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Service
Model 8901B
8-8. ERROR MESSAGES
General
The instrument generates error messages to indicate operating problems, incorrect keyboard entries,
or service-related problems. The error message is cleared when the error condition is removed.
Error Message Catagories
Errors 01 through 19,30 through 39, and 90 through 99. These are Operating Error Messages, which
indicate that not all conditions have been met to assure a calibrated measurement. Operating Error
Messages can usually be cleared by readjustment of the front-panel controls. The Error Disable Special
]Function 8 can be used to selectively disable certain error messages. More information on Operating
Error Messages and error message disabling can be found under Error Message Summary and Error
Disable in Section 3 and on the Operating Information pull-out card.
Errors 20 through 29. These are Entry Error Messages, which indicate that an invalid key sequence or
keyboard entry has been made. These errors require that a new keyboard entry or function selection
be made. More information on Entry Error Messages can be found under
Error Message Summary
in
Section 3 and on the Operating Information pull-out card.
Errors 40 through 64. These are Measurement Progress
Error Messages which indicate
if a given
segment of the measurement cycle has been traversed. These messages are not normally enabled.
Errors 65 through 89. These are Service Error Messages which provide additional service-related
information and are discussed below. Service Error Messages do not necessarily infer that the
instrument has a problem but may indicate a normal phenomenon under the particular circumstances.
These messages are not normally enabled.
Enabling Measurement Progress and Service Error Messages
Service Error Messages (Errors 40 through 89) are not normally displayed. When a service-related
problem is suspected, enable the display Measurement Progress and Service Error Messages by keying
in Special Function 43.N with N determined as follows:
N=O
N=l
Disables display of Service Error Messages 65 through 89.
Enables display of Service Error Messages 65 through 89. Cleared by AUTOMATIC OPERATION
key.
N=2
Enables display of Service Error Messages 65 through 89. Not cleared by AUTOMATIC
OPERATION key.
N=40
through N=89 and N=140 through N=189. Enables measurement to pause or halt on
Measurement Progress and Service Error Message indicated by
N.
See the following paragraphs
for details.
Measurement Progress Error Messages (Errors 40 through 64)
These Service Error Messages are used to check the progress of a measurement. Refer to Table 8B-4,
Measurement Progress Error Codes and Figure 8D-5, Modualtion Analyzer Software Supervisor Flow
Chart. To see
if the measurement progresses through a particular segment
of the flow chart, enable the
error code corresponding to the segment in either of the two following ways:
1. To cause the measurement
to pause momentarily (approximately
1/2
second) and display the error
code when the segment
is
encountered and then to continue on, key in 43.N SPCL, where the
suffix
N
is the error code of the segment.
2. To cause the measurement to halt and display the error code when the segment is encountered,
key in 43.N SPCL, where N is the error code of the segment plus 100. Press CLEAR to exit.
8B-14
Error Messages
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