Questions tagged [shielding]
Questions regarding shielding devices against noise, interference, or ESD. Not to be confused with arduino-shield.
343 questions
0 votes
2 answers
146 views
How Does a Faraday Cage Not Radiate?
I am confused at how a Faraday cage can shield enclosed electronics without becoming an antenna. Situation 'A': Consider a particle inside an ungrounded metallic Faraday cage whose charge oscillates ...
- 883
0 votes
1 answer
120 views
Metal shield near field far field
I'm researching metal shielding. Near-field, electric/magnetic fields: absorption (skin effect) Far-field, working waves, plane waves: reflection (impedance work) This is what I understand. However, ...
- 17
4 votes
5 answers
1k views
Why does grounding eliminate mains hum but not radio signals?
I'm a mechanical engineer, so my electrical knowledge is limited, but I still don't understand the grounding of antennas. The strings of a guitar will produce interference with the music signal ...
- 127
3 votes
0 answers
106 views
How to properly shield my system
I have two systems connected via a shielded cable that carries both data and power. I'm trying to minimize EMI both inside and outside the system and also I want to protect my system from ESD. I ...
- 79
4 votes
2 answers
261 views
How do you EMI ground stuff in the age of isolated switch mode PSUs?
All modern PSUs are switch mode, with isolation transformers inside. Some don't have an earth pin, and those that do (like some phone chargers I have), the pin isn't connected to the ground shield on ...
- 7,967
3 votes
2 answers
467 views
Should I connect to case of a motor to ground?
I have this little haptic motor. Should I connect the casing of it to ground or leave it floating?
- 127
-1 votes
1 answer
74 views
Mixing J1939-11 and J1939-15
First, I know mixing these protocols for the physical layer essentially goes against J1939-11 (physical layer specification for twisted shielded pairs). However, what I'd like to know is, has anyone ...
- 111
1 vote
1 answer
65 views
Interpretation of J1939-11 Shield Recommendations
I'm going through the physical layer specification for J1939 using twisted shielded pairs. This specification is given in J1939-11. I've pulled a free version dated OCT1999 from https://d1.amobbs.com/...
- 111
1 vote
1 answer
76 views
What should I do to isolate an ADC from the voltage-output sensor we are measuring?
In the system we are developing, we need to get a voltage output level from a sensor on an industrial vehicle (asphalt-moving). We have a telematic box we are using as an industrial PC, that we ...
1 vote
2 answers
163 views
Altium designer PCB design, PCB inverted F antenna design, ESP8266
I am designing a PCB antenna (inverted F 2.4 GHz) for ESP8266. I use only 2 layer PCB. the top layer is for ground plane and the bottom layer is for 3.3 V the ESP8266 is on bottom layer. the bottom ...
- 11
5 votes
3 answers
524 views
Isolated Rs485 on PCB in plastic housing in big metal box - shield where?
I got the following situation (please excuse the crude drawing I'm on the road and had to draw on my phone). I have a PCB with an fully isolated Rs485 section, that is powered by an isolated 24V ...
- 2,032
6 votes
1 answer
376 views
Termination of individual cable shields
For a piece of test equipment being worked on I need to get signals from multiple load cells out of the hazardous test environment to a location suitable for the amplifiers/data acquisition. This is a ...
- 2,625
2 votes
2 answers
112 views
Remote low-level photodiode amplifier: preferred architecture
In working on a spectrophotometer design, I have to make a design decision for implementing the photodiode front-end amplifier and ADC. One of the requirements I have set is a dynamic range for the ...
1 vote
3 answers
296 views
Grounding Best Practices for Coaxial Shielded Cables
I've taken over designing a system that drives current (max 25 mA @ 150 kHz w/ 0-5Vpp) through a shielded SMA cable on a PCB (we'll call it PCB1) out to a user-defined circuit (circuit is unknown to ...
0 votes
1 answer
132 views
Is there any issue to connecting cable shielding through a signal pin in unshielded connectors?
I am limited to using polymer housing connectors and I cannot use standard metal housed connectors because the connection will be made in a corrosive environment. The cable itself has 4 conductors and ...
- 1