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300C and 300CD Rotating Optical Chopper

300CD Optical ChopperFeatures

 Die 300er-Serie stellt das Standardprodukt dar. Es ist für den Einsatz in Verbindung mit Ø=102 mm Chopperscheiben konzipiert. Der Frequenzbereich erstreckt sich von 5 Hz bis 3 kHz in der Standardversion. Eine Erweiterung auf 0,015 Hz bis 40 kHz ist möglich.

 

 


Merkmale der Versionen 300C & 300 CD:

Ausgangsspannung: 0-15V DC / ±0,01%/K

Fequenzsteuerung: Intern per Digitalpotentiometer/Extern per BNC

Frequenzstabilität: (kurzfristig/Phasenjitter): ± 1 °/kHz

Frequenzstabilität: (langfristig): ± 0,1 %/Hz

Referenzausgangsspannung: 5V HCT TTL am BNC-Ausgang

Stromversorgung: 100-130V oder 200-260V AC, 50 oder 60Hz, 12 VA

Abmessungen: 254(B) x 76(H) x 178(T)mm

Gewicht: 2,6kg

300CD Discs Two versions of the optical chopper control unit are available. The basic control unit is the 300CU, which has a 10 turn dial for setting the operating frequency. Alternatively, the 300CDU control unit has an additional 5-digit display of the chopping frequency. Other features are common to both control units. Chopping frequency can be controlled externally by applying an analogue voltage to a "Control" BNC. A "Reference" BNC provides a TTL level output, generated directly from the opto-switch on the chopping head. This signal has constant phase relative to the chopping action and can be used as the reference for other instruments such as lock-in amplifiers.

 The 300H optical chopper chopping head supplied with the standard system may be bench bolted or optical stalk (bench rod) mounted. Mountings are provided to enable parts, such as a high frequency accessory or blade protector, to be attached. For lower frequency operation, the chopper head can be fitted with a reduction gearbox motor.

 The set of four chopping discs included with the system (part number 300D) provides a choice of 2, 5, 10 and 30 slots, each having a 1:1 mark to space ratio. Variable apertures can be achieved by mounting two identical discs simultaneously. Additional discs, with up to 445 slots, are available to extend the chopping frequency up to 40kHz. Although the standard discs are chemically blacked other finishes, such as gold plating, are available.

Specifications

300CU Control Unit

Output Voltage: 15V DC Maximum.

Stability: ±0.01%/°C

Frequency Control: Internal - Manual Control via 10 turn potentiometer fitted with a turns counting dial. External - BNC connector for 0 to 15V.

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

300CDU 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

Chopper Head300H Chopperköpfe

Halterung für eine Einzelfrequenz-Chopperscheibe 102 mm

Motor: 11-polig DC

Lebensdauer: > 6000 h

Drehzahl: 0-6000 U/min

Abmessugen: 73(H) x 75(L) x 32(B)mm (ohne Scheibe)

Befestigung: Höhenjustage zwischen 6,5 mm -14 mm

Montagelöcher: 2 x M3

300D Set of Chopping Discs

Disc types: 2, 5, 10 and 30 slot

Material: Half hard brass, 0.5mm thick

Diameter: 102mm

Surface Finish: Chemically blacked

Mark to Space Ratio: 1 to 1 with one blade

r, a, b & d aperturesFrequency Range:

Disc

Frequency (Hz)

Aperture

Phase Jitter, Max

r

a

b

d

300D2
(2 slots)

5 - 200

32.0

77.0

26.7

32.0

±0.2°

300D5
(5 slots)

12.5 - 500

32.0

30.8

10.7

23.1

±0.5°

300D10
(10 slots)

25 - 1000

32.0

15.4

5.4

13.2

±1°

300D30
(30 slots)

75 - 3000

32.0

5.1

1.8

4.8

±3°

Ordering Information

Model 300C

 A complete optical chopper system includes: 300CU Control Unit, 300H Chopping Head, 300I Interconnecting Cable, 300D Set of Chopping Discs and IEC mains lead.

 

Model 300CD

 A complete optical chopper system with frequency display includes: 300CDU Control Unit, 300H Chopping Head, 300I Interconnecting Cable, 300D Set of Chopping Discs and IEC mains lead.

Accessories

200 slot disk

200 slot disk which increases range to 20kHz.

200 slot disk

445 slot disk which increases range to 40kHz.

Blade Protector

Blade protector for the chopping head.

High Frequency Accessory

High frequency accessory enabling a 26mm beam to be modulated at 20kHz.

High Frequency Accessory

High frequency accessory (445) enabling a 10mm beam to be modulated at 40kHz.

Full accessory list.

Useful Documents

pdf

300H Dimensions and Wiring - pdf (25K)

pdf

300I Interconnecting Lead Wiring - pdf (15K)

pdf

300C - 300CD Manual - pdf (82K)

   

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