INFICON SQM-160 Thin Film Deposition Monitor - Manual (Page 15)

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SQM-160 Operating Manual
1.2.2 General Safety Information
WARNING - Risk Of Electric Shock
Do not open the SQM-160 case! There are no
user-serviceable components within the SQM-160 case.
Dangerous voltages may be present whenever the power
cord or external input/relay connectors are present.
Refer all maintenance to qualified personnel.
CAUTION
This SQM-160 contains delicate circuitry which is
susceptible to transient power line voltages. Disconnect
the line cord whenever making any interface
connections. Refer all maintenance to qualified
personnel.
1.2.3 Earth Ground
The SQM-160 is connected to earth ground through a sealed three-core
(three-conductor) power cable, which must be plugged into a socket outlet with a
protective earth terminal. Extension cables must always have three conductors
including a protective earth terminal.