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PXIe-4330/4331 Calibration Procedure
18. Set the calibrator to output a resistance of 350
Ω
.
19. Save the adjustment constants to the EEPROM using the DAQmx Close External
Calibration VI. This VI also saves the date, time, and temperature of the adjustment to the
onboard memory.
Note
If an error occurs during adjustment, no constants will be written to the
EEPROM.
20. Repeat steps 6 through 19 for every excitation setting you want to adjust.
21. Repeat steps 1 through 20 for every channel you want to adjust.
22. Disconnect the calibrator and DMMs from the module.
The module is now adjusted with respect to your external source. After adjusting the module,
you must reverify the accuracy of the module. To do this, repeat the
section.
Test Limits
Tables 12 through 28 list the test limits that the PXIe-4330/4331 should meet if it has been one
year between calibrations. The following definitions describe how to use the information from
the test limits tables:
•
Calibrator Output
—The
Calibrator Output
is the calibrator resistance output entered for
verification.
•
Nominal Value
—The
Nominal Value
is the approximate value that the module should
read, given the corresponding calibrator output.
•
1-Year Limits
—The
1-Year Limits
column contains the
Upper Limits
and
Lower Limits
for
the test results. That is, when the module is within its 1-year calibration interval, the test
results should fall between these upper and lower limit values.
For accuracy verification,
Upper Limits
and
Lower Limits
are given in units of V/V for
verification and units of
με
for reference.
LabVIEW Block Diagram
NI-DAQmx Function Call
Call
DAQmxCloseExtCal
with
the following parameters:
calHandle
:
calHandle
action
:
DAQmx_Val_Action_Comm
it
