Operator`s manual

Signametrics 4
4.2 CURRENT MEASUREMENTS ......................................................................................................................25
4.2.1 Improving Current Measurements.........................................................................................26
4.2.2 Low Level DC Current Measurements...................................................................................26
4.2.3 Extended DC Current Measurements (SM2044) ...................................................................26
4.3 RESISTANCE AND LEAKAGE MEASUREMENTS..........................................................................................27
4.3.1 2-Wire Ohm Measurements ...................................................................................................27
4.3.2 4-Wire Ohm Measurements ...................................................................................................27
4.3.3 Using Offset Ohms function...................................................................................................28
4.3.4 6-wire Guarded Resistance Measurement (SM2044) ............................................................28
4.3.5 Leakage Measurements (SM2044).........................................................................................29
4.3.6 Extended Resistance Measurements (SM2044) .....................................................................30
4.3.7 Effects of Thermo-Voltaic Offset............................................................................................31
4.3.8 Guarding High Value Resistance Measurements (SM2044) .................................................31
4.4 RTD TEMPERATURE MEASUREMENT (SM2042, SM2044) ......................................................................32
4.5 INTERNAL TEMPERATURE (SM2042, SM2044)........................................................................................32
4.6 DIODE CHARACTERIZATION .....................................................................................................................33
4.7 CAPACITANCE MEASUREMENT (SM2042, SM2044)................................................................................33
4.8 IN-CIRCUIT CAPACITANCE MEASUREMENT (SM2044) ............................................................................33
4.9 INDUCTANCE MEASUREMENT (SM2044) .................................................................................................34
4.10 CHARACTERISTIC IMPEDANCE MEASUREMENT (SM2044).....................................................................34
4.11 TRIGGER OPERATION .............................................................................................................................34
4.11.1 External Hardware Trigger .................................................................................................34
4.11.2 Analog Threshold Trigger....................................................................................................35
4.11.3 Software Issued Triggered Operations ................................................................................35
4.12 FREQUENCY AND TIMING MEASUREMENTS (SM2042, SM2044)...........................................................35
4.12.1 Threshold DAC ....................................................................................................................35
4.12.2 Frequency and Period Measurements .................................................................................36
4.12.3 Duty Cycle Measurement.....................................................................................................37
4.12.4 Pulse Width..........................................................................................................................37
4.12.5 Totalizer Event Couner........................................................................................................37
4.13 SOURCING FUNCTIONS (SM2044)..........................................................................................................37
4.13.1 DC Voltage Source ..............................................................................................................38
4.13.2 AC Voltage Source...............................................................................................................38
4.13.3 DC Current Source ..............................................................................................................39
4.13.4 Source Current - Measure Voltage......................................................................................39
4.14 SYNTHESIZING RESISTANCE (SM2044)..................................................................................................40
4.15 INTERFACING TO THE SM4040 SERIES RELAY SCANNERS ......................................................................41
4.15.1 Triggering the SM2040 DMMs............................................................................................41
4.15.2 Multiplexing with the SM2040 DMMs.................................................................................42
4.15.3 Interface Commands and Timing.........................................................................................42
4.16 MEASURING TEMPERATURE WITH THERMOCOUPLES ............................................................................43
5.0 WINDOWS INTERFACE..................................................................................................................................44
5.1 DISTRIBUTION FILES ................................................................................................................................44
5.2 USING THE SM2040 DRIVER WITH C++ OR SIMILAR SOFTWARE.............................................................46
Multiple Card Operations Under Windows....................................................................................46
5.3 VISUAL BASIC FRONT PANEL APPLICATION.............................................................................................48
5.3.1 Visual Basic Simple Application............................................................................................48
5.4 WINDOWS DLL DEFAULT MODES AND PARAMETERS..............................................................................50
5.5 USING THE SM2040 DLL WITH LABWINDOWS/CVI® ............................................................................50
5.6 WINDOWS COMMAND LANGUAGE ...........................................................................................................51
DMMArmAnalogTrigger ................................................................................................................51
DMMArmTrigger............................................................................................................................52
DMMBurstBuffRead .......................................................................................................................53
DMMBurstRead..............................................................................................................................54
DMMCalibrate................................................................................................................................55
DMMCleanRelay ............................................................................................................................55
DMMClearMinMax ........................................................................................................................56
DMMClosePCI ...............................................................................................................................56