HP 8901B Operation And Calibration Manual page 323

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
=
B O
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