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Sweep Operation
Setting Sweep Parameters 6
This is useful because it forces the sweep always to start from the same point in the
waveform. You should be aware that in this case the waveform discontinuity may be
undesirable in some circumstances, for example in filter evaluation.
With sync is set to off the frequency steps directly and phase continuity is
maintained from the stop frequency to the start frequency. Note, however, that the sweep
is not synchronized to the software-generated trigger signal.
In triggered mode the generator holds the output at the start frequency until it
recognizes a trigger, at which the frequency sweeps to the stop frequency, resets, and
awaits the next trigger. If sync is set to on the frequency resets to zero frequency
(i.e. no waveform) and starts a new sweep at the first point of the waveform when the
next trigger is recognized. If sync is set to off the waveform resets to the start
frequency and continues at that frequency until the next trigger initiates a new sweep.
In trig’d, hold/reset mode the generator holds the output at the start frequency
until it recognizes a trigger; at which point the frequency sweeps to the stop frequency
and holds. At the next trigger the output is reset to the start frequency where it is held
until the next sweep is initiated by a further trigger. If sync is set to off the output
operates exactly as described above; if sync is set to on the frequency goes to zero at
the start and begins each new sweep at the first point of the waveform.
For both triggered and trig’d, hold/reset modes the TRIG IN input is
automatically set to external. The trigger source can be the rising edge of an external
signal applied to TRIG IN, a press of the MAN TRIG key on the front panel, or a remote
command.
In manual mode the whole sweep process is controlled from the MANUAL SWEEP
screen.
Manual Sweep
Pressing the manual… soft-key on the SWEEP SETUP screen calls the
MANUAL SWEEP FREQ screen:
MANUAL SWEEP FREQ:
1.630 MHz
step fast wrap
step slow done
Before manual control can be used, you must select manual on the SWEEP TYPE
screen. If manual has not been set, the message mode is not manual will be
displayed instead of the frequency.
In manual mode the frequency can be stepped through the sweep range, defined on the
SWEEP RANGE screen, by using the rotary control or cursor keys. Every point of the
frequency table is stepped through if step slow is selected; if step fast is set
then the frequency changes in multiple step increments. You can not select step fast
when the number of steps in the table is small.
If wrap is set the sweep wraps-round from start frequency to
stop frequency and vice-versa; if no wrap is set the sweep finishes at either the
start or stop frequency depending on the direction of the rotary control or cursor
keys.
6-5
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