“我想用一块Arduino电路板做一台LED的分光光度计，”考埃尔说，“有人曾经做过，但我想做得更好些。”

"I want to build an LED spectrophotometer with an Arduino," Cowell says. "People have done it before, but I want to make it better."

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详细地描述了它的主要部份——驱动装置，测角装置、红外光度计的工作原理和电路特点。

Its major parts-the operating principle and circuit feature of drivers, the equipment for measurement of telescope position and infrared photometer are introduced.

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介绍了721型分光光度计，灯电源电路和稳压电路故障现象，分析了故障产生的原因，提供了排除故障办法，对该仪器维修提供了借鉴的经验。

This paper introduced some common faults of 721 spectrophotometer, found out the cause of formation, and presented fixing method, it may be used for instrument maintenance for reference.

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