HP 8642A Operation And Calibration Manual page 180

Opera tion Model 8 fi 4 2A/R
Knob (cont'd)
HP-lB
Codes
3-144
Example of Using Knob Hold To Maintain Control of a Function's Value When It Is
No Longer Active
Select Knob Hold on RF frequency.
ENTRY
LOCAL
(keys)
8
8
~
(program
codes)
Display
""' " ""' "
I 0 0.0 0 0 0 0 0
m z
FREQ
KNOB
HOLD
[2J
FRKHON
ENTRY
[j[J
ON
.'UI7II7I
nm'
r
1
I!...J.I!...J .L1
II
AMP'1"D
The frequency function is "held" on the Knob as indicated by the two cursors above the
frequency value, Therefore, the Knob can be used to change that value even when
another active function is selected.
Select amplitude as the active function by selecting the ( AMPTD ) key.
FREO
""' "
.,UI7II71
Tim'
r 1
I!...J.I!...J .L1
II
The cursor over the first letter of the units specifier (liD" in OM) indicates that Knob
Hold has been selected on some function. (There is no cursor over any of the amplitude
digits because the Knob is "held" on RF frequency which has two cursors over its
setting.) Now, turning the Knob changes frequency while selecting the Step keys (or
Data keys or [ RF OFF ON ) ) changes amplitude. All this can be done without needing
to select the active function's keys again.
Keys
Codes
KNOB INCR
KI
KNOB HOLD ON KHON'
KNOB HOLD OFF KHOF
ENTRY OFF EO
"Function should be preceded by an active
function code,