Thanks Andrew, crossed wires 😱
Re, capacitive coupling, that's ok, my lack of understanding, thought it may have meant capacitive via earth rod as often getting a good connection can be tricky. I should ask more questions......maybe not!
Re, capacitive coupling, that's ok, my lack of understanding, thought it may have meant capacitive via earth rod as often getting a good connection can be tricky. I should ask more questions......maybe not!
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Forget mother earth... its for the PE ONLY. Maximum interference rejection, think about military aircraft and say specifically the bits on the outside of the wings, missile launchers etc. they have to be immune from interference, very immune... they are but no direct contact to mother earth.
Same with vehicles, any vehicle these days, they have to be immune from RF, otherwise all the complex electronics in there (and they are these days, ECU are complex multi layer boards) could go haywire, not a good idea when going down a road at 70MPH, they are immune and they are insulated from mother earth.
Have a look at the Entreq earth boxes thread... Here the myth is these earth boxes act as sinks for noise, some interesting and informative replies on that thread that will further improve your understanding of all this... I have been trying to solve grounding and noise problems for 30 years and I am still learning, luckily ALL my designs undergo extensive functional testing, measurements and EMC testing so I get lots of feedback (though most designs pass these days, that just down to experience🙂)
Forget mother earth... its for the PE ONLY.
Over here, the official name for the Protective Earth/Safety Ground circuit is:
EGC 'Equipment Ground Conductor' [circuit]
The connection to Planet Earth circuit:
GEC 'Grounding Electrode Conductor' [circuit]
Two different circuits, two different tasks. Yes they are joined together at one point, but still different tasks.
Over here, the official name for the Protective Earth/Safety Ground circuit is:
EGC 'Equipment Ground Conductor' [circuit]
The connection to Planet Earth circuit:
GEC 'Grounding Electrode Conductor' [circuit]
Two different circuits, two different tasks. Yes they are joined together at one point, but still different tasks.
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On Tony Waldron:
Tony Waldron, Technical Manager, CADAC Electronics PLC
His blog "Tony Waldron's Audio & EMC ranting and ravings" seems to have disappeared again.
"Avoiding EMI by Maximising EMC"
http://www.audioemc.co.uk/wp-content/uploads/2014/04/Pages-from-HFC_issue33-4-Waldron-EMC-short.pdf
"A Practical Interference Free Audio System" (Part 1)
Designing for Interference-free Audio System Components
"A Practical Interference Free Audio System" (Part 2)
A Practical Interference Free Audio System (Part 2)
"Designing for Interference-free Audio System Components"
Designing for Interference-free Audio System Components
"Bonding Cable Shields at Both Ends to Reduce Noise"
Bonding Cable Shields at Both Ends to Reduce Noise
Tony Waldron, Technical Manager, CADAC Electronics PLC
His blog "Tony Waldron's Audio & EMC ranting and ravings" seems to have disappeared again.
"Avoiding EMI by Maximising EMC"
http://www.audioemc.co.uk/wp-content/uploads/2014/04/Pages-from-HFC_issue33-4-Waldron-EMC-short.pdf
"A Practical Interference Free Audio System" (Part 1)
Designing for Interference-free Audio System Components
"A Practical Interference Free Audio System" (Part 2)
A Practical Interference Free Audio System (Part 2)
"Designing for Interference-free Audio System Components"
Designing for Interference-free Audio System Components
"Bonding Cable Shields at Both Ends to Reduce Noise"
Bonding Cable Shields at Both Ends to Reduce Noise
Guys thanks for all of you being kind and nice for person like me with lack of knowledge 🙂
Thank you for all your post and materials, I think it's time to learn more about that 😉
Thank you for all your post and materials, I think it's time to learn more about that 😉
I do have his Rants on PDF but as I am away from home I cant get to them at the moment.
In fact I should say that mother earth is usually for lightning rod mainly🙂
Its a big subject, with many views and topographies all work to an extent, its how far you wanna go and the environment the gear has to work in. Domestic is benign, industrial less so, aerospace/mil/automotive/medical can be a nightmare. Automotive is the upcoming area, with automotive grade components and many new safety issues as drive by wire etc. becomes more prevalent. Automotive grade devices are the new Mil spec devices as the market for Mil spec is small these days compared to other sectors so off the shelf is rare, but you can get automotive grade qualified for Mil and aerospace depending on the design.
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