• 62-40 FOREST AVE, 2nd FLOOR, RIDGEWOOD, NY 11385 • TEL: (718) 456-6000 • FAX: (718) 456-6050 • www.EOPC.com
P.O. BOX 650441 FRESH MEADOWS, NY 11365
Rotating Wheel Optical Chopper
  • Wide frequency range 4 Hz to 5 kHz
  • Single blade covers the frequency range
  • Precision photo-etched BeCu blade
  • Phase-locked-loop stability
  • External control via DC voltage or TTL/CMOS clock
  • Bright 4 digit LED display
  • Direct reading in Hertz
  • Adjustable aperture height
  • Small size and light weight
  • Low jitter
  • Continuous frequency adjustment
  • Rugged protective housing
  • Iron-less core Swiss made motor


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optical modulators / choppers / shutters
tuning fork (fixed frequency) choppers
variable frequency choppers
choppers / shutters
rotating wheel (variable frequency) choppers

optical chopping / modulating systems
optical chopping systems locked to ext. clock
optical chopping systems locked in master/slave mode

optical SAFETY shutters
laser safety (interlock) shutters
X-Ray (interlock) shutters

optical shutters, choppers and filters
optical shutters / choppers
optical choppers / shutters
filter selectors

optical scanners and deflectors
resonant (fixed frequency) scanners
beam deflectors

optical scanning / deflecting systems
- optical scanners locked to an external clock signal
- optical scanning systems to generate
a circle or an ellipse or to lock optical scanners
in phase or out of phase

- optical scanning systems to generate
a Raster Scan or Lissajous Patterns

- X,Y raster scanning systems
- 2-axis deflectors

ED Driver
AGC Driver
PLD-1C Driver
PLD-1S Driver
PLD-2C Driver
PLD-2S Driver
PLD-2SXY Driver
PLD-XYG Driver
DCH-40 Driver
DCH-50 Driver
DCH-60 Driver
DSH-10 Driver
DSH-20 Driver
DSH-35 Driver
DSH-65 Driver

other products
Filter selectors
Rotating Wheel Optical Choppers
photo diode amplifiers
o/e and e/o converters
fiber optic multiplexers
fiber optic video links
laser vibrometers
Photodiode Transimpedance Amplifier
Analog / digital fiber links
Optical time domain reflectometers
Optical spectrum detectors
Tuneable laser sources
Variable optical attenuators
Loss test sets
Fiber optic power meters
Light sources
Visual fault locators
Video probes
Fiber identifiers

Data Sheets

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The C-995 Optical Chopper is a general purpose optical chopper designed for laboratory use. Equipped with a large five-digit LED readout, the C-995 controller enables digital entry of the desired chopping rate directly from the front panel. Additionally the C-995 is equipped with a bi-directional Rs-232 port that equips the user to set the desired chopping rate to a resolution of .001 Hz and to read the status of the instrument.
As the unit is designed with a phase-locked-loop control system, the chopping rate may also be synchronized to a user-supplied external clock ranging from 4 Hz to 5 KHz. The controller is then used to read the frequency of the external clock. The C-995 chopping head is attached to the controller by means of a 10 foot coiled cord. The precision etched blade is fully enclosed for protection from inadvertent damage. There are two apertures and two blade sections (30 slots and 3 slots) for the high and low frequency ranges respectively. The aperture diameter is 15 mm with a slot width of 4.5 mm (30 slot section) or 15 mm (3 slot section). The small 4.75 inch square outline and 2.5 inch maximum depth permits easy integration into compact optical setups. Dual #8-32 mounting holes permit the apertures to be placed at a height as low as 0.75 inches above an optical bench, or with the included 1⁄2 inch rod and stand, as high as 13 inches above the mounting surface

The chopper is backed by a standard two year limited warranty.