National Instruments NI 6738, Calibration Procedure

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22 | ni.com | NI 6738/6739 Calibration Procedure
• maxVal :
10.0
• units : DAQmx_Val_Volts
• customScaleName : NULL
5. Call DAQmxStartTask with the following parameter:
• taskHandle : taskHandle
6. Call DAQmxWriteAnalogF64 with the following parameters, using a Test Point from
Table 7, NI 6738/6739 Analog Output Values .
• taskHandle :
taskHandle
• numSampsPerChan :
1
• autoStart :
1
• timeout :
10.0
• dataLayout :
DAQmx_Val_GroupByChannel
• writeArray :
&data
• sampsPerChanWritten :
&samplesWritten
• reserved :
NULL
7. Compare the resulting value shown by the DMM to the upper and lower limits in Table 7,
NI 6738/6739 Analog Output Values . If the value is between these limits, the device passes
the test.
8. Repeat steps 6 and 7 until all of the Test Point values in Table 7, NI 6738/6739 Analog
Output Values , have been tested.
9. Call DAQmxClearTask with the following parameter:
•
taskHandle
: taskHandle
10. Disconnect the DMM from AO 0, and reconnect it to AO 1, making the connections shown
in Table 5, Analog Output Connections .
11. Repeat steps 3 through 10 for all AO channels on the device.
12. Disconnect your DMM from the device.
You have finished verifying the analog output levels on your device.
Counter Verification
NI 6738/6739 devices have only one timebase to verify, so only Counter 0 needs to be checked.
It is not possible to adjust this timebase, so only verification can be performed.
Note Table 8, NI 6738/6739 Counter Values , is based upon the most recent edition
of the specifications document for your device. Refer to the most recent
specifications document online at
ni.com/manuals .
Notice Do not perform analog output verification and counter verification
simultaneously, as the multiple signal connections will produce noise that can affect
measurements.