Agilent Technologies PSA Series Service Manual page 199

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.
Table 8-2 Required Equipment
Description
Signal Source > 4 GHz
High quality,
low-loss cable, 2.4 mm
various adapters depending on
signal source used
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
5. Tune the Source and PSA to 10 GHz, 15 GHz, 20 GHz, 30 GHz,
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 preselectors are now
bypassed.
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
and run through the test frequencies so you can
Preselectors On
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.
Recommended Model
83630B
8120-6164
Spectrum Analysis
4 GHz
3.06 GHz
10 GHz
4 GHz
-10 dBm
,
Uw/mmW Preselectors OFF
Hardware Options
. You
uW/mmW
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