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Model 340CD Optical Chopper

Model 340CD Optical Chopper

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, 2 slot or 4 slot, which needs to be selected when ordering. The 340P Blade Protector is now included as standard as it provides protection both to the user and the chopper disc, as well as making the chopper head more stable.

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

200mm Chopper Head340H Chopping Head

  • Motor 11 pole DC motor, sleeve bearings with more than 6000 hours lifetime, 0-6000 rpm reversible
  • 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, 1mm thick
  • Diameter 200mm
  • Surface Finish Chemically blacked
  • Mark to Space Ratio 1 to 1 with one blade