System Verification; What The System Verification Verifies; Measurement Uncertainty - Keysight Technologies M937 A PXIe Series Service Manual

Tests, Adjustments, and Troubleshooting

System Verification

System Verification
System verification is used to verify system-level, error-corrected uncertainty
limits for network analyzer measurements. The verification procedure is
automated and is contained in the firmware of the network analyzer.
The device data provided with the verification kit has a traceable path to a
national standard. The difference between the supplied traceable data and the
measured data must fall within the total uncertainty limits at all frequencies for
the system verification to pass.
The total measurement uncertainty limits for the system verification are the
sum of the factory measurement uncertainties for the verification devices and
the uncertainties associated with the system being verified.
Passing this system verification does not guarantee that the network
analyzer meets all of its performance specifications. However, it does
show that the network analyzer being verified measures the same devices
with the same results as a factory system which has had all of its
specifications verified and its total measurement uncertainty minimized.

What the System Verification Verifies

The system verification procedure verifies proper operation of the:
- network analyzer
- calibration kit
- test port cables
together as a "system." It DOES NOT verify that any of these components pass
their specifications independently. The user is responsible for independently
calibrating and verifying the proper operation of the calibration kit and test
port cables prior to performing the system verification.
Additional equipment or accessories used with the above system are not
verified by system verification.

Measurement Uncertainty

Measurement uncertainty is defined as the sum of the residual systematic
(repeatable) errors, and the random (non-repeatable) errors in the
measurement system after calibration.
The systematic errors are:
- directivity
- source match
- load match
2-20 Keysight M937xA PXIe Service Guide