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340CD Diameter 200mm high stability variable frequency optical chopper 5Hz to 220Hz frequency beam experiment
Scitec Instruments Model 340CD is a highly stable variable frequency optical chopper. The basic system consists of a control unit, a chopper head and one of two chemical blackened lithography disks. The system works in the frequency range of 5 Hz to 220 H, depending on the choice of disc.
Other discs and accessories can be selected to meet individual needs.

340CD Diameter 200mm high stability variable frequency optical chopper 5Hz to 220Hz frequency beam experiment
characteristic
The model 340CD is an optical chopper based on a 200 mm diameter disc. The larger disc size allows larger diameter beams to be cut note that it does not allow smaller diameter beams to be cut at a faster rate
Chopper system has the option of two 200mm discs

340CD Diameter 200mm high stability variable frequency optical chopper 5Hz to 220Hz frequency beam experiment
The chopper frequency can be controlled externally by applying an analog voltage to the “control” BNC. The “reference” BNC provides TTL level output, generated directly from the optical switch on the chopper head. The signal has a constant phase relative to the chopper wave and can be used as a reference for other instruments, such as lock-in amplifiers.

340CD Diameter 200mm high stability variable frequency optical chopper 5Hz to 220Hz frequency beam experiment
Product specification
340CDU control unit

Output voltage	Maximum 15V DC
Stability	Soil 0.01%/°C
Frequency control	Internal – manual control via 10 RPM potentiometer. External – BNC connector for 0 to 15V.
Frequency readout	5-bit 14mm LED display with resolution of 0.01HZ, resolution of 0.1HZ or 1HZ, depending on frequency.
Frequency stability	short term – see Phase jitter. Long Term – 0.1% of maximum frequency
Reference output	5V HCT TTL signal through BNC socket.
Power requirements	100-130V or 200-260V AC, 50 or 60HZ, 12 VA
Dimensions	254(W) X76(H) X178(D) mm.
Weight	2.6kg

340CD Diameter 200mm high stability variable frequency optical chopper 5Hz to 220Hz frequency beam experiment
340H behead

Motor	11 pole DC motor, sleeve bearing life more than 6000 hours, can be converted 0-6000 RPM
Reference sensor	IR wire and phototransistor pair Schmidt flip-flop
discless mounting	Optical handle – adjustable between 6.5 and 14.0mm. Mounting holes – 2 x 3mm.
size	122(H) x 75(L) x 40(W) mm

340D cut CD

Optical disc type	2 and 4 slots
Material	semi-hard brass, 1mm thick
Diameter	200mm
Surface treatment	chemical blackening Mark to space ratio: 1 to 1, one blade

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