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National Instruments Corporation
7
NI 9205/9206 Calibration Procedure
Verification Procedure
Verification determines how well the device is meeting its specifications.
By completing this procedure, you can see how the device has drifted over
time, which helps you determine the appropriate calibration interval for
your application. Table 4 in the
Device Test Limits
section shows all
acceptable settings for the device type. Throughout the verification process,
use Table 4 to determine if the device is operating within its specified range
prior to calibration. Because the NI 9205/9206 has many different ranges,
you must verify measurements for each available range on these modules.
Complete the following steps to test the performance of the device:
1.
Refer to Table 1 for a list of the NI connection accessories for the
NI 9205/9206 and instructions on connecting the calibrator to the
device.
2.
Set the calibrator voltage to the Test Point value indicated in Table 4.
NI recommends that you verify all values, although you can save time
by verifying only the values used in your application.
3.
If you use C function calls, create a task using
DAQmxCreateTask
, as
shown in the following table. If you use LabVIEW, skip this step. The
task is created in step 4 in LabVIEW.
Table 1.
NI Connection Accessories
Device
Connection Accessory
Connection Instructions
NI 9205/9206
NI 9940 36-position strain
relief & high voltage connector
kit
Connect the positive output of the calibrator to
AI0 (pin 1) and the negative output of the
calibrator to AI8 (pin 19) and COM (pin 17). If
the calibrator has a guard connection, connect
that terminal to COM instead of connecting
COM to the negative output.
NI 9205 with
DSUB
NI 9933 37-pin connector kit,
screw terminal connector and
DSUB shell
Connect the positive output of the calibrator to
AI0 (pin 1) and the negative output of the
calibrator to AI8 (pin 20) and COM (pin 10). If
the calibrator has a guard connection, connect
that terminal to COM instead of connecting
COM to the negative output.
NI-DAQmx Function Call
LabVIEW Block Diagram
Call
DAQmxCreateTask
with the
following parameters:
taskName
:
AIVerificationTask
taskHandle
:
&taskHandle
LabVIEW does not require this step.
