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6.
Compare the per-channel averages to the limits in Table 4.
7.
Set the calibrator to Standby mode (STBY).
8.
Repeat steps 3 through 7 for each test point in Table 4.
9.
Disconnect the calibrator from the device.
Table 4. NI 9225 Verification Test Limits for Accuracy
Range
Min
Max
(V
)
(V
rms
rms
-300
300
Note
The test limits listed in Table 4 are derived using the values in Table 17.
Gain Matching Verification
Complete the following procedure to determine the As-Found status of the NI 9225.
1.
Connect the NI 9225 to the function generator as shown in Figure 2.
2.
Configure function generator according to Table 5.
Table 5. Function Generator Configuration for Gain Matching Verification
Signal Type
Sinewave
6 | ni.com | NI 9225 Calibration Procedure
Test Point
)
Location
Max
Mid
Min
Figure 2. Gain Matching Verification Connections
HI
LO
Function
Generator
Amplitude (V
Value
Lower Limit
(V
)
(V
DC
403.75
403.431250
0.00
-0.052275
-403.75
-404.068750
+
AI0
–
+
AI1
–
+
AI2
–
NI 9225
)
pk
9
1-Year Limits
Upper Limit
)
(V
DC
DC
404.068750
0.052275
-403.431250
Frequency (kHz)
20
)
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