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Questions tagged [shielding]

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

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RFI protection for a stepper motor controller

I'm building a remote tuning device for a magnetic loop antenna. It will use a stepper motor to turn the shaft on the mag loop's variable capacitor. The electronics will consist primarily of a ...
0
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1answer
32 views

Grounding and shielding between isolated devices

I have a battery operated micro controller with a hall sensor, mounted on a motorbike. The hall sensor has a shielded cable to counteract spark plug induced EMI. By default, the entire setup is ...
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3answers
51 views

If a PEC surface completely reflects an EM wave, why doesn't an ungrounded shield work?

I was thinking about shielding and its effectiveness. An ungrounded shield doesn't work well for either inductive or capacitive coupling. However, if you think about plane wave theory, a PEC surface ...
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1answer
67 views

Could shielding (not grounded) affect signal integrity?

I'm trying to shield 6 flat cables that give me some communication issues because I thought that there might be cross-talk or other sources of interference that cause the problem. The shielding is ...
2
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1answer
46 views

Motor / VFD / Protective Earth

I have little experience with AC motors since I'm majoring in Mech.E. My team is setting up an AC motor with a VFD to control the movement of an airfoil inside a metal cage we built. I understand the ...
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1answer
61 views

Shield ground to metal body or signal ground?

I have a question about grounding. I will have two short shielded cables with signal wires inside, located at the top of a tower. The cables have a grounding wire inside shorted to their foil shields ...
4
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1answer
60 views

Ground planes disposition in Ethernet connection

I am designing a board that will have sensible analog signals and a processor communicating with the external word via Ethernet and I want to avoid that common mode currents couple into my analog ...
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1answer
104 views

Voltage detected across Micro USB cable shielding

I designed a Keyboard PCB using an ATmega32U4 with the data lines wired up to a Micro-USB B Receptacle. Brand: Molex; part number: 1050170001. The USB ground is directly connected to the Micro-USB B ...
0
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1answer
97 views

4 pin connector is melting even with 5 volt and 0.1 amp power supply, Why?

I am using a connector as shown: . I am using this to connect to my camera, which works at 5 volts and 0.1 Amp. But this connector works only for few days and then the plastic portion of the ...
4
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2answers
76 views

Why is shielding effectiveness different for various hole geometries?

I have run into the equation below in various literature/app notes. (example). I have never seen the derivation for such an equation and don't understand why round apertures are more effective at ...
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3answers
54 views

RS422 Full-Duplex Cable Shielding

I need to interface two PCBs via RS422 (250kbps) in full-duplex mode (4-wire, 2-twisted pairs 100ft cable). This system will operate in a noisy (CNC) industrial environment, ie, industrial controls ...
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115 views

Connecting the Chassis Ground and Signal Ground in my PCB

I have been reading alot of questions on this site to clear my understanding on Chassis, Signal Ground, ...
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1answer
126 views

Analogue (or digital) signal integrity with multiple sources of noise

tldr: Can I transmit an analog signal through a noisy environment without it being corrupted, or should I use a digital signal instead? My requirement is to transmit a signal from a MA3 absolute ...
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2answers
89 views

Should I use shielded RJ45 plug by the computers? [closed]

If I have shielded cables, jacks and plugs and I ground the shielding properly, then should I use shielded plugs at the computer's site too? I mean if I do so, then the shielding will be connected to ...
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1answer
41 views

ADC wire is picking up noise from cellular antenna [EMC]

I have a 5 wire micro jst cable with a line for ADC readings from an IR sensor that is picking up interference from the cellular antenna of the microcontroller. Will I be able to reduce this noise if ...
0
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2answers
236 views

How close to a stepper motor do I need to shield the wires?

I am trying to shield the cabling on my CNC mill. The motors, unfortunately, do not have connectors but instead have wire leads coming out from the motor housing. I can cut those wires about an inch ...
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2answers
99 views

Strategies to reduce EMF radiation

During a long-term, almost six month long, data acquisition in a proximity of scanning electron microscope I have found a significant source of magnetic field noise, which is altering the results. I ...
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1answer
143 views

Effects of Neodymium magnets on PCB

I'm currently doing a project that consists of: Arduino Nano. Battery. Buck Boost converter. GPS module. TSL2561 light sensor. BH1750FVI light sensors. LSM6DS3 Accelerometer. HDC1080. MicroSD shield ...
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1answer
90 views
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1answer
214 views

Why is the usb shield always tied to ground (GND pin)?

The shielding on a cable is to avoid interference from the outside world however it is always tied directly to the GND pin. Not inside the cable itself but inside a device. Every single device I take ...
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1answer
37 views

Testing the integrity of cable shielding for suitability

I am currently working with an ECG cable, is there a way for me to test the integrity of the shielding of the cable without using it directly on an ECG monitor to check for interference.
4
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2answers
1k views

Long wires causing Raspberry Pi to die?

I've been working on a simple project involving a Raspberry pi and some switches. I would never thought I would have any problem for something as simple as a switch, but here I am. The 2 wires from ...
1
vote
1answer
388 views

Why do USB data cables have 5 wires, what is the use of shielding wire?

I have always been curious about the 5th wire(aka shield wire) in USB cables. What is its purpose? Does it anyhow affect charging speed for mobiles or data transfer? I do know that it carries the ...
1
vote
1answer
151 views

USB shield for analog and digital ground?

I'm new to Mixed-signal design and I'm having trouble deciding how to connect my digital and analog ground. I'm doing a 4 layer design, so I have a split ground plane. As I understand, since I'm ...
2
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2answers
55 views

Help Shielding RF Anechoic Chamber - FM Stations

a collegue and I acquired a surplus small anechoic chamber (8 ft x 8 ft) for making some pre compliance test measurements, and we're running into the issue of FM Stations being only attenuated around ...
1
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3answers
171 views

Using shielded audio cable for potentiometer sensor

I'm trying to measure a potentiometer from an Arduino's ADC. The potentiometer has a maximum value of 100k ohms and is located about 1 meter from the Arduino. The potentiometer's wiper is wired to the ...
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0answers
45 views

How does the size of a conductor affect a driven voltage?

I'm designing a capacitive sensor which uses an active shield to focus the sensing field. This much works well. Now, in order to most effectively protect the active signal from noise I'd like the ...
2
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1answer
372 views

SD card connector chassis grounding

I have been designing a PCB which includes an SD card connector. As I'm not a PCB designer expert, I was looking for a reference design when I came across with the circuit bellow, extracted from Texas ...
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2answers
91 views

What does metal to metal bottoming mean?

Some connectors datasheets specify the following: Metal-to-metal bottoming for maximum EMI shielding under extreme vibration Reference: Dualok Connectors I have also encountered the following for ...
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2answers
133 views

Does burying a cable shield it?

TL;DR: Does burying a cable provide shielding? I.e., is a shielded cable in air equivalent to an unshielded cable buried ~ 6 inches in soil? Long: I'm a technician at a university. I don't have ...
2
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2answers
571 views

Shielded cable, to ground or not, in amplifier

I have been looking for an answer on the net about this question but not found it fully answered. The topic has been up here a few times (see links below) as well but I find the answers lacking. My ...
1
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1answer
121 views

How to shield a battery powered instrumentation with USB interface?

I would like to ask for advice on shielding the following setup. I have a measurement target sitting inside a Faraday cage, connected through a shielded cable to a measurement circuit. The cable ...
1
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1answer
57 views

dip switch electric shield

I have ordered a Reed Relay with a diode and electric shield, but I am not sure how to connect the shield to the rest of the circuit because I do not know what the shield does and how does it work in ...
1
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3answers
86 views

Is there any sense in carrying assembled enclosed electronics in a static-shielding bag?

Say I have a Raspberry Pi enclosed in a metal case, such as this: Would it offer any additional level protection if I put it in a static-shielding antistatic bag whenever I carry it around (e.g. ...
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2answers
182 views

How should I use a static-shielding bag prior to opening, and why?

After grounding the ESD mat and wearing the properly grounded anti-static wrist strap, what is the correct process to take the contents out of the static-shielding bag and take it onto the antistatic ...
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0answers
152 views

Can a grounded static-shielding antistatic bag be used as a circuitry work surface to protect from ESD?

Basically, I have looked around about how to take proper care with respect to ESD and I am quite confused. I know an antistatic bag of any type would not provide additional protection from ESD if used ...
0
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1answer
51 views

A question about AC Ground and Shielding

I see this question on EE but reading those I am not sure they answer what I am asking here. This is the problem. I am designing an audio device that is powered by an external 15VDC adapter. This ...
3
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4answers
349 views

Electromagnetic shielding and EMP

I've asked several related questions, but I'm afraid that some of the answers that I received, while great answers, might be skewed because of incorrect assumptions or unclarity in my questions. The ...
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2answers
80 views

Is it easier to attenuate a sine wave or a more complex wave?

All other variables being equal, how does waveform complexity of a plane wave affect shielding effectiveness? Is it easier to attenuate a sine wave or a complex waveform?
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0answers
85 views

Skin effect of copper in a high-strength AC magnetic field

I'm trying to determine the thickness of copper foil required to construct an enclosure that attenuates a very fast-rising, very brief pulse of AC magnetic field at a frequency of 1 MHz and field ...
0
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1answer
86 views

How to build EMF radiation protection [closed]

I've recently started to use my laptop more and more on my lap and I'm worried about exposire to radiation emmited by the laptop. I keep it at a distance of about 10cm but still... I was wondering if ...
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2answers
188 views

What are the limitations of “fake” balanced audio cables?

I have an AV receiver providing amplified outputs and preamp outputs. The pre-amp outputs are in the form of (unbalanced) RCA jacks. My speakers are amplified and have a balanced input. I was ...
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3answers
1k views

Why is a caseless PC not an EMI problem?

As I understand it, the case of a PC is metal so that it can form an EMI enclosure around the electronic parts. My view is reinforced by there being conductive fingerstrips around the mating edges. ...
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vote
4answers
200 views

Blocking cell phone interference on LM386 amp

I built a small amplifier using an LM386 on a protoboard. The problem I have however is that it makes those typical cell phone sounds if my mobile phone is close to it. Since I want to 3d print an ...
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2answers
970 views

DMX: What should I do with ground and shield?

I'm currently developing a DMX interface (master interface) with USB and Ethernet connections. The power for my device I'm retrieving from the 5V of the USB connector. The shield of the USB connector ...
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2answers
2k views

How can I make a diy anechoic chamber?

I'd like to make a small anechoic box for RF measurements. I need roughly a 30x30x30cm cube of usable space, and I'd like the reflections from the walls to be attenuated by 10dB or more from 100MHz ...
0
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1answer
56 views

If I run electrical current through the conductors in a magnetic shield, can It be used to shield stronger magnetic fields?

I'm wondering if running electrical current through a shield amplifies its effect to a significant extent, effectively making it into a shield you can "turn on and off" for stronger magnetic fields ...
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1answer
43 views

Current Rating of Stepper Shield Ground Wire

I have a 2 phase bipolar stepper motor; https://catalog.orientalmotor.com/item/all-categories/20mm-pkp-series-2-phase-bipolar-stepper-motors/pkp214d06a-2 Its 4 power wires are wrapped in a shielded ...
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3answers
165 views

EMI shielding without shield? [closed]

Hi I sorted of had an epiphany when thinking about EMI shielding a PCB... If the frequency of the system on a PCB was constant ( lets 20MHz digital system or something) could I take advantage of that ...
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2answers
775 views

Confusion in grounding shield wires of transducers

There is a 6-wire Wheatstone bridge type load-cell and one of the wire is called shield and it is electrically connected to the metallic case of the load cell as below(I marked that with yellow ...