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  US2000 Micro Spectroradiometer has used grating with high-precision, CCD array sensor with 2048 pixels and crossing compact optical structure with 60mm focus length. Due to these things, the instrument is small and the optical resolution is 0.35mm. 16-bits AD programmable modules are used to design the circuit, synchronous clock driver curbs CCD reset noise effectively, programmable controlled bias voltage acquires large dynamic testing range, and then data transmitted from high-speed USB2.0 interface to PCs.