MKS Instruments UK Ltd
Microvision2 Hardware Manual – SP101015.102 August 2010
12
This is a low voltage (+5V, 1mA) contact. The contact should be closed for normal operation, open to trip
the filaments, or if the protective equipment is switched off.
2. Open collector TTL drive
The output transistor should be on for normal operation, off for trip, or if the protective equipment is turned
off.
3. Totem pole TTL drive
The signal should be low for normal operation, high for a trip condition, or if the protective equipment is
switched off.
The external trip circuitry is galvanically isolated from the system ground. The maximum common mode
voltage is 60V DC or peak AC, current limited to 2mA.
4.2 Audio Socket
This is a 2.5mm jack socket. It is used to connect headphones or an external amplified speaker so that
audio tones generated in some of the modes can be heard. E.g. Leak checking tone and audio alarms.
The minimum load impedance should be 8 ohms and the power handling is 2 watts max.
4.3 Emission Indicator
The indicator is lit when a filament is active and within correct operating parameters.
4.4 Multiplier Indicator
The indicator is lit when power is supplied to the multiplier detector (if fitted).
4.5 Power Indicator
The indicator is lit when power is supplied to the Microvision2
unit.
