Timeline for Mystery of the 50Hz artifact generated with a turned off smart plug and a laptop charger
Current License: CC BY-SA 4.0
7 events
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| Jun 6 at 14:12 | comment | added | user373724 | Thank you a lot for the explanation! I think I am starting to understand what you mean and I am going to try it out in the next days! However, I am still a bit confused about one thing: when I don't use the laptop charger at all and plug the power strip(on) in the smart plug (off) I can measure a very high voltage (over 800V). If I plug the power strip directly in the wall outlet and measure the voltage in the power strip it is lower (~116V). For me that would indicate that the problem is already there without the laptop charger or do you think another component could have the same problem? | |
| Jun 6 at 13:56 | comment | added | Andy aka | It's all to do with which conductors (live, neutral or both) are disengaged when the switches are turned on and off. These are the unknown factors so, get rid of them because they will just defocus you on understanding the problem. Try the charger in the AC socket in one direction then, try it in the other and see what the 50 Hz amplitudes are. If a lot different to each other then my answer is likely correct (seen this many times also). The set-up of the experiment is preventing you from seeing the reality of the situation AND, that set-up in undefined electrically. Simplify to understand! | |
| Jun 6 at 13:33 | comment | added | user373724 | Thanks! Sorry for asking this stupidly but could you still maybe shortly explain to me how this property is influenced by the setup of the experiment in the different conditions? How comes that the setup wall outlet+ power strip+ laptop charger behaves as expected and does not produce a 50Hz artifact when the power strip is turned off but the setup wall outlet+ smart plug+ laptop charger does produce a 50Hz artifact when the smart plug is turned off? While wall outlet+ power strip(on) + smart plug(off) +laptop charger behaves normally and produces no 50Hz artifact? | |
| Jun 6 at 13:21 | history | edited | Andy aka | CC BY-SA 4.0 |
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| Jun 6 at 13:21 | comment | added | Andy aka | @user373724 the 60 Hz bit was an error and, I meant 50 Hz. Fixing in 1 minute. Fixed. | |
| Jun 6 at 13:19 | comment | added | user373724 | Hi thanks for the answer! I am sorry to ask but I don't quite understand your explanation. If I understand you correctly on the DC side there should be a 60Hz artifact and on the AC side there is a 50Hz artifact and the noise I am seeing is in fact not a 50Hz but a 60Hz artifact? While that is possible I do not understand yet how this property of the laptop charger is changed by the setup of the experiment, e.g. by using the turned off smart plug versus not using the smart plug? I would really appreciate it if you could add more details as I do not have a good electrical engineering background | |
| Jun 6 at 12:53 | history | answered | Andy aka | CC BY-SA 4.0 |