NI 6738/6739 Calibration Procedure
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© National Instruments
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11
•
sampsPerChanWritten
:
&samplesWritten
•
reserved
:
NULL
7.
Compare the resulting value shown by the DMM to the upper and lower limits in Table 3,
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 3,
, 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 2,
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 4,
, is based upon the most recent edition
of the specifications document for your device. Refer to the most recent
specifications document online at
Caution
Do not perform analog output verification and counter verification
simultaneously, as the multiple signal connections will produce noise that can affect
measurements.
Complete the following steps to perform checks on the counter of your device.
1.
Connect your counter positive input to CTR 0 OUT/PFI 7/P1.7 (Connector 0, pin 9) and
your counter negative input to D GND PFI 6/7 (Connector 0, pin 42).
2.
Create a task using
DAQmxCreateTask
.
3.
To verify the Counter 0, call
DAQmxCreateCOPulseChanFreq
with the following
parameters:
Note
Throughout the procedure, refer to the NI-DAQmx function call parameters
for the LabVIEW input values.
•
taskHandle
:
taskHandle
•
counter
:
Dev_name/ctr0
•
nameToAssignToChannel
:
CounterOutputChannel
•
units
:
DAQmx_Val_Hz
