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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Digital-to-analog-converter PCB: Ground plane cut or not?
I'm designing a DAC board and I'm not sure what would be the best thing to do regarding grounding, to minimize noise.
This is the approximate layout I have so far, with the system ground point (also ...
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Acceptable resistance between hot (mains) and ground (earth)?
A DIY project I'm working on uses electronics embedded in concrete, including 110V AC heating elements. As I was verifying my wiring before testing the device I was surprised to discover conductivity ...
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Telecom Lines Conducted emissions noise travel
I am seeking an explanation of how conducted emissions on telecom lines are measured.
The frequencies of interest are at 150kHz to roughly 850kHz.
The size of the unit is 30cm by 30cm by 15cm. The ...
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Ground connection of power converter and MCU
I've designed an AC/DC power converter PCB, with input, and output voltage sensing, but I have problem connecting it to microcontroller board, i'm using F28379D launchpad as the microcontroller.
I ...
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Connecting Two 24VDC Power Supplies
I have a system that has multiple different gas detection sensors and we are datalogging our readings onto a PLC. To power our sensors we are using a 10 A power supply and have everything grounded ...
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Metal chassis grounding with wall wart supply, ESD test failed
We're building a device which takes its input power from a 12VDC wall wart PSU, and has a metal chassis. We just passed preliminary EMC/EMI test, but in the ESD test an 8kV jolt to the chassis killed ...
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Circuit works only when oscilloscope probe is connected and does not work otherwise
I have built the circuit shown below.
The problem is that the circuit only works when I connect oscilloscope probes between node-A and the ground.
If I remove or decouple the probe-ground from the ...
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Audio project converting TSH-4 headset to 3.5 mm audio jack
I've been trying to connect this TSH4 headset to a 3.5 mm audio jack. The headset has kind of a weird setup, with Mono audio + and - being the top pins (I don't know which is which, but the polarity ...
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Telecom Lines Conducted emissions [closed]
We have rented a Telecom line ISN to conduct some in-house pre-compliance testing. The test setup closely follows the CISPR32 standard. We encountered issues with conducted emissions in the lab, which ...
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EMI/EMC: Connecting PCB mounting holes to chassis in multi-board system
I am working on a system which has a metal chassis connected to the earth. The system gets power from a dedicated PSU. The power lines of the PSU (VCC_PSU / GND_PSU) are fed into a master PCB and ...
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Dedicated ground vs power cord ground?
So my Siglent 1104X-E oscilloscope has no dedicated ground- it uses the power cord's ground.
My Siglent function generator has a dedicated ground (screw terminal with banana plug option). Obviously I ...
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Can differential probes be used with floating oscilloscopes, such as handheld/tablet scopes?
I am in the market for a differential probe (and possibly a handheld oscilloscope down the track for field work). One seller I came across has a warning for many of the probes that they sell saying &...
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My isolation transformer has its protective earth connected to the output neutral. How should I rewire it for my home lab for "DUT probing"?
I have a rather sturdy isolation transformer in my home lab and I just realized that the primary side earth is not only connected to the output side earth but also to the output side neutral. I don't ...
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Why does power supply have a negative rail if can only output positive voltage?
According to the datasheet of this power supply, the output voltage goes from 0~60 VDC. If the output can't be negative, why does it have a negative rail beside ground? Why not just have ground?
In a ...
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CAN BUS Chassis Grounding
Hoping to get get some guidance on correct grounding for a CAN Bus I have designed. The following diagram gives a high level overview of the system connectivity:
Some notes on the setup:
There are a ...
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