National Instruments NI PXI-5422 Adjusting the Calibration ADC

c. Call niFgen_InitiateGeneration (niFgen Initiate

Generation VI) to initiate the waveform generation using

the following parameter:

•vi: The session handle returned from niFgen_InitExtCal

d. Measure the frequency of the generated waveform. This value is

the measured frequency.

14. Call niFgen_AbortGeneration (niFgen Abort Generation VI) to

abort the waveform generation using the following parameter:

•vi: The session handle returned from niFgen_InitExtCal

Adjusting the Calibration ADC

The NI PXI-5422 has an onboard calibration ADC that is used during

self-calibration. Adjusting the calibration ADC involves characterizing the

gain and offset associated with this ADC so that performing self-calibration

results in an accurately calibrated device.

1. Call niFgen_InitializeCalADCCalibration (niFgen Initialize

Cal ADC Calibration VI) using the following parameter:

•vi: The session handle returned from niFgen_InitExtCal

2. Call niFgen_WriteBinary16AnalogStaticValue (niFgen Write

Binary 16 Analog Static Value VI) to set the main DAC value using

the following parameters:

•vi: The session handle returned from niFgen_InitExtCal

•channelName: "0"

•value: 0

3. Call niFgen_SetAttributeViInt32 to set the analog path value

(niFgen property node: Output Attributes»Analog Path) using the

following parameters:

•vi: The session handle returned from niFgen_InitExtCal

•channelName: "0"

•attributeID: NIFGEN_ATTR_ANALOG_PATH

•value: NIFGEN_VAL_FIXED_LOW_GAIN_ANALOG_PATH

4. Call niFgen_SetAttributeViInt32 to set the gain DAC value

(niFgen property node: Calibration»Gain DAC Value) using the

following parameters:

•vi: The session handle returned from niFgen_InitExtCal

•channelName: "0"

•attributeID: NIFGEN_ATTR_GAIN_DAC_VALUE

•value: 1700