Capacitors inside the instrument may still be charged
1-A. SAFETY CONSIDERATIONS
even though the instrument has been disconnected from
its source of supply.
Make sure only fuses of the required current rating and
type (normal blow, time delay, etc.) are used for
Instruction manual symbol: the apparatus will
replacement. Fuse requirements are indicated on the
be marked with this symbol when it is
instrument's rear panel. Do not use repaired fuses or
necessary for the user to refer to the
short-circuit fuse holders.
instruction manual in order to protect the
apparatus against damage.
Whenever it is likely that the protection has been
impaired, make the instrument inoperative and secure it
Indicates dangerous voltages.
against any unintended operation.
Earth terminal (sometimes used in manual to
indicate circuit connected to grounded
If this instrument is to be energized
The WARNING sign denotes a hazard.
common terminal is connected to the
It calls attention to a
earthed pole of the power source.
practice, or the like, which, if not
correctly performed or adhered to,
could result in injury or loss of life.
INSTRUMENT, the protective earth
Do not proceed beyond a WARNING
terminal of the instrument must be
sign until the indicated conditions are
connected to the protective conductor
fully understood and met.
of the (mains) power cord.
The mains plug shall only be inserted
The CAUTION sign denotes a hazard.
in a socket outlet provided with
It calls attention to an
protective earth contact.
procedure, practice, or the like, which,
protection action must not be negated
if not correctly performed or adhered
by using an extension cord (power
to, could result in damage to or
cable) without a protective grounding
destruction of part or all of the
conductor. Grounding one conductor
equipment. Do not proceed beyond a
of ; two-conductor outlet is not
CAUTION sign until the indicated
conditions are fully understood and
Any interruption of the protective
(grounding) conductor, inside or
BEFORE APPLYING POWER make
disconnection of the protective earth
sure the instrument's ac input is set
terminal is likely to make this
for the available ac line voltage, that
the correct fuse is installed, and that
interruption of the earth ground is
all normal safety precautions have
prohibited. Whenever it is likely that
the protection has been impaired, the
instrument must be secured against
The information, cautions, and warnings in this manual
any unintended operation.
must be followed to ensure safe operation and to keep the
SERVICE AND ADJUSTMENTS
SHOULD BE PERFORMED ONLY BY QUALIFIED
requires that you work with the
Adjustment or repair of the opened instrument with the ac
Be very careful; the
power connected should be avoided as much as possible
energy at many points in the
and, when unavoidable, should be performed only by a
instrument may, if contacted, cause
skilled person who knows the hazard involved.