Fluke DDS Function Generator 271, User Manual

Page: 49 / 132

Sweep Operation
Setting Sweep Mode, Ramp Time and Source
6
6-3
BEG FRQ=100.0000kHz
END FRQ=10.00000MHz
MARK FRQ=5.000000MHz
MORE->>>
The
BEG
in,
END
, and
MARKER
frequencies can all be set or modified in exactly the
same way as described for the setting of the frequency in chapter 5, Main Generator
Operation .
In summary, with the cursor in the first field of any line, the
DIGIT
keys or rotary control
will alternate the display between
FRQ=
and
PER=
; with the cursor in the numeric
field the
DIGIT
keys will move the cursor within the field and the rotary control will
change the value in increments determined by the cursor position; with the cursor in the
units field, the
DIGIT
keys or rotary control will change the value in decade increments.
Direct keyboard entries (numeric digits plus units) will be accepted with the cursor
anywhere in the line of the display. Note that if sweep mode is actually on (alternate
presses of the
SWEEP
key toggle the sweep on and off) and the ramp time is set to
200 ms or less, then changing the
BEG
in or
END
frequency causes the current sweep to
be aborted, the frequency steps to be recalculated, and a new sweep started at each
frequency change; it is therefore quicker to make changes with the sweep switched off.
The
MARK FRQ
can, however, be changed without interrupting the sweep.
A second marker is also displayed at the frequency set on the main menu, i.e. at the
frequency set for the generator in non-sweep mode. This offers the advantage of a marker
adjustable from the same menu used to control amplitude, offset, etc.
The marker signal is output from the rear panel
TRIG/SWEEP OUT
socket. The output
is low (0 V) for the duration of the sweep, with narrow 1 V pulses at the marker
frequency.
Note that the marker pulse width is that of the duration of that frequency step which has
the closest value to the marker frequency. This means that sweeps with few steps will
have wider markers than those with many steps. Refer to
Frequency Stepping Resolution
below for additional information.
Setting Sweep Mode, Ramp Time and Source
Pressing the
FIELD
keys to move the cursor through each editable field of the first page
of the sweep menu eventually steps the cursor onto the second page:
MODE=BEG-END LAW=LOG
RAMP TIME=0.05 S
TRIG SRC=CONTINUOUS
MORE->>>
Pressing the left
FIELD
key with the cursor in the first (
MODE
) field will return the edit
cursor to the last field on the first page of the sweep menu. Pressing the right
FIELD
key
will step the cursor through all the editable fields up to
TRIG SRC
(trigger source);
one more press returns the cursor to the first field of the first page.
Pressing
ESCAPE
always exits the edit menu and returns to the main menu.
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