Switch Repeatability Check (Es Models) - Agilent Technologies 8719ET Service Manual

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers

Switch Repeatability Check (ES Models)

Calibration does not compensate for the repeatability of the transfer switch in
instruments. As a result, the switch can be a source of error. To check the switch, use the
following procedure:
1. To set the analyzer bandwidth to 100 Hz and to take 16 averages, press the following:
Preset PRESET: FACTORY
IF BW
Avg 100
AVERAGING FACTOR
2. To access the response calibration menu, press
.
RESPONSE
3. Connect a short to PORT 1 and press
4. To display data/memory and scale the trace, press
DATA/MEM Scale Ref
5. Press and then repeatedly (6 to 12 times) press
Meas
Refl: FWD S11 (A/R)
measurement condition. After 16 averages, the trace should look similar to
Figure 4-10 Typical Switch Repeatability Trace
6. Press
Refl: REV S22 (B/R)
Meas
7. Connect a short to PORT 2 and repeat steps 2, 4 and 5.
Service Guide
Preset
x1
AVERAGING ON
16 x1
SHORT
.
.05 x1
to switch the transfer switch back and forth. Return to the S11
.
Switch Repeatability Check (ES Models)
CALIBRATE MENU
Cal
.
Display DATA→ MEM
Refl: REV S22 (B/R)
Start Troubleshooting Here
Figure 4-10.
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