National Instruments Instrument Driver NI-DMM Manuale utente

QUICK REFERENCE

NI-DMM Instrument Driver

Initialize and Close

ICON TYPE PARAMETER VALUE TO SET, COMMENTS1

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 NIDMM_VAL_TRUE

NIDMM_VAL_FALSE

ViBoolean resetDevice NIDMM_VAL_TRUE

NIDMM_VAL_FALSE

ViSession* vi Reference to new session handle

ViRsrc resourceName ForTraditional 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 NIDMM_VAL_TRUE

NIDMM_VAL_FALSE

ViBoolean resetDevice NIDMM_VAL_TRUE

NIDMM_VAL_FALSE

ViString Option String Simulate = 0, RangeCheck = 1

QueryInstrStatus = 1, Cache = 1

ViSession* vi Reference to new session handle

niDMM Initialize with Options

(niDMM_InitWithOptions)

Creates a new session to the instrument and optionally sets the initial state of

session properties.

niDMM Initialize2

(niDMM_init)

Creates a new session to the instrument.

™

1 In LabWindows™/CVI™, C, and C++, constant names such as NIDMM_VAL_TRUE and

NIDMM_VAL_AUTO_ZERO_ON refer to the use of #defines in your program. In LabVIEW, these constants

refer to Boolean or ring controls with corresponding entries. For example, NIDMM_VAL_AUTO_ZERO_ON

corresponds to the LabVIEW ring control entry Auto Zero On. Refer to LabVIEW Help (Show Help) for

more details.

2 Function name for LabWindows/CVI, C, C++, and Visual Basic.

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2 ni.com

Initialize and Close (continued)

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

Configure

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 Function DC volts, AC volts, and so on

ViReal64 Range

ViReal64 Resolution in Digits

ViSession vi Session handle

ViInt32 Trigger Count Default = 1

ViInt32 Sample Count Default = 1

ViInt32 Sample Trigger Immediate, External, TTL0, and so on

ViReal64 Sample Interval Default = Auto

ViSession vi Session handle

ViInt32 Function Voltage Waveform, Current Waveform

ViReal64 Range

ViReal64 Rate

ViInt32 WaveformPoints

Measurement Options

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViReal64 Powerline Default = 60 Hz

Frequency

niDMM Configure Powerline Frequency

(niDMM_ConfigurePowerLineFrequency)

Specifies the powerline frequency.

niDMM Configure Waveform Acquisition

(niDMM_ConfigureWaveformAcquisition)

Configures the NI 4070/4071/4072 for waveform acquisitions.

niDMM Configure Multi Point

(niDMM_ConfigureMultiPoint)

Configures the properties for multipoint measurements.

niDMM Configure Measurement Digits

(niDMM_ConfigureMeasurementDigits)

Configures the common properties of the measurement.

niDMM Close

(niDMM_close)

Closes the current session to the instrument.

NI-DMM Instrument Driver Quick Reference

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Measurement Options (continued)

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 AutoZero Default = Auto

ViSession vi Session handle

ViInt32 ADC Calibration Default = Auto

ViSession vi Session handle

ViInt32 Offset Compensated Default = Off

Ohms

ViSession vi Session handle

ViReal64 Minimum Frequency Hz

ViReal64 Maximum Frequency Hz

ViSession vi Session handle

ViReal64 Frequency Voltage Default = AutoRange

Range

ViSession vi Session handle

ViReal64 Current Source Default = 1.00 mA

ViSession vi Session handle

ViInt32 Waveform AC or DC

Coupling

niDMM Configure Waveform Coupling

(niDMM_ConfigureWaveformCoupling)

Configures instrument coupling for voltage waveforms on the NI 4070/4071/4072.

niDMM Configure Current Source

(niDMM_ConfigureCurrentSource)

Configures the current source for diode measurements on the NI 4070/4071/4072.

niDMM Configure Frequency Voltage Range

(niDMM_ConfigureFrequencyVoltageRange)

Specifies the expected maximum amplitude of the input signal for frequency and

period measurements on the NI 4070/4071/4072.

niDMM Configure AC Bandwidth

(niDMM_ConfigureACBandwidth)

Configures the Min Frequency and Max Frequency properties that the DMM uses

for AC measurements.

niDMM Configure Offset Comp Ohms

(niDMM_ConfigureOffsetCompOhms)

Allows the NI 4070/4071/4072 to compensate for voltage offsets in resistance

measurements.

niDMM Configure ADC Calibration

(niDMM_ConfigureADCCalibration)

Allows the NI 4070/4071/4072 to compensate for gain drift since the last external or

self-calibration.

niDMM Configure Auto Zero

(niDMM_ConfigureAutoZeroMode)

Configures the DMM for Auto Zero.

National Instruments Corporation 3 NI-DMM Instrument Driver Quick Reference

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4 ni.com

Capacitance and Inductance

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 Cable Comp Type

ViSession vi Session handle

ViReal64 Conductance

ViReal64 Susceptance

ViSession vi Session handle

ViReal64 Resistance

ViReal64 Reactance

ViSession vi Session handle

ViInt32 Max Time

ViReal64 Conductance

ViReal64 Susceptance

ViSession vi Session handle

ViInt32 Max Time

ViReal64 Resistance

ViReal64 Reactance

niDMM Perform Short Cable Comp

(niDMM_PerformShortCableComp)

Performs the short cable compensation measurements and returns short cable

compensation resistance and reactance values on the NI 4072.

niDMM Perform Open Cable Comp

(niDMM_PerformOpenCableComp)

Performs the open cable compensation measurements and returns open cable

compensation conductance and susceptance values on the NI 4072.

niDMM Configure Short Cable Comp Values

(niDMM_ConfigureShortCableCompValues)

Configures the Short Cable Comp Resistance and Short Cable Comp Reactance

properties on the NI 4072.

niDMM Configure Open Cable Comp Values

(niDMM_OpenCableCompValues)

Configures the Open Cable Comp Conductance and Open Cable Comp Susceptance

properties on the NI 4072.

niDMM Configure Cable Comp Type

(niDMM_ConfigureCableCompType)

Sets the Cable CompensationType property for the current capacitance/inductance

mode range on the NI 4072.

NI-DMM Instrument Driver Quick Reference

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5 NI-DMM Instrument Driver Quick Reference

Triggers

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 Trigger Source Default = Immediate

ViReal64 Trigger Delay Default = Auto

ViSession vi Session handle

ViInt32 Trigger Slope

ViSession vi Session handle

ViInt32 Slope

ViSession vi Session handle

ViInt32 Measurement Default = None

Complete

Destination

ViSession vi Session handle

ViInt32 Slope

niDMM Configure Meas Complete Slope

(niDMM_ConfigureMeasCompleteSlope)

Sets the MC signal to either rising edge or falling edge polarity.

niDMM Configure Meas Complete Dest

(niDMM_ConfigureMeasCompleteDest)

Specifies the destination of the Measurement Complete (MC) signal.

niDMM Configure Sample Trigger Slope

(niDMM_ConfigureSampleTriggerSlope)

Sets the SampleTrigger Slope property to either rising edge or falling edge polarity.

niDMM Configure Trigger Slope

(niDMM_ConfigureTriggerSlope)

Sets theTrigger Slope property to either rising edge or falling edge polarity.

niDMM Send Software Trigger

(niDMM_SendSoftwareTrigger)

Sends a command to trigger the DMM.

niDMM Configure Trigger

(niDMM_ConfigureTrigger)

Configures the DMM trigger source and trigger delay.

National Instruments Corporation

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NI-DMM Instrument Driver Quick Reference 6 ni.com

Actual Values

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViReal64* autoRange Value Output

ViSession vi Session handle

ViReal64* Aperture Time Output

ViInt32* ApertureTime Output (seconds or PLC)

Units

ViSession vi Session handle

ViReal64* Measurement Output (seconds)

Period

Acquisition

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 Maximum Time Milliseconds

ViReal64* Measurement Output

ViSession vi Session handle

ViInt32 Maximum Time Milliseconds

ViInt32 Number to Read Default = 4

ViReal64 [ ] Measurements Output

ViInt32* Actual Number Output

niDMM Read Multi Point

(niDMM_ReadMultiPoint)

Acquires multiple measurements and returns an array of measured values.

niDMM Read

(niDMM_Read)

Acquires a single measurement and returns the measured value.

niDMM Get Measurement Period

(niDMM_GetMeasurementPeriod)

Returns the measurement period, which is the amount of time it takes to complete

one measurement with the current configuration.

niDMM Get Aperture Time Info

(niDMM_GetApertureTimeInfo)

Returns the aperture time and aperture time units.

niDMM Get Auto Range Value

(niDMM_GetAutoRangeValue)

Returns the actual range that the DMM is using, even when auto ranging is off.

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Acquisition (continued)

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 Maximum Time Milliseconds

ViInt32 Number to Read Default = 1

ViReal64[]* Waveform Data Output

ViInt32* Actual Number Output

ViSession vi Session handle

ViReal64 Measurement Input

ViBoolean* Over range? Output

Low-Level Acquisition

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 Maximum Time Milliseconds

ViReal64* Measurement Output

ViSession vi Session handle

ViInt32 Maximum Time Milliseconds

ViInt32 Number to Fetch Default = 4

ViReal64[ ] Measurements Output

ViInt32* Actual Number Output

niDMM Fetch Multi Point

(niDMM_FetchMultiPoint)

Returns an array of values from a previously initiated multipoint measurement.

niDMM Fetch

(niDMM_Fetch)

Returns the value from a previously initiated measurement.You must call

niDMM Initiate before calling this VI.

niDMM Initiate

(niDMM_Initiate)

Initiates an acquisition.

niDMM Is Over Range

(niDMM_IsOverRange)

Takes a measurement value and determines if the value is a valid measurement or a

value indicating that an overrange condition occurred.

niDMM Read Waveform

(niDMM_ReadWaveform)

Acquires a waveform and returns an array representing the digitized waveform on

the NI 4070/4071/4072.

National Instruments Corporation 7 NI-DMM Instrument Driver Quick Reference

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Low-Level Acquisition (continued)

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 Maximum Time Milliseconds

ViInt32 Number to Fetch Default = 1

ViReal64[ ]* Waveform Data Output

ViInt32* Actual Number Output

ViSession vi Session handle

ViInt32* Backlog Output

ViInt16* Acquisition State Output

ViSession vi Session handle

Utility

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt16* Self Test Result Output

ViChar [ ] SelfTest Message Output

ViSession vi Session handle

ViChar [ ] Instrument Driver Output

Revision

ViChar [ ] Firmware Revision Output

niDMM Revision Query

(niDMM_revision_query)

Returns the revision numbers of the instrument driver and instrument firmware.

niDMM Self Test

(niDMM_self_test)

Performs a self-test on the DMM to ensure that the DMM is functioning properly.

niDMM Reset

(niDMM_reset)

Resets the instrument to a known state and sends initialization commands to the

instrument.

niDMM Abort

(niDMM_Abort)

Aborts a previously initiated measurement and returns the DMM to the Idle state.

niDMM Read Status

(niDMM_ReadStatus)

Returns measurement backlog and acquisition status on the NI 4060 and

NI 4070/4071/4072.

niDMM Fetch Waveform

(niDMM_FetchWaveform)

Acquires an array of data from a waveform on the NI 4070/4071/4072.

NI-DMM Instrument Driver Quick Reference 8 ni.com

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Utility (continued)

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

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

ViSession vi Session handle

ViReal64* Digits Output (3.5/4.5/5.5/6.5)

ViSession vi Session handle

ViBoolean Message Box Default = Do not show dialog

(Only applies to LV)

ViStatus* Error Code Input/Output

ViChar [ ] Error Message Output

Calibration

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViInt32 Area Default = Internal

ViInt32* Count Output

niDMM Get Cal Count

(niDMM_GetCalCount)

Returns the calibration count for the specified type of calibration.

niDMM Self Cal

(niDMM_SelfCal)

Executes the self-calibration routine to maintain measurement accuracy on the

NI 4070/4071/4072.

niDMM Error Message

(niDMM_error_message)

Takes the error cluster returned by the VIs, interprets it, and returns it as a

user-readable string.

niDMM Get Digits Of Precision

(niDMM_GetDigitsOfPrecision)

Returns the digits of precision calculated from the range and resolution information

specified in niDMM Configure Measurement.

niDMM Format Measurements Absolute

(niDMM_FormatMeasAbsolute)

Formats the measurement to the proper number of displayed digits.

NI-DMM Instrument Driver Quick Reference9

National Instruments Corporation

322614f.qxp 11/23/2004 10:13 AM Page 9

Calibration (continued)

ICON TYPE PARAMETER VALUE TO SET, COMMENTS

ViSession vi Session handle

ViString Reserved " "

ViReal64* Temperature Output

ViSession vi Session handle

ViInt32 Area Default = Internal

ViReal64* Temperature Output

ViSession vi Session handle

ViInt32 Area Default = Internal

ViInt32* Month Output

ViInt32* Day Output

ViInt32* Year Output

ViInt32* Hour Output

ViInt32* Minute Output

niDMM Get Cal Date and Time

(niDMM_GetCalDateAndTime)

Returns the date and time of the last calibration performed on the

NI 4070/4071/4072.

niDMM Get Last Cal Temp

(niDMM_GetLastCalTemp)

Returns the temperature during the last calibration procedure on the

NI 4070/4071/4072.

niDMM Get Dev Temp

(niDMM_GetDevTemp)

Returns the current temperature of the NI 4070/4071/4072.

10 ni.com

NI-DMM Instrument Driver Quick Reference

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