三位半数字毫伏表功能的扩展

本文用两个实例阐明了单片3$frac{1}{2}$位A/D转换器大可发掘利用。(1)袖珍热电偶数字温度表,配K型热电偶,范围-50~1300℃,精度0.5级,比200mV表头只增加8个电阻。(2)制成数字显示仪只增加3个电阻,不但能直接显示被测值(而不是百分数)而且还能通用。

Extending Application of 3-1/2 Digital Millivoltmeter

In this paper two practical examples are used to demostrate the greatly possible exploitation of 3-1/2 digit monolithic A/D converter. One example is a pocket thermocuple thermometer matched with a k-type thermocouple, which temperature range arc from -50 to 1300℃, and the precision is 0.5 grade. Compared with 200mV digital millivoltmeter, it only 8 resistors are extended. Three resistors are added for another example if making a digital displaying meter. Not only it can display the measured value directly but also it can be used generally.