IG9972BEN (2017-09) Plug-In Boards.om
9
Additional protective measures must be taken if certain processes in the
vacuum system (e.g. flashovers) can cause hazardous voltages on the
gauge terminals.
Although the gauge cables are screened, they should not be routed in
parallel to lines producing strong electrical noise.
Connect the gauge to the <IKR> connector. Coaxial cables normally suffice. The
following diagram indicates the conditions under which a triaxial cable is required.
The maximum length of 100 m for coaxial cables is specified by
EN 61010. Greater lengths are not admissible without additional protec-
tive measures.
If the gauge is not grounded via the vacuum chamber, it must be
grounded separately.
If the cable length is >100 m (only admissible with triaxial cable), the
connectors must be protected against unintentional separation and
contact of the center conductor. The cable must only be plugged in or
detached while the unit is switched off for at least 15 seconds.
4.3 Connecting the Cold
Cathode Gauge