MKS UniMag 971, Operation And Installation Manual, Page: 8 / 44

971 UniMag ™ Operation manual 5
User Switch
I/O Connector
Red or Green LED Status Indicator
The user switch turns on cold cathode sensor.
Refer to pages 15 for operation procedure.
The cold cathode sensor should only be turned on when vacuum pressure is below 5×10
-3
Torr

If the transducer is delivered with customer specified parameters the User Switch is disabled.
For enabling the switch see page 19.
The red/green LED status indicator has the following stages:
1. GREEN Normal operation
2. 2 sec. RED Power on sequence
3. GREEN 1 sec. flash cycle Test mode TST!ON (see page 19)
4. GREEN 0.5 sec. flash cycle Cold Cathode high voltage turned on
5. Red 0.5 sec. flash cycle Cold Cathode high voltage turned on, but ionization has not
started.
6. RED Sensor failure (see page 31)
7. OFF Power off