【摘要】 介绍了一种实现７２１型分光光度计光强自动调节的简便方法。主要部件是串联连接的一组继电器和电阻，通过微机控制继电器的状态可以使这一电路的阻值发生变化。用这种电路替代原７２１型分光光度计中的光强调节电位器即可实现自动调节光强。该法在各种仪器中有推广应用前景。更多还原

【Abstract】 A simple method for automatical adjustment of light intensity on model 721 spectrophotometer is introduced.It employs several relays and the corresponding resistors,which are in series connection.By microcomputer control of the relays,different resistance can be obtained just like a regulation-resistor.While substituting the regulation-resistor for light intensity adjustment on the spectrophotometer with this device, automatic adjustment of light intensity is realized.The method described in this paper might be widely employed on other instruments.更多还原