[问答]

MSOX2024A频率测量不稳定

问答对人有帮助，内容完整，我也想知道答案 0 我最近升级到MSOX2024A并且熟悉了示波器。我唯一的DSO比较是我的Rigol DS1102D。我注意到在安捷伦30天的训练信号试验中，在测量中，似乎有更多的光标“摇晃”特别是在X轴（Freq）上，并且比我在Rigol上看到的要多得多。 Rigol测量功能可以将Freq读出两位有效数字，如MSOX2024A。使用具有10.00Mhz信号的MSOX2024A波形，它从9.95-10.05摇晃。我想也许问题可能是Wave Gen选项，但是我采用了高效率的10.0000000 Mhz信号（来自GPS-Rb锁定的HP SigGen），它在Rigol上读取稳定的10.00 Mhz的岩石，同时它在MSOX2024A上反弹。 Rigol处于与2000x相同的正常捕获模式。这是MSOX2024A的正常行为吗？谢谢杰瑞以上来自于谷歌翻译以下为原文 I recently upgraded to the MSOX2024A and am getting familiar with the scope. My only DSO comparison is to my Rigol DS1102D. I noticed in the Agilent 30-day Training Signals trial, that on measurements there seems to be much more cursor 'jiggle' particularly on the X axis (Freq) and much more than I have seen on my Rigol. The Rigol measurement function can read out Freq to two significant digits like the MSOX2024A. Using the MSOX2024A wave gen with a 10.00Mhz signal, it jiggles from 9.95-10.05. I thought maybe the problem was the Wave Gen option but I took a high-imp 10.0000000 Mhz signal (from a GPS-Rb locked HP SigGen) and its reads a rock steady 10.00 Mhz on the Rigol while it bounces around on on the MSOX2024A. The Rigol is in same normal capture mode as the 2000x. Is this normal behaviour for the MSOX2024A? thanks Jerry 0
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答案对人有帮助，有参考价值 0 好吧，它比准确度等要复杂一些。很大程度上取决于示波器的BW，噪声等，以及示波器如何进行测量。我对Rigol示波器的规格或它如何进行测量一无所知。例如，它可以将频率测量的显示限制为3或4位有效数字。安捷伦示波器通过查看计算的交叉点之间的时间来进行频率（以及其他与时间相关的）测量。它使用捕获的电压值并在此之间进行插值以显示波形并找到交叉点。信号上的噪声，无论是来自目标还是来自范围（并且总是会有一些），会导致捕获的点上下移动。该垂直噪声使计算的交叉时间水平移动。由于两个交叉点都是随机移动的，因此计算出的频率会发生变化。我不知道2000X是否使用光标进行测量，但我认为它确实如此。 DataSheet中有一个列出的光标测量规格：+/-（时基读数）+/-（。0016 屏幕宽度）+/- 100 psec由于2个光标将用于进行此测量，这将是加倍，频率结果将是反向的。计算中使用的三个单独值中的每一个都具有“正常”分布，因此我可以看到结果中的合理变化量。更高BW安捷伦示波器使用压摆率进一步指定时序误差，因为较慢的压摆率会增加噪声对测量的影响。简短的回答是，随着分辨率的提高，你的答案会变得更加可变。人以上来自于谷歌翻译以下为原文 Ok, it's a little more complicated than accuracy, etc. A lot depends on the BW, noise, etc. of the scope, and how the scope makes the measurement. I don't know anything about the specifications of the Rigol scope, or how it makes the measurement. It may, for instance, limit its display of frequency measurements to 3 or 4 significant digits. The Agilent scope makes its frequency (and other time-related) measurements by looking at the time between calculated crossing points. It uses the captured voltage values and does interpolation between then to display the waveform and find the crossing points. Noise on the signal, either from the target or within the scope (and there will ALWAYS be some), causes the captured points to move up and down. This vertical noise makes the calculated crossing time move horizontally. Since both crossing points are moving randomly, this makes the calculated frequency change. I don't know if the 2000X uses cursor to make the measurement, but I'll assume it does. There is a listed specification in the DataSheet for cursor measurements: +/-(time base * reading) +/- (.0016 * screen width) +/- 100 psec Since 2 cursors would be used to make this measurement, this would be doubled, the frequency result would be the inverse. Each of the three separate values used in the calculation would have 'normal' distributions, so I could see a reasonable amount of variation in the results. Higher BW Agilent scopes further specify the timing inaccuracies using slew rate, since a slower slew rate would increase the effect of the noise on the measurement. The short answer is, as you get more resolution, you will bee more variability in the answer. Al

2019-7-2 16:39:41 评论举报周菊