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' i
1
f
1
1
3
- l
-l
-I
-l
-l
-l
-l
-l
I t
f- ,l
l--l
:-;
-I
I
Bach VFG unit
has eleven adjustments;
They are tff
f(X)
potentiometers to adjust the output of curye heigh't between
unitary,
incremental
inPuts of X.
lnlhen used in the tvFG combjned node the first
pots of t'he
-VFG and +VFG are interdePendent.
The first
potentiometer pennits the operator to set the
value of f(X)
(at X=0) within
the range of
+100 to -100 vol-ts.
The remai-ning F(X) potentiometers
(tO to fOO) perrnit the operator
to set the change of the height to each preceding segnent by a
voltage of zero to tl-OO volts.
Figure 2,7-12 is a sample output curve of a +VFG.
This cunre is used as the basis for the typical
VFG set-up pro-
n a Ä r r r a
The foll_owing procedure is for the set-up of a +vtrG patched
as shown on Figure 2.7-12.
The set-up adjustments of the +VFG
nust be started
at X{
and contj-nued in sequence to X= +100.
The procedure for -VFG is accomplished 1n a similar
manner, but
starting
at X= -1OO and in sequence to X=0.
llhen setting
up a VTG for combined plus and nintrs inputs
the operator rnust start
at X= -100' dontt roake the set-up of
X=O in plus VFG.
172
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