Introduction; Purpose Of The Equipment; Specifications - Wavetek 142 Instruction Manual

SECTION
I
INTRODUCTION
1.1
PURPOSE OF THE EQUIPMENT
The Model 142
HF
VCG
Generator provides sine,
square,
triangle, positive pulse,
and negative pulse
outputs (with
a
separate
sync output) over
a
0.0005
Hz
to 10
MHz
fre-
quency
range.
Frequency range selection
is
provided
in
ten decades;
and
a
vernier control
permits
adjustment
to
within
approximately
1%
of the range selected.
The symmetry
of
any output waveform
is
continuously
adjustable
from
1:19 to 19:1
(5%-95%
to
95%-5%).
Pulse
outputs
as
narrow
as
50 nanoseconds having repetition rates
as
high
as
1
MHz
(on-off ratio
as great as 19:1)
can be
generated
in
either polarity.
Varying the
symmetry of the
triangle
function
will
produce
a
sawtooth or
"ramp"
signal
with
a rise
or
fall
time as steep as
50 nanoseconds
at a
recurring rate
of
1
MHz.
Even the
symmetry
of the sine
wave
may
be
varied
over
this
1:19
to 19:1 range
if
desired.
When
the
symmetry
control
is
used,
however, the indicated
frequency
is
divided
by
a
factor of
approximately
10.
A VCG
input allows the
output
to
be frequency
modu-
lated,
dc
programmed,
or
swept
over
a
1000:1
ratio.
The
dc offset of the
30V
p-p
maximum
signal
output can be
controlled
manually
or
electronically.
A
60
dB
calibrated
step
attenuator
and
a
20 dB
vernier
provide an overall
attenuation of
80
dB; permitting
signal
levels as
low
as
1.5
mV
p-p.
Both
the
output
waveform and
the
dc
offset
are attenuated
by the
60
dB
step attenuator.
With
this
instrument
it is
possible to
simultaneously pro-
gram and sweep the
output
frequency, select
the
output
symmetry
desired,
and manually or electronically
vary the
dc
offset.
This capability,
coupled with the variety of
waveforms
available
and
precision
output amplitude con-
trol,
makes
the
Model 142
an
extremely
versatile instru-
ment
for engineering,
manufacturing, and laboratory
appli-
cations.
1.2
GtNERAL PHYSICAL DESCRIPTION
Weighing
approximately
8
pounds
(12
pounds
when
shipped) the
Model 142
is
B-'A
inches wide,
5-'A
inches
high,
and
11-72 inches
deep.
Housed
in a
compact,
ruggedized,
portable
case;
the
Model
142
is
normally
shipped with a 10-foot, 3-wire,
detachable
line
cord
and
one copy of
this
instruction
manual.
1.3
SPECIFICATIONS
1.3.1 Versatility
WAVEFORMS
Selectable
sine
%
,
square
H.J
.
triangle
\/
,
positive
pulse
n_
,
and negative pulse
u"
outputs.
Symmetry
of
all
outputs continuously
adjustable
from
1:19
to 19:1.
Varying
triangle
symmetry
provides
a
sawtooth
/\
or
/A
output. Separate
sync with
vari-
able
symmetry
(see
Sync Output
specifications
below).
OPERATING
FREQUENCY RANGE
0.0005
Hz
to
10
MHz
in
ten
decades as
tabulated below:
Ranges
X.001
0.0005
Hz
to .01
Hz
X.01
0.005
Hz
to
.1
Hz
X.1
0.05
Hz
to
1
Hz
XI 0.1
Hz
to
10
Hz
X10
0.1
Hz
to
100 Hz
X100
1
Hz
to
1
kHz
X1K
.
10
Hz
to
10
kHz
X10K 100 Hz
to
100
kHz
X100K
1
kHz
to
1
MHz
X1M
10
kHz
to
10
MHz
Note:
When Symmetry
control
is
used, indicated
frequency
is
divided
by
a
factor of approximately 10.
MAIN OUTPUT
Sine, square, triangle,
positive pulse,
and
negative pulse;
-
I
»
L.
I
» K
on
\/
r-»
r»
oirr*iilt
beiCULOUIC. IViaAIMIUlM
VJUI|JUL
V K
milw
(15
V
p,
pulse)
with calibrated
15
V
p-p into
50-ohm
load.
Precision
output attenuator calibrated
in
10
dB
steps to
—60
dB with
a
20 dB
vernier, giving an overall
attenuation
of
—80
dB.
Output impedance
is
50-ohms. Short
circuit
current
is
±150
milliamps.
1-1
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