HP 16500A Service Manual page 143

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 volt-
age, the correct fuse is installed, and Safety Precautions are
taken (see the following warnings). In addition, note the instru-
ment's external markings which are described under "Safety
Symbols."
Servicing instructions are for use by service-trained person-
nel. To avoid dangerous electric shock, do not perform any
servicing unless qualified to do so.
BEFORE SWITCHING ON THE INSTRUMENT, the protec-
tive 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 pro-
vided 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.
If this instrument is to be energized via an auto-transformer
(for voltage reduction) make sure the common terminal is
connected to the earth terminal of the power source.
Any interruption of the protective (grounding) conductor (in-
side or outside the instrument) or disconnecting the protec-
tive earth terminal will cause a potential shock hazard that
could result in personal injury.
Whenever it is likely that the protection has been impaired,
the instrument must be made inoperative and be secured
against any unintended operation.
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 fusehold-
ers. To do so could cause a shock or fire hazard.
Do not operate the instrument in the presence of flamma-
ble gasses or fumes. Operation of any electrical instrument
in such an environment constitutes a definite safety hazard.
SAFETY CONSIDERATIONS
Do not install substitute parts or perform any unauthorized
modification to the instrument.
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 con-
tacted, result in personal injury.
Any adjustment, maintenance, and repair of the opened in-
strument under voltage should be avoided as much as pos-
sible, and when inevitable, should be carried out only by a
skilled person who is aware of the hazard involved.
Capacitors inside the instrument may still be charged even
if the instrument has been disconnected from its source of
supply.
to protect against damage to the product.
or adhered to, could result in personal injury. Do not proceed
beyond a WARNING sign until the indicated conditions are fully
understood and met.
performed or adhered to, could result in damage to or destruc-
tion of part or all of the product. Do not proceed beyond a CAU-
TION sign until the indicated conditions are fully understood or
met.
SAFETY SYMBOLS
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
Indicates hazardous voltages
Earth terminal (sometimes used in manual to indi-
cate circuit common connected to grounded chas-
sis).
The WARNING sign denotes a hazard. It
calls attention to a procedure, practice, or
the like, which, if not correctly performed
The CAUTION sign denotes a hazard. It
calls attention to an operating procedure,
practice, or the like, which, if not correctly
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