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721分光光度计是实验室常规仪器,其光学部份和电子部份的设计是比较令人满意的。但是老式的指针式电表精度不高,读数不方便。我们利用现在常见的3(1/2)位数字万用表(或数字电压表)做显示器,并配以对数转换电路实现了吸光值数字直读。其精度提高一倍,分辨率由原来0.01A(平均值)提高到0.001A;有效范围由1A扩大到2A,方法简单易行,一表两用,节省费用,提高效率。同时还可以与计算机或记录仪连接,扩大了应用范围。
721 spectrophotometer is a routine laboratory equipment, the optical part and the electronic part of the design is more satisfactory. However, the accuracy of the old pointer meter is not high and the reading is inconvenient. We use the now common 3 (1/2) digital multimeter (or digital voltmeter) to do the display, and with a logarithmic conversion circuit to achieve the digital absorption of direct reading. The accuracy is doubled. The resolution is increased from 0.01A (average value) to 0.001A. The effective range is expanded from 1A to 2A. The method is simple and easy, with one table and two functions, saving costs and improving efficiency. At the same time can also be connected with a computer or recorder, expanding the scope of application.