Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [shielding]

Questions regarding shielding devices against noise, interference, or ESD. Not to be confused with arduino-shield.

314 questions
19
votes
1 answer

Shielding can, what is the proper way?

I like to protect a sensitive circuit of mine with a shield. I don't have a picture but basically, I have put together a 1 mm thick ground rectangle on the top layer, and I will place the shield on top of this such that it will contact to this…
Ktc
  • 2,236
  • 3
  • 26
  • 50
12
votes
2 answers

Can a shield propagate EMI?

At a job site we typically have 10 vehicles connected to a single vehicle (star layout) by a 100m 5 conductor cable carrying power(unused), ground, shield, CANH, and CANL. The shield is grounded on both ends, but the ground is effectively the…
CoderTao
  • 865
  • 6
  • 13
8
votes
1 answer

Proper shielding techniques for chassis grounded equipment located 30 feet apart

I am just hoping to get some best practices out of this discussion: I have two pieces of equipment that are located about 30 feet apart and bolted to a metal frame (chassis ground). They interface with each other through two cables - one carries…
Peter
  • 350
  • 2
  • 13
6
votes
2 answers

Faraday cage mathematics

We all know the Faraday cage effect: light waves get through the screen on the front of your microwave oven, because their wavelength is much less than the size of the holes, whereas the microwaves don't get out, because their wavelength is much…
Nick Trefethen
  • 61
  • 1
  • 2
6
votes
2 answers

Why does a radio still work inside a metal box?

I've put a small battery powered commercial radio inside a Quality Street tin. The tin is all metal with rolled joints and the lid is a tight fit. I'd be willing to bet that there are no holes greater than 0.1mm around the lid's closure. It's a…
Paul Uszak
  • 7,517
  • 5
  • 40
  • 76
4
votes
2 answers

eliminate noise pickup from shielded enclosure's surface

I have a test instrument that measure spectral energy density versus frequency. The measurement is extremely low noise. The RF input on the test instrument is an SMA-connector where the inner conductor is for the signal and the outer conductor is…
user46688
  • 177
  • 6
1
vote
1 answer

Would there be a significant difference if a metal shield is connected or not to the circuit ground?

Assuming that we have a sensitive electronics that is battery powered, which consist of a very sensitive 32 bit adc is reading a voltage from a chemical reaction and you place it inside a chunky 1 inch thick metal shielding (I could not think of a…
DrakeJest
  • 887
  • 11
  • 39
0
votes
0 answers

Correct shielding in different situations

For me shielding is always a difficult question. I'm sometimes really unsure how I should connect the shield. What I know is that the shield should be connected with very low impedance, that for sure, but when does make it sense to connect it to the…
HansPeterLoft
  • 1,038
  • 1
  • 22
  • 40