Optical chopper 340CD

The Model 340CD is an optical chopper based on 200 mm diameter discs. The larger disc size allows larger diameter beams to be chopped. Please note that it does not allow smaller diameter beams to be chopped at a faster rate. The chopper system comes with a choice of two 200mm discs. Specifications 340CDU Control Unit • Output Voltage: 15V DC Maximum. • Stability: ±0.01%/°C. • Frequency Control: Internal - Manual Control via 10 turn potentiometer. External - BNC connector for 0 to 15V. • Frequency Read Out: 5 digit 14mm LED display with 0.01Hz resolution, 0.1Hz or 1Hz resolution depending on frequency. • Frequency Stability: Short term - see phase jitter. Long term - ±0.1% of maximum frequency. • Reference output: 5V HCT TTL signal via BNC socket. • Power Requirement: 100-130V or 200-260V AC, 50 or 60Hz, 12 VA. • Dimensions: 254(W) x 76(H) x 178(D)mm. • Weight: 2.6kg. 340H Chopping Head • Motor: 11 pole DC motor, sleeve bearings with more than 6000 hours lifetime, 0-6000 rpm. • Reference pick-up: IR led and phototransistor pair with Schmitt trigger. • Dimensions: 122(H) x 75(L) x 40(W)mm, without disc. • Mounting: Optical stalk - adjustable between 6.5 and 14.0mm diameter. Mounting holes - 2 x 3mm. 340D Chopping Discs • Disc types: 2 and 4 slot • Material: Half hard brass, 1 mm thick • Diameter: 200 mm • Surface Finish: Chemically blacked • Mark to Space Ratio: 1 to 1 with one blade