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source. A printed circuit board located within the ac
power module on the rear panel selects the power source.
Voltage choices are available on both sides of the PC
board. Before connecting the instrument to the power
source, check that the PC board selection matches the
nominal line voltage of the source. The operating voltage
that is selected is the one printed on the lower-left side
of the PC board (see Figure 2-5). As shipped from the
factory, the PC board in this unit is positioned for 120Vac
operation. To select another input voltage proceed as
follows:
a. Remove power cable from instrument.
b. Move plastic door on power module aside.
c. Rotate FUSE PULL to the left and remove line
fuse FI.
d. Remove PC board from slot. Select operating
voltage by orienting PC board to position the
desired voltage on top-left side of PC board. Push
board firmly into slot.
e. Rotate FUSE PULL back into normal position and
re-insert fuse FI in holder using caution to select
the correct value for
FI
(125mA for 100V or 120V
and 62.5mA slo-blo for 220V or 240V)..
f. Close plastic door and connect power cable.
2-29
When the instrument leaves the factory, a 125mA
fuse is installed for 120V operation. An envelope contain¬
ing a 62.5mA fuse for 220V/240V operation is attached to
the instrument. Make sure that the correct fuse value for
FI is installed if the position of the PC board is changed.
2-30
Power Cable
2-31
This unit is factory equipped with a power cord
plug that is the most appropriate for the user's location.
The replaceable parts section of this manual lists all of the
power cords associated with this unit. If a different power
cord is desired, contact your nearest HP Sales Office.
2-32
To protect operating personnel, the National
Electrical Manufacturers Association (NEMA) recommends
that the instrument panel and cabinet be grounded. This
instrument is equipped with a three conductor power cable.
The third conductor is the ground conductor and when the
cable is plugged into an appropriate receptacle, the instru¬
ment is grounded. The offset pin on the power cable three-
prong connector is the ground connection. In no event
shall this instrument be operated without an adequate
cabinet ground connection.
2-33
To preserve the protection feature when operating
the instrument from a two-contact outlet, use a three-prong
to two-prong adapter (if permitted by local regulations) and
connect the green lead on the adapter to ground.
2-4
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