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	Model 197 Precision Light Choppers Self contained chopper head Quartz crystal frequency accuracy and stability Internal or external frequency reference Sync outputs Fully enclosed housings for safety and low noise Optical absorption, reflection and transmission measurements Dual-beam ratiometric measurements Automatic background subtraction in boxcar averager experiments The model 197 is a compact, high performance chopper, offering features and benefits that are ideal for use in modern photometic systems.
	Model 198A Mixed Beam Light Chopper Self contained chopper head Dual aperture with three SYNC outputs Quartz crystal frequency accuracy and stability Internal or external frequency reference Fully enclosed housings for safety and low noise Pump-probel experiments Nonlinear optics The model 198A is a dual frequency light chopper, using a thin rotating metal blade with an inner set of 11 apertures and an outer set of 18 apertures to simultaneously chop two light beams.
	650 Series Light Choppers Remote chopper heads Quartz crystal frequency accuracy and stability Internal or external frequency reference Sync outputs Choice of 3 models Fully enclosed housings for safety and low noise Optical absorption, reflection and transmission measurements Dual-beam ratiometric measurements Automatic background subtraction in boxcar averager experiments The 650 series of light choppers features a control box with separate chopping heads for remote operation.

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