A complete optical chopper system with frequency display includes: SCT-300CD Control Unit, SCT-300H Chopping Head, SCT-300I Interconnecting Cable, SCT-300D Set of Chopping Discs and IEC mains lead
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SCT-300CD is a high stability variable frequency optical chopper. The basic system consists of a control unit, a chopping head and set of four chemically blacked photo etched discs. This system provides operation over the frequency range 5 Hz to 3 kHz. A wide selection of additional discs and accessories is available to extend the frequency range and to satisfy individual requirements.
The SCT-300CD control unit has a 5-digit display of the chopping frequency. Chopping frequency can be controlled externally by applying an analogue voltage to a „Control“ BNC. A „Reference“ BNC provides a TTL level output, generated directly from the opto-switch on the chopping head. This signal has constant phase relative to the chopping action and can be used as the reference for other instruments such as lock-in amplifiers.
The SCT-300H optical chopper chopping head supplied with the standard system may be bench bolted or provided to enable parts, such as a high frequency accessory or blade protector, to be attached. For lower frequency operation, the chopper head can be fitted with a reduction gearbox motor.
The set of four chopping discs included with the system (part number SCT-300D) provides a choice of 2, 5, 10 and 30 slots, each having 1:1 mark to space ratio. Variable apertures can be achieved by mounting two identical discs simultaneously. Additional discs, with up to 445 slots, are available to extend the chopping frequency up to 40 kHz. Although the standard discs are chemically blacked other finishes, such as gold plating, are available.
Phase Jitter, Max
5 – 200
12.5 – 500
25 – 1000
75 – 3000