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SYMMETRY CONTROL AT
NORM
2.5.2
Operation
as a
Voltage Controlled Generator
SYNC
TRIANGLE
SINE
SQUARE
POSITIVE
PULSE
NEGATIVE PULSE
]
0
0 -
SYNC
SYMMETRY CONTROL AT
CW
0
-
TRIANGLE
SINE
SQUARE
POSITIVE
PULSE
I
[
J-
I
—
—
—
NEGATIVE PULSE
^
SYMMETRY CONTROL AT CCW
SYNC
0-1
P-
1
TRIANGLE
SINE
SQUARE
POSITIVE
PULSE
"
—
'
NEGATIVE PULSE
|
Figure 2-3
-
Waveform
Phasing
and
Symmetry
Control
The
VCG
input
connector can be used
to externally control
the
frequency of
the generator.
If
a
positive voltage
is
applied to the
VCG
input terminal the
frequency
will
increase
from
the
dial
setting.
A
negative voltage
will
cause
the
frequency
to decrease
from
the
dial setting.
The
VCG
range of the
Model 144
is
1000:
1.
On
any
range
multiplier
setting,
the
frequency can
be
controlled
from
.01
x
the
multiplier
to
10 x
the
multiplier.
The nomograph
of
Figure 2-4
shows
the
characteristics
of the
VCG
circuit.
Column
A
gives
the frequency
dial setting,
column
B,
the
VCG
voltage
and column
C, the
resultant
frequency
of the
generator.
MAIN DIAL
VCG
IN
50S2
OUT
SETTING
VOLTAGE
FREQUENCY
Figure 2-4
-
VCG
Voltage-to-Frequency
Nomograph
2-6
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