• 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
Modulators and Choppers Locked in a Master/Slave Mode


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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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 Frequency Range 
 5 Hz to 20 kHz 
 Choppers' Amplitude Stability 
 0.01% or better 
 Reference Output 
 Sine and TTL level square wave 
 Phase Adjustment Range 
 ±45° minimum range 
 Phase Stability 
 Phase Relationship 
 Factory set to customer's spec. 
 Operating Temperature Range 
 0 - 60 °C 
 Power Input 
 110V ac or 220V ac, 50-60 Hz, 20W 

The [sub]system consists of two resonant optical choppers (type CH), chopper "A" and chopper "B", in a MASTER/SLAVE mode. The system can be used as a "stand alone" unit, in the laboratory or as a portable instrument, or incorporated into a larger instrument/system. The two modulators are ONE FIXED FREQUENCY each, picked from the range of 5 Hz to 20 kHz. They are small size, light weight, low cost and long life devices. They require low power drive electronics and do not radiate any electromagnetic interference (EMI). The choppers have high amplitude stability and high frequency stability. They are IR, VIS, UV. Reference signal and position output available.

The PLD-2C driver phase locks two choppers. Chopper "B" is phase locked to chopper "A" (the slave is locked to the master). The phase relationship to the master is factory set to customer's requirement (0° to 360°) and is front panel adjustable in a range of ±45 ° minimum. The driver can be a fully integrated driver with front panels controls and internal power supplies or a printed circuit board level driver. The dimensions of the cased driver are: 12" × 10" × 3.8". The PLD-2C-PC driver is a printed circuit board level driver, which requires an external ±15V DC power supply.

 Power switch to turn the drive "ON" 
 To interconnect chopper "A" (master) to the driver 
 Reference sine wave output of chopper "A", BNC connector 
 Reference TTL output of chopper "A", BNC connector 
 To interconnect chopper "B" (slave) to the driver 
 Reference sine wave output of chopper "B", BNC connector 
 To adjust the phase of the chopper "B" in relationship to chopper "A", ±45 ° minimum range of adjustment around the set level 

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