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6.
With
DC OFFSET
set
to
0 and
SYMMETRY
control
set
to
NORM,
the
output
waveform
should be
a
symmetrical
waveform
oscillating
around
a
zero
dc
reference point.
(Except
when
in
a positive
or nega-
tive
pulse
position.)
7.
Select the polarity of
dc
offset desired
using the
DC
OFFSET
switch,
and
set
the
amount
of
offset using
the
MIN/MAX
control.
If
an
excessive
amount
of
dc
offset
is
used,
waveform
clipping
may
be
observed.
The sum
of
peak
waveform
voltage
and
the
dc
offset
cannot exceed
the
maximum
rated
output
of the
generator.
For example, on
the
0
dB
attenuator
set-
ting
the
maximum
output
is
15
V
peak-to-peak
or
7.5
V
peak above and below
zero
volts.
Offset plus
peak
voltage
cannot exceed
7.5
V. See Figure
2-2.
0
D.C.
OFFSET
NEGATIVE DC OFFSET
Figure 2-2
-
DC
Offset
Control
8.
Set
SYMMETRY
switch/control
for desired
sym-
metry
or
dissymmetry.
The symmetry
control
can be
used to develop
ramp waveforms
with
variable
rise
fall
ratios
and
pulse
trains
with
variable
duty
cycle.
By
using the
sine
wave
with dissymmetry,
controllable
sine distortion
can be developed.
Figure 2-3
shows
the
effect
of
this
control
on output waveforms.
SYNC
SYMMETRY CONTROL
AT
NORM
0
TRIANGLE
SINE
SQUARE
POSITIVE
PULSE
0
NEGATIVE
PULSE
SYMMETRY CONTROL
AT
CW
SYNC
TRIANGLE
SINE
SQUARE
0
-
POSITIVE
PULSE
^
I
|_
NEGATIVE
PULSE
j
I
SYNC
SYMMETRY CONTROL
AT
CCW
0-1
n_
r:::
TRIANGLE
SINE
SQUARE
POSITIVE
PULSE
NEGATIVE PULSE
0-1
0-1
"
Figure 2-3
-
Waveform
Phasing
and
Symmetry
Control
2-4
1
1
/70
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