CH-60 Low Frequency Optical Modulator/Shutter/Chopper

CH-60 Low Frequency Optical Modulator/Shutter/Chopper Description:

CH-60 Datasheet CH-60 CAD Drawings DCH-60 Instructions DCH-60-PC Instructions

The Low cost VARIABLE FREQUENCY Shutters/Choppers Models 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 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.

Features and Advantages:

Product Options

CH-60Includes a mounting plate that allows horizontal and vertical mounting.

CH-60-BBoxed with a window for laser light and can be mounted horizontally and vertically.

CH-60-NFIncludes motor assembly with the blade and cable, but without the frame.

CH-60-IRIncludes an integrated IR emitter (black body).

Comparison of specifications between CH-60 (with DCH-60 driver) and CH-61 (with DCH-60 driver)

Using our 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.

The DCH-60 driver is designed especially for model CH-60 and model CH-61 chopper/shutter.

THE DCH-60 DRIVER CONFIGURATION:

The DCH-60 Driver is available in two configurations:

SPECIFICATIONS (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

SETTLING TIME TO EXTERNAL CLOCK: 20 mSec

MONITOR OUTPUT: TTL level output

POWER REQUIREMENTS:

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