Operation Model 8901B
PROCEDURES
To disable Errors
01,02,
03, and
04,
select DISABLE ERROR (Blue Key, RANGE HOLD). This key
selection enables 8.7 SPCL.
To selectively enable
or
disable combinations
of
Errors 01 through
04,
enter the Special Function code
that corresponds
to
the condition desired, then select SPCL. The codes
for
the
various
conditions are
listed in the following table:
Error
Condition
Automatic Selection
01
disabled
02
and
03
disabledn
01, 02,
and
03
disabled
04
disabled
01
and
04
disabled
02, 03,
and
04
disabled
01, 02, 03,
and
04
disabled
01. 02.03,
and
04
enabled
Program
I
Code
Special Function
Code
HP-IB
8.0 SPCL
8.1 SPCL
8.2 SPCL
8.3 SPCL
8.4 SPCL
8.5 SPCL
8.6 SPCL
8.7 SPCL
8.8 SPCL
8.0SP
8.1 SP
8.2SP
8.3SP
8.4SP
8.5SP
8.6SP
8.7SP
8.8SP
HP-IB PROGRAM CODES
The HP-IB program codes for selectively disabling combinations
of
Errors
01
through
04
are provided
in “PROCEDURE”.
DISABLE ERROR
=
B1
Clear DISABLE ERROR function
=
BO
COMMENTS
Input/Output Status
When Error Messages are disabled, the accuracy
of
the displayed measurement and the fidelity of
the signal at the output of the MODULATION OUTPUT/AUDIO INPUT are not safeguarded.
When
all
the errors are enabled, displayed results are calibrated
and
the output of MODULATION
OUTPUT/AUDIO INPUT is entirely safeguarded.
Disable Error
04
Inhibits Audio Autoranging
When Error
04
is disabled, the Modulation Analyzer automatically ranges
to
a less sensitive range
when the signal level requires, but
it
does not range back when the audio level
is
reduced. Thus,
if
a transitory peak audio signal is detected, the Modulation Analyzer will up-range the audio range
to accommodate the peak but will not down-range
after
it
has
passed. Audio autoranging
is
then
prevented from interfering with other measurements such
as
input frequency. (Refer
to
Audio
Range
on page 3-183.)
Special Function
8
Overrides Automatic Selection
Note that Special Functions
8.1
through
8.8
override the automatic selection for
all
measurement
modes. Thus, error messages that may be appropriately disabled
for
one measurement mode (such as
frequency) may be inappropriate for another measurement mode (such
as
AM).
3-234
Error
Message Disable Control
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