Lake Shore Cryotronics 121, User Manual

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6 CHAPTER 1: Introduction
FIGURE
1-1 Safety symbols
!
Direct current (power line) Equipment protected throughout
by double insulation or reinforces
insulation (equivalent to Class II of
IEC 536—see Annex H)
CAUTION: High voltages; danger of
electric shock; background color:
yellow; symbol and outline: black
CAUTION or WARNING: See
instrument documentation;
background color: yellow;
symbol and outline: black
Off (supply)
On (supply)
Frame or chassis terminal
Protective conductor terminal
Earth (ground) terminal
3
Three-phase alternating current (power line)
Alternating or direct current (power line)
Alternating current (power line)