National Instruments RM-4339, Calibration Procedure

Page: 6 / 13

6 | ni.com | RM-4339 Calibration Procedure
3. Create a task to enable SCA shunt calibration.
a.
Create and configure an AI Bridge (V/V) measurement according to the values found
in Table 2.
b. Enable the SCA shunt calibration circuit using the following parameters:
Property Node: DAQmx Channel
AI.Bridge.ShuntCal.Select: A
AI.Bridge.ShuntCalASrc: Built-In
AI.Bridge.ShuntCal.ShuntCalAResistance: 100 k
AI.Bridge.ShuntCal.Enable: True
Note
These properties are located at Analog Input»General Properties»Signal
Conditioning»Bridge»Shunt Cal .
c. Commit the task by calling DAQmx Control Task with the following parameter:
Action: Commit
4. Take a resistance measurement from the DMM and record the result.
5. Compare the result from step 4 to the Upper Limit and Lower Limit values in Table 3. If
the result is between these values, the module passes the test.
6. Clear the task by calling DAQmx Clear Task.
Table 2. AI Bridge Configuration
Configuration Value
Channel Name
Dev1/aix
,
where
x
refers to the channel number.
Measurement Type AI Bridge (V/V)
Voltage Excitation Source Internal
Voltage Excitation Value 3.3
Maximum Value 0.01
Minimum Value -0.01
Units V/V
Bridge Configuration Full
Sample Mode Finite Samples
Sample Clock Rate 100
Samples per Channel 100