Agilent Technologies PSA Series Service Manual page 191

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.
Table 8-1 Required Equipment
Description
Signal Source > 4 GHz
High quality,
low-loss cable, 3.5 mm
(2 required)
Adapter, N (m) to 3.5 mm (f)
Adapter, 3.5 mm (f) to 3.5 mm (f)
1. Preset the PSA and signal source.
2. Connect the signal source to the PSA RF input with a high quality
Mode
Center Frequency
Start Frequency
Stop Frequency
Signal Source Settings
Frequency
Amplitude
3. The 4 GHz signal should appear on screen. The analyzer is currently
4. On the PSA, Press
Chapter 8
Overview and Verification of Option 123, Microwave and Millimeter Preselector Bypass
low-loss cable.
PSA Settings
using the preselected path.
Input / Output
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
Recommended Model
83630B
8120-4921
1250-1744
83059B
Spectrum Analysis
4 GHz
3.06 GHz
10 GHz
4 GHz
-10 dBm
,
Microwave Preselector OFF
Hardware Options
. You
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