1. Set the calibrator to Standby mode (STBY).
2. Connect the NI 9252 to the calibrator as shown in the following figure.
Figure 1.
Analog Input Verification Connections
NI 9252
Calibrator
AI
x
–
AI
x
+
COM
HI
LO
Guard
NI 9252
Calibrator
AI
x
–
AI
x
+
COM
HI
LO
1
2
Note
If the calibrator outputs are truly floating, connect the negative output to
a quiet earth ground as well as COM to give the entire system a ground
reference.
3. Set the calibrator voltage to a Test Point value indicated in the
NI 9252 Verification Test
Limits
table.
4. Set the calibrator to Operate mode (OPR).
5. Acquire and average samples.
a) Create and configure an AI voltage channel according to the following
NI 9252 AI
Voltage Task
table.
Table 2.
NI 9252 AI Voltage Task
Physical Channels
Range
Terminal Configuration
cDAQMod8/AI0:7
±10.5 V
Differential
b) Configure the AI voltage channel timing according to the following
NI 9252 Task
Timing
table.
Table 3.
NI 9252 Task Timing
Samples Per Channel
Acquisition Mode
Rate (kS/s)
1000
Finite Samples
50
c) Set the filter frequency to 3125 Hz using the Channel Property (
Analog Input
»
General Properties
»
Digital Filter
»
Notch
»
Center Frequency
).
d) Start the task.
e) Read the samples from the NI 9252.
f) Average the samples.
g) Clear the task.
6. Compare the averaged samples to the limits in the
NI 9252 Verification Test Limits
table
to verify the input accuracy. If the values are within these limits, the device passes the
test.
7. Set the calibrator to Standby mode (STBY).
8. Repeat steps 3 through 7 for each test point in the
NI 9252 Verification Test Limits
table.
4
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NI 9252 Calibration Procedure
Содержание NI-9252
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