HP 7470A Service Manual page 5

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Safety
Symbob
Genenl Definitions of Safety Symbols Used On Equipment
International caution symbol (refer to manual): 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.
4
Indicates dangerous voltage (terminals fed from the interior by
voltage exceeding
1000
volts must be so marked).
Protective conductor terminal. For protection against electrical
shock in case of a fault. Used with field wiring terminals to indi-
cate the terminal which must be connected to pound before
operating equipment.
Low-noise or noiseless, clean pound (earth) terminal. Used for a
signal common, as well
as providing protection against electrical
shock in case of a fault. A terminal marked with this symbol must
be connected to ground in the manner described in the installation
(operating) manual, and before operating the equipment.
Frame or chassis terminal. A connection to the frame (chassis) of
lj7
O R
A
the equipment which normally includes all exposed metal struc-
tures.
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Alternating cunent
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0 0 0
Direct cuxrent
G
Alternating or direct current
The WARNING sign denotes a hazard. It calls attention to a pro-
cedure, practice, or the like, which, if not correctly performed or
adhered
to,
could result in personal injury.
The CAUTION sign denotes a hazard. It calls attention to an op-
erating procedure, practice, or the like, which if not correctly
performed or adhered to, could result in damage to or destruction
of part or all of the product.
Revision A: October
1986