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   SERIES SL40 Duo two-channel spectrometer S150 Duo two-channel spectrometer Photo of the device Optical scheme     Technical characterisitcs SL40 Duo-1024USB SL40 Duo-3648USB S150 Duo-1024USB S150 Duo-3648USB Optical scheme Optical scheme:  original mirror-lens two-channel original mirror-lens two-channel vertical–symmetrical two-channel vertical–symmetrical two-channel F/number: 1/4.9 1/4.9 1/9.3 1/9.3 Focal length: 40 mm 40 mm 158 mm 158 mm Size of diffraction gratings: 12 x 10 x 3 mm 12 x 10 x 3 mm 15 x 15 x 3 mm 15 x 15 x 3 mm Mirror: aspherical aspherical spherical spherical Optics     Diffraction grating: 1200 l/mm 1200 l/mm 1200 l/mm 1200 l/mm Reciprocal linear dispersion: 17.7 nm/mm 17.7 nm/mm  5 nm/mm 5 nm/mm Spectral resolution: < 0.8 nm < 0.5 нм < 0.2 нм < 0.15 nm Wavelength registration: 205 nm 230 nm 120 nm 135 nm Echelle grating installation no no yes yes Detection system         Photodetector: S8378 - 1024Q TCD 1304DG S8378 - 1024Q TCD 1304DG Number of pixels: 1024 3648 1024 3648 Width of pixel: 25 µm 8 µm 25 µm 8 µm Height of pixel: 500 µm 200 µm 500 µm 200 µm Spectral response:  200 – 1065 nm 200 – 1100 nm 200 – 1065 nm 200 – 1100 nm Min. exposure time:  2.1 ms 7.4 ms 2.1 ms 7.4 ms Max. exposure time (20°С): 5 s 3 s 5 s 3 s Min. interval between scans: 1 ms 1 ms 1 ms 1 ms Dynamic range for one scan: 3600:1 1100:1 3600:1 1100:1 Analogue–to–digital converter (ADC): 14 bit, 16384 counts 12 bit, 4096 counts 14 bit, 16384 counts 12 bit, 4096 counts Synchronization: internal, external internal, external internal, external internal, external Interface: USB USB USB USB Radiation input: via optical fiber Overall sizes (L х W х H): 117 x 80 x 40 mm 117 x 80 x 40 mm 200 x 143 x 72 mm 200 x 143 x 72 mm Weight: 0.47 kg 0.47 kg 2.5 kg 2.5 kg