Specifications

Frequency Response Troubleshooting
If the frequency response test fails at frequencies below 3 GHz (Low band), the following
should be done:
Perform the Frequency Response Adjustment in its entirety. If the adjustment does not fix
the problem, or the adjustment cannot complete, suspect a hardware problem. Major
assemblies to suspect are: The A20 Lowband Assy, the optional A22 Lowband preamp,
optional A27 Electronic attenuator, or the A13 Front End Driver circuits that control the
assemblies listed.
If frequency response fails at several frequencies between 9 kHz and the maximum
frequency range of the analyzer (failures in both High band and Low band), and a
readjustment does not fix the problem, suspect assemblies that are common to both High
and Low bands such as a damaged Input Attenuator or the A10 Third Converter.
In order to troubleshoot an RF problem, refer to the PSA Series Service Guide for
troubleshooting procedures and the overall block diagram. Assemblies can be bypassed
by injecting 321.4 MHz, or 3921.4 MHz signals at the appropriate places.
Frequency Response (Option B7J)
Related Adjustments
● Frequency Response Adjustment (Option B7J)
If the option B7J frequency response test fails, but the standard frequency response is in
spec, suspect the A27 Electronic Attenuator or A27 interconnect cables. If both the
option B7J and the standard frequency response both fail, troubleshoot as if B7J were not
present, but do not discount the signal path switch in the A27 electronic attenuator.
http://mktwww.soco.agilent.com/field/lp/PSA/PSAcalSWwebhelp/Troubleshooting/troublefreqres.htm (2 of 2) [5/29/2003 8:47:48 AM]