Safety Summary
The following general safety precautions must be observed during all
phases of operation, service, and repair of this instrument. Failure to
comply with these precautions or with specic warnings elsewhere in
this manual may impair the protection provided by the equipment. In
addition it violates safety standards of design, manufacture, and intended
use of the instrument. Hewlett-Packard Company assumes no liability for
customer's failure to comply with these requirements.
NOTE
HP 4155A/4156A comply with INSTALLATION CATEGORY II and
POLLUTION DEGREE 2 dened in IEC 1010-1.
HP 4155A/4156A are INDOOR USE products.
GROUND THE INSTRUMENT
To minimize shock hazard, the instrument chassis and cabinet must
be connected to an electrical ground. The power terminal and the
power cable must meet International Electrotechnical Commission
(IEC) safety standards.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of ammable gases
or fumes. Operation of any electrical instrument in such an
environment constitutes a denite safety hazard.
KEEP AWAY FROM LIVE CIRCUITS
Operation personnel must not remove instrument covers. Component
replacement and internal adjustments must be made b
y qualied
maintenance personnel. Do not replace components with power cable
connected. Under certain conditions, dangerous voltages may exist
even with the power cable removed. To avoid injuries, always
disconnect power and discharge circuits before touching them.
DO NOT SERVICE OR ADJUSTALONE
Do not attempt internal service or adjustment unless another person,
capable of rendering rst aid and resuscitation, is present.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT
Because of the danger of introducing additional hazards, do not
install substitute parts or perform any unauthorized modication to
the instrument. Return the instrument to a Hewlett-Packard Sales
and Service Oce for services and repair to ensure that safety
features are maintained.
DANGEROUS PROCEDURE WARNINGS
Warnings, such as example below, precede potentially dangerous
procedures throughout this manual. Instructions contained in the
warnings must be followed.
WARNING
Dangerous voltages, capable of causing death, are present in this
instrument. Use extreme caution when handling, testing, and adjusting.
Safety Symbols
The general denitions of safety symbols used on equipment or in
manuals are listed below.
L
Instruction manual symbol: the product will be marked
with this symbol when it is necessary for the user to
refer to the instruction manual in order to protect
against damage to the instrument.
Indicates dangerous voltage (terminals fed from the
interior by voltage exceeding 1000 volts must be so
marked).
K
Indicates earth (ground) terminal.
Frame or chassis terminal. A connection to the frame
(chassis) of the equipment which normally includes all
exposed metal structures.
A
Alternating current.
F
Direct current.
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