Service Model 8903B
8-24.
ERROR
MESSAGES
8-25. General
The instrument generates error messages to indicate operating problems, incorrect keyboard entries,
or
service-
related problems. The error message is generally cleared when the error condition is removed. The error messages
are grouped by error code as follows:
Error 10 through Error 39 and Error 96.
These are Operating and Entry
Errors
which indicate that not all
conditions have been met to assure a calibrated measurement
or
that an invalid key sequence
or
keyboard entry
has been made. Operating Errors can usually be cleared by readjustment of the front-panel controls. The Error
Disable Special Function (8.N) can be used to selectively disable certain operating error messages. Entry
Errors
require that a new keyboard entry
or
function selection be made. More information on Operating and Entry
Errors
and
error
message disabling can be found under
Error
Message Summary
and
Error
Disable
in the
Detailed
Operating Instructions
in Section
3
and on the Operating Information pull-out cards.
Error 65 through Error 95.
These are Service Errors which provide additional service-related information and are
discussed below.
8-26. Service Errors (Error 65 through Error 95)
Service
Errors
are not normally displayed. When a service-related problem
is
suspected, enable the Service
Errors
by keying in 43.1
SPCL.
Also a specific error message can be enabled by keying in 43.N where N is the number
of the desired error message (N=65 through 95). Service Errors can be disabled by keying in 43.0 SPCL
or
by
pressing AUTOMATIC OPERATION. Not all Service Errors are an indication of a problem but may be
a
normal
occurrence under the circumstances. When Service Errors are not enabled, a Service Error will often map into
an Operating
or
Entry Error; when Service Errors are enabled, both Service and Operating
or
Entry Errors are
displayed sequentially.
Error 65 Decimal Point Fixed
Too
Far to the Left.
The decimal point
has
been held by Special Function 4.N and
the reading
to
be displayed is too large
to
fit
the display. This error maps into Error 10.
Error 70 Cannot Count Oscillator Frequency.
When the Oscillator
is
being tuned (that is, when
a
new frequency
is
entered
or
a new measurement mode requiring tuning has been selected), the frequency count
is
0.
See Service
Sheets BD3 and BD4. This error maps into Error 19.
Error 71 Oscillator Tune Abort.
The Oscillator failed to tune after three attempts. See Service Sheet BD3. This
error
is
identical to Error
18.
Error 72 AC Input Overload with Input Range Hold.
For
all measurements except dc level, the Input Overload
Detector has tripped while the input level range has been held with Special Function l.N. See Service Sheet BD2.
This error maps into
Error
30.
Error 73 Input AC Level Abort.
For
all measurements except dc level, the Input Amplifier failed to level after three
attempts. This would be normal for an unstable signal. See Service Sheet BD2. This error maps into a display of
''_-_-
until Error 31 appears.
Error 74 Output Amplifier Overload with Output Amplifier at
0
dB Gain.
The Output Overload Detector has
tripped with the Output Amplifier gain
at
0
dB.
See Service Sheet BD2. This error maps into a display of
u----n
until Error 31 appears.
Error 75 DC Input Overload with Input Range
Hold.
For
a dc level measurement only, the Input Overload Detector
has been tripped while the input level range has been held with Special Function
2.N.
See Service Sheet BD2.
This error maps into Error 30.
Error 76 Too Much AC for DC Level Measurement.
For
a dc level measurement, the Input Overload Detector
has tripped because of too much ac (as sensed by the Input Range Detector). This error maps into Error 14
or
generates a normal range down.
Error 77 Output Amplifier Gain
loo
High after Leveling Once.
The Output RMS/Average/Quasi-peak Detector
has sensed too high a level after one attempt to set the Output Amplifier gain. This would be normal for an
unstable signal. See Service Sheet BD3. This error maps into a display of
''----n
until
Error
31 appears.
8-16
rev.20JUN87
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