HP 8642A Operating Manual page 168

Operation Model 8642A/B
Knob (cont'd)
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No Longer Active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.
LOCAL
(keys)
(program
codes)
ENTRY
I FREQ 1 f SHIFT 1
KNOB
HOLD
ENTRY
1
0Ff
1
1 ON |
FRKHON
Display
I00.000000CTZ
! U Pi
-i 0 . 0 H CT
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 I key.
10 0.0 0 0 0 0 0 CT
. I
H 0.0 U /I?
The cursor over the first letter of the units specifier ("D" in DM) 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 1 RF OFF OTsD ) changes amplitude. All this can be done without needing
to select the active function's keys again.
HP-IB
Codes
Keys
KNOB INCR
KNOB HOLD ON
KNOB HOLD OFF
ENTRY OFF
Codes
Kl
KHON*
KHOF
EO
'Function should be preceded by an active
function code.
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