2. Connect the NI 9224 to the calibrator as shown in the following figure.
Figure 1.
Accuracy Verification Connections
NI 9224
AI0–
+
Calibrator
AI0+
–
AI1–
AI1+
AI7–
AI7+
Note
The chassis ground lug connection to ground is the NI 9224 ground
connection.
3. Set the calibrator voltage to a Test Point value indicated in the
NI 9224 Verification Test
Limits
table.
4. Set the calibrator to Operate mode (OPR).
5. Acquire and average samples for each channel.
a) Create and configure an AI voltage task according to the following
NI 9224
Accuracy Verification Configuration
table.
Table 2.
NI 9224 Accuracy Verification Configuration
Minimum (V) Maximum (V) Scaled Units
Physical Channels
Channel
Configuration
-10
10
Volts
cDAQ1Mod8/AI0:AI7 Differential
b) Configure the task timing according to the following
NI 9224 Timing Configuration
table.
Table 3.
NI 9224 Timing Configuration
Sample Mode
Samples Per Channel
Rate (kS/s)
Finite Samples
100
1
c) Start the task.
d) Read the samples from the NI 9224.
e) Average the samples for each AI channel and record the average.
f) Stop and clear the task.
6. Set the calibrator to Standby mode (STBY).
7. Compare the averaged samples to the limits in the
NI 9224 Verification Test Limits
table
to verify the input accuracy. If the value is within these limits, the device passes the test.
8. Repeat steps 3 through 7 for each test point in the
NI 9224 Verification Test Limits
table.
9. Disconnect the calibrator from the device.
4
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NI 9224 Calibration Procedure
Содержание 9224
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