INFICON Gemini ATM to Ultra-High Vacuum Gauge - Manual (Page 32)

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4.3 Put MAG50x Into Operation
Caution
Turn on the gauge/high voltage only at pressures
<10
-2 mbar to prevent excessive contamination.
If you are using an INFICON measurement unit for
Compact Gauges with at least two gauge connec-
tions, the cold cathode gauge can be controlled, for
example, by a Pirani gauge.
MAG50x with FCC connector
When the supply voltage is applied and the high voltage is
switched on via pin 7 (low active) or pin 8 (high active), the
measuring signal is available at the signal output.
MAG50x with D-Sub connector
When the supply voltage is applied and the high voltage is
switched on via pin 1 (low active), the measuring signal is avail-
able at the signal output.
4.4 Put MPG50x Into Operation
When the supply voltage is applied, the measuring signal is
available at the signal output (
→  28).
Allow for a stabilizing time of approx. 10 min. Once the gauge
has been switched on, it can remain in operation permanently
irrespective of the pressure.
Measurement Principle, Measuring Behavior
The gauge consists of two separate measuring systems (Pirani
and cold cathode system according to the inverted magnetron
principle). They are combined in such a way that for the user,
they behave like one measuring system.