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Step Sweep
Mode
In step sweep frequency mode, the output frequency
changes in discrete, synthesized steps between
selected start and stop frequencies. Step sweeps can
be from a low frequency to a high frequency or from
a high frequency to a low frequency. Step sweeps
can be selected to be linear or logarithmic. Sweep
width can be set from 1 kHz (0.1 Hz with Option 11)
to the full frequency range of the instrument.
The step size or number of steps between the start
and stop frequencies, the dwell time-per-step, the
sweep time, and the type of step sweep (linear or
logarithmic) and sweep trigger are controllable from
step sweep menus.
Selecting
Step Sweep
Mode
To place the 681XXC in step sweep frequency mode,
press the main menu key
CW/SWEEP
SELECT
At the resulting menu display, press Step . The Step
Sweep Menu (below) is then displayed.
This menu lets you perform the following:
q
Select a sweep range (edit the sweep start and
stop frequency parameters).
q
Go to the sweep ramp menu (set the dwell
time-per-step, the step size or number of steps,
set the sweep time, select log or linear sweep,
and select a sweep trigger).
q
Select an output power level for the sweep.
q
Go to the alternate sweep menu.
Setting Step
Size, Dwell
Time, and
Sweep Time
In linear step sweep, the sweep is linearly incre
-
mented (or decremented) by the step size from the
start frequency to the stop frequency. There are two
ways to set the size of each step of the linear step
sweep—set the step size or set the number of steps.
681XXC OM 3-29
LOCAL (FRONT SWEEP FREQUENCY
PANEL) OPERATION OPERATION