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117 Threads found on Earth And Ground
Using iron pipe, fittings and residential water heater elements I have made steam cleaners. They do rust up pretty quick. I like to ground the body to the source AC earth ground lead, but the heater elements seem to be pretty well isolated from the fitting. The heater elements are usually discarded with the hot water (...)
You can make a simple experiment and connect the oscilloscope probe tip to ground instead of power supply output, with same ground clip connection, you'll seeing probably the same "spike" that isn't actually existent in the circuit. It's a common mode interference, coupled through oscilloscope earth connection, causing a (...)
Reducing ripple by the present inductor circuit seems to me as an error of reasoning. You get the same boost inductance by series connecting both windings, but avoid the common mode problem. I guess the oscillating Iout current is pure common mode, it's not realistic that a differential current bypasses the 25 ?F capacitor.[/Q
Not sure if I can picture what you described, but I also accidentally burned equipment connected to the oscilloscope, on two occasions. In the first case, the oscilloscope was connected to the power socket without isolating transformer, and the ground of the probe shorted to earth of theelectric mains. In the second case, it was measuring 2 (...)
Just to check whether it's just a GND symbol mismatching on your diagram or if it's a conceptual issue, but did you electrically connected the circuit GND reference to one of the phases of the electrical mains ? There should be the earth instead the isolated ground. If this is the case, and was not the Neutral, the motor winding can be induc
There are at last two meanings of isolation here. One for safety from lightning transients and one for common mode noise isolation between the AC and DC ground. Normally AC transformer line is earth grounded to what is called Neutral (N) while the other line (L) is hot (H). There can be considerable (...)
Hi, I have a Aluminium chasis robot, the wheels are metal (but wrapped in rubber tank tracks - so no connection to earth). I have various voltages on the system 12v to motors and shield, 7 v to Arduino and R Pi 3's (via DC-DC converter). Should I just onnect allthe -ve terminals of my batteries (some lipo some nimh) to the chasis ? (...)
Current is flowing in closed loops. Neutral and live designation is a matter of circuit earth connection and doesn't affect the current flow as long no ground faults occur.
I seem to remember that while doing path propagation analysis, because of the atmosphere and knife edge diffraction, the radius of the earth was taken as 4/3 of the actual value. But I do not know if these effects are valid for Mars. Frank
Power supplies can be made two ways. The secondary's can be referenced to earth ground or totally isolated, also called floating. For the record it is against electrical code every ware, to use the building earth ground to power anything. It's sole purpose is to trip the circuit breaker.
Ccm is parasitic capacitance from any part of the flyback to earth ground/case. I found "Design of a TL431-Based Controller for a Flyback Converter", and it does not have an input filter or any capacitor to the case.
Provided the SMPS injects high frequent currents between case and other parts of the circuit, connected either to the mains or isolated output circuit, the primary EMI reduction means is having input and output filters, not returning the current to the earth ground. Any EMI current flowing through the earth (...)
Consider what happens in case of a near by lightning strike, and I'm sure you'll want to keep the signal ground separated from cable shield and earth.
It is quite appealing to betake the metal surface of the case as an efficient ground plane for the GND power bus, but doing that you will put the circuit in direct contact with earth, which is not a good idea in terms of safety. You could alternatively place an intermediate plate(GND) between the chassis(earth) and the (...)
thanks, but even then sometimes they connect the neutral to the output common so that the output common is earthed. (remember that neutral is connected to earth in the vicinity of the building or installation)
If a supply is truly floating, then earthing any point in it will not cause a short. If putting a earth on a circuit causes a short then the circuit is not floating. Frank
Hi all - I'm ignorant with regards to basic understanding of electricity/electronics - I have researched, and I believe I know the different theory/explanations for all three ground schemes but what I need to know is whether I can make all three common (tie them all together) in order to eliminate the humming noise I hear when connecting my (...)
Yes, your measurement is being affected by the isolation transformer capacitance to earth, and the high input impedance of your scope and whether your scope ground is earthed... put a slight load on your bridge rectifier (1-10mA)
If your Neutral is also very well earthed, you don't get a difference current by this method, just an additional load current. If the "leakage" resistor is connected between earth ground and phase, as indicated in the schematic, it will generate about 23 mA residual current with 230 V mains voltage which should be well (...)
Have you actually got a ground pour on the board? Or is it just a copper pour that's not connected to ground? A floating pour may well be the issue going off your description, while it's in your hand it's being grounded via you & when on the table it's not. Or it could be because you have 3 ground nets (...)