The 418 optical chopper is a stand-alone control unit coupled by a 2m-long cable to the chopper head. Four easily interchangeable chopper disks are supplied as standard, providing chopping frequencies from 5 Hz to 3 kHz.
A 2-slot disc with variable aperture and higher-frequency discs are also available. The chopping frequency is indicated by a digital dial, and a square reference output for use with lock-in amplifiers is supplied.
| SPECIFICATIONS | |
| Hash frequency | 2-slot disc 5Hz – 200Hz
5-slot disc: 12.5Hz – 500Hz 10-slot disc: 25Hz – 1kHz 30-slot disc: 75Hz – 3kHz |
| Phase jig | 2-slot disc: 0.6° pk-pk over the entire frequency range
5-, 10- and 30-slot disc: 1° pk-pk over the entire frequency range |
| Frequency selection | By multi-turn potentiometer |
| Reference output | 800mV positive wave from 200W.
Detected by an IR LED/photodiode mounted on the cutting head. |
| Display | LCD frequency display on stand-alone controller turns counter dial on modular unit |
| Resolution | 1Hz with 10-slot disks |
| Motor | High-quality 11-pole DC motor with precious metal commutator |
| Calibration accuracy | ±1% for settings between 15% and 100% of full scale |
| Variable opening | A 2-slot variable aperture disc is available for modulating non-uniform marking space. |
| Frequency stability | As a function of temperature: Less than 0.01% variation per K |
| In relation to mains voltage | Less than 0.01% variation for a change in mains voltage from 190V to 265(95V to 130V) |
Download data sheet
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