•
Keep cabling as short as possible. Long cables act as antennas, picking up extra noise that
can affect measurements.
•
Verify that all connections to the PXIe-5164, including front panel connections and
screws, are secure.
•
Use shielded copper wire for all cable connections to the device. Use twisted-pair wire to
eliminate noise and thermal offsets.
•
Maintain an ambient temperature of 23 °C ± 3 °C.
•
Keep relative humidity between 10% and 90%, noncondensing.
•
Ensure that the PXI chassis fan speed is set to HIGH, that the fan filters, if present, are
clean, and that the empty slots contain filler panels. For more information about cooling,
refer to the
Maintain Forced-Air Cooling Note to Users
document available at
.
•
Plug the chassis and the instrument standard into the same power strip to avoid ground
loops.
Password
The default password for password-protected operations is
NI
.
Calibration Interval
Recommended calibration interval
2 years
As-Found and As-Left Limits
The as-found limits are the published specifications for the PXIe-5164. NI uses these limits to
determine whether the PXIe-5164 meets the specifications when it is received for calibration.
Use the as-found limits during initial verification.
The as-left calibration limits are equal to the published NI specifications for the PXIe-5164,
less guard bands for measurement uncertainty, temperature drift, and drift over time. NI uses
these limits to reduce the probability that the instrument will be outside the published
specification limits at the end of the calibration cycle. Use the as-left limits when performing
verification after adjustment.
Measurement Uncertainty
Measurement uncertainty was calculated in accordance with the method described in ISO
GUM (Guide to the Expression of Uncertainty in Measurement), for a confidence level of
95%. The expressed uncertainty is based on the recommended measurement methodology,
standards, metrology best practices and environmental conditions of the National Instruments
laboratory. It should be considered as a guideline for the level of measurement uncertainty that
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ni.com
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PXIe-5164 Calibration Procedure
