16
tina80e1 (2012-06)
3.2 Power
Connection
Make sure the vacuum connection is properly made
(
→
13).
DANGER
The gauge may only be connected to power sup-
plies, instruments or control devices that conform
to the requirements of a grounded protective extra-
low voltage (SELV) and limited power source
(LPS), Class 2. The connection to the gauge has to
be fused
4)
.
Ground loops, differences of potential, or EMC problems
may affect the measurement signal. For optimum signal
quality, please do observe the following notes:
•
Use an overall metal braided shielded cable. The
connector must have a metal case.
•
Connect the cable shield to ground at one side via the
connector case. Make sure the connector case has
direct contact to the cable's shield on its whole cir-
cumference. Do not connect the other side of the
shield.
•
Connect the supply common with protective ground
directly at the power supply.
•
Use differential measurement input (signal common
and supply common conducted separately).
•
Potential difference between supply common and
housing
≤
16 V (overvoltage protection).
4)
INFICON controllers fulfill this requirement.
