NI PXIe-5693 Calibration Procedure
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© National Instruments
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As-Found and As-Left Limits
The as-found limits are the published specifications for the NI 5693. NI uses these limits to
determine whether the NI 5693 meets the device specifications when it is received for
calibration.
The as-left limits are equal to the published NI specifications for the NI 5693, less guard bands
for manufacturing 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.
Verification
The performance verification procedures assume that adequate traceable uncertainties are
available for the calibration references.
Verifying Noise Figure
1.
Connect the noise source output to the spectrum analyzer RF input connector using the
SMA (f)-to-SMA (f) adapter and the SMA (m)-to-SMA (m) cable.
2.
Connect the noise source input to the spectrum analyzer noise source supply connector
using the BNC (m)-to-BNC (m) cable. Figure 6 shows the completed equipment setup.
Note
This measurement is sensitive to radiated electromagnetic interference (EMI)
from outside sources such as cellular telephones, computers, unshielded cables, and
so on. For best results, locate sources of EMI radiation as far as possible from the
device under test.
