The ClosedLoop mode offers the best accuracy In the fast settling mode the source voltage is monitored and can be displayed but no DAC adjustments are made Both amplitude and frequency can be set The frequency range is 2 Hz to 75 kHz and the amplitude is up to 20 V peak to peak with 10 mA maximum peak current drive The output impedance is approximately 250 ACV Measure LO 25A MAX LAWO TRIG GUARD Trig 6W Q GUARD Figure 4 11 Generating AC voltage The figure indicates the internal monitoring of the output in closed loop operation 4 12 3 DC Current Source The MODEL 1005 has a fully isolated unipolar DC current source with five ranges It uses the 12 bit DAC to control current level This source function is useful for parametric component measurements as well as for system verification and calibration where a precise DC current is necessary to calibrate current sensing components For improved resolution of the current source use the Trim DAC It has to be set separately since it is not included in the calibration record or th
153. ue Error code Example char cBuf 64 int status DMMGetMaxStr 0 cBuf Page 120 Operation Manual User Manual 07503800 Model 3800 DMMGetMin MODEL 1004 MODEL 1005 Description Get the minimum reading history int DMMGetMin int double FAR pdMin Remarks This function returns a double floating value that is the minimum of the Min Max function value since either a function change range change or a call to the DMMClearMinMax function was made This is only applicable to Primary read functions those that are read using DMMRead DMMReadStr or DMMReadNorm This value is updated every time one of those functions is used Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero IpdMin double FAR Pointer where the Min value is to be saved Return Value Integer error code Value Meaning DMM OKAY Operation successfully completed Negative Value Error code Example double FAR Min int status DMMGetMin 0 amp Min Page 121 Operation Manual User Manual 07503800 Model 3800 DMMGetMinStr MODEL 1004 MODEL 1005 Description Returns the minimum as a formatted string int DMMGetMinStr int nDmm LPSTR pszReading Remarks This function is the string version of DMMGetMin It returns the result as a string formatted for printing The print format is determined by the range and function See DMMGetMin for more details Parameter Type Descriptio
154. unctions etc Note All of the controls described below correspond to their respective software function which can be invoked within your control software or as objects in a visual programming environment The software command language of the DMM provides a powerful set of capabilities Some of the functions are not included in the control panel but are in the software Source The source buttons control the type of measurement being performed The source selections are as follows VDC DC Volts VAC AC Volts FREQ Frequency PER Period 2W lt Two Wire Resistance 4W Four Wire resistance TEMP Temperature Range Can be set to AutoRange or manual by clicking on the appropriate range in the lower part of the Windows panel Autoranging is best used for bench top application and is not recommended for an automated test application due to the uncertainty of the DMM range as well as the extra time for range changes Locking a range is highly Page 69 Operation Manual User Manual 07503800 Model 3800 recommended when operating in an automated test system especially to speed up measurements Another reason to lock a range is to control the input impedance in DCV The 330 mV and 3 3 V ranges have virtually infinite input impedance while the 33 V and 330 V ranges have 10 MO input impedance Auto Update Measurement When this function is OFF the DMM retains the last reading When this function is ON new readings are taken and
155. ured The minimum positive or negative pulse width of the signal must be at least greater than 2 us When measuring duty cycle precisely the voltage at which the measurement is made is important due to finite slew rates of the signal With the and MODEL 1005 the Threshold voltage can be set for precise control of the level at which duty cycle is measured For best measurement results set the Threshold DAC to the Median value This is particularly important for signals with low duty cycle and small amplitude relative to the selected scale Page 86 Operation Manual User Manual 07503800 Model 3800 4 11 4 Pulse Width User selectable positive or negative pulse widths may be measured for signal freguencies of 1 Hz to 100 kHz anda minimum pulse widths of 2 us The Threshold DAC feature allows measurements at a pre defined signal level See Threshold DAC above for more details To measure pulse width the DMM must be in the AC volts range appropriate for the input voltage Keeping the peak to peak amplitude of the measured signal below 5 75 times the set range will guarantee the signal is within the linear region of the AC circuitry and gives the best performance 4 11 5 Totalizer The totalizer can be selected while the DMM is in the ACV mode It is capable of counting events such as over voltage excursions switch closures decaying resonance count etc The active edge polarity can be set for a positive or negative transition A count o
156. utoRange as1005 DMMsSetBufflrigRead DMMSetBuffTrigRead as1005_DMMSetCapsMeasure DMMSetCapsMeasure as1005_DMMSetCompThreshold DMMSetCompThreshold as1005 DMMSetCounterkng DMMSetCounterRng as1005 DMMSetDClISource DMMSetDCISource as1005 DMMSetDCVSource DMMSetDCVSource as1005 DMMSetFuncRange DMMSetFunckange as1005 DMMsSetFunction DMMSetFunction as1005 DMMSetlnductFreg DMMsSetInductFreq as1005 DMMSetRange DMMSetRange as1005 DMMSetRate DMMSetRate as1005 DMMSetRelative DMMSetRelative as1005 DMMSetRTD DMMSetRTD as1005 DMMSetSourceMode DMMSetSourceMode as1005 DMMSetSynchronized DMMSetSynchronized as1005 DMMSetTempUnits DMMSetTemp Units as1005 DMMSetTrigRead DMMSetTrigRead Page 96 Operation Manual User Manual 07503800 Model 3800 VXI PLUG amp PLAY DMM DRIVER DMM NATIVE DRIVER FUNCTIONS FUNCTIONS as1005 DMMSetTrimDAC DMMSetTrimDAC as1005 DMMStartTotalizer DMMStartTotalizer 51005 DMMStopTotalizer DMMStopTotalizer as1005 DMMTerminate DMMTerminate as1005 DMMTrigger DMMTrigger as1005 DMMWidthStr DMM WidthStr Page 97 Operation Manual User Manual 07503800 Model 3800 DMMArmAnalogTrigger MODEL 1004 MODEL 1005 Description Arm DMM for analog level trigger operation int DMMArmaAnalogTrigger int nDmm int iSamples double FAR dThresh Remarks This function is usable for VDC VAC Ohms IAC and IDC Setup the MODEL 1004 for analog level trigger operation Following recepti
157. w Page 136 Operation Manual User Manual 07503800 Model 3800 DMMPolledReadCmd MODEL 1004 MODEL 1005 Description Send DMM Polled Read command int DMMPolledReadCmd int nDmm Remarks If the DMM is not busy with a prior Polled read process this function will trigger the DMM to execute a single read command The DMM must be set to a specific range and one of the following functions to use the polled read command VDC VAC IDC IAC 2 wire 4 wire 6 wire or RTD function Composite functions such as Capacitance Inductance Peak to Peak etc are not capable of polled read operation Measurement rate must be 10 rps or higher If FALSE is returned the DMM is busy processing a prior polled read A DMM OKAY indicates the DMM accepted the read command and entered the busy state The DMM remains busy until it is ready with the next reading This function is useful where it is necessary to conserve CPU time and make the DMM a polled device Use DMMPolledRead or DMMPolledReadStr to test for readiness and read measurement Do not use DMMReady to check for readiness since it will cause communication failure Parameter Type Description nDmm int Identifies the DMM DMMs are numbered starting with zero Return Value DMM OKAY if command accepted else FALSE or an error code Value Meaning FALSE DMM is busy and can t execute a polled read command DMM_OKAY Operation successful DMM entered busy state Negative Value Error code Exam

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