EOPC - Optical Shutter and Chopper


	• 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

DESCRIPTION

CAD DRAWINGS

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

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.

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