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281, 282, 284
Users Manual
Sweep Time
Pressing the time… soft-key calls the SWEEP TIME screen:
SWEEP TIME:
0.05
sec
(steps=100)
done
The sweep time can be set from 0·03 to 999 s with 3-digit resolution by direct keyboard
entry or by using the rotary control. As explained above, sweeps lasting less than 1·03
seconds will contain less than the maximum 2048 steps because of the minimum 0·5 ms
dwell at each step. For this reason the number of steps in the sweep is displayed as a non-
editable field below the sweep time.
Sweep Type
Pressing the type soft-key calls the SWEEP TYPE screen:
SWEEP TYPE:
continuous
direction: up
sync: on done
This screen is used to set the sweep mode (continuous; triggered; triggered, hold and
reset; manual) and sweep direction.
Successive presses of the direction soft-key select one of the following sweep
directions:
up start frequency to stop frequency.
down stop frequency to start frequency.
up/down start frequency to stop frequency and back to start frequency.
down/up
stop frequency to start frequency and back to stop frequency.
The total sweep time is always that set on the SWEEP TIME screen, i.e. for up/down
and down/up operation the sweep time in each direction is half the total. Similarly the
total number of steps is the same for all choices, i.e. there will be half the number of steps
in each direction for up/down and down/up operation. In the sweep mode
descriptions which follow the direction is assumed to be up but all modes can be used
with all sweep directions.
In continuous mode the generator sweeps continuously between the start and stop
frequencies, triggered repetitively by an internal trigger generator whose frequency is
determined by the sweep time setting. At the stop frequency the generator resets to the
start frequency after a delay (nominally long enough for an oscilloscope to retrace), and
begins a new sweep.
If sync is set to on (the default) the generator steps from the stop frequency to zero
frequency and then starts the next sweep from the first point of the waveform,
synchronized to the internally generated trigger signal.
6-4
1.888.610.7664 sales@GlobalTestSupply.com
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