Terahertz C-995-OH - Open Head Optical Chopper with 3/30 Slot Blade (4Hz to 5KHz)

The C-995 Optical Chopper is a microprocessor-based control system that utilizes direct-digital-synthesis to deliver precise optical chopping rates from 4 Hz to 5000 Hz.
The C-995-OH Chopper is designed with a phase-locked-loop control system, allows the chopping rate to also be synchronized to a user-supplied external clock ranging from 4 Hz to 5 KHz. The controller is then used to measure and display the frequency of the external clock.

The C-995-OH optical chopping head is attached to the controller by means of a 10-foot coiled cord. 

There are two apertures on the chopper head and two sections (30 slots and 3 slots) on the blade for the high and low frequency ranges, respectively (models C-995 and C-995-OH have high-frequency and low-frequency ranges while models C-995-3 and C-995-OH-3 have low-frequency ranges). The aperture diameter is 15 mm with a slot width of 4.5 mm for the 30 slot section and 30 mm for 3 slot section. The small 4.75 inch square outline and two-inch maximum depth of the chopper head permits easy integration into compact optical setups. Dual #8-32 mounting holes permit the apertures to be placed at a height as low as 0.75 inches above an optical bench, or with the included 1/2 inch rod and stand, as high as 13 inches above the mounting surface.

The ease of use and convenience of this instrument are matched only by the high performance to price ratio that is typical of products from Terahertz Technologies Inc. The C-995 is backed by a standard two-year warranty and a guarantee of customer satisfaction.