HP 8340B Manual page 38

SAFETY CONSIDERATIONS
Safety Symbols
Instruction manual
symbol: the apparatus
will be marked with
this symbol when
it
is
necessary for the user
to refer to
the
instruction manual in order to protect the
apparatus against damage.
A
^
Indicates dangerous voltages.
Earth terminal (sometimes used
in manual
to indicate circuit connected to grounded
chassis).
The WARNING
sign denotes
a
hazard.
It calls attention to
a
procedure, practice, or the like,
which,
if not
correctly
per¬
formed
or
adhered
to,
could
result
in injury or loss of life. Do
not
proceed beyond
a
WARN¬
ING 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 not cor¬
rectly performed
or
adhered
to,
could result
in damage to or
destruction of part or all of the
equipment.
Do
not proceed
beyond
a
CAUTION sign
until
the indicated
conditions are
fully understood and met.
£
CAUTION
3
Operation
i 2
CAUTION
BEFORE APPLYING POWER make sure
the instrument's ac input is
set for
the
available ac line voltage, that the correct
fuse
is installed, and that all normal
safety precautions have been taken.
Service
The information, cautions, and warnings in this man¬
ual
must be followed
to ensure safe operation and to
keep the
instrument safe.
SERVICE AND ADJUST¬
MENTS SHOULD BE PERFORMED ONLY BY
QUALIFIED
SERVICE PERSONNEL.
Adjustment or repair of the opened instrument with
the ac power connected should be avoided as much
as possible and, when unavoidable, should be
per¬
formed only by
a
skilled person
who knows the haz¬
ard involved.
Capacitors
inside the instrument
may
still
be charged
even though the instrument has been disconnected
from
its
source of supply
Make
sure only
fuses of the requred current rating
and type (normal blow, time delay,
etc.) are used for
replacement. Fuse requirements are indicated on the
instrument's rear panel. Do not use repaired fuses or
short-circuit fuse holders.
Whenever
it
is likely
that the protection has been
impaired, make the instrument inoperative and
secure
it
against any unintended operation.
WARNING
If this instrument
is to
be energized
through an auto-transformer (for voltage
reduction),
make
sure the common
ter¬
minal is connected
to the
earthed pole
of the power source.
BEFORE SWITCHING ON THE INSTRU¬
MENT, the protective earth terminal of
the instrument
must
be connected to the
protective conductor
of the (mains)
power cord. The mains plug
shall only
be inserted in
a
socket outlet provided
with protective earth contact
The
pro¬
tection action must not
be negated
by
using
an extension cord (power cable)
without
a
protective grounding
conduc¬
tor. Grounding one conductor
of
a two-
conductor outlet
is
not sufficient protec¬
tion.
Any interruption of
the protective
(grounding) conductor, inside or outside
the instrument, or disconnection of the
protective earth terminal
is likely
to
make this instrument dangerous.
Inten¬
tional interruption of the earth ground
is
prohibited. Whenever
it is likely that the
protection has been impaired, the
instrument must
be secured against
any
unintended operation.
Servicing this instrument often requires
that you work with the instrument's
pro¬
tective covers removed and with ac
power connected.
Be
careful; the
energy at many points
in the instrument
may,
if
contacted, cause personal injury.
Assembly-Level Service Overall Instrument
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HP 8340B/41B