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this
manual.
It
is
recommended
tiiat
a one-half
hour
warm-
up
period
be allowed
for
the
associated
equipment
to reach
a
stabilized
opa-ating temperature,
and
for the
Model 144
to
attain stated accuracies.
2.5.1
Operation
as a
Function Generator
1.
Properly terminate the 50S2
OUT
connector.
2.
Select desired
output
waveform
using the
WAVE-
FORM
SELECTOR
switch.
3.
Set the generator
mode
switch to
CONT.
4.
Set
FREQ HZ
switch to
desired multiplier.
5.
Set
FREQ
DIAL
to desired
setting
by
aligning
with
Index.
6.
Set
30
V
P P
MAX
and
OUTPUT ATTEN
switch
for
desired
output
level
and
amplitude.
For
retorence,
the following
table gives
the
approximate
output amplitude
levels
at attenuator
settings.
The
output
levels
of the
positive
and
negative pulse
waveforms
are
one-half
of
these
levels.
TABLE
2-1
Attenuator
Position
Peak-to-Ptok
Output
into
50£2
load.
Maximum
(Vernier
full
CW)
Minimum
OdB
15
volts
1.5
V
-lOdB
5
volts
500
mV
-20
dB
1.5 volts
150
mV
-30 dB
500
mV
50
mV
-40 dB
150
mV
15
mV
-50 dB
50
mV
5
mV
-60 dB
15
mV
1.5
mV
7.
With
DC OFFSET
set
to
0
detent
position
and
SYM-
METRY
control
set
to
NORM,
the
output waveform
should be
a
symmetrical
waveform
oscillating
around
a
zero
dc
reference point.
(Except
when
in
a
posi-
tive
or
negative pulse
position.)
8.
Select
the
polarity
of
dc
offset desired
and
the
amount
of
offset
using the
rear
panel control.
If
an
excessive
amount
of
dc
offset
is
used,
waveform
clipping
may
be observed.
The sum
of
peak wave-
form
voltage
and
the
dc
offset
cannot exceed
the
maximum
rated
output
of
the generator.
For
ex-
ample,
on
the
0
dB
attenuator
setting
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
9.
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.
2-5
12/70(
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