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NI 9246/9247 Calibration Procedure
Adjustments
The following performance adjustment procedure describes the sequence of operation required
to adjust the NI 9246/9247.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9246/9247.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9246/9247 to the calibrator as shown in Figure 1.
3.
Adjust the NI 9246/9247.
a.
Initialize a calibration session on the NI 9246/9247. The default password is
NI
.
b.
Input the external temperature in degrees Celsius.
c.
Call the NI 9246/9247 DAQmx Get C Series Calibration Adjustment Points function
to obtain an array of recommended calibration current for the NI 9246/9247.
d.
Set the calibrator to a reference value determined by the array of recommended
calibration currents.
e.
Set the calibrator’s output frequency to 55 Hz.
f.
Set the calibrator to Operate mode (OPR).
g.
Wait at least 45 seconds for the signal to settle.
h.
Call and configure the NI 9246/9247 adjustment function according to Table 5.
Note
To adjust all channels in parallel, use ‘ai0:2’ as the channel name.
i.
Set the calibrator to Standby mode (STBY).
j.
Close and commit the calibration session.
4.
Disconnect the NI 9246/9247 from the calibrator.
EEPROM Update
When an adjustment procedure is completed, the NI 9246/9247
internal calibration memory
(EEPROM) is immediately updated.
If you do not want to perform an adjustment, you can update the calibration date and onboard
calibration temperature without making any adjustments by initializing an external calibration
,
setting the C Series calibration temperature, and closing the external calibration.
Table 5.
Adjustment Configuration
Physical Channel
Reference Value
cDAQMod8/ai
x
The reference value from the array of adjustment points