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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)
Standby supply. Unit is not completely
disconnected from ac mains when
switch is off
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
Off (mains supply)
Three phase alternating current
Protective earth (ground) terminal
Caution, hot surface
Keysight 34937A-34939A User's Guide
Frame or chassis (ground) terminal
Caution, risk of electric shock
Direct current (DC)
On (mains supply)
Presence of a laser device
Equipment protected throughout by
double insulation or reinforced
insulation
Product is sensitive to electrostatic
discharge
3
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