• 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
Low Frequency Optical Modulators/Shutters/Choppers
CH-50  CH-60  CH-61
FEATURES AND ADVANTAGES
  • Chopping frequency from DC to 50 Hz (when used as a chopper)
  • Response time of 10msec (when used as a shutter)
  • No hard stop, no click sound
  • No shock to the system when opening and closing
  • LOW COST
  • Aperture 0.25" × 0.45" (6.3mm × 11.4mm) or 0.34" (8.7 mm) dia.
  • Jitter free operation
  • High frequency stability
  • Small size
  • Withstands shock and vibration
  • High reliability, long life
  • Accepts external clock input (with DCH-60 driver)
  • Phase locking to an external input (with DCH-60 driver)
  • Can be stopped in the "ON" or "OFF" position
  • No radiated electromagnetic interference (EMI)
  • Bright or dark blade
  • Low power drive electronics
  • No radiated electromagnetic interference (EMI)
  • Bright or dark blade
  • A boxed chopper optional
  • Integrated IR emitter (BLACK BODY) optional
  • Special pricing for OEM applications
  • Patented technology




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The Low cost VARIABLE FREQUENCY Shutters/Choppers Models CH-50, CH-60 and CH-61 consist of a blade (vane) mounted on a motor with a limited rotation angle. The position of the blade follows the direction of the current in the motor winding. Current in one direction sets the shutter to the open position and current in the other direction sets the shutter to the close position. Alternating the current cause the blade to open and close the chopper at a frequency range from DC to 12 Hz for the CH-50, or from DC to 50 Hz for the CH-60 and CH-61. This method of chopping is jitter free. High reliability and long life is achieved by eliminating the use of a brush type motor or gear heads. The device can be used at the same time as a shutter that is controlled by the direction of the current.

The shutter / chopper is especially suitable for low cost dedicated applications, OEM, built into an instrument/system, and for portable systems.

Configurations:
Models CH-50, CH-60 and CH-61 come with a mounting plate that allows horizontal and vertical mounting.
Models CH-50-B, CH-60-B and CH-61-B are boxed with a window for laser light and can be mounted horizontally and vertically.
Models CH-50-NF, CH-60-NF and CH-61-NF indicate the motor assembly with the blade and cable but without the frame.
Models CH-50-IR, CH-60-IR offer an integrated IR emitter (black body).


BOXED SHUTTER / CHOPPER:

CH-60-B

OUTLINE DRAWING of the CH-60 CHOPPER / SHUTTER with IR emitter:

CH-60-IR

Using our DCH-50 or DCH-60 driver with the "MODE" selector switch provides two modes of operation for the CH-60 chopper/shutter: internal mode and external mode. In the internal mode the CH-60 is used as a variable low frequency chopper. The chopping frequency is set by an internal oscillator adjustable from 1 Hz to 50 Hz. In the external mode the CH-60 is used as a chopper or as a shutter and is controlled by an external TTL signal input. "high" input keeps the CH-60 open , "low" input keeps it close. Response time is 10msec. Maximum frequency for TTL input is 50Hz. The chopper is especially suitable for low cost dedicated applications, OEM, built into an instrument/system, and for portable systems.

 SPECIFICATION 
 CH-50 
 (when used with the DCH-50 Driver
 CH-60 
 (when used with the DCH-60 Driver
 CH-61 
 (when used with the DCH-60 Driver
 APERTURE SIZE 
 0.25" × 0.45" (6.3mm × 11.4mm) 
 0.25" × 0.45" (6.3mm × 11.4mm) 
 0.31" dia. (8.7mm dia.) 
 FREQUENCY RANGE 
 DC to 12Hz 
 DC to 50Hz 
 DC to 50Hz 
 RESPONSE TIME 
 (from an OPEN position to a CLOSED position, or vice-versa) 
 30 mSec 
 10 mSec 
 10 mSec 
 FREQUENCY STABILITY 
 0.1% internal clock, 0.005% with external crystal clock input 
 0.1% internal clock, 0.005% with external crystal clock input 
 0.1% internal clock, 0.005% with external crystal clock input 
 EXTERNAL CLOCK INPUT
 (5V or "OPEN" to open the shutter, 0V or "GND" to close the shutter) 
 DC to 12Hz TTL level input 
 DC to 50Hz TTL level input 
 DC to 50Hz TTL level input 
 SETTLING TIME TO EXTERNAL CLOCK 
 60 mSec 
 20 mSec 
 20 mSec 
 MONITOR OUTPUT 
 TTL level output ("Hi" indicates the shutter is open, "Lo" indicates the shutter is closed) 
 TTL level output ("Hi" indicates the shutter is open, "Lo" indicates the shutter is closed) 
 TTL level output ("Hi" indicates the shutter is open, "Lo" indicates the shutter is closed) 
 POWER REQUIREMENTS 
 (Standard) 
 CH-50 and driver board: 5V dc, 0.30 Amp 
 CH-60 and driver board: 15V dc, 250 mA 
 CH-61 and driver board: 15V dc, 250 mA 
 POWER REQUIREMENTS 
 (with IR EMITTER option) 
 CH-50 with an IR EMITTER option and driver board: 5V dc, 1.2 Amp 
 CH-60-IR (an IR EMITTER option) and driver board: 15V dc, 250 mA & 5V dc, 1.0 Amp 
 CH-61 does not offer an IR EMITTER option  
 SHUTTER SIZE 
 1.3" W × 2.5" H × 0.85" D 
 1.75" W × 3.0" H × 1.0"
(1.90"W × 3.0" H × 1.25"D boxed) 
 1.75" W × 3.0" H × 1.0"D
(1.90"W × 3.0" H × 1.25"D boxed) 
 SHUTTER WEIGHT 
 1.5 Oz (42 grams) 
 2.5 Oz (70 grams) 
 2.5 Oz (70 grams) 
 OPERATING TEMPERATURE 
 0 - 65°C 
 0 - 65°C 
 0 - 65°C 



The DCH-50 driver is designed pecially for model CH-50 chopper/shutter
THE DCH-50 DRIVER CONFIGURATION:
The DCH-50 Driver is available in two configurations:
Model DCH-50-PC: A board level driver
Model DCH-50-110 or -220: A cased driver, 5.3" x 5.3" x 2"
Operating from a line voltage of 110V ac or from 220V ac

The DCH-60 driver is designed pecially for model CH-60 and model CH-61 chopper/shutter
THE DCH-60 DRIVER CONFIGURATION:
The DCH-60 Driver is available in two configurations:
Model DCH-60-PC: A board level driver
Model DCH-60-110 or -220: A cased driver, 5.3" x 5.3" x 2"
Operating from a line voltage of 110V ac or from 220V ac

DCH DRIVER

SPECIFICATIONS FOR THE CH-60 (when used with the DCH-60 Driver):
APERTURE SIZE: 0.25 X 0.45 inch
FREQUENCY RANGE: DC to 50Hz
RESPONSE TIME: 10 mSec, from an OPEN position to a CLOSED position, or vice-versa
FREQUENCY STABILITY:0.1% internal clock
0.005% with external crystal clock input
EXTERNAL CLOCK INPUT: DC to 50Hz TTL level input
5V or "OPEN" to open the chopper/shutter
0V or "GND" to close the chopper/shutter
SETTLING TIME TO EXTERNAL CLOCK: 20 mSec
MONITOR OUTPUT: TTL level output
"Hi" indicates the chopper is open
"Lo" indicates the chopper is closed
POWER REQUIREMENTS:
1. The CH-60 and driver board: 15V dc, 250 mA
2. CH-60-IR (emitter option) and driver board:
15V dc, 250mA and 5V dc, 1.0 Amp
CHOPPER SIZE:
1.75" W X 3.0" H X 1.0" D
(1.90" W x 3.00" L x 1.25" D boxed)
CHOPPER WEIGHT: 2.5 Oz (70 grams)
OPERATING TEMPERATURE: 0-65 deg C

THE DCH-60 DRIVER CONFIGURATION:
The DCH-60 Driver is available in two configurations:
Model DCH-60-PC: A board level driver
Model DCH-60-110 or -220: A cased driver, 5.3" x 5.3" x 2"
Operating from a line voltage of 110V ac or from 220V ac

See CAD DRAWINGS (above) for additional information.

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