Service Guide 9-7
8719ET/20ET/22ET Accessories Troubleshooting
8719ES/20ES/22ES Inspect the Error Terms
RF Network Analyzers
Verify Shorts and Opens by Substitution
Substitute a known good short and open of the same connector type and sex as the short
and open in question. If the devices are not from one of the standard calibration kits, refer
to your analyzer user’s guide for information on how to use the
function. Set aside the short and open that are causing the problem.
1. Perform an S11 one-port calibration on ES models (REFLECTION one-port calibration
on ET models) using the known good short and open. Then press
to view the devices in Smith chart format.
2. Connect the known good short to PORT 1 (REFLECTION port on ET models). Press
and turn the front panel knob to enter enough
electrical delay so that the trace appears as a dot at the left side of the circle, as in
Figure 9-2.
Replace the good short with the questionable short. If the questionable short is good,
the trace should appear very similar to the known good short.
3. Connect the known good open to PORT 1 (REFLECTION port on ET models). Press
and turn the front panel knob to enter enough
electrical delay so that the trace appears as a dot at the right side of the circle, as in
Figure 9-3 on page 9-8.
Replace the good open with the questionable open. If the questionable open is good, the
trace should appear very similar to the known good open.
Figure 9-2 Typical Smith Chart Trace of a Good Short
Format
Scale Ref
Scale Ref
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