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Service Guide E8364-90026
3-21
PNA Series Microwave Network Analyzers
Tests and Adjustments
E8362B, E8363B, E8364B
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,
• reflection and transmission frequency tracking, and
• isolation (crosstalk).
The random errors include:
• noise,
• drift,
• connector repeatability, and
• test cable stability.
A complete description of system errors and how they affect measurements is provided in
the analyzer’s on-line embedded help.
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.
Содержание E8362B
Страница 11: ...Service Guide E8364 90026 1 1 1 Safety and Regulatory Information ...
Страница 19: ...Service Guide E8364 90026 2 1 2 General Product Information ...
Страница 33: ...Service Guide E8364 90026 3 1 3 Tests and Adjustments ...
Страница 83: ...Service Guide E8364 90026 4 1 4 Troubleshooting ...
Страница 151: ...Service Guide E8364 90026 5 1 5 Theory of Operation ...
Страница 185: ...Service Guide E8364 90026 6 1 6 Replaceable Parts ...
Страница 269: ...Service Guide E8364 90026 7 1 7 Repair and Replacement Procedures ...
Страница 351: ...Service Guide E8364 90026 8 1 8 General Purpose Maintenance Procedures ...