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高分辨率模式是示波器最重要的特性;
我在Agilent和Tek示波器上使用了多年。 我使用电机工作,它让我有机会看到PWM波形的平均电压。 我有一台MSOX3034A示波器,今天我去看了一些20kHz的PWM波形(50us PWM周期)。 令我懊恼的是,为了获得多个PWM周期的平均值,我发现需要达到很长的时间尺度。 以下是我在示波器上获得的kSa / s读数: - 1s / div(10s /扫描):25kSa / s - 500ms / div(5s /扫描):50kSa / s - 200ms / div(2s /扫描):125kSa / s - 100ms / div(1s / sweep):250kSa / s这告诉我在高分辨率模式下,示波器使用从高分辨率平均后处理的250K采样采集。 *有没有办法减少这个数字,这样对于给定的后处理采样率我可以获得更快的扫描速率?*我找不到一个。 (请告诉我有。) 以上来自于谷歌翻译 以下为原文 Hi-res mode is my most important feature of an oscilloscope; I've been using it for years on Agilent and Tek scopes. I work with motors and it gives me a way to see the average voltage of PWM waveforms. I have a MSOX3034A oscilloscope and I went to look at some 20kHz PWM waveforms (50us PWM period) today. I found, to my chagrin, that in order to get averaging over multiple PWM periods, I need to go to really long timescales. Here are the kSa/s readings I get on my scope: - 1s/div (10s/sweep): 25kSa/s - 500ms/div ( 5s/sweep): 50kSa/s - 200ms/div ( 2s/sweep): 125kSa/s - 100ms/div ( 1s/sweep): 250kSa/s This tells me that in high-resolution mode, the scope uses an acquisition of 250K samples post-processed from the high-resolution averaging. *Is there any way to reduce this number, so that for a given post-processing sample rate I can get a faster sweep rate?* I cannot find one. (Please tell me there is.) |
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此外,看起来如果按下“停止”以保留采集的数据,并放大时间刻度,则有效采集速率会发生变化(原始样本相同,但用于显示的过滤器会随着每个分区的时间而变化)。
> :( 以上来自于谷歌翻译 以下为原文 In addition, it looks like if you press Stop to retain acquired data, and you zoom in on the timescale, the effective acquisition rate changes (the raw samples are the same, but the filter used for display changes with the time per division). >:( |
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我们还有一个MSOX2014A,它不是“坏”,似乎在高分辨率平均中使用25K样本。
当您放大时间刻度时,它还会保持波形形状(+有效采集速率)。 但似乎没有办法调整它。 - 1s / div(10s / sweep):2.5kSa / s - 500ms / div(5s / sweep):5kSa / s - 200ms / div(2s / sweep):12.5kSa / s - 100ms / div(1s / sweep) :25.0kSa / s我真的只需要显示大约1000个样本。 我使用的Tek示波器和早期的Agilent示波器(例如54624A)似乎只是为每个屏幕显示点组合了样本。 我希望这种行为是新范围的选择。 :( 以上来自于谷歌翻译 以下为原文 We also have a MSOX2014A which is not as "bad" and appears to use 25K samples in high-resolution averaging. It also maintains the waveform shape (+ effective acquisition rate) when you zoom in on the timescale. But there doesn't appear to be a way to adjust it. - 1s/div (10s/sweep): 2.5kSa/s - 500ms/div ( 5s/sweep): 5kSa/s - 200ms/div ( 2s/sweep): 12.5kSa/s - 100ms/div ( 1s/sweep): 25.0kSa/s I really only need about 1000 samples displayed. The Tek scopes I've used and earlier Agilent scopes (e.g. 54624A) just appeared to combine samples for each screen display point. I wish that behavior were an option with the newer scopes. :( |
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richard吴 发表于 2018-12-20 11:30 虽然您可能在过去使用“高分辨率”模式来完成此任务,但实际上从未真正采用“正确”方式。 高分辨率模式不是用作过滤器,尽管它通常用作一个过滤器。 它旨在为恒定信号提供更多的分辨率,并且它做得非常好。 该算法针对该目的进行了优化,并且实现内置于ASIC中。 在过去,算法是完全不同的,虽然它适合您的目的,但它没有完成其声明的功能。 还有其他范围具有更多功能,包括在处理和显示路径中嵌入您自己的算法(用户定义函数)的能力。 您可能想要查看其中一个。 人 以上来自于谷歌翻译 以下为原文 While you may have used "High-resolution" mode in the past to accomplish this task, it was never really the 'right' way to do it. Hi-Res mode is not intended as a filter, although it generally acts as one. It is intended to provide more bits of resolution for constant signals, and it does that quite well. The algorithm is optimized for that purpose, and the implementation is built into an ASIC. In the past, the algorithm was quite different, and while it suited your purposes, it did not accomplish its stated function. There are other scopes with more capability, including the ability to embed your own algorithm (User-Defined Function) in the processing and display path. You might want to look into one of those. Al |
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