HP 3457A Service Manual page 4

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PACKARD
Operating and Safety Symbols
Symbols Used On Products And In Manuals
AC line voltage input receptacle.
Instruction manual symbol affixed to product. Cautions the user to refer to
respective instruction manual procedures to avoid possible damage to the
product.
Indicates dangerous voltage — terminals connected to interior voltage
exceeding 1000 volts.
Protective conductor terminal. Indicates the field wiring terminal that must
be connected to earth ground before operating equipment — protects against
electrical shock in case of fault.
Clean ground (low-noise). Indicates terminal that must be connected to
earth ground before operating equipment — for single common connections
and protection against electrical shock in case of fault.
Frame or chassis ground. Indicates equipment chassis ground
rH oon LE ; ; ; :
terminal — normally connects to equipment frame and all metal parts.
Affixed to product containing static sensitive devices — use anti-static
Aas handling procedures to prevent electrostatic discharge damage to ATTENTION
ne components.
NOTE
Calls attention to a procedure, practice, or condition that requires special
attention by the reader.
CAUTION
CAUTION Calls attention to a procedure, practice, or condition that could possibly
cause damage to equipment or permanent loss of data.
WARNING
WARNING Calls attention to a procedure, practice, or condition that could possibly
cause bodily injury or death.
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