1-2. INITIAL INSPECTION
When shipped from the factory, the 4278A meets all of the specifications listed in Section 5.
When you receive your 4278A, inspect the shipping container for damage. If the shipping
container or cushioning material is damaged, it should be kept until the shipment has been
checked for completeness, and the instrument has been verified mechanically and electrical-
ly. The shipping container should contain everything shown in Figure 1-1, The procedures
for checking electrical performance are given in Section 6. If the shipment is incomplete, if
the instrument is damaged in any way, or if the instrument does not pass the Performance
Tests outlined in Section 6, notify the carrier and Hewlett-Packard. Keep the shipping
materials for the carrier's inspection. The HP sales office will arrange for repair or replace-
ment without waiting for the claim to be settled.
1-3. PREPARATION FOR USE
1-3-1. POWER REQUIREMENTS
The 4278A requires a power source of 100, 120, 220V AC -±10°/0, or 240VAC +5% -10%, 48
to 66Hz, single phase; power consumption is 200VA, maximum.
WARNING)
THIS IS A SAFETY CLASS 1 PRODUCT (PROVIDED WITH A PROTECTIVE EARTH
TERMINAL). A NONINTERRUPTABLE SAFETY EARTH GROUND MUST BE
PROVIDED FROM THE MAIN POWER SOURCE TO THE 4278A'S POWER INPUT
TERMINALS, POWER CORD, OR FURNISHED POWER CORD SET. IF THE SAFE-
TY EARTH GROUND BECOMES IMPAIRED, DISCONNECT THE 4278A AND
SECURE IT AGAINST ANY OPERATION. IF YOUR 4278A IS TO BE ENERGIZED
VIA AN AUTOTRANSFORMER FOR VOLTAGE REDUCTION, MAKE SURE THE
COMMON TERMINAL IS CONNECTED TO THE EARTH TERMINAL OF THE
POWER SOURCE.
1-3-2. LINE VOLTAGE AND FUSE SELECTION
CAUTION I
BEFORE CONNECTING THE INSTRUMENT TO THE POWER SOURCE, MAKE
SURE THE CORRECT FUSE IS INSTALLED AND THE LINE VOLTAGE SELEC-
TION SWITCH IS SET TO THE CORRECT VOLTAGE.
Figure 1-2 shows the line voltage selector switch and the fuse holder, and provides instruc-
tions for line voltage and fuse selection. Fuse current ratings are printed on the rear panel
and are listed, along with the fuse's HP part number, in Figure 1-2.
1-2
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