300C OEM Rotating Optical Chopper
Features
Scitec Instruments Model 300C OEM is a high stability variable frequency optical chopper. The basic system consists of a PCB drive unit, a chopping head and a set of four chemically blacked photo etched discs. This system provides operation over the frequency range 5Hz to 3kHz. A wide selection of additional discs and accessories is available to extend the frequency range and to satisfy individual requirements.
• 5Hz - 3kHz standard optical chopping frequency range (0.015Hz to 40kHz options are available)
• 102mm diameter discs
• Compact optical chopper head
• Low noise and vibration
• Photochemically etched non-magnetic discs
• Variable aperture
• Range of accessories
Tthe 300C OEM PCB drive unit is a basic control unit based on the 300CD control unit, it doesn't have a display as the 300CD but still provides the same functionality and performance. 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
300C OEM PCB Drive Unit
Output Voltage: 15 VDC Maximum.
Stability: ±0.01%/°C
Frequency Control: Internal - Manual Control via turn potentiometer. External - BNC connector for 0 to 15V.
Frequency Stability: Short term - see phase jitter. Long term - ±0.1% of maximum frequency.
Reference output: 5 V HCT TTL signal via BNC socket.
Power Requirement: 24 VDC
Dimensions: 60 x 80
Weight: 71 gm
300H Chopping Head
Moter: 11 pole DC motor, sleeve bearings with more than 6000 hours lifetime, 0-6000rpm reversible.
Reference pick-up: IR led and phototransistor pair with Schmitt trigger.
Dimensions: 32 x 75x 73 mm, without disc.
Mounting: Optical stalk - adjustable between 6.5 and 14.0 mm diameter. Mounting holes - 2 x 3 mm
300D Set of Chopping Discs
Disc types: 2, 5, 10 and 30 slot
Material: Half hard brass, 0.5 mm thick
Diameter: 102 mm
Surface Finish: Chemically blacked
Mark to Space Ratio: 1 to 1 with one blade
Frequency 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 OEMA complete optical chopper system with frequency display includes: 300C OEM Control Unit, 300H Chopping Head, 300I Interconnecting Cable and 300D Set of Chopping Discs.
商品属性 [频率] 5Hz to 3kHz