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Opera ti o n
Model 8902A
Errors 20 through 29.
These messages are Entry
Errors
which indicate an invalid key sequence o r keyboard entry. These
errors require that a new keyboard entry o r function selection be made. Some of these error displays
time out after a few seconds and then allow the display to return to the current measurement.
Errors 30 through 39.
These messages are Tuned R F Level Calibration Errors which indicate a condition that has not been
met
to
assure calibration. The error can usually be cleared by readjusting the input signal, o r by
setting Special Functions 1 and
9 to
automatic selection.
Errors 40 through 89.
These messages are Service Errors generated to provide service-related information. They must be
enabled
to
be displayed since they are not displayed in normal instrument operation. Service Error
Messages are discussed in Section 8 of the Service Manual.
HP-IB
HP-16 Output Format
The
HP-IB
output format for errors is shown below:
+900000 DD 00 E+01 CR LF
Line Feed
Error Cod
Carriage Return
Fixed
Data
Fixed Exponent
Fixed Data
For
example,
Error
02 is output to the HP-IB as +9000000200E+O1CRLF. Once an error has been
input to the computing controller, the error code is simply derived by subtracting 9x 10'" from the
input number, then dividing the result by
1000.
Error
Messages
The following table describes all Operating Errors and includes the error code, message, and the
action typically required to remove the error-causing condition. The COMMENTS column that
follows provides additional information and references pertaining to particular error messages.
3-286
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