Extending Application of 3-1/2 Digital Millivoltmeter
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摘要: 本文用兩個實例闡明了單片3$\frac{1}{2}$位A/D轉換器大可發掘利用。(1)袖珍熱電偶數字溫度表,配K型熱電偶,范圍-50~1300℃,精度0.5級,比200mV表頭只增加8個電阻。(2)制成數字顯示儀只增加3個電阻,不但能直接顯示被測值(而不是百分數)而且還能通用。
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關鍵詞:
- 3$\frac{1}{2}$位單片 /
- A/D轉換器 /
- 袖珍熱電偶數字溫度表
Abstract: 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.-
Key words:
- 3-1/2 digit single chip /
- A'D converter /
- pocket thermocouple thermometer
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