Search Engine

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 (...)
LAB supplies and Laptop chargers are ALWAYS floating DC output. This is a safety requirement, but often bad for EMI sensitivity to high impedance inputs like microphones as the common mode noise interferes so a solid earth ground improves this. But then that makes the mic. a safety liability if there are any ground faults. (...)
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 (...)
earth ground provides a low impedance common mode shunt to stray noise generated in the differential current of a Supply and return line. When circuits connected to the lab supply have high impedance inputs they become sensitive to this CM noise if they are unbalanced and a CM current creates a CM E-field which when coupled (...)
You need an earth ground and high impedance earphone (2000 ohms) for that extremely simple crystal radio. Did you find a very old OA91 germanium diode somewhere?
UL requires a list of all component specs connected to earth ground and Ac power. for grounded cordsets, the ground entry to case resistance must be <100mOhm, which is easily achieved with welded stud with spade lugs bolted via threads. the HIPOT test must be done 100% on AC,powered units with an option for (...)
in my usb cable if i keep a multimeter in pin 1 and pin 4 i am getting 5v. if i keep one probe in +5v and and another in body of the computer are smps i am getting the same 5v in the meter. generally the body is connected to earth ground of the 3 pin socked the center pin. this means the smps supply (...)
hello, Even working in differential mode, signal is referenced from the 0V, so before, test if you have ground probleme between both equipement ... or earth connections ? any difference of potentiel (Volts AC or DC) beetwen ? if not, you can connect both 0V (5V) and 0V(Servo ground) If you detect some voltage between , or (...)
I think that you have left out the most important earth, that from the mains which goes to both the SMPSs chassis for safety reasons. This puts a nice earth loop around everything. Which means that the the outputs of the SMPSs should not be connected to chassis earth, though the chassis should be connected together to ensure a failure on the
hi, Are the 15V at 30A power supplies, earth free, ie: both the Positive and Negative outputs isolated from ground/Chassis.?? E
ground is not an earth ground, it is just a wire that is common to many parts of a circuit. 0V in most circuits including a portable radio is the circuit's ground.
Technically 0 volt of smps and earthing of power must not short.
earth and ground, really mean the planet earth. Its a safety feature. So as you are standing on planet earth, you would hope that all the metal work you can touch will not send a current through you back to earth - this can be lethal!. So its connected directly to (...)
When i told my customer about earth ground, he told me "there are another computers and PLC's. there working fine just your electronic card has problems.". it was really embarrassing. I believe he's true. The point is that PLCs and computers are designed to widthstand strong interferences. This is (...)
Hi All, Here is the basic picture below about my question. If stickman had a 500Vdc battery and he touched its + terminal and his another hand connected to earth ground (there is no connection with - terminal), was there any current over him? I think its answer is NO, because there should be connection (...)
Hi , For my bread board ground connection is required . I don't have DC power supply . Can I use Main's earth wire as bread board connection with out safty violations ? Thx, Saptha
I'm not sure what you mean by "Edison ground" , earth? How about connecting a relay between + and - , with monitoring circuit on the contacts. Cut " - " and relay's contacts change.
earth fault indicator is a protection device used with medium voltage distribution networks. It's operation is similar to RCD.
In a local network there may be hundreds of connections and because they are physically apart their local ground (earth) potentials may be different. Joining them together with the network cable could cause power line currents to flow down the network cable and in extreme cases, damage the ports on connected machines. The (...)
Hello, Is the way to do this to use Ohmmeter from mains neutral to output ground and see if its connected? (then do the same for mains earth wire to output ground and see if that's connected)?
On my board i have ground and protective earth. Protective earth is only connected to the mounting holes of the board, it is not connected to ground. Is it wise to have a separate plane for the protective earth to connect all mounting holes together? Or is is bad to have protective (...)
well, if u look at a system that hooks up to an outdoors antenna, u will likely find lightning protection circuits. Luckily microwave frequencies pass thru very small capacitances, so the first line of defense is a small series capacitor (maybe 5 pF) and a really good low ohm return path to earth ground from the coaxial cable shield. (...)
It sounds somehow arbitrary that the HV bus is grounded at the DC/DC converter, if grounded at all. Are you sure about it? Can you post the manual or a block diagram of the converter? According to my knowledge, the HV bus would usually implement isolation and an earth-leakage monitor for safety reasons.
There are different situations where "buzz" or hum can be expected: - ground loops that are created between two devices involved in an audio transmission which have both protective earth connection, e.g. a PC (always PE connected) and a TV with antenna connection - long audio cables with single ended signal connection - amplifiers without (...)
Hi Murugesh, chassis ground is normally conneted to earth to protect people touching the case. Reference ground could be floating and isolated to the chassis ground through a transformer and is the return point of the current coming from the supply voltage(negative or positive voltage). (...) could have some problems there! A mig/tig system often has a RF component to initiate the arc, and that could make the device go haywire. A buz box, especially one running in DC mode, might be less likely to generate interference since it is mostly low frequency noise. In either case, a really good earth ground, (...)
I have two design solution for low frequency (<1KHz) voltage signal amplifier, where instrument amp has fixed gain of x10 and x20 for low noise performance. The source impedance is quite low. I have one design than work on +/-5V PSU where AGND is common/analogue ground plane, which attached to -VE of the instrument amp. It would requires +/-5V P
Hello, For any given transformer isolated 230VAC mains powered SMPS, how do you know how to manage the earth grounding configuration?, ?? ?..and how do you know whether or not earth should be wired to the SMPS at all??????.. ?and how do you know whether the chassis should be connected to (...)
Is the inut "LO" terminal of the Keithley 2000 Digital meter connected to earth ground? If the front/back panel description isn't clear enough (I wonder if it could actually be), there's a text explanation in the user manual for you: The maximum common-mode voltage (voltage between INPUT LO and the chassis ground) is 500V pe
Hi, Im studying an industrial circuit.This is operating on 24V supply/200mA rated..and DIN rail mounted.. The system has got Two grounds is digital ground other is shield ground.. There is a Capacitor X1Y2 type between these grounds... I know if in an AC system..if the Y cap (i.e one (...)
The neutral is the normal "return" wire. In systems where the load is supplied from only one hot (or "live") wire, the neutral completes the circuit and carries current back from the load to the power station. All the neutral and ground (or "earth") wires in a building are tied or linked together at the incoming service (...)
'ground' is an often confusingly-used and misused term. The circuit ground in your schematic (indicated by the two standard symbols) is not necessarily connected to the real earth 'ground'. Circuit ground and real ground are separate (...)
Hello, The chassis (equipment with PE, that is three terminal plug) is used for return current if a failure occurs (live wire connects to the chassis). The current flows back via the PE (protective earth) wire that is connected to the chassis. The fuse or residual current switch activates in case of faillure. If PE is not present in such case, th