Chapter 8 199
Hardware Options
Overview and Verification of Option 123, Microwave and Millimeter Preselector Bypass
Verifying Option 123, Microwave Preselector Bypass
(E4446A/E4447A/E448A)
The following test switches in and out the preselector bypass path while
viewing a signal. There may be slight amplitude differences between
the two signal paths.
1. Preset the PSA and signal source.
2. Connect the signal source to the PSA RF input with a high quality
low-loss cable.
3. The 4 GHz signal should appear on screen. The analyzer is currently
using the preselected path.
4. On the PSA, Press
Input / Output, Uw/mmW Preselectors OFF. You
should have heard the switches click. The preselectors are now
bypassed.
5. Tune the Source and PSA to 10 GHz, 15 GHz, 20 GHz, 30 GHz,
40 GHz and 50 GHz to determine if any problems exist in other
frequency bands. The accuracy of the measured amplitude will
depend on the source flatness, quality of interconnect cables, and the
frequency response of the PSA. You may wish to select
uW/mmW
Preselectors On
and run through the test frequencies so you can
compare both the preselector on and off amplitude values so you can
separate the amplitude variation of the preselector off state from the
test equipment and preselector on signal path contributions.
Table 8-2 Required Equipment
Description Recommended Model
Signal Source > 4 GHz 83630B
High quality,
low-loss cable, 2.4 mm
8120-6164
various adapters depending on
signal source used
PSA Settings
Mode Spectrum Analysis
Center Frequency 4 GHz
Start Frequency 3.06 GHz
Stop Frequency 10 GHz
Signal Source Settings
Frequency 4 GHz
Amplitude -10 dBm
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