HP 70000 series - Troubleshooting Procedures; Troubleshooting a Lightwave Signal Analyzer

Troubleshooting
Procedures
The
information
in
this
section
covers
the
following
troubleshooting procedures for
HP
70000
Series
modular
spectrum
analyzer
systems:
\Troubleshooting
a
Lightwave
Signal
Analyzer"
Categorizing
F
ailures
Troubleshooting
from
the
Front
Panel
\Troubleshooting
Over
the
HP-IB"
Read
the
preceding
section, \Troubleshooting Tools," before beginning the following
procedures.
Troubleshooting a Lightwave Signal Analyzer
The following troubleshooting procedure can be used to isolate a problem to either the
HP 70810B lightwave section or the electrical spectrum analyzer that is incorporated into the
lightwave signal analyzer.
The
HP
71400C
lightwave
signal
analyzer
combines
an
HP
70810B lightwave section with an
HP
71210C microwave spectrum analyzer.
The HP 71401C lightwave signal analyzer combines an HP 70810B lightwave section with an
HP 71100C modular spectrum analyzer.
This procedure is intended for use with a lightwave signal analyzer that has a suspected
performance problem, yet has no obvious system problem. Troubleshoot major lightwave
signal analyzer system failures just as you would for a spectrum analyzer. Refer to the relevant
section of this chapter for system-related problems (for example, a display, HP-MSIB,or
catastrophic failure).
Note
The HP 70810B lightwave section must be returned to the factory for all
testing, servicing and repair. If a lightwave section is found to be faulty,
contact your nearest Hewlett-Packard service oce.
The troubleshooting procedure is divided into two parts. Both portions of the procedure use
the same calibration routine to test the performance of the system.
The rst part of the procedure checks the performance of the electrical spectrum analyzer
while assuming good electrical switches in the HP 70810B lightwave section. If no failure
is detected, the RF signal path through the lightwave signal analyzer system is functioning
normally.
If the calibration routine fails
, the second part of the procedure is performed. The RF signal
path through the HP 70810B lightwave section is bypassed and the calibration routine is
repeated. If the calibration routine now passes
, the HP 70810B lightwave section is suspect. If
the test fails, the electrical spectrum analyzer is suspect.
Troubleshooting 5-9