LOW FREQUENCY OPTICAL MODULATOR/SHUTTER
CH-50
VARIABLE FREQUENCY CHOPPER
FEATURES AND ADVANTAGES:
*Frequency from DC to 12 Hz
*LOW COST
*Aperture 0.25" X 0.45" (6.3mm X 11.4mm)
*Jitter free operation
*High frequency stability (to 0.005%)
*Small size
*Withstands shock and vibration
*High reliability, long life
*Accepts external clock input
*Phase locking to an external input
*Can be stopped in the "ON" or "OFF" position
*No radiated electromagnetic interference (EMI)
*Bright or dark blade
*A BOXED chopper optional
*Integrated IR EMITTER (BLACK BODY) optional
*Special pricing for OEM applications.
DESCRIPTION:
The VARIABLE LOW FREQUENCY modulator Model CH-50 consists 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 will set the chopper to the open position and current in the other direction will set the chopper to the closed position. Alternating the current will cause the blade to open and close the chopper at a frequency range from DC to 12Hz. 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 model CH-50-IR offers an integrated IR emitter (black body).
When used with our DCH-50 Drive Electronics and an external clock input, a frequency stability of 0.005% is possible. This ultra high stability cannot be achieved with a rotating chopper. The chopping operation is locked in phase to the clock input therefore no additional circuitry is needed for phase locking. The driver also enables the user to set the chopper, when it is not running, in either a closed position or an open position.
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)APERTURE SIZE
0.25" × 0.45" (6.3mm × 11.4mm) FREQUENCY RANGE
DC to 12Hz
RESPONSE TIME
(from an OPEN position to a CLOSED position, or vice-versa)
30 mSec FREQUENCY STABILITY
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
SETTLING TIME TO EXTERNAL CLOCK
60 mSec MONITOR OUTPUT
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 POWER REQUIREMENTS
(with IR EMITTER option)CH-50 with an IR EMITTER option and driver board:
5V dc, 1.2 Amp SHUTTER SIZE
1.3" W × 2.5" H × 0.85" D
SHUTTER WEIGHT
1.5 Oz (42 grams) OPERATING TEMPERATURE
0 - 65°C
商品属性 [频率] DC to 12 Hz