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National Instruments Corporation
3
SCXI-1120/D Calibration Procedure
Test Conditions
Follow these guidelines to optimize the connections and environment
during calibration:
•
Keep connections to the SCXI-1120/D module short. Long cables and
wires act as antennae, picking up extra noise and thermal offsets that
can affect measurements.
•
Use shielded copper wire for all cable connections to the device.
Use twisted-pair wire to eliminate noise and thermal offsets.
•
Maintain the temperature between 18–28 °C.
•
Keep relative humidity below 80%.
•
Allow a warm-up time of at least 15 minutes for the SCXI-1120/D
module to ensure the measurement circuitry is at a stable operating
temperature.
Calibration
The calibration procedure for the SCXI-1120/D module consists of the
following steps:
1.
Set up the module for testing.
2.
Verify the existing operation of the module to determine whether it is
operating within its specifications.
3.
Adjust the module with respect to a known voltage source.
4.
Verify that the module is operating within its specifications after
adjustments.
