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Test Conditions
The following setup and environmental conditions are required to ensure the NI device meets
published specifications.
•
Keep connections to the module as short as possible. Long cables and wires act as antennae,
picking up extra noise that can affect measurements.
•
Use shielded copper wire for all cable connections to the module. Use twisted-pair wire to
eliminate noise and thermal offsets.
•
Maintain an ambient temperature of 23 °C ±5 °C.
•
Keep relative humidity below 80%.
•
Allow a warm-up time of at least 15 minutes to ensure that the measurement circuitry is at
a stable operating temperature.
•
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
•
Warm-up time for test equipment may vary depending on the manufacturer. Please refer to
the equipment's Operators Manual for specified warm-up time.
•
To meet Fluke 5520A specifications, zero the Calibrator every 7 days, or when the
Calibrator ambient temperature changes by more than 5 °C. Warm-up time for Fluke 5520A
is 30 minutes.
Calibration Procedure
This section provides instructions for verifying the performance of the PXIe-4330/4331.
The calibration process consists of the following steps:
1.
Initial
Setup—Install the module and configure it in Measurement & Automation Explorer
(MAX).
2.
Verification
Procedures—Verify the existing operation of the module. This step confirms
whether the module is operating within the published specifications—gain accuracy, input
offset, shunt quarter-bridge calibration, shunt calibration resistance, and excitation—prior
to adjustment.
3.
Gain and Offset Adjustment
adjusts the module calibration constants with respect to a known calibration source.
4.
Reverification—Repeat the verification procedure to ensure that the module is operating
within the published specifications after adjustment.
4 | ni.com | PXIe-4330/4331 Calibration Procedure
Procedure—If necessary, perform an external calibration that
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.
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