Chapter 6
Operator Maintenance
6-1
INTRODUCTION
This chapter provides the information necessary for operator mainte-
nance of the sweep generator. Operator maintenance is limited to trou-
bleshooting and repairs that can be made without removing the instru-
ment covers.
6-2
ERROR AND
WARNING/STATUS
MESSAGES
During normal operation, the 681XXB generates error messages to in-
dicate internal malfunctions, abnormal signal generator operations, or
invalid signal inputs or data entries. It also displays warning messages
to alert the operator to conditions that could result in inaccurate sweep
generator output. In addition, status messages are displayed to remind
the operator of current menu selections or settings.
Self-Test
Error
Messages
The 681XXB firmware includes internal diagnostics
that self-test the instrument. These self-test diagnos-
tics perform a brief go/no-go test of most of the in-
strument PCBs and other internal assemblies.
You can perform an instrument self-test at any time
during normal operation by pressing
SYSTEM
and
then
Selftest
.
If the sweep generator fails self-test, an error mes-
sage(s) is displayed on the front panel data display.
These error messages describe the malfunction and,
in most cases, provide an indication of what has
failed. Table 6-1, next page, is a summary listing of
the self-test error messages. Included for each is a
description of the probable cause(s), whether or not
the 681XXB is still operable, and if operable,what op-
erational degradation can be expected.
During self-test with
RF OUTPUT
set to
ON
, the output
power level is set to 0 dBm. Always disconnect sensitive
equipment from the unit before performing self-test.
CAUTION
681XXB OM
6-3
Changed: November 1995
