INFICON Cygnus Thin Film Deposition Controller - Manual (Page 148)

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Cygnus Operating Manual
6.2.2 Connections to Earth Ground
There are two earth connectors:
 The ground connection on the controller is a threaded stud with a hex nut. One
suggestion is to connect a ring terminal to the ground strap, thus allowing a
good connection, and easy removal and installation. See
Figure 6-3 for the
suggested method of grounding.
 This instrument is also connected to earth via a sealed three-core 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 conductor.
WARNING - Risk Of Electric Shock
Never interrupt the protective earthing intentionally. Any
interruption of the protective earth connection inside or
outside the instrument, or disconnection of the
protective earth terminal is likely to make the instrument
dangerous.
This symbol indicates where the protective earth ground
is connected inside the instrument. Never unscrew or
loosen this connection.
CAUTION
An external ground connection is required to ensure
proper operation, especially in electrically noisy
environments.
When used with RF powered sputtering systems, the grounding method may have
to be modified to the specific situation. An informative article on the subject of
Grounding and RFI Prevention was published by H.D. Alcaide, in “Solid State
Technology”, p.117, April, 1982.