4
|
ni.com
|
RM-4339 Calibration Procedure
Connecting the Calibrator to the RM-4339
Caution
Always have the NI PXI Express chassis powered off when inserting a
module into the chassis.
Refer to the specific verification procedure section for information describing the required
connections.
Note
To minimize the number of verification connection changes, the connections
for SCA shunt calibration resistance verification and quarter-bridge shunt calibration
verification can be made simultaneously.
The RM-4339 provides support for up to three NI PXIe-4339 modules. The 96-pin DIN
connectors used to connect the NI PXIe-4339 to the RM-4339 through the SH96-96-2 cable are
located on the rear of the RM-4339 and are labeled A, B, and C. To fully verify the RM-4339,
each of the verification procedures in this document must be conducted for each position A, B,
and C. Refer to the
NI PXIe-4339 and RM-4339 User Guide and Terminal Block Specifications
for information about how to install and use the RM-4339.
Test Conditions
The following setup and environmental conditions are required to ensure the RM-4339 meets
published specifications.
•
Keep connections to the RM-4339 as short as possible. Long cables and wires act as
antennas, picking up extra noise that can affect measurements.
•
Verify that all connections are secure.
•
Shielded and twisted pair copper wire is recommended for all cable connections to help
prevent external noise sources from coupling into the measurements.
•
Maintain an ambient temperature of 23 °C ± 5 °C. The offset voltage verification procedure
requires less than 1 °C of ambient temperature variation over the duration of the test. Refer
to
procedure for more details.
•
Keep relative humidity below 80%.
•
Allow a warm-up time for each of the instruments used in this procedure according to the
specific instruments operating instructions.
•
Ensure that the PXI Express chassis fan speed is set to HIGH, that the fan filters are clean,
and that the empty slots contain filler panels. For more information, refer to the
Maintain
Forced-Air Cooling Note to Users
document available at
ni.com/manuals
.
