引用: uiuisky 发表于 2019-4-29 16:32
谢谢你的回复这是一个坏消息。
如果我以200mV / div运行示波器并且所需信号大约为10mV（事实上，当我想测量背景信号时它可以更低，以及它可以升高到1000mV），那么量化误差是巨大的。
1位表示6.25mV ...（200mV * 8/2 ^ 8Bit）平均> = 256次，12位垂直分辨率仍然有一个令人不快的错误。
>如果我以200mV / div运行示波器并且所需信号大约为10mV（事实上，当我想测量背景信号时它可以更低，以及它可以升高到1000mV），那么量化误差是巨大的。
1位表示6.25mV ...（200mV * 8/2 ^ 8Bit）>平均> = 256次，12位垂直分辨率仍然有一个令人不快的错误。
1位代表0.39mV。
因此，如果我想以4位或更多位开始测量，则信号必须大于1.56mV。
几乎是真的，但不可避免...... 4个量化等级是2比特，我相信...>已经有一个放大器（G = 1000），前面有带通行为。
但是，如果有人通过测量麦克风走路或将笔放在桌子上，则会产生很高的噪音：P。
然后我得到短峰值电平，我的所需信号仍然覆盖。
如果它剪辑，它不是一件好事。
但实际上，在使用平均模式时，我的显示器仍然有一个良好的信号。
存在大噪声时捕获小信号的标准问题。
通常，您应该尽一切努力通过在安静的环境中工作或通过过滤来降低噪音。
如果这些都不适合您，那么平均可能会有所帮助，如果您有重复的波形。
只要噪声与信号具有相同的平均DC偏移，平均值就会产生良好的结果，但正如我所说，你会冒着对示波器前端施加压力的风险，这将导致过早失效。
我总是尽一切努力小心对待我的乐器。
人
以上来自于谷歌翻译
以下为原文
> If i run the oscilloscope in 200mV/div and the desired signal is about 10mV (well in fact it can be lower when i want to measure the backgroundsignal, aswell as it can rise up to 1000mV), then the quantization error is huge. 1 Bit represents 6.25mV... (200mV*8/2^8Bit)
> Averaging >= 256 times and 12 Bit vertical resolution still has an unpleasant error. 1 Bit represents 0.39mV. So if i want to start measuring with 4 or more bits, the signal has to be greater than 1.56mV.
Almost true, but unavoidable... 4 quantization levels is 2 bits, I believe...
> There is already an amplifier (G=1000), with bandpass behavior, preceding. But the high noise levels are occuring if someone is walking by the measuring-microphone or dropping his pen on the table :P. Then i get short peak-levels where my desired signal is still overlaid. If it clips, its not a good thing. But in practice i still have a good signal on my display when using averaging mode.
A standard problem of capturing small signals in the presence of big noise. Generally you should make every attempt to reduce the noise, either by working in a quiet environment, or by filtering. If neither of those works for you, then averaging might be helpful, IF you have a repetitive waveform.
As long as the noise has the same Average DC offset as the signal, averaging should produce good results, but, as I said, you run the risk of stressing the front end of the scope, which will lead to premature failure. I always make every attempt to treat my instruments carefully.
Al
引用: uiuisky 发表于 2019-4-29 16:32
谢谢你的回复这是一个坏消息。
如果我以200mV / div运行示波器并且所需信号大约为10mV（事实上，当我想测量背景信号时它可以更低，以及它可以升高到1000mV），那么量化误差是巨大的。
1位表示6.25mV ...（200mV * 8/2 ^ 8Bit）平均> = 256次，12位垂直分辨率仍然有一个令人不快的错误。
>如果我以200mV / div运行示波器并且所需信号大约为10mV（事实上，当我想测量背景信号时它可以更低，以及它可以升高到1000mV），那么量化误差是巨大的。
1位表示6.25mV ...（200mV * 8/2 ^ 8Bit）>平均> = 256次，12位垂直分辨率仍然有一个令人不快的错误。
1位代表0.39mV。
因此，如果我想以4位或更多位开始测量，则信号必须大于1.56mV。
几乎是真的，但不可避免...... 4个量化等级是2比特，我相信...>已经有一个放大器（G = 1000），前面有带通行为。
但是，如果有人通过测量麦克风走路或将笔放在桌子上，则会产生很高的噪音：P。
然后我得到短峰值电平，我的所需信号仍然覆盖。
如果它剪辑，它不是一件好事。
但实际上，在使用平均模式时，我的显示器仍然有一个良好的信号。
存在大噪声时捕获小信号的标准问题。
通常，您应该尽一切努力通过在安静的环境中工作或通过过滤来降低噪音。
如果这些都不适合您，那么平均可能会有所帮助，如果您有重复的波形。
只要噪声与信号具有相同的平均DC偏移，平均值就会产生良好的结果，但正如我所说，你会冒着对示波器前端施加压力的风险，这将导致过早失效。
我总是尽一切努力小心对待我的乐器。
人
以上来自于谷歌翻译
以下为原文
> If i run the oscilloscope in 200mV/div and the desired signal is about 10mV (well in fact it can be lower when i want to measure the backgroundsignal, aswell as it can rise up to 1000mV), then the quantization error is huge. 1 Bit represents 6.25mV... (200mV*8/2^8Bit)
> Averaging >= 256 times and 12 Bit vertical resolution still has an unpleasant error. 1 Bit represents 0.39mV. So if i want to start measuring with 4 or more bits, the signal has to be greater than 1.56mV.
Almost true, but unavoidable... 4 quantization levels is 2 bits, I believe...
> There is already an amplifier (G=1000), with bandpass behavior, preceding. But the high noise levels are occuring if someone is walking by the measuring-microphone or dropping his pen on the table :P. Then i get short peak-levels where my desired signal is still overlaid. If it clips, its not a good thing. But in practice i still have a good signal on my display when using averaging mode.
A standard problem of capturing small signals in the presence of big noise. Generally you should make every attempt to reduce the noise, either by working in a quiet environment, or by filtering. If neither of those works for you, then averaging might be helpful, IF you have a repetitive waveform.
As long as the noise has the same Average DC offset as the signal, averaging should produce good results, but, as I said, you run the risk of stressing the front end of the scope, which will lead to premature failure. I always make every attempt to treat my instruments carefully.
Al
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