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Operating Procedure - HP 450A Operating And Servicing Manual

Hp 450a amplifier serials prefixed: 010
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Section II
Paragraphs 2-8
to
2-11
avoid this situation, select one ground path from a
group of instruments connected together, and permit
no other ground path
to
the power line ground.
Grounding one of the instruments may give less ripple
trouble than grounding any other; or ungrounding all
instruments may give lowest line-frequency modu-
lation of the desired signal.
2-8. POWER CABLE. The plug on the power cable
has a round grounding terminal combined with stand-
ard, 2-prong plug.
If
the ac outlet will not accommodate
this plug, an adapter must be used. The round pin on
this plug grounds the amplifier chassis.
When the
adapter is used, the chassis connection is a pigtail
lead extending from the adapter, which should becon-
nected
to
a grounded ac outlet mounting box
to
ground
the chassis.
2-9. POWER LINE VOLTAGE. The
amplifier is
shipped from the factory for operation on 11S-volt
2-2
Model4S0A
ac power, unless otherwise specified.
The power
transformer can be reconnected for use on 230-volt
power by connecting its dual primary windings in
series as shown on the schematic diagram, note 1.
After such conversion, replace the 0.8-ampere fuse
with an 0.4-ampere slow-blow fuse.
2-10.
OPERATING PROCEDURE.
2-11. The only operating precaution
to
be kept
in
mind are the instructions in paragraphs 2-S and 2-6
regarding excessive dc voltages.
For operation in
undesirable
atmospheric
conditions, provide any
physical protection possible to prevent mechanical
damage, and operate amplifier as usual.
Do not
obstruct ventilating louvers. The power cord may be
left connected to the power source during periods of
non-operation.
00001-1

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