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NI 9209 Calibration Procedure
6.
Launch Measurement & Automation Explorer (MAX).
7.
Right-click the device name and select
Self-Test
to ensure that the module is working
properly.
Verification
The following performance verification procedures describe the sequence of operation and test
points required to verify the NI 9209 and assumes that adequate traceable uncertainties are
available for the calibration references.
Differential Voltage Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI 9209.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9209 to the calibrator as shown in Figure 1.
Figure 1.
Differential Voltage Accuracy Connections
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 Table 4.
4.
Set the calibrator to Operate mode (OPR).
5.
Acquire and average samples.
a.
Create and configure an AI voltage task on the NI 9209 according to Table 2.
1
Connections when using a calibrator with a guard connection.
2
Connections when using a calibrator with no guard connection.
Table 2.
NI 9209 Configuration for Voltage Accuracy Verification
Input Range
Scaled Units
Terminal Configuration
Min
Max
-10
10
Volts
Differential
NI 9209
C
a
li
b
r
a
tor
AI
x
–
AI
x
+
COM
HI
LO
G
ua
rd
NI 9209
C
a
li
b
r
a
tor
AI
x
–
AI
x
+
COM
HI
LO
1
2
