Safety Symbols - HP 4934A Operating And Calibration Manual

physical damage, excessive moisture, or any other reason, REMOVE POWER and
do not use the product until safe operation can be verified by service-trained
personnel. If necessary, return the product to a Hewlett-Packard Sales and Service
Office for service andrepair to ensure the safety features are maintained.
DO NOT substitute parts or modify equipment: Because of the danger of
introducing additional hazards, do not install substitute parts or perform any
unauthorized modification to the product. Return the product to a Hewlett-Packard
Sales and Service Office for service and repair to ensure the safety features are
maintained.
Safety Symbols
The following symbols on the instrument and in the manual indicate precautions
which must be taken to maintain safe operation of the instrument.
Safety Symbols
A
The Instruction Documentation Symbol. The product is marked
with this symbol when it is necessary for the user to refer to the
instructions in the supplied documentation.
Indicates the field wiring terminal that must be connected to earth
ground before operating the equipment - protects against electrical
shock in case of fault.
rh OR J_
Frame or chassis ground terminal - typically connects to the
equipment's metal frame.
Alternating current (AC)
Direct current (DC)
A
Indicates hazardous voltages
General Information 3-3