EEVblog > EEVblog Specific

EEVblog #1273 - EMC Near Field vs Far Field Explained

(1/3) > >>

EEVblog:
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 #1176
Wideband EMC log-periodic antenna: http://s.click.aliexpress.com/e/DQeIdwZ6
Near field probes: http://s.click.aliexpress.com/e/N5wdxeFQ

VK3DRB:
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:5AoAAOSwkJxdUbT4

Or 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.

VK3DRB:
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

VK3DRB:
You can also build your own near field test probes... https://interferencetechnology.com/diy-near-field-probes-preamplifiers/

ocw:
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

Navigation

[0] Message Index

[#] Next page