Chapter 8 191
Hardware Options
Overview and Verification of Option 123, Microwave and Millimeter Preselector Bypass
Verifying Option 123, Microwave Preselector Bypass
(E4440A/E4443A/E4445A)
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, Microwave Preselector OFF. You
should have heard the switches “click”. The preselector is now
bypassed.
The 4 GHz signal will still be present, however the display may show
many other responses. This occurs because the preselector filter that
eliminates input frequencies that cause these images, multiples, and
out-of-band responses; has been bypassed by the Option 123
hardware.
You may also notice a step in the noise floor at the 6.6 GHz
bandcrossing. This is normal performance of the Option123
Table 8-1 Required Equipment
Description Recommended Model
Signal Source > 4 GHz 83630B
High quality,
low-loss cable, 3.5 mm
(2 required)
8120-4921
Adapter, N (m) to 3.5 mm (f) 1250-1744
Adapter, 3.5 mm (f) to 3.5 mm (f) 83059B
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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