Fluke DDS Function Generator 271, Руководство пользователя

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271
Users Manual
15-2
Introduction
Some examples of the many waveforms that can be generated by this instrument are
given in the following sections. To make the examples a useful means of gaining
familiarity with the generator, numeric values have been chosen which are convenient for
displaying the waveforms on an oscilloscope.
To work through the examples connect
MAIN OUT
from the generator to a Y input of
the oscilloscope through a 50 Ω terminator.
Default Settings
There are many ways of configuring the waveform, trigger or modulation settings which
might result in the instrument appearing not to work. Under such circumstances the
simplest means of restoring operation is to recall the default settings by pressing
RECALL
,
0
,
ENTER
, followed by the
OUTPUT
key to turn the
MAIN OUT
on.
Simple Main Generator Operation
With the main menu displayed, press
FREQ
,
1
,
kHz
to set the output frequency to
1 kHz, then press
AMPL
,
1
,
0
,
V
to set the amplitude to 10 V p-p into a high-impedance
load. With a 50 Ω load, the amplitude will be 5 V p-p (2.5 V peak).
Select
SINE
on the uppermost
FUNCTION
key.
If the
OUTPUT
lamp is not lit, press
OUTPUT
to turn it on.
Set the oscilloscope to 1 V/div, the timebase to 200 µs/div, select dc coupling and
observe the waveform.
Select the other waveforms in turn using the
FUNCTION
keys and observe the
differences between
SQUARE
and the two
PULSE
options. The oscilloscope trigger
may need resetting when changing between wave shapes. Select
STAIR
and
ARB
itrary
wave shapes to view the default settings.
With
SINE
or
TRIANGLE
selected, move the flashing edit cursor into the numeric field
of the
VhiZ
value using the
FIELD
keys. Using the
DIGIT
keys move the cursor
through the numeric field to the digit representing
0.
1V increments, then adjust the
amplitude with the rotary control. Using the keyboard enter
1
,
0
,
V
to restore the output
level to 10 V p-p.
Move the cursor to the
SYM
metry field with the
SYMMETRY
key, and observe the effect
of adjusting symmetry with the rotary control. Restore 50 % symmetry by entering
5
,
0
,
%
, from the keyboard.
Pulse Trains
To demonstrate simple pulse waveforms for digital applications, select
+PULSE
and
press
AMPL
,
4
,
V
, then
DC OFFSET
,
0
,
.
,
8
,
V
, then
FREQ
,
1
,
kHz
.
This setting will give the standard TTL levels of 2.4V and 0.4V (into 50 Ω ) as a 1:1 duty
cycle 1 kHz pulse train.
Move the cursor to the
SYM
field with the
SYMMETRY
key and adjust the symmetry
with the rotary control to create pulses with different mark:space ratios.
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