Keysight Technologies M937 A PXIe Series Service Manual page 41

Tests, Adjustments, and Troubleshooting
System Verification
- reflection and transmission frequency tracking, and
- isolation (crosstalk)
The random errors include:
- noise
- drift
- connector repeatability
- test cable stability
A complete description of system errors and how they affect measurements is
provided in the network analyzer's Help system (search for Measurement
Errors).
Any measurement result is the vector sum of the actual test device response
plus all error terms. The precise effect of each error term depends on its
magnitude and phase relationship to the actual test device response. When
the phase of an error response is not known, phase is assumed to be
worst-case (–180° to +180°). Random errors such as noise and connector
repeatability are generally combined in a root-sum-of-the-squares (RSS)
manner.
Keysight M937xA PXIe Service Guide 2-21