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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
the
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.
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