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本文介绍了一种应用单板计算机研制的数字电压表,它用单板计算机的CTC计数电路做定时计数器,用PIO接口电路控制A/D转换电路。由于充分利用了单板计算机的软件和硬件,配用的外部电路十分简单。本文还介绍了本电压表主要误差项的处理方法。
In this paper, a digital voltmeter developed by the single board computer is introduced. It uses the CTC counting circuit of the single board computer as a timing counter and controls the A / D conversion circuit by the PIO interface circuit. Due to the full use of single board computer software and hardware, equipped with an external circuit is very simple. This article also introduced the main error of the voltage meter processing methods.