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322614f.qxp 11/23/2004 10:13 AM Page 1
QUICK REFERENCE
™
NI-DMM Instrument Driver
Initialize and Close
1
ICON TYPE PARAMETER VALUE TO SET, COMMENTS
2
niDMM Initialize
(niDMM_init)
Creates a new session to the instrument.
ViRsrc resourceName For Traditional NI-DAQ devices, use DAQ::#,
where # is the device number.
For NI-DAQmx devices, the device name is
assigned by Measurement & Automation
Explorer (MAX). Optionally, for all devices
you can use an IVI logical name.
ViBoolean IDQuery NID
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322614f.qxp 11/23/2004 10:13 AM Page 2 Initialize and Close (continued) ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Close (niDMM_close) Closes the current session to the instrument. ViSession vi Session handle Configure ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Configure Measurement Digits (niDMM_ConfigureMeasurementDigits) Configures the common properties of the measurement. ViSession vi Session handle ViInt32 Function DC volts, AC volts, and so on ViReal64 Range ViReal64 Resolut
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322614f.qxp 11/23/2004 10:13 AM Page 3 Measurement Options (continued) ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Configure Auto Zero (niDMM_ConfigureAutoZeroMode) Configures the DMM for Auto Zero. ViSession vi Session handle ViInt32 AutoZero Default = Auto niDMM Configure ADC Calibration (niDMM_ConfigureADCCalibration) Allows the NI 4070/4071/4072 to compensate for gain drift since the last external or self-calibration. ViSession vi Session handle ViInt32 ADC Calibration Default = Aut
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322614f.qxp 11/23/2004 10:13 AM Page 4 Capacitance and Inductance ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Configure Cable Comp Type (niDMM_ConfigureCableCompType) Sets the Cable Compensation Type property for the current capacitance/inductance mode range on the NI 4072. ViSession vi Session handle ViInt32 Cable Comp Type niDMM Configure Open Cable Comp Values (niDMM_OpenCableCompValues) Configures the Open Cable Comp Conductance and Open Cable Comp Susceptance properties on the NI 4
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322614f.qxp 11/23/2004 10:13 AM Page 5 Triggers ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Configure Trigger (niDMM_ConfigureTrigger) Configures the DMM trigger source and trigger delay. ViSession vi Session handle ViInt32 Trigger Source Default = Immediate ViReal64 Trigger Delay Default = Auto niDMM Send Software Trigger (niDMM_SendSoftwareTrigger) Sends a command to trigger the DMM. ViSession vi Session handle niDMM Configure Trigger Slope (niDMM_ConfigureTriggerSlope) Sets the Trigge
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322614f.qxp 11/23/2004 10:13 AM Page 6 Actual Values ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Get Auto Range Value (niDMM_GetAutoRangeValue) Returns the actual range that the DMM is using, even when auto ranging is off. ViSession vi Session handle ViReal64* autoRange Value Output niDMM Get Aperture Time Info (niDMM_GetApertureTimeInfo) Returns the aperture time and aperture time units. ViSession vi Session handle ViReal64* Aperture Time Output ViInt32* Aperture Time Output (seconds or
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322614f.qxp 11/23/2004 10:13 AM Page 7 Acquisition (continued) ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Read Waveform (niDMM_ReadWaveform) Acquires a waveform and returns an array representing the digitized waveform on the NI 4070/4071/4072. ViSession vi Session handle ViInt32 Maximum Time Milliseconds ViInt32 Number to Read Default = 1 ViReal64[]* Waveform Data Output ViInt32* Actual Number Output niDMM Is Over Range (niDMM_IsOverRange) Takes a measurement value and determines if the
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322614f.qxp 11/23/2004 10:13 AM Page 8 Low-Level Acquisition (continued) ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Fetch Waveform (niDMM_FetchWaveform) Acquires an array of data from a waveform on the NI 4070/4071/4072. ViSession vi Session handle ViInt32 Maximum Time Milliseconds ViInt32 Number to Fetch Default = 1 ViReal64[ ]* Waveform Data Output ViInt32* Actual Number Output niDMM Read Status (niDMM_ReadStatus) Returns measurement backlog and acquisition status on the NI 4060 and
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322614f.qxp 11/23/2004 10:13 AM Page 9 Utility (continued) ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Format Measurements Absolute (niDMM_FormatMeasAbsolute) Formats the measurement to the proper number of displayed digits. ViInt32 Function DC volts, AC volts, and so on ViReal64 Range Input ViReal64 Resolution Input ViReal64 Measurement Input ViChar [ ] Mode String Output ViChar [ ] Range String Output ViChar [ ] Data String Output niDMM Get Digits Of Precision (niDMM_GetDigitsOfPrecisi
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322614f.qxp 11/23/2004 10:13 AM Page 10 Calibration (continued) ICON TYPE PARAMETER VALUE TO SET, COMMENTS niDMM Get Dev Temp (niDMM_GetDevTemp) Returns the current temperature of the NI 4070/4071/4072. ViSession vi Session handle ViString Reserved " " ViReal64* Temperature Output niDMM Get Last Cal Temp (niDMM_GetLastCalTemp) Returns the temperature during the last calibration procedure on the NI 4070/4071/4072. ViSession vi Session handle ViInt32 Area Default = Internal ViReal64* Temperatu
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322614f.qxp 11/23/2004 10:13 AM Page 11 DMM Programming Flow © © National Instruments Corporation National Instruments Corporation 11 NI-DMM Instrument Driver Quick Reference Close Initialize Configure Hardware Read Session Initiate/Fetch
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