BENTHAM 218M
Features
- Chopping frequencies from 0.5Hz to 4kHz
- Excellent phase jitter and frequency stability
- Long motor life
Datasheet
Bentham-218M-Optical Chopper-datasheet1-703281065.pdf
373 KiB
Extracted Text
218M Optical Chopper In measurement scenarios where the optical signal to be measured may be confounded with a background optical signal, either from ambient lighting, or, in the infrared, heat (or infrared radiation) emitted by instrumentation and the background, a means of discrimination between the two is required. This is achieved by modulating the desired optical signal on a known carrier wave by an optical chopper. The 218M optical chopper consists of a modular control unit coupled by a 2m long lead to the chopping head. Four, easily interchangeable, chopping discs are provided, which allow chopping frequencies in the range of 0.5Hz to 4kHz. A variable aperture 2-slot disc and higher frequency discs are also available. The 218M provides a square wave reference output suitable for use with lock-in amplifiers. The 218M is a single-width module, housed within the 417/T mother unit. Core Features • Excellent phase jitter and frequency stability • Long motor life • Chopping frequencies from 0.5Hz to 4kHz Specification 2-slot disc 5Hz to 200Hz 5-slot disc 12.5 Hz to 500Hz Chopping Frequency: 10-slot disc 25 Hz to 1kHz 30-slot disc 75 Hz to 3KHz 2-slot disc: 0.6° pk-pk over entire frequency range. Phase Jitter: 5, 10 & 30-slot disc: 1° pk-pk over entire frequency range. Frequency Selection: By multi-turn potentiometer 800mV positive going wave from 200W. Sensed by IR LED/Photodiode Reference Output: mounted on chopping head. LCD frequency display on free-standing controller Display: turns counting dial on modular unit The chopping frequency can be externally controlled via a front panel External Control: socket. Maximum input is = 15V into 20kW. Resolution: 1Hz with 10-slot disc. Motor: ± 1% for setting between 15% and 100% of full scale. A variable aperture 2-slot disc is available for non-even mark space mod- Calibration Accuracy: ulation Versus Temperature: Less than 0.01% change per K. Frequency Stability: Versus Line Voltage: Less than 0.01% change results from a change in line voltage from 190V to 265(95V to 130V) Detection Electronics
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