8.
Repeat steps 3 through 7 for each test point in the
NI 9252 Verification Test Limits
table.
9.
Disconnect the calibrator from the device.
Table 4. NI 9252 Verification Test Limits
Test Points
2-Year Limits
Location
Value (VDC)
Lower Limit (VDC)
Upper Limit (VDC)
Min
-10.0000
-10.0166
-9.9834
Mid
0.0000
-0.0026
0.0026
Max
10.0000
9.9834
10.0166
Note
The test limits listed in the
NI 9252 Verification Test Limits
table are derived
using values from the
NI 9252 Accuracy Under Calibration Conditions
table.
Adjustment
The following performance adjustment procedure describes the sequence of operation required
to adjust the NI 9252.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9252.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9252 to the calibrator as shown in the
Accuracy Verification
section.
3.
Adjust the NI 9252.
a)
Initialize a calibration session on the NI 9252. The default password is
NI
.
b)
Input the external temperature in degrees Celsius.
c)
Call the NI 9252 get C Series adjustment points function to obtain an array of
recommended calibration voltages for the NI 9252.
d)
Set the calibrator to a reference value determined by the array of recommended
calibration voltages.
e)
Set the calibrator to Operate mode (OPR).
f)
Call and configure the NI 9252 adjustment function according to
NI 9252
Adjustment Configuration
table.
Table 5. NI 9252 Adjustment Configuration
Physical Channel
Reference Value
cDAQ1Mod8/AI0:7
The actual value of the voltage output of the calibrator
Note
The module acquisition is started each time the adjust function is
called. There is a delay of approximately 550 µs from the acquisition start
until module data becomes available.
NI 9252 Calibration Procedure
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© National Instruments Corporation
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