Model 8903B Service
Error 78 Output Amplifier Overload after Leveling Once.
The Output Overload Detector has tripped 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
u----”
until Error 31 appears.
Error 79 Output Amplifier Overload with No Post-Notch Gain Hold.
The Output Overload Detector remains
tripped after three attempts to set the Output Amplifier gain and Special Function 3.N is
in
automatic selection.
See Service Sheet BD3. This error maps into a display of
“----
until
Error
31 appears.
Error 80 Cannot Count Oscillator Frequency in SINAD.
When the Oscillator
is
attempting to tune
to
the
frequency of the Notch Filter, the frequency count is
0.
See Service Sheets BD3 and BD4. This error maps into
Error 19.
Error 81 Cannot Count Input Frequency.
The input frequency cannot be counted in ac level, distortion, distortion
level,
or
signal-to-noise measurement modes. See Service Sheet
BD2.
This error maps into Error 13.
Error 82 Notch Filter Does Not Null.
The Notch
Filter
does not null
after
three attempts. This
would
be normal
for
an
erratic signal. See Service Sheet
BD2.
This error maps into Error
13.
Error 83 Cannot Count Input Frequency.
After sensing the presence of a signal, the count
is
0.
This would be
normal when the input signal is filtered by the High-Pass and Weighting Bandpass Filters. See Service Sheet
BD2. This error gives rise to
a
display of
0.00
Hz.
Error 84 Output Amplifier Overvoltage with No Overload.
The Output RMS/Average/Quasi-peak Detector senses
an overvoltage, the Output Amplifier gain is
0
dB,
but the Output Overload Detector has not tripped. See Service
Sheet BD2. This error maps into a display of
Error 85 Period of the Voltage-to-Time Converter
0.
The Counter receives no pulses from the Voltage-to-Time
Converter. This can occur
if
the input
to
the Voltage-to-Time Converter
is
too
negative. See Service Sheet BD2.
This error is identical to Error 17.
Error
86
Frequency Count Greater Than
200
kHz.
This error causes a display of
0.000
kHz.
Error 87 Output Amplifier Overload with Post-Notch Gain Hold.
The Output Overload Detector remains tripped
after three attempts
to
set the Output Amplifier gain and Special Function 3.N has been selected. See Service
Sheet BD2. This error maps into Error 19.
Error
88
Attempt to Take Log of Negative Ratio.
This error maps into
Error
11.
Error 89 Attempt to Take Log of Negative Number.
This error maps into Error
11.
Error 90 Decimal Point Fixed and Exponent Too Large.
One of the mV ranges has been requested by Special
Function 4.N for a measurement that does not use those ranges. This error maps into
Error
10.
Error 91 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
92
Decimal Point Fixed and Unable to Display.
This error maps into Error 10.
Error 93 Number to Be Displayed Greater Than 9999.
This error maps into Error 10.
Error 94 Attempt to Divide by Zero in Ratio.
This error maps into Error
11.
Error 95 Signal-to-Noise Ratio Too Large to Calculate.
This error maps into Error 10.
until Error 31 appears.
~
rev.BOJUN8
7
8-17
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