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340CD Large Rotating Disc Optical Chopper

340CD 200mm Optical Chopper SystemFeatures

 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.

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

2 slot 200mm disc4 slot 200mm disc

r, a, b & d aperturesFrequency Range:

Disc

Frequency (Hz)

Aperture

Phase Jitter, Max

r

a

b

d

340D2
(2 slots)

5 - 110

78.0

153.9

31.4

78.0

TBA

340D4
(4 slots)

10 - 220

78.0

77.0

15.7

54.2

TBA

Ordering Information

Model 340CD

 A complete optical chopper system with frequency display includes: 340CDU Control Unit, 340H Chopping Head, 340I Interconnecting Cable, a single 200 mm chopping disc (please select on order) and IEC mains lead.

Accessories

Blade Protector

340P 200 mm Blade Protector

Useful Documents

pdf

Model 340CD Datasheet - pdf (202K)

Drawings

340 Chopping Head L Bracket Drawing

340H - Chopping Head L Bracket Drawing

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