基于SPCE061A数字四探针电阻率测试仪的设计

Design of Digital Four-Probe Resistivity Meter Based on SPCE061A

以16位单片机SPCE0 6 1A为控制核心,并采用内带程控放大器和片上数字滤波器的16位Σ-Δ型模数转换器AD770 5 ,设计了一款智能四探针电阻率测试仪的硬件电路。该仪器能够自动选择量程和自动校准,本设计减小了印刷电路板的面积,提高了测试仪器的智能化水平,具有一定的实用开发价值。

We've designed this intelligent four-probe resistivity meter with a 16-bit-MCU SPCE061A--as its controlling core, as well as a Sigma Delta ADC AD7705 with a programmable gain amplifier and a On-chip Digital Filter. It can self-adjust to the right range and self-calibrate, too. With scale-condensed PCB and somewhat improved auto level, it is of a certain practical developing value.