HP 54501A Service Manual page 6

GENERAL - This Is a Safety Class I Instrument (provided
with terminal for protective earthing) .
OPERATION - BEFORE APPLYING POWER verify that the
power transformer primary is matched to the available line
voltage, the correct fuse is installed, and Safety Precautions
are taken (see the following warnings) . In addition, note the
Instrument's external markings which are described under
"Safety Symbols ."
WARNING
o Servicing
Instructions
are for use by service-trained
personnel .
To avoid dangerous electric shock, do not
perform any servicing unless qualified to do so.
oBEFORE
SWITCHING ON
THE INSTRUMENT, the
protective earth terminal of the instrument must be
connected to the protective conductor of the (mains)
powercord .
The mains plug shall 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 a protective
conductor (grounding) . Grounding one conductor of a two-
conductor outlet Is not sufficient protection .
be energized via an
o If this instrument
Is to
auto-transformer (for voltage reduction) make sure the
common terminal is connected to the earth terminal of the
power source .
o Any interruption of the protective (grounding) conductor
(inside or outside the instrument) or disconnecting the
protective earth terminal will cause a potential shock
hazard that could result in personal injury .
o Whenever It is likely that the protection has been impaired,
the instrument must be made inoperative and be secured
against any unintended operation .
o only fuses with the required rated current, voltage, and
specified type (normal blow, time delay, etc .) should be
used .
Do not use repaired fuses or short circuited
fuseholders . To do so could cause a shock or fire hazard .
o Do not operate the instrument in the presence of flammable
gasses or fumes . Operation of any electrical Instrument in
such an environment constitutes a definite safety hazard .
SAFETY CONSIDERATIONS
o Do not Install substitute parts or perform any unauthorized
modification to the instrument.
o Adjustments described in the manual are performed with
power supplied to the instrument while protective covers
are removed .
Energy available at many points may, if
contacted, result in personal injury .
o Any adjustment, maintenance, and repair of the opened
instrument under voltage should be avoided as much as
possible, and when inevitable, should be carried out only by
a skilled person who is aware of the hazard involved .
o Capacitors Inside the Instrument may still be charged even
if the Instrument has been disconnected from its source of
supply .
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 product .
f
SAFETY SYMBOLS
Indicates hazardous voltages .
Earth terminal (sometimes used In manual to
indicate circuit common connected to grounded
chassis) .
The WARNING sign denotes a hazard . It
calls attention to a procedure, practice,
or the like,
which, if not correctly
performed or adhered to, could result in personal injury . Do
not proceed beyond a WARNING sign until the indicated
conditions are fully understood and met .
WARNING
The CAUTION sign denotes a hazard . It
calls attention to an operating procedure,
practice, or the
like, which, If not0
correctly performed or adhered to, could result In damage to
or destruction of part or all of the product . Do not proceed
beyond a CAUTION sign until the indicated conditions are
fully understood or met .
SC1D984