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            <title>Optical Chopper offers frequency stability better than +/-0.1%.</title>
            <link>http://news.thomasnet.com/fullstory/12458</link>
            <description>
Variable frequency Optical Chopper utilizes Dual Phase Lock-In Amplifier to allow greater offset before saturation of gains settings. Blades are 102 mm diameter, chemically blacked, photo-etched discs that allow for operation frequency range of 5 Hz to 20 kHz. They come in 2, 5, 10, 30, and 200 slots. LED display provides direct read-out of chopping frequency, which is set by adjusting 10-turn dial or by applying and external, BNC control input.
&lt;br&gt;&lt;br&gt;&lt;b&gt;This story is related to the following:&lt;/b&gt;&lt;br&gt;&lt;a href='http://news.thomasnet.com/news/optics-photonics' target='_blank''&gt;Optics and Photonics&lt;/a&gt;&lt;br&gt;&lt;br&gt;Search for suppliers of: &lt;a href='http://www.thomasnet.com/products/optical-choppers-14031900-1.html' target='_blank''&gt;Optical Choppers&lt;/a&gt;&lt;br&gt;</description>
            <author>info@productnews.com (ThomasNet News)</author>
            <pubDate>Fri, 26 Jul 2002 07:39:02 -0500</pubDate>
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