| 摘要 |
PURPOSE:To enable to perform a self-adjustment of sensitivity simply through simple operation of a switch. CONSTITUTION:A light source HCL is lighted to match a wavelength of a spectrometer and adjust a slit width. At the beginning, a switch SW1 is brought to ON, and thereby at a stage when matching of the wavelength of the spectrometer MC and adjusting of the slit width are completed, a photo detector PM has a diode applying voltage which is adjusted so that a photometry output Vi becomes equal to a reference voltage Vr, and an input voltage of a DC-DC converter is stored in a capacitor of a sample hold circuit SH. Thus, even if the switch SW1 is opened since that, the sensitivity of the PM is maintained to a sensitivity produced right before the SW1 is opened, and under said condition, Vi is equal to Vr. The Vr is set so that an output of an absorbance converter LOG attains O in the case of Vi=Vr, and as a result, a required adjustment is automatically completed through the above operation. |
