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281, 282, 284
Users Manual
Sweep Spacing
Pressing the spacing… soft-key on the SWEEP SETUP screen calls the
SWEEP SPACING screen:
SWEEP SPACING:
logarithmic
linear
done
With linear selected the sweep changes the frequency at a linear rate; with
logarithmic selected the sweep spends an equal time in each frequency decade.
Sweep Marker
Pressing the marker… soft-key on the SWEEP SETUP screen calls the
SWEEP MARKER FREQ screen:
SWEEP MARKER FREQ:
program: 5.0
00 MHz
actual: 4.977 MHz
done
A new marker frequency can be programmed directly from the keyboard or by using the
rotary control and cursor keys. Note that the marker frequency can only be one of the
values in the sweep frequency table; any value in the sweep range can be entered but the
actual value will be the nearest frequency in the table. When sweep is turned on, the
actual marker frequency is shown in the non-editable field below the programmed
frequency. For the default sweep setting of 100 kHz to 10 MHz in 50 ms (which is
completed in 400 steps), the actual frequency of a 5 MHz marker is 4·977 MHz.
The marker duration is for the number of 0·5 ms intervals that the frequency remains at
the marker value; for fast and/or wide sweeps this will often be the 0·5 ms minimum but
for slow and/or narrow spans the marker may last many 0·5 ms intervals. To avoid
anomalous conditions the marker will not be exactly placed at the start and stop
frequencies even though it can be programmed to be so. The marker polarity and level is
set up on the cursor/marker… menu of the UTILITY screen. For full details
refer chapter 14, System Operations from the Utility Menu.
You can change the marker frequency can be changed while the sweep is on but since the
table of frequency values is rebuilt with each change this can be a slow process,
especially if the rotary control is used. You can achieve the same result more quickly by
switching the sweep off, changing the marker, then switching the sweep back on.
Sweep Hold
The sweep can be held or restarted at any time at or from its current frequency by
alternate presses of the MAN HOLD key or by a remote command. As with all other
sweep controls, pressing MAN HOLD will halt the sweep on all channels for which
sweep has been set on.
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