HP 8642A Operation And Calibration Manual page 187

Model 8642A/B
Operation
Step, Increment Set
Related
Operating
Instructions
Undisplayed Digits May Appear to Affect Maximum Settings
You can step in increment set values that will not be displayed when the resolution of
the current setting is coarser than the increment set value. (For example, with FM
deviation set to 1.30 MHz, an increment change of I kHz will not be displayed until
10 increments have been stepped) Consequently, if at any time you step the displayed
setting by that undisplayed increment setting, and then turn the Knob, the Signal
Generator may seem to not be able to reach its maximum value. For example, stepping
from 1.300 MHz (displayed value of 1.30 MHz) to 1.301 MHz (displayed value 1.30
MHz), and turning the Knob will only allow a maximum displayed value of 1.49 MHz
(since the maximum possible deviation is I
SOO
MHz, not 1.501 MHz)
How to Put the Increment Set Value on the Knob
Select KNOB INCR ( I SHIFT
I
G)
to use the Knob to change function values by
the increment set values. With Knob Increment, the function's value will change
approxima tely 15 increments per revolution when the Knob is turned. Refer to Knob,
page 3-142, for more information a bout putting the increment set value on the Knob
using the Knob Increment functions.
Negative Values Are Not Possible with Increment Set
The Signal Generator only accepts positive increment set values. Specifying a negative
increment value selects the absolute value of that number.
Refer to Instrument Preset, Partial Preset (page 3-139) for information about setting
the instrument to an lIlitialized state that maintains increment set values.
Refer to Operating Messages (page 3-177) if the instrument displays a message you
want clarified.
3-151