Safety Symbols - Keysight E4990A Help Manual

E4990A Help
replacement and internal adjustments must be made by qualified
maintenance personnel. Do not replace components with the power
cable connected. Under certain conditions, dangerous voltage levels
may remain even after the power cable has been disconnected. To
avoid injuries, always disconnect the power and discharge circuits
before touching them.
DO NOT Service or Adjust the Instrument Alone
•
Do not attempt internal service or adjustment unless another person,
capable of rendering first aid and resuscitation, is present.
DO NOT Substitute Parts or Modify the Instrument
•
To avoid the danger of introducing additional hazards, do not install
substitute parts or perform unauthorized modifications to the
instrument. Return the instrument to an Agilent Technologies Sales
and Service Office for service and repair to ensure that safety
features are maintained in operational condition.
Dangerous Procedure Warnings
•
Warnings, such as the example below, precede potentially dangerous
procedures throughout this manual. Instructions contained in the
warnings must be followed.
are present in this instrument. Use extreme caution when
handling, testing, and adjusting this instrument.

Safety Symbols

Instruction Manual symbol: the product is marked with this
symbol when it is necessary for the user to refer to the
instrument manual.
Alternating current.
Direct current.
On (Supply).
Off (Supply).
8
Dangerous voltage levels, capable of causing death,