HP 8642A Operating Manual page 167

Model 8642A/B
Operation
Knob (cont'd)
Example of Controlling Knob Resolution by Setting Knob Increment
Use the Knob to increment frequency by 25 kHz per step.
LOCAL
(keys)
(program
codes)
ENTRY
1 « ° ] [ ™ \
DATA
m m m
[ SHIFT ]
KNOB
INCH
F R I S 2 5 K Z Kl
Display
I00.D0CCGO/TIZ -IH0.0DCT
Knob resolution has been set with the Knob Increment function as indicated by the
cursor over the "Z". Turning the Knob will step frequency in 25 kHz steps.
HOLD
How to Use Knob Hold to Maintain Control of a Function's Value When Another Function Is Active
Knob Hold is a way to maintain Knob control over one function while acquiring the
ability to change another function's value with the Step and Data keys and the Off/On
key. Knob Hold can be turned on by:
Selecting the desired active function, then HOLD ( rSHIFT I m ), fOFF ON I.
Knob Control is "held" on the selected function as indicated by the two cursors over
that "held" function. Selecting a different function key sets that different function as
the active function (which can be acted on only by the Step keys, or Data keys, or the
Off/On key). Knob control does not transfer to this new active function, but stays with
the function that was active when Knob Hold was selected. (During Knob Hold, a
function with just one cursor is not controlled by the Knob; the function having two
cursors is controlled by the Knob.)
Turn off Knob Hold by selecting Knob HOLD (I SHIFT I CtD ) f OFF ON I. Knob
Hold (along eith all other Knob-related functions) can also be turned off by selecting
ENTRY OFF (I SHIFT I I RF OFF/ON I ).
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