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Model651-1DualApertureLightChopperThemodel651-1usesthestandardhead

詳細(xì)介紹

Model 651-1
Dual Aperture Light Chopper
The model 651-1 uses the standard head. This is a dual port design allowing two optical beams to be modulated simultaneously at different frequencies, f1 and f2. Two reference (sync) outputs are made available at the control unit, corresponding to f1 and f2, for use with signal recovery processing electronics, such as a lock-in amplifier.

Two small blanking plates are provided with the standard head and one of these allows either the top port or the bottom port to be blanked off to reduce the effect of any stray light passing through an unused path. The second plate provides some measure of beam restriction when using large diameter beams on the higher frequency (ａnd therefore smaller aperture) port. The standard head is supplied complete with a flat base plate to allow the unit to be used in a free standing mode on a bench type surface. A special feature of this support allows the head to be used in the horizontal plane for modulating vertical beams. The base plate can be removed and standard optical mounting supports employed instead if preferred.

Model 651-1 Mechanical Dimensions

Model 651-1 Blade Dimensions

Model 651-1 Specifications

Operation
	Frequency	10 Hz to 3200 Hz
	outer sector	100 Hz to 3200 Hz
	inner sector	10 Hz to 320 Hz
	Control
	manual	Digital push-button
	external	Application of 0.5 V to 10 V sine or squarewave, 50 Hz to 3200 Hz to EXT SYNC BNC connector
	Internal Frequency
	accuracy	±30 ppm at 25 °C
	stability	±50 ppm/ °C (range 10 °C to 30 °C)
	Jitter	(measured pk-pk and presented as a % of a full cycle)
	outer sector
	100 to 200 Hz	blade only: 0.2%; blade + electronics: < 7%
	200 to 400 Hz	blade only: 0.2%; blade + electronics: < 4%
	400 to 2500 Hz	blade only: 0.2%; blade + electronics: < 1.5%
	2500 to 3200 Hz	blade only: 0.2%; blade + electronics: < 2%
	inner sector
	10 to 20 Hz	blade only: 0.2%; blade + electronics: < 0.7%
	20 to 40 Hz	blade only: 0.2%; blade + electronics: < 0.4%
	40 to 250 Hz	blade only: 0.2%; blade + electronics: < 0.2%
	250 to 320 Hz	blade only: 0.2%; blade + electronics: < 0.3%
	Lock indication	green LED when locked - can be extinguished
	Settling Time	<40 s nominal
Outputs
	Sync Out 1	10 V pk-pk squarewave at outer sector chopping frequency, 50 - 3200 Hz
	Sync Out 2	10 V pk-pk squarewave at inner sector chopping frequency, 10 - 320 Hz
	Connectors	BNC
	Impedance	10 kΩ. Note that although the output voltage is 10 V pk-pk, the high output impedance means that the outputs can be directly connected to the Reference Frequency input of any SIGNAL RECOVERY lock-in amplifier without causing problems.
Power Requirements		110 V AC, 50/60 Hz or 220/240 V AC, 50/60 Hz supply. State which voltage is required when ordering
Dimensions
	Controller	6.6" wide x 3.1" high x 9.3" deep (168 mm wide x 79 mm high x 236 mm deep)
	Chopper head, overall, inc. base and feet	4.8" wide x 5.9" high x 2.8" deep (122 mm wide x 150 mm high x 72 mm deep)
Options		Model 653A 2 m (6'6") extension cable