INFICON CrystalTwo Switch - Manual (Page 2)

INSTRUCTION SHEET
CrystalTwo Switch
IPN 074-380-P1C
2 of 4
Accessories . . . . . . . . . . . . . . . . . . . two 6” (152.4 mm) male-male BNC cables for
attachment between CrystalTwo and
feedthroughs. Alternatively, a CrystalTwo Switch
with two 20” (508 mm) male-male BNC cables can
be purchased.
Weight . . . . . . . . . . . . . . . . . . . . . . . 3.5 oz. (100 g)
Compatibility
The CrystalTwo Switch is compatible with all ModeLock Deposition Controllers. Refer to
your instrument operating manual for crystal switching details.
Installation
See Figure 1 and Figure 2 . The CrystalTwo Switch requires 24 volt power to switch the
XIU to XTAL 2. In the un-powered condition the electrical connection is between the XIU
and XTAL 1. The 24 volt power may be either polarity of DC or AC; the inline rectifier
package insures that the switch is properly powered.
There are two 6” or two 20” BNC cables shipped with each CrystalTwo Switch. These
are to be used to connect the two outputs (XTAL 1 & XTAL 2) to the feedthrough of the
appropriate transducer. It is suggested that the cable supplied with the XIU be used to
connect the XIU to the terminal marked XIU on the CrystalTwo switch.
Rigidly mounting the switch is suggested, especially if there is a possibility of frequent
movement of the cables. There are 6 threaded mounting holes available for permanently
mounting the CrystalTwo Switch. Four #6-32 holes are available on the hexagonal base
and two #10-32 holes are available on one side face.
Integration With Controller
Coordination of the CrystalTwo Switch with the deposition process is very
straightforward. Use the Crystal Switch relay function with normally open contacts and
parallel the CrystalTwo Switch’s control wires with those of the Shutter Actuator control
valve. This will transfer electrical contact to the backup transducer as the shutter
exposes it.
It is normal for the controller to not use the information from the new crystal immediately
as it takes about one second for the measurement system to acquire and optimize the
resonance. There is also a built-in delay to allow the freshly exposed crystal to thermally
stabilize. This switching sequence normally lasts 5-6 seconds.