Agilent Technologies 8719ET Service Manual page 41

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
Cable Substitution
The test port cables specified for the network analyzer system have been characterized for
connector repeatability, magnitude and phase stability with flexing, return loss, insertion
loss, and aging rate. Since test port cable performance is a significant contributor to the
system performance, cables of lower performance will increase the uncertainty of your
measurement. Refer to the plots in the cable tests (earlier in this chapter) that show the
performance of good cables. It is highly recommended that the test port cables to be
regularly tested.
If the system verification is performed with non-HP
repeated with HP
/Agilent
be documented in the comments area of the performance verification printout that
non-HP cables were used in the system. The effects of the non-specified cables
/Agilent
cannot be taken into account in the system verification procedure.
See supported system configurations in
Calibration Kit Substitution
The accuracy of the network analyzer system is dependent on how well the standards are
defined in your calibration kit.
The measurement uncertainties for the system assume a calibration with an HP
calibration kit. Calibrations made with user defined or modified calibration kits are not
subject to the system specifications, although a procedure similar to the standard
verification procedure may be used.
See supported system configurations in
Service Guide
cables and passes, the non-HP
Table 2-1
Table 2-1
System Verification and Performance Tests
cables and fails, but is then
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cables are at fault. It must
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and Table 2-2 on page
and Table 2-2 on page
System Verification
2-18.
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2-18.
2- 19