INFICON CrystalTwo Switch User Manual

CrystalTwo Switch

Function

The INFICON® CrystalTwo Switch will allow a single Crystal Interface Unit (XIU) to
sequentially communicate to one of two crystal transducers. It may be used with any two
single type sensors or with a single dual sensor. The internal switching mechanism is
designed to minimize any loss of electrical signal through the device to very low levels
and will generally not have any effect on the measurement system’s performance or
crystal (Xtal) life.

Specifications

Part Number

779-220-G1 . . . . . . . . . . . . . . .CrystalTwo Switch with two 6” (152.4 mm)

INSTRUCTION SHEET

BNC cables

IPN 074-380-P1C

779-220-G2 . . . . . . . . . . . . . . .CrystalTwo Switch with two 20” (508 mm)

BNC cables

Input . . . . . . . . . . . . . . . . . . . . . . . . . quantity 1, female BNC

Output . . . . . . . . . . . . . . . . . . . . . . . quantity 2, female BNC

Operating frequency. . . . . . . . . . . . . 6.0 to 4.5 MHz

Insertion loss . . . . . . . . . . . . . . . . . . less than 1 dB at specified operating frequencies

Basic size . . . . . . . . . . . . . . . . . . . . . 1.5” (38.1 mm) hexagonal x 1.139” (28.931 mm)

Thick

Clearance for connectors . . . . . . . . . 2.5” (63.5 mm) radius from hexagon’s center

Mounting . . . . . . . . . . . . . . . . . . . . . 4 ea. #6-32 and 2 ea. #10-32 tapped holes for

mounting in various orientations

Switching voltage . . . . . . . . . . . . . . . 24 V AC or DC nominal, polarity independent

Switching power . . . . . . . . . . . . . . . . 200 mW, nominal

Control wires . . . . . . . . . . . . . . . . . . insulated hookup wire approximately 16”

(406.4 mm) long, inline rectifier module allows use
of AC or reverse polarity hookup

Temperature range. . . . . . . . . . . . . . 0 – 50°C

Humidity . . . . . . . . . . . . . . . . . . . . . . 5 – 85%

Switching time . . . . . . . . . . . . . . . . . less than 0.1 second; exclusive of measurement

instrument’s acquisition, optimization and
stabilization requirements

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CrystalTwo Switch

Accessories . . . . . . . . . . . . . . . . . . . two 6” (152.4 mm) male-male BNC cables for

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.

INSTRUCTION SHEET

attachment between CrystalTwo and
feedthroughs. Alternatively, a CrystalTwo Switch
with two 20” (508 mm) male-male BNC cables can
be purchased.

IPN 074-380-P1C

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.

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