Keysight 34921A-34925A User’s Guide 3
Safety Symbols
The following symbols or markings that may be on or with the instrument and in
the documentation indicate precautions which must be taken to maintain safe
operation of the instrument.
Alternating current (AC) Caution, risk of electric shock
Frame or chassis (ground) terminal
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
Standby supply. Unit is not completely
disconnected from ac mains when
switch is off
Direct current (DC)
Off (mains supply) On (mains supply)
Three phase alternating current Presence of a laser device
Protective earth (ground) terminal
Equipment protected throughout by
double insulation or reinforced
insulation
Caution, hot surface
Product is sensitive to electrostatic
discharge
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