Installation Note E4440-90613 3
Switchable Microwave Preselector Bypass Installation Kit
Switchable Microwave Preselector Bypass
Installation Kit
Introduction
This installation note explains how to install the Switchable Microwave Preselector
Bypass into newer instruments that have the serial prefix listed above.
Because the mixer in this kit requires the same FELOMA LO output that the external
mixing option AYZ requires, the two options cannot be installed at the same time.
The retrofit adds a switchable alternate signal path when the analyzer start frequency is
above 3.05 GHz. This alternate path bypasses the preselector filter and mixer in the
normal highband path. The advantage of bypassing the preselector is that the
preselector filter will drift with time and temperature and will cause small amplitude
errors.
When the preselector is bypassed, images, multiples and out of band responses will
appear on the analyzer display since there is no longer a bandpass filter present to limit
the input frequency range of the analyzer. Therefore, the display may show many signal
responses even though only one response is the true signal. Since the preselector can be
switched in or out easily, it is possible to find a signal in preselected mode and tune to it,
then switch the preselector out and measure it.
Products Affected: PSA E4446A
PSA E4447A
PSA E4448A
Serial Numbers: US4430 / US9999
MY4430 / MY9999
SG4430 / SG9999
To Be Performed By: (X) Agilent Service Center
(X) Personnel Qualified by Agilent
( ) Customer
Estimated Installation Time:
Estimated Adjustment and Verification Time:
2.5 Hours
5.5 Hours (see note 1)
Additional Recommended Task Agilent recommends that a full calibration be
performed to verify instrument specifications.
(see note 2)
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