Eliminate thermoelectric EMF in low-ohm measurements

被引：0
|
作者：
Wynne, J [1 ]
机构：
[1] Analog Devices Inc, Limerick, Ireland
来源：
EDN | 2002年 / 47卷 / 13期
关键词：
Electric excitation - Electric impedance - Electric variables measurement - Error detection - Problem solving - Thermoelectricity - Transistors - Voltage control;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Elimination of thermoelectric electromagnetic fields (EMF) that causes errors in the readings while trying to measure small voltages or low impedance are discussed. A standard way to solve this problem is subsequently averaging the two readings by reversing the excitations. An increase in excitation current increases the measurement sensitivity , the two internal 200-μA excitation currents appear in parallel with each other. Port pins P1 and P2 of the AD7719 drive the transistors in antiphase mode.
引用
收藏
页码：98 / +
页数：2
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