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Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI 9225.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9225 to the calibrator as shown in Figure 1.
3.
Set the calibrator voltage to a Test Point value indicated in Table 4.
4.
Set the calibrator to Operate mode (OPR).
5.
Acquire and average samples.
a.
Create and configure an AI voltage task according to Table 2.
Table 2. NI 9225 AI Voltage Task Configuration for Phase Matching
Physical Channels
AI0:3
b.
Configure the task timing according to Table 3.
Table 3. NI 9225 Voltage Task Timing Configuration for Phase Matching
Sample Mode
Finite Samples
c.
Start the task.
d.
Read samples from the NI 9225.
e.
Average the samples.
f.
Stop the task.
g.
Clear the task.
Figure 1. Accuracy Verification Connections
HI
LO
Calibrator
Minimum
(V
)
rms
-300
Samples Per Channel
NI 9225 Calibration Procedure | © National Instruments | 5
+
AI0
–
+
AI1
–
+
AI2
–
NI 9225
Maximum
(V
)
rms
300
4167
Terminal
Configuration
Differential
Rate (kS/s)
50
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