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 Features
 The Model 340CD is an optical chopper based on 200 mm
diameter discs. The larger disc size allows larger diameter beams to be
chopped. Unfortunately, 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. |
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Specifications
340CDU Control Unit
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Output Voltage: 15V DC Maximum. |
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Stability: ±0.01%/°C |
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Frequency Control: Internal - Manual Control via 10 turn
potentiometer. External - BNC connector for 0 to 15V. |
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Frequency Read Out: 5 digit 14mm LED display with 0.01Hz
resolution, 0.1Hz or 1Hz resolution depending on frequency. |
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Frequency Stability: Short term - see phase jitter. Long
term - ±0.1% of maximum frequency. |
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Reference output: 5V HCT TTL signal via BNC socket. |
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Power Requirement: 100-130V or 200-260V AC, 50 or 60Hz, 12
VA. |
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Dimensions: 254(W) x 76(H) x 178(D)mm |
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Weight: 2.6kg |
 340H Chopping Head
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Motor: 11 pole DC motor, sleeve bearings with more than 6000
hours lifetime, 0-6000 rpm reversible. |
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Reference pick-up: IR led and phototransistor pair with
Schmitt trigger. |
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Dimensions: 122(H) x 75(L) x 40(W)mm, without disc. |
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Mounting: Optical stalk - adjustable between 6.5 and 14.0mm
diameter. Mounting holes - 2 x 3mm |
340D Chopping Discs
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Disc types: 2 and 4 slot |
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Material: Half hard brass, 1mm thick |
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Diameter: 200mm |
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Surface Finish: Chemically blacked |
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Mark to Space Ratio: 1 to 1 with one blade |
 
 Frequency Range:
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Disc |
Frequency (Hz) |
Aperture |
Phase Jitter, Max |
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r |
a |
b |
d |
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340D2
(2
slots) |
5 - 110 |
78.0 |
153.9 |
31.4 |
78.0 |
TBA |
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340D4
(4
slots) |
10 - 220 |
78.0 |
77.0 |
15.7 |
54.2 |
TBA |
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Ordering Information
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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. |
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Accessories
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340P 200 mm Blade Protector |
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Useful Documents
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340CD
Datasheet - pdf (202K) |
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Drawings
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