HP 8648 A/B/C/D - Changpuak.ch

4. Increment Set Keys When you press a FUNCTION key, that function becomes the active
function. Press (‘NCR] to view or change the increment value for
the active function. Press @) or @J at any time to change the active
function setting by the increment value. (If Option 1EP is present
and the signal generator is in the ENCODER mode, these keys have
alternate functions.)
1-4 Operation
If Option 1EP is present and the signal generator is in the ENCODER
mode, the (jj] key functions as a START/STOP key. This key
starts or stops any pager encoding activity. In addition, in this mode,
the (jjj and (7J-J function as PREV and NEXT keys. These keys let you
move the blinking cursor between each parameter when you are
entering the pager encoding settings.
5. Knobs The knobs are always active when the instrument is in local (front
panel) control. Turn them to increase or decrease the frequency or
amplitude of the RF output. Press a or (ZJ next to each knob, to
adjust the knob’s resolution.
Press @GZQ, next to each knob, to set the displayed value as the
reference value and turn on the reference mode. Press (REF ON/OFF) to
turn on and off the reference mode without changing the reference
value. When the reference mode is on, the displayed value indicates
the offset between the reference value and the RF output signal.
If Option 1EP is present and the signal generator is in the ENCODER
mode, the AMPLITUDE/ENCODER knob is used to enter a setting for
a pager encoding parameter.
6. MEMORY Memory registers allow you to save instrument set-ups and recall
them whenever you wish. Press a and enter a two-digit register
number to save the instrument’s current settings. ‘Ib recall the
settings, press (REG) and enter the register number. The arrow keys
allow you to recall registers in numerical sequence. You can arrange
your registers in up to ten different sequences.
The number of the currently selected sequence and the last register
selected are always displayed in the lower-left corner of the display to
help you keep track of where you are in your testing process.
(If Option 1EP is present, the sequence and register are not displayed
on any pager encoding menu.) The memory register examples
provided in Chapter la, “Operation Examples,” show you how
to create a sequence and how to delete or add registers in your
sequence.