8.3
Line Voltage Changes
The Model FG3B Sweep/Function Generator is hard soldered intemally to a particular line
voltage selection. This selection must
be
changed only
if
operation on a different AC line voltage
is
required. Use the following procedure
to
change the line voltage requirements
of
the instrument:
A. Disconnect
th
e power cord from the rear panel connec tor.
DANGER! Never attempt
to
open the instrument
or
change the Iine voltage selector
when AC power is present.
B.
Use a Phillips screwdriver to remove the four screws from the case. Lift off the bottom
half case, exposing the circuitry.
C. The Iine voltage selection is located between the power transformer and the side
of
the case.
If
the unit is originally set for 117V AC, there are two jumpers soldered into the board (zero
ohm resistors).
D. To change the unit
to
234VAC operation, these two jumpers must be removed and one
of
them soldered into the space labeled 234 V (between the two 117V jumper spaces).
WARNING!
Make certain the proper jumper wire is selected. Using the 117V connection and
powering the instrument from a 234 V line will cause extensive damage.
E.
The fuse is
in
the rear corner
of
the instrument. Carefully pry it out with a screwdriver,
and replace with a unit
of
the proper value.
NOTE:
For 117V operation use a 0.5A, 3AG unit.
For 234V operation use a 0.25A, 3AG unit.
33
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