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Wavetek 143 - Page 15

Wavetek 143
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The
upper
and
lower
limits
are
defined
by
the
maximum
and
minimum
dial
settings
multi-
plied
by
.
VCG
input
will
not
drive
the
gen-
erator
beyond
the
normal
dial
limits
of
a
range.
FREQUENCY
MULT
Switch
The
outer
knob
selects
one
of
ten
frequency
multipliers
for
the
dial
(2)
setting.
VERNIER
Control
A
fine
adjustment
of
the
frequency
dial
(2)
setting.
Not
GCV
OUT
Connector
(Rear
Panel)
Shown
This
connector
gives
a
0
to
+2V
signal
propor-
tional
to
the
frequency
of
the
generator
within
any
given
range.
The
signal
can
be
used
as
the
X
drive
for
X-Y
recorders.
Not
EXT
DC
OFFSET
IN
Connector
(Rear
Panel)
Shown
Applied
voltage
offsets
the
selected
waveform
lin-
early.
Offset
is
1V
for
each
—1V
applied
with
out-
put
connected
into
ап
open
circuit.
Maximum
input
is
+15V.
Offset
is
affected
by
the
attenuator
©)
3.2
OPERATION
Perform
the
initial
checkout
in
Section
2
for
the
feel
of
the
instrument.
Any
questions
concerning
individual
controls
and
connectors
may
be
answered
in
paragraph
3.1.
3.2.1
Signal
Termination
Proper
signal
termination,
or
loading,
of
the
generator
con-
nectors
is
necessary
for
its
specified
operation.
For
example,
the
proper
termination
of
the
main
output
is
shown
in
figure
3-3.
Placing
the
509
terminator,
or
50Q
resistance,
MODEL
143
OUTPUT
IMPEDANCE
E:
EFFECTIVE
CIRCUIT
RESISTANCE
RG58
OR
EQUIVALENT
A
—
CN
(SIGNAL
LOAD)
OUTPUT
`7
Y
AMPLIFIER
RECEIVING
INSTRUMENT
Figure
3-3.
Signal
Termination
in
parallel
with
a
higher
impedance
matches
the
receiving
instrument
input
impedance
to
the
generator
output
im-
pedance,
thereby
minimizing
signal
reflection
or
power
loss
on
the
line
due
to
impedance
mismatch.
3.2.2
Voltage
Controlled
Function
Generator
Operation
Operation
as
a
voltage
controlled
function
generator
(VCG)
is
as
for
a
manually
controlled
function
generator,
only
the
frequency
within
particular
ranges
is
additionally
controlled
with
dc
levels
(+2V
excursions)
injected
at
the
VCG
IN
con-
nector.
Set
the
frequency
dial
to
a
reference
from
which
the
frequency
is
to
be
voltage
controlled.
T
For
frequency
control
with
positive
de
inputs
at
VCG
IN,
set
the
dial
for
a
lower
frequency
limit.
22
For
frequency
contro!
with
negative
dc
inputs
at
VCG
IN,
set
the
dial
for
an
upper
frequency
limit.
3:
For
modulation
with
an
ac
input
at
VCG
IN,
set
the
dial
at
the
desired
center
frequency.
Do
not
exceed
the
maximum
dial
range
of
the
selected
frequency
range.
Figure
3-4
isa
nomograph
with
examples
of
dial
and
voltage
effects.
Example
1
shows
that
with
OV
VCG
input,
fre-
quency
is
as
determined
by
the
main
dial
setting,
1.0
in
this
MAIN
DIAL
VCG
IN
OUTPUT
SETTING
VOLTAGE
FREQUENCY
FACTOR
2.0
-2.0
.002
1.8
-1.6
2
16
“12
4
E
6
14
8
ате
εχξ
τ
1.2
-
45
8
=
—
a
ES
1.0
NS
N
8
N
+
4
1.2
‘N
6
+
8
1.4
9
N<
4
+1.2
4%,
1.6
20
Ус
2
+1.6
No
18
`
N
.002
+2.0
2.0
Figure
3-4.
VCG
Voltage-to-Frequency
Nomograph
3-3

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