All Questions
10 questions
0
votes
2
answers
201
views
Are common mode chokes really needed for Conducted Emission standards when there are only two terminals?
Common mode chokes make sense for power inputs when there are three terminals: power line, power return line and an "earth ground". You measure the noise of power line with reference to ...
5
votes
4
answers
3k
views
Is it safe to connect AC earth to DC negative?
I'm going to use a switching mode power supply in a product. When I use no earth connection in the input, the metallic body of the PSU gives a little electric shock. (it has ~70V AC with reference ...
- 71
4
votes
5
answers
3k
views
Paintless (raw) aluminium enclosures connected to Earth: Bad practice?
I am producing a system with aluminium enclosures all connected to a central unit which is connected to Earth. All the enclosures of the system have their chassis ground connected together via cable ...
- 179
0
votes
0
answers
41
views
Using a Plug-In AC/DC adapter Output's Negative as Earth GND
Now, this is not a general question about any plug-in 12V DC supply with a barrel connector output. They are all different. There are those without Eath GND wire in the AC power input, those with it, ...
- 116
2
votes
1
answer
171
views
What is the purpose of connecting your reference ground plane to earth when doing radiated emissions testing?
In most standards it's required to connect the reference ground plane to earth.
However in a lot of cases the reference ground plane is elevated above the earth by a set height.
If you left the earth ...
- 187
12
votes
4
answers
4k
views
USB peripheral: connecting USB shield to GND?
I have read through many recommendations articles, and many StackExchange questions, but haven't come up with any clear understanding as there are many conflicting information out there. The simple ...
- 173
2
votes
0
answers
137
views
Where exactly earth current flows-SMPS/DC-DC and DC-AC
Ashamed to ask this question after having lot of experience in Converter designs. i always heard and learnt from Sr. Mentors that For better EMI performance we need to give path for conducted noise(...
0
votes
3
answers
648
views
Is EMC shielding of a grounding wire required?
Consider the following 2 use cases:
Fully electric vehicle with 2 different insulated voltage systems: 1 high voltage @1000V DC insulated from chassis and 24VDC system with minus pole (-) at chassis. ...
- 1,090
0
votes
1
answer
114
views
Earth alternative
I'm designing an industrial machine which is AC motor derived. There are sensitive analog sensors (e.g. Load cell) in the system and in the user's site, Unfortunately earth connection is not ...
2
votes
1
answer
177
views
Connection between metal enclosure and 0V in industrial system?
I have been testing an industrial system. I have developed a test device to properly test this industrial system. I am currently finalizing the test device and have put it in an enclosure to EMC proof ...
- 408