CAUTION
Line Voltage
Fuse Rating
Part No.
100V/120V 3A Slow 2110-0381
220V/240V 2A Slow
2110-0303
USE ONLY THE CORRECT FUSE FOR THE LINE VOLTAGE SELECTED. MAKE
SURE THAT ONLY FUSES WITH THE REQUIRED CURRENT RATING AND OF
THE SPECIFIED TYPE ARE USED AS REPLACEMENTS. NEVER USE A MEN-
DED FUSE AND NEVER SHORT-CIRCUIT THE FUSE HOLDER.
100V/120V
Operation
CI
220V/240V
Operation
-100V-
120V- -
t-220V- -
240V- -
3AT
250V-
1(0
2AT
250V-
-100V- 3AT
250v-
--120V-
I220V-
240V- 2AT
250V-
1-3-3. POWER CABLE
Line Voltage Selection
Set the VOLTAGE SELECTOR switch to the
required line voltage.
Fuse Removal
Turn the fuse holder counterclockwise until it
pops out of the holder.
Figure 1-2. Line Voltage and Fuse Selection
To protect operating personnel, the National Electrical Manufacturer's Association (NEMA)
recommends that the instrument panel and cabinet be grounded. The 4278A is equipped
with a three-conductor power cable that, when plugged into an appropriate AC power recep-
tacle, grounds the instrument. The offset pin on the power cable is ground.
To preserve the protection feature when operating the instrument from a two contact outlet,
use a three-prong to two-prong adapter (HP PN 1251-8196) and connect the green pigtail on
the adapter to the power-line ground.
CAUTION
THE POWER PLUG MUST BE PLUGGED INTO AN OUTLET THAT PROVIDES A
PROTECTIVE EARTH CONNECTION. DO NOT USE AN EXTENSION CORD OR
POWER CABLE THAT DOES NOT HAVE A PROTECTIVE GROUND.
Figure 1-3 shows the available power cords used in various countries. Also shown is the
standard power cord furnished with the instrument. HP part numbers, applicable standards
for power plugs, electrical characteristics, and the countries using each power cord are
listed in Figure 1-3. For assistance in selecting the correct power cable, contact the nearest
Hewlett-Packard sales office.
1-3
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