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SECTION 11
Model 4277A
2-12.
To preserve the protection feature when
operating the instrument from a two contact
outlet, use a three prong to two prong adapter
(HP Part No. 1251-8196) and connect the green
pigtail on the adapter to power line ground.
CAUTION
THE MAINS PLUG MUST ONLY BE
INSERTED
IN
A
SOCKET
OUTLET
PROVIDED
WITH
A
PROTECTIVE
EARTH
CONTACT,
THE
PROTECTIVE ACTION MUST NOT BE
NEGATED
BY
THE
USE
OF
AN
EXTENSION CORD (POWER CABLE)
WITHOUT PROTECTIVE CONDUCTOR
(GROUNDING).
2~13.
Figure
2-2
shows
the
available
power
cords, which may be used in various countries
including the standard power cord furnished with
the
instrument.
HP
Part
number,
applicable
standards
for
power
plug,
power
cord
color,
electrical
characteristics
and
countries
using
each power cord are listed in the figure.
If
assistance is needed for selecting the correct
power
cable,
contact
the
nearest
Hewlett-Packard office.
2-14.
INTERCONNECTIONS
2-15.
When an external dc bias source is used,
set the DC BIAS select switch on the rear panel
to
EXT.
The output
from
the
external bias
source should be connected to EXT INPUT/INT
MONITOR connector. The external dc bias fuse
is installed in EXT DC BIAS EUSE Holder on rear
panel to protect the instrument from excessive
current. Fuse rating is as follows:
1/16A, 250V (HP Part No: 2110-0011)
CAUTION
MAKE SURE THAT ONLY FUSES OF
THE
REQUIRED
RATED
CURRENT
AND OF THE SPECIFIED TYPE
ARE
USED FOR REPLACEMENT.
THE
USE
OF
MENDED
FUSES AND
THE
SHORT-CIRCUITING
OF
FUSE-HOLDERS MUST BE AVOIDED.
2-16,
OPERATING ENVIRONMENT
2-17. Temperature.
The
instrument
may be
operated in temperatures from 0 °C to +55 ®C.
2-18.
Humidity.
The
instrument
may
be
operated
in
environments
with
relative
humidities
to
95%
at
40''C.
However,
the
instrument must be protected from temperature
extremes which cause condensation within the
instrument.
2-19.
INSTALLATION INSTRUCTIONS
2-20.
The HP Model 4277A can be operated on
the bench or in a rack mount.
The 4277A is
ready for bench operation as shipped from the
factory.
For
bench
operation
a
two-leg
instrument stand is used. For use, the instrument
stands are designed to be pulled towards the
front of instrument.
1.00V/120V OPERATION
i00V~
120V ~
220V ~
240V
Zh
:>
220V/240V OPERATION
iOOV
120V
220V
240V
IZZ!
FUSE SELECTION
Line Voltage
Fuse Rating
HP Part No.
100V/120V
l.OAT, 250V,
Slow Blow
2110-0007
220V/240V
0.75AT, 250V,
Slow Blow
2110-0360
Figure 2-i. Voltage and Fuse Selection,
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