[问答]

N8975A Thot怎么正确测量未知源的ENR

问答对人有帮助，内容完整，我也想知道答案 0 我在hot / Cold Load＆amp; amp;中找到了旧线程附带的pdf。 N8975A和其中一段提到：'22。 PHOT应显示噪声源过量噪音。您可以替换任何噪声源（未知或已知）来测量其过量噪声（以dB为单位）（相对于kTB）。只要您在校准过程中使用的噪声源与未知噪声源处于相同温度，就会根据校准参考测量所测量的过量噪声。 “我正在尝试使用N8975A来测量我的噪声源（未知噪声源）的ENR我的问题如下：1）所以我实际上可以使用标准安捷伦噪声源在rm temp下校准N8975A，并通过查看它实际测量ENR的Phot 我未知的噪音源？ 2）如果未知噪声源放置在80摄氏度（323.15k）的热板上，并且使用已知噪声源进行校准并且rm温度为303k，我可以正确测量未知源的ENR吗？我是否必须进行任何计算以消除校准n实际测量之间的温度差异？谢谢你最诚挚的问候以上来自于谷歌翻译以下为原文 I found the attached pdf from old thread on hot/Cold Load & N8975A and one of the paragraph mention that : '22. PHOT should show the noise source excess noise. You can substitute any source of noise (unknown or known) to measure its excess noise in dB (relative to kTB). So long as the noise source you used during the calibration process was at the same temperature as the unknown noise source, the excess noise measured is now measured against a calibrated reference. ' I am trying to measure ENR of my noise source (unknown noise source) using N8975A My question as follows: 1) So i can actually cal N8975A with the standard Agilent noise source at rm temp and by looking at the Phot it actually measure ENR of my unknown noise source? 2) what if the unknown noise source is place at a hot plate of 80 degree C (323.15k), and the calibration using the known noise source was done and rm temp 303k, Can i measure the ENR of the unknown source correctly? do i have to do any calculation to remove the temp different between calibration n actual measurement? Thanks Best Regards Jas 附件 Using N8975A in Manual Mode.pdf50.4 KB 0
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答案对人有帮助，有参考价值 0 嗨Jas - 请使用附件，对噪声源进行手动模式测量。 1）+所以我可以用rm temp的标准安捷伦噪声源校准N8975A，通过观察它实际测量我的未知噪声源的ENR？+使用手动模式可以测量Phot和Pcold值噪音源。 ENR将为Phot（dB） - Pcold（dB）。在所附文件中，Phot为13.896dB。 Pcold为0.143 dB，13.896 - 0.143 = ENR为13.753 dB。 2）+如果未知噪声源放置在80摄氏度（323.15k）的热板上，并且使用已知噪声源进行校准并且rm温度为303k，我可以正确测量未知源的ENR吗？我是否必须进行任何计算以消除校准和实际测量之间的温差？+噪声源的ENR将增加10log [Tplate / Treference]。由于温度升高，T板= 323.15°K和干扰= 303°K = 0.279 dB ENR增加。请记住，这里讨论的主题是噪声源的ENR。测量的总体不确定性中的另一个关键参数是ENR不确定性。 NFA不会测量此参数。为了对N2002A进行测量，需要使用带有金标准噪声源的噪声源测试装置。问候 - 以上来自于谷歌翻译以下为原文 Hi Jas - Please use the attached document to make a Manual Mode measurement of the noise source. 1) +So I can actually cal N8975A with the standard Agilent noise source at rm temp and by looking at the Phot it actually measure ENR of my unknown noise source?+ Using Manual Mode will allow you to measure the Phot and the Pcold values of a noise source. The ENR will be Phot(dB) – Pcold (dB). In the attached document the Phot was 13.896 dB. Pcold was 0.143 dB, 13.896 – 0.143 = ENR of 13.753 dB. 2) +What if the unknown noise source is place at a hot plate of 80 degree C (323.15k), and the calibration using the known noise source was done and rm temp 303k, Can I measure the ENR of the unknown source correctly? Do I have to do any calculation to remove the temp different between calibration n actual measurement?+ The ENR of the noise source will increase by 10log [ Tplate/Treference ]. Tplate = 323.15°K and Treference = 303°K = 0.279 dB increase in ENR because of increased temperature. Please keep in mind that the topic of discussion here is the ENR of a noise source. Another key parameter in the overall uncertainty of a measurement is the ENR uncertainty. An NFA does not measure this parameter. In order to make this measurement the N2002A, Noise Source Test Set with a gold standard noise source would be required. Regards - 附件 NoiseSourceForumManMode.docx14.2 KB

2019-1-14 14:58:31 评论举报李欢

答案对人有帮助，有参考价值 0 醉狼工作室发表于 2019-1-14 14:58 嗨Jas - 请使用附件，对噪声源进行手动模式测量。 1）+所以我可以用rm temp的标准安捷伦噪声源校准N8975A，通过观察它实际测量我的未知噪声源的ENR？+使用手动模式可以测量Phot和Pcold值噪音源。谢谢（你的）信息.. 以上来自于谷歌翻译以下为原文 thanks for the info..

2019-1-14 15:16:02 评论举报范志坚