NI 9218 Calibration Procedure
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© National Instruments
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g.
Use the DAQmx Close External Calibration to close and commit the calibration
session.
h.
Repeat steps c through g for each channel.
5.
Disconnect the DMM from the NI 9218.
Voltage Accuracy Adjustment, 65 mV mode
Complete the following procedure to adjust the accuracy performance of the NI 9218.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9218 to the calibrator as shown in Figure 4.
3.
Configure the NI 9218 for the NI 9982 measurement adapters using MAX.
4.
Adjust the NI 9218.
a.
Initialize a calibration session on the NI 9218. The default password is
NI
.
b.
Input the external temperature in degrees Celsius using the DAQmx Set Temperature
C Series Calibration function.
c.
Call and configure the DAQmx Setup 9218 Calibration function according to
Table 24.
d.
Call the DAQmx Get 9218 Calibration Adjustment Points function to obtain an array
of recommended calibration voltages for the NI 9218.
e.
Set the calibrator to a reference value determined by the array of recommended
calibration voltages.
f.
Set the calibrator to Operate mode (OPR).
g.
Call and configure the DAQmx Adjust 9218 Calibration function according to
Table 25.
Note
The NI 9218 acquisition starts each time the adjustment function is called.
h.
Set the calibrator to Standby mode (STBY).
i.
Repeat steps e through h for each point in the array of recommended calibration
voltages.
Table 24.
Setup Configuration for 65 mV Accuracy Adjustment
Min (V)
Max (V)
Physical Channels
Measurement Type
-0.065
0.065
cDAQMod8/AI
x
Voltage
Table 25.
Adjustment Configuration
Physical Channel
Reference Value
cDAQMod8/AI
x
The recommended calibration voltage
