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NI 9222/9223 Calibration Procedure
Verification
The following performance verification procedure describes the sequence of operation and test
points required to verify the NI 9222/9223 and assumes that adequate traceable uncertainties are
available for the calibration references.
Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI 9222/9223.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9222/9223 to the calibrator as shown in Figure 1.
Figure 1.
NI 9222/9223 Terminal Assignments
Note
If the calibrator outputs are truly floating, the negative output must be
connected to a quiet earth ground as well as AI- to give the entire system a ground
reference.
3.
Set the calibrator voltage to a Test Point value indicated in Tables 4 or 5.
4.
Set the calibrator to Operate mode (OPR).
5.
Acquire and average samples.
a.
Create and configure an AI voltage task on the NI 9222/9223 according to Table 2.
b.
Configure the AI voltage task timing according to Table 3.
c.
Start the task.
d.
Average the readings.
e.
Clear the task.
Table 2.
NI 9222/9223 Configuration for Accuracy Verification
Min (V)
Max (V)
Scaled Units
Terminal Configuration
-10
10
Volts
Differential
Table 3.
Timing Configuration
Module
Sample Mode
Samples per Channel
Rate
NI 9222
Finite Sample
50 k
500 k
NI 9223
Finite Sample
100 k
1 M
NI 9222/922
3
with
S
crew-Termin
a
l
C
a
li
b
r
a
tor
AI
x
–
AI
x
+
–
+
NI 9222/2
3
with BNC
C
a
li
b
r
a
tor
+
AI
x
–
–
+
