Model 8901B Operation
Error
Message
Summary
DESCRIPTION
Error Messages are one means the Modulation Analyzer uses
to
safeguard measurement integrity.
When the instrument senses a potential error-causing situation, an Error Message code
is
displayed
to
alert the user of the condition. The Error Message code indexes an Error Message which describes the
current error. Error Messages indicate operating problems, incorrect keyboard entries, or service-related
problems. The error message
is
usually cleared when the error condition
is
removed.
Two
types of error message display formats are used
Error NN: The numerical value (NN) of the error message
is
displayed and
-
-
No detectable signal falls within the
IF’
passband. Either no signal
is
at the input, or the
instrument cannot tune
to
find the applied signal. (For example,
it
might be manually tuned far
enough away from an input signal that no power
is
detected in the
IF’.)
This display
is
output
to
the HP-IB as Error
96
using the HP-IB output format described in “HP-IB Output Format”.
----
A
signal has been detected but, for various reasons, a measurement result is not yet
available. The instrument might be still completing the measurement requested, or in some cases,
unable
to
complete
a
measurement because
of
manual settings of special Wctions. (For example,
when frequency measurements are made on
a
low-level input signal with high AM depth, or when
the RF input attenuation
is
improperly
set.)
This
display
is
never output
to
the HP-IB and
typically indicates
a
transitory state in instrument operation.
Error messages are grouped by error code
as
follows:
Errors 01 through 19
and
90 through 99
These messages are Operating Errors which indicate a condition
has
not been met
to
assure a calibrated
measurement. Operating Errors can usually be cleared by readjustment of front-panel controls (usually,
the easiest way
is
to
select AUTOMATIC OPERATION). The DISABLE ERROR key or Special
Function
8
can be used
to
selectively disable Errors
01
through
04.
(Refer
to
Error
Message
Disable
Control
on page
3-233.)
Errors 20 through 29
These messages are Entry Errors which indicate an invalid key sequence or keyboard entry. These
errors require that a new keyboard entry or 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
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.
Error Message
Summary
3-247
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