ENOB=（SINAD-1.76dB）/6.2，其中1.76为理想ADC的量化噪声，6.2为将log2转化为log1的系数比。很明显，SINAD越大，ENOB越大，而提升SINAD的方法就是重点关注与测试精度有关的电路。在数字示波器的架构中，与测试精度有关的电路有：前端采集电路、ADC采样电路。被测信号经前端采集电路进行调理后传输给ADC进行采样。其中前端采集电路及ADC采样电路对ENOB有较大影响，实际工作时，偏置误差，非线性误差，增益误差，随机噪声，甚至还有ADC交织引起的噪声都会增大ENOB。ENOB说明了什么ENOB是衡量ADC性能的标尺，若示波器ENOB指标好，那么偏置误差、增益误差、非线性度等都较小，同时带宽噪声也较低。如果主要被测信号是正弦波信号，那么ENOB就需要重点关注。通常示波器都由前端电路衰减器、放大器等信号调理电路、ADC采样电路组成，在设计的时候，会在前端采用各种射频技术，各种频率响应方式，实现的频响平坦度，以便ADC采样时失真，增大ENOB指标。如何判断ENOB的大小3.11.底噪示波器在不同垂直档位及偏置下的底噪大小是评估示波器测量质量的一个重要依据，通过观测底噪大小，可以判断前端采集电路和ADC采样电路设计的优劣，因为示波器的底噪会增加额外的抖动并较小设计裕量，对测试结果造成较大的影响。
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什么是转矩波动？它对电机运行有什么影响？如果有，影响有多大？它对我们生产生活有什么意义？我们又该如何测试转矩波动呢？接下来就让我们具体了解一下转矩波动。什么是转矩波动转矩波动是各种工作机械传动轴的时候出现扭矩的波动，与动力机械的工作能力、能源消耗、效率、运转寿命及安全性能等因素紧密联系，转矩的测量对传动轴载荷的确定与控制、传动系统工作零件的强度设计以及原动机容量的选择等都具有重要的意义。通俗地讲就是电机由于机械结构和本身转子惯量输出一定转矩的上下波动。
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CAN总线不一致的危害复杂的CAN网络，各个节点质量良莠不齐会对CAN总线网络存在较大的安全隐患，通常会因为其中某一个节点的错误进而影响整体总线正常运行，乃至导致整体总线的瘫痪。总线瘫痪比如一个CAN网络包含节点C，节点A差分电压是1.2V，而节点B的差分电压是2.0V，节点C差分电压是1.8V。当整车CAN网络工作在强电磁干扰的环境下，环境的共模干扰串扰到CAN总线中会使节点A的差分电压影响到0.9V以下，导致节点从显性电平翻转成为隐性电平，进而导致了节点A工作故障，频繁发出错误帧。
