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Questions tagged [grounding]

Problems related to the connection of circuits to ground or earth references. Can affect safety, accuracy, reliability and interfacing.

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410 views

Advice for Grounding and Shield Placement

I am working on a board design which includes an ADC and a DAC. The board attaches to the headers of the Mojo V3 Spartan 6 FPGA Dev Board. The ADC has to pick up a quiet signal at the same time as the ...
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1answer
64 views

Substation grounding

I am trying to understand a grounding system for substations, fault current is something I am not getting. For example, for a small substation with some transformers, if there is a fault in the system ...
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1answer
237 views

SiPM Array, High Speed Layout

I'm working on an prototype array of Silicon Photomultipliers using the Sensl MicroFJ-60035 TSV device. It's a small 6 mm by 6 mm square-shaped BGA photomultiplier. Think of a 6x6 BGA array with the ...
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1answer
56 views

About ideal floated measurement

In the book "Grounds for Grounding", p. 573, it give a figure: And it states: In a perfectly balanced circuit (i.e., \$Z_{H} = Z_{L}\$ and \$Z_{HG} > = Z_{LG}\$), where \$Z_{HG}\$, and \$Z_{LG}\...
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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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62 views

Grounding of IT equipment for office ESD protection

We've been having a lot of problems in my office with ESD. People touch cubicle frames and monitors shut off momentarily, painful shocks through laptops, etc. I'm worried about equipment getting ...
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47 views

how to make different grounding

yesterday when i ask about driving circuit, someone told me that it is a little use in optocoupler when i use the same ground everywhere. because so far (iam a green hand in electronic) i just connect ...
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1answer
51 views

Can leakage current to ground generate static electricity?

I'm having a weird issue at my workplace where some industrial equipment is present. Almost every time I leave my laptop (with grounded aluminum body) for a while and come back I will get a quite ...
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1answer
54 views

Device's ground riding on a non-ground signal

The question is somewhat conceptual, feel free to close if it's too off-topic. If I take my portable (battery-powered) oscilloscope and try to measure the mains voltage, the connection polarity ...
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1answer
40 views

Digital signal integrity & grounding

I have a battery operated device with an old B&W LCD in it. I'm tapping to the display bus and would like to input it into an FPGA for some processing. The bus includes vertical and horizontal ...
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1answer
79 views

Power supply and pcb connections to ground, earth

I am planning a pcb which is powered by two switching power supplies LRS-150F-5 (230 V/AC to 5 V/DC) LRS-150F-12 (230 V/AC to 12 V/DC) . The power supplies are mounted in their own metal box and the ...
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124 views

Crossing ground planes with low current low frequency signals

I have a board which has two ground planes, analog and digital, that on this board are completely separate. The grounds connect on another board, which is connected via a flat cable. All signals on ...
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23 views

MAX31865 RTD converter will it acccept only floating inputs?

We intend to use MAX31865 for measuring resistance values. Since MAX31865 is RTD to digital converter, kindly clarify whether the MAX31865 will accept only floating inputs or it can be used with ...
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60 views

How should I connect the audio ground and shield wires in a Cat5 cable for analog audio?

I would like to carry 3x balanced signals to another part of my living room and I found that the cable space in the skirting boards would not allow 3x balanced cables (XLR connectors at the ends). I ...
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0answers
1k views

Why is the line-to-ground voltage half of what it should be?

Our electric power provider delivers 240 V, 60 Hz split-phase power to residential buildings. I've been checking our three-prong receptacles and I normally get the following measurements: line-to-...
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155 views

Flyback Transformer - Grounding the Ferrite Core

Today I dismantled (I hope this is the correct verb) a flyback transformer. The thing that I've never seen is that one end of one of the windings is "glued" to the ferrite core (Before you ask; yes, ...
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324 views

Why did this arduino burn out? SilentStepStick (TMC2130) stepper at 24V

I'm new to electronics. Attempting to bench-test a SilentStepStick stepper driver board, (based on a TMC2130) Using: Arduino Uno, a SilentStepStick driver board, a 0.6A stepper motor, and waterott ...
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695 views

Conductive or insulated motherboard-standoffs?

AFAIK it's common practice to mount an ATX motherboard to conductive brass standoffs inside the case. There are even metal traces around the screw holes to provide contact between the screws and the ...
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0answers
206 views

PCB layouts and polygon pours

I have been told that when laying out a PCB to keep all the polygon pours uniform on each layer. So, for example, in a corner of the PCB, you do not want the pour on one layer slightly offset relative ...
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2k views

How to calculate the earth fault current in a transmission system with no ground wire?

Background information, and my thought on the matter are provided in the end of the question. I need to calculate the fault current in case a fault occur for instance 10 km away from a transformer ...
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0answers
321 views

Grounding with a battery-powered differential amplifier

I have made a simple battery powered instrumentation amplifier (based on the AD8429 chip) for some very low noise measurements. The rough circuit diagram is below. Note that the BNC input is isolated ...
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60 views

Does regularly spaced via stitching contribute to standing waves on an RF PCB?

Should vias be irregularly spaced? Can consistent spacing between ground vias create standing waves. Has anyone ever heard of this? I've been doing this for awhile and I've never heard this and ...
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42 views

Preventing the voltage between two isolated grounds from exceeding max rating

Consider the low-side current sensing application shown in Figure 1. Grounds 1 and 2 are galvanically isolated. Assume, for example, ground 1 is the NEUTRAL line on mains power (\$V_g\$), and ground 2 ...
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389 views

Devices USB grounding

I just opened a PC a client brought, with some software problems. While fixing those problems I opened the case to check if there was something that needed maintenance and I noticed the USB shield ...
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53 views

Where to ground my system

Recently, I made a small measurement system with three boards. Below is the block diagram: The power ground cord is connected to the chassis at power entry. I think I need to connect the GND to ...
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150 views

DIN Rail with In-Rail Bus - GND/PE design question

We are designing a system that consists of several modules that are mounted on a DIN rail. They are connected to each other using an In-Rail Bus system like this: System design: The 5 bus line ...
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216 views

Connect Arduino to existing circuit with seperate power supply

I have an existing closed system that exposes several inputs that I would like to drive with an Arduino. The existing system (Neptune Apex Controller with break out box) is designed to sense the ...
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159 views

Safety/Quality issues by modding PC PSU to be floating.

Since I don't have enough money at the moment to purchase a good bench power supply, I want to 'mod' a PSU. In the first instance not by opening the PSU, but just by making an adapter that also puts a ...
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37 views

Unexplained differences in behaviour between U.FL-terminated antenna and SMA-terminated antenna

I would like your opinions/advice regarding an unexplained observation between a U.FL-terminated antenna and an SMA-terminated antenna. Both antennas are from the same manufacturer and normally tuned ...
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40 views

Why is there a positive body voltage when grounded, but none when not?

So after reading about earthing and earthing mats, I decided to make myself a very basic one for cheap to test the concept before jumping in with purchasing more sophisticated products. Here's what I ...
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25 views

How to have Wye-connected Potential Transformers(PTs) and Neutral Ground Resistor short circuit detection at my ground fault protection relay?

Detecting if the Neutral Ground Resistor (NGR) is shorted is something that must be checked at the Ground Fault Protecting Relay. The typical way to do this is to inject a DC component and to measure ...
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22 views

Extension cord from grid through GFCI outlet to off grid inverter. Does the extension cord ground need connected?

I have an off grid system: PV, charge controllers, inverters, and batteries. I want to add a 120V grid input from a GFCI outlet through an extension cord directly into the inverter AC input. However, ...
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43 views

Bootleg grounds on residential 2 wire 110v electric circuits

I bought a old duplex house with 2 wire electric circuits and 3 prong outlets. A home inspection found the outlets had no ground,the seller agreed to having an electrician "rectify" this condition ...
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31 views

shunt resistor with solar panel

I'm wondering whether the connection of the shunt resistor in this image is correct? and not having any grounding problems? Because i have already connected my shunt resistor with solar panel and ...
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52 views

Grounding the components of a DIY cnc machine

I'm in the process of building a DIY cnc machine. It already runs, but I noticed it has some interference problems (steppers act weird on occasions, the full graphic smart controller LCD has trouble ...
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42 views

Odd Ground/Power(?) issue with Mixing Desk - alternate grounding?

I am a bit stumped with this one. Unfortunately there are a few variables involved, but I will do my best to ask an answerable question.... I just built a DIY synthesizer. It functions absolutely ...
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100 views

How to line a Metal Melter secondary for higher safety

A Metal Melter is a kind of home-made low voltage (less than 40 volts, mine is 3v) welder (small-scale) made from a microwave oven transformer (MOT). I left the primary intact (the thicker wire, which ...
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80 views

PCB Grounding Plane Review

I am reviewing a 6 layer board that has analog signals on the left and right side of the board. I have always read that analog circuitry should be grouped together for easy plane segmentation. ...
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45 views

Grounding Transformer

I am designing a device with a transformer in its power supply (Hammond 270X). To follow safe design procedures, I am connecting the chassis of the device to earth ground. Is it significant whether or ...
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345 views

Connecting Protective Earth (PE) to DC ground

This question has a bit of application background so please bear with me: I'm working on a LED lighting system. The controller (MCU, led drivers and led supply) will be powered by a single DC ...
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25 views

Proper way for best fidelity to ground 1980's pro audio mixer, will grounding to the case create noise?

love this forum, this is my first post so "beer" with me. I am modding an old 1989 tascam mixer. I know its probably easier to just buy something nicer, but I got it for free and I want to use it as ...
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544 views

Grounding Neutral Off Grid Solar

Is it recommended to ground the neutral line in an off grid solar system? A nonisolated inverter would be by definition wired this way, right? I believe that in home electrical systems neutral is ...
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402 views

When is it safe to ground DC- (specifically audio output)?

With regard to audio devices, if all equipment is unbalanced and there are no DC- connections to earth ground, equipment will generally operate hum/noise free despite large common mode voltages ...
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42 views

Measurement of station grounding resistance and test electrodes

This is a pure electrical engineering question. I have seen a request for embedding test electrodes and connect them by "disconnectable" joints to a few earthing bars inside a station building, in ...
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0answers
351 views

PCB grounds either side of common mode choke

I'm modding an old PCB that was put together long before I arrived here and I'd like some thoughts on what I think is a completely useless set-up where a separate comms ground has been routed ...
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0answers
106 views

Static and Dynamic Ground Difference in Daisy-Chain powering scheme

I am using a +24 V distribution bus to transmit power to 10 loads spread over a meter (e.g. each one at 0.1 m distance). The power distributed daisy-chain style using 2x10 flat cables (computer cable) ...
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41 views

Controlling 2 PSUs with an mCU

I'm finalizing my plans to make a physical control panel to interface 2 of my 3D Printers to an embedded Linux device. (Just minimal physical controls since 95% of the controlling will be done via a ...
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0answers
69 views

Right ground connection between different blocks

Which is the right way of ground connection? Is it necessary to separately connect grounds between different blocks, without touching other grounds? Something like ground PCB trace going through ...
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0answers
315 views

PCB Layout with AGND and DGND

I have to start a layout for a PCB soon, and it contains both AGND and DGND. All the components will be on the top layer of the board (micro-controller, voltage reg, SD card, Inst. Amp etc.) so I am ...
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95 views

PC Chassis + Monitor + Cables = Ground Loop? & EMI/RFI

The PC chassis is grounded by the power cord which is plugged into a power strip. The monitor is grounded by his power cord, which is plugged into the same power strip. The power strip is plugged into ...