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    Product Name YUEFENG 770 UV-Visible SpectroPhotometer YUEFENG 770S UV-Visible SpectroPhotometer
    Product Price $2224.00 $2558.00
    Details Details
    Model comparison
    type UV Visible UV Visible
    Type of light beam Proportional double beam of light Proportional double beam of light
    light source Tungsten lamp deuterium lamp Tungsten lamp deuterium lamp
    Light spectrum bandwidth 2.x nm 2.x nm
    Detector
    Accessories
    Parameter comparison
    Optical inspection system Proportional double beam of light, 1200/mm Holographic grating Proportional double beam of light, 1200/mm Holographic grating
    Light spectrum Bandwidth 2nm 2nm
    Wavelength Range 190nm~1100nm 190nm~1100nm
    Wavelength Precision ±0.5nm ±0.5nm
    Wavelength Repeatability ≤0.2nm ≤0.2nm
    Photometric Range 0.0%(T)~200.0%(T)；-0.301~4.000(A) 0.0%(T)~200.0%(T)；-0.301~4.000(A)
    Photometric Precision ±0.5%(T) ±0.5%(T)
    Luminosity Repeatability ≤0.2%(T) ≤0.2%(T)
    stray light ≤ 0.15% (T) (at 220 nm, as NaI) (at 360 nm, as NaNO2) ≤ 0.15% (T) (at 220 nm, as NaI) (at 360 nm, as NaNO2)
    Noise level 100%(T):≤0.2%(T) 0%(T):≤0.1%(T) 100%(T):≤0.2%(T) 0%(T):≤0.1%(T)
    printout RS232 printing interface RS232 printing interface
    Illuminant Deuterium lamp, tungsten halogen lamp Deuterium lamp, tungsten halogen lamp
    drift ≤ 0.0009A/0.5h (2h after startup, 250nm, 500nm) ≤ 0.0009A/0.5h (2h after startup, 250nm, 500nm)
    Ambient Temperature 5℃~35℃，≤85% 5℃~35℃，≤85%