EEVblog #1273 - EMC Near Field vs Far Field Explained - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: December 20, 2019, 05:50:06 am
content: An explanation of near-field vs far-field in relation to EMC compliance testing.H-field magnetic probes vs e-field electric probes.Explanation extraction from video #1176Wideband EMC log-periodic antenna:http://s.click.aliexpress.com/e/DQeIdwZ6Near field probes:http://s.click.aliexpress.com/e/N5wdxeFQ

author: VK3DRB
author_rank: Super Contributor
timestamp: December 21, 2019, 01:06:05 pm
content: Cheaper here...https://www.ebay.com.au/itm/153570679099$87 Spectrum analyser for the poor man, good enough for use with the near field probes?https://www.ebay.com.au/itm/Simple-Spectrum-Analyser-D6-with-Trace-Generator-Signals-Ratio-Frequency-Do-K7P3/223621365267?hash=item3410df3e13:g:5AoAAOSwkJxdUbT4Or a $10 spectrum analyser for the very poor man...You can also use a good CRO and use FFTs and a wideband RF preamp, instead of a spectrum analyser.But these days, considering so many products have Bluetooth and/or WiFi, the ideal for many engineers is a spectrum analyser that goes to 3GHz, or better still 6GHz. It is just a matter of time before a NanoVNA equivalent in the form of a decent spectrum analyser becomes available at a fraction of the cost of a traditional spectrum analyser.

author: VK3DRB
author_rank: Super Contributor
timestamp: December 21, 2019, 01:13:17 pm
content: Maybe a better deal, inside a case...https://www.banggood.com/Geekcreit-Spectrum-Analyzer-USB-LTDZ-35-4400M-Signal-Source-with-Tracking-Source-Module-RF-Frequency-Domain-Analysis-Tool-With-Aluminum-Shell-p-1494125.html?cur_warehouse=CN

author: VK3DRB
author_rank: Super Contributor
timestamp: December 23, 2019, 12:58:23 am
content: You can also build your own near field test probes...https://interferencetechnology.com/diy-near-field-probes-preamplifiers/

author: ocw
author_rank: Regular Contributor
timestamp: December 23, 2019, 01:39:25 am
content: The Seeed 114990711 / RFEAH-25 20 - 6000 MHz magnetic field probe is just $27.50 at Mouser.See:http://statics3.seeedstudio.com/assets/file/bazaar/product/RFExplorerRFEAH_25datasheet.pdf

author: arildj78
author_rank: Regular Contributor
timestamp: October 08, 2020, 09:38:14 pm
content: @EEVBlog, are you still planning to show a DIY solution for far field measurements? So far I've seen some content on near field EMC pre compliance but DIY solutions to far field measurements are rare.

author: EEVblog
author_rank: Unknown
timestamp: October 14, 2020, 12:08:53 am
content: Quote from: arildj78 on October 08, 2020, 09:38:14 pmNo plans, but possible. I have a couple of far field antenna.

author: arildj78
author_rank: Regular Contributor
timestamp: December 08, 2022, 08:33:53 pm
content: @EEVBlog, do you care to revisit this? I´m still waiting for content on DIY far field measurements and how to approach the jungle of compliance as a maker.

author: EEVblog
author_rank: Unknown
timestamp: December 09, 2022, 10:40:52 am
content: Did you post this twice?I'm not sure, as I got a database error when posting my previous reply, just want to ensure something weird is not happening?

author: nctnico
author_rank: Super Contributor
timestamp: December 09, 2022, 02:26:31 pm
content: Quote from: arildj78 on October 08, 2020, 09:38:14 pmStay tuned....

author: arildj78
author_rank: Regular Contributor
timestamp: December 13, 2022, 10:51:37 pm
content: No, I didn't post twice, but I did revive an old post.Arild