本文介绍用电路构造智能式精密数字电阻仪的原理及技术途径。
This paper presents the principle and design method of a precision digital resistor constructed by a circuit.
PGA309作为数字化可编程信号调理芯片，主要用于电阻桥式压力传感器，将微弱的传感器桥路信号进行放大输出。
As a digital programmable chip of signal conditioning chip, PGA309 is mainly used in resistance bridge pressure sensors, it amplifies and outputs the weak signal from the sensor.
数字式电压表在测量低于20欧姆的电阻时﹐会因为引脚的电阻而使测量不准确。除非它是一个四线欧姆表。
DVM is not accurate in measuring resistance below 20 ohm due to the lead resistance, unless it is a 4 wired ohm meter.
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