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Low cost L-C-R Meter

License: Apache License 2.0

C 69.38% C# 2.45% Python 3.29% C++ 17.60% Dockerfile 0.18% Assembly 7.10%

zlcr's Introduction

概述

基于简单硬件和 DLIA 算法实现 LCR 表，主要特点是：

电路结构简单，超低成本；
激励信号幅度：0.25 Vrms；
激励信号频率：[1e0, 1e5] Hz，步进：0.01 Hz;
待测阻抗范围：[1e-3, 1e7] Ohm；

核心类似 SDR 中的数字下变频（数字正交解调）算法，准确的定义是 DLIA（Digital Lock-in amplifier，数字锁定放大器）；使用数字信号处理算法代替部分硬件电路，降低硬件复杂程度。

与主流方案的区别：

PSD 电路，测量范围更大，当信号转换到数字域后，就无需再考虑噪声和失调；
FFT、LMS算法，分辨率更高，调整滤波器带宽，可以获得更好信噪比；

测试截图：

硬件相关

板载调试器为 J-Link OB-STM32F072-CortexM / CMSIS-DAP 兼容设计，DFU 自举；

软件相关

扩展部分

运放构成的自平衡电桥不适合工作在 100 kHz 以上频率，设计了数字平衡电桥结构，由两个 DDS 产生激励，检测不平衡电压/电流，控制激励信号幅度/相位，使桥路趋近平衡（减小误差）；同时采样 V(DUT) & I(DUT)，计算复阻抗；通过欠采样解决 ADC 采样率不够和计算量增大的问题，解决方案是欠采样（中频采样），设计了简单的采样保持器 (暂未验证)；设计通过 PWM（AF OD 模式）调整 I(FSADJSET) AD9834 输出幅度，通过抖动实现 16 bit 相位控制；

最后，发个还未验证的版本：ZLCR Plus Schematic

参考

zlcr's People

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xd785 shtjdee edacat zhangjinxing trigrass2 cgrrtyxicp gzhuli chrisjn52 zzwuyu ng-designs soybeanmeal chinaboy20 witsoft001 bluecodecat ningmen7294 cgrrty thinklake zhu163bing wujfeng yoohoo1000 854619267 suli3 1847123212 huangqi412 hsuedq konosubakonoakua poetli hotdll hermeszhang felix-zju cutelolly yaojinghui powerpan1990 e0r hello2002k lefanter allen0871 babyge zmmfly dingman-git lanxianhui ricetea gavinjing ahfong2006 nisianot jiangtongcheng manmuqingshan chengjia535 littlebadbay sokjok1032 lin20121221 bobde163

zlcr's Issues

文件上传不完整，打不开？

这个单片机程序怎么编译啊

照着做了一版，数据是乱的，请问哪里大概哪里不对

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