Range Hold - HP 8902A Quick Reference Manual

Model 8902A Operation
2
3
Range Hold
~
r
~~ ~~ ~
Audio Range Holds setting
RF and
IF
Filters
Holds setting
FUNCTIONS
RANGE HOLD
4
5
6
DESCRIPTION
Tuned RF Level Display Averaging No effect
Audio Detector Response
No effect
AM ALC Response No effect
The Range Hold function freezes the current ranges being used by the Measuring Receiver. This
function, the converse of Automatic Operation, disables automatic tuning and
sets
Special Functions
prefixed I , 2, 3, 7, 9, and 10 to the current range settings. The following functions are not affected
by Range Hold: High-pass and Low-pass Filters, FM De-emphasis, Measurement, Detectors, and
Display. Special Functions prefixed I through 10 that are already manually set are unaffected. The
table below summarizes the effect of the Range Hold feature:
7
8
I
1
Special Function
Prefix
RF Frequency Resolution
Holds setting
Error Message Disable
No effect
Measurement Function
-~
~~~ ~ ~ ~ ~ ~ ~~ ~ ~ ~~
9 IF Gain Holds setting
10 RF Power Range Holds setting
AUTO TUNING Selects Manual Tuning
I
Effect of RANGE HOLD
on
Functions
I
I
1
I
RF Input Attenuation and Gain Holds setting
PROCEDURE
To hold instrument settings in a specific measurement state, set the Measuring Receiver as desired,
then select RANGE
HOLD.
To exit the Range Hold mode, select RANGE
HOLD
a second time
or
select AUTOMATIC
OPERATION.
HP-IB PROGRAM CODE
Automatic Ranging
=
GO
RANGE HOLD
=
GI
3-243