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National Instruments Corporation
3
NI PXI-665x Calibration Procedure
Calibration Interval
The measurement requirements of the application determine how often you
should calibrate the device to ensure its accuracy. National Instruments
recommends that you calibrate the NI PXI-6653 and NI PXI-6652
yearly
.
You may want to shorten this interval based on the application demands.
Password
The default password for password-protected operations is
NI
.
Test Equipment
Calibrating the NI PXI-665
x
requires the following equipment.
Test Conditions
Follow these guidelines to optimize connections and test conditions during
the calibration procedure:
•
Install the NI PXI-665
x
in Slot 2 of the PXI chassis. The calibration
procedure requires features of PXI that are accessible only in slot 2.
Use of an NI PXI-1044 or NI PXI-1045 chassis is recommended to
reduce error associated in variance in the 5 V chassis supply.
•
Maintain a temperature of approximately 25 °C.
•
Keep relative humidity below 80 percent.
•
Use shielded copper wire for all cable connections to the device.
•
Allow a warm up time of at least 15 minutes for the NI PXI-6652 and
three hours for the NI PXI-6653 to ensure the measurement circuitry is
at a stable operating temperature.
•
Keep PXI chassis filters clean and fan speed set to High.
Equipment
Recommended Model
Requirements
10 MHz clock source
Symmetricom/Datum 8040
Accurate to within
0.75 parts-per-billion (ppb) for the
NI PXI-6653, or 150 ppb for the
NI PXI-6652.
BNC-SMB cable
—
—
SMB-SMB cable
—
—
