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| How to check a 230VAC sine/modified wave with an oscilloscope (FNIRISI 1013D) |
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| Zero999:
--- Quote from: Fungus on March 19, 2023, 01:11:23 pm --- --- Quote from: juan3211 on March 19, 2023, 12:16:40 pm ---That is precisely what I want to check. Pure sine waves, or modify ones. What about connection to the secondary of transformer? --- End quote --- A transformer can change the shape of the wave. The most accurate way is with a 100x probe... or make a box with a resistor divider in it. --- End quote --- Yes a transformer will distort this signal a little, but not enough to be visible on an oscilloscope at mains frequencies, you'll still be able to distinguish between a modified and pure sine wave. Most of the distortion will occur at higher frequencies, so there might be some ringing on the modified sine, but it should be fairly obivous. |
| juan3211:
Even for compare several "pure" sine waves between them, or several modified sine waves between them ? Do you think tha transformer will not modify enough the waves? May be only a very high frequencies? Thanks. --- Quote from: Zero999 on March 21, 2023, 09:20:34 am --- --- Quote from: Fungus on March 19, 2023, 01:11:23 pm --- --- Quote from: juan3211 on March 19, 2023, 12:16:40 pm ---That is precisely what I want to check. Pure sine waves, or modify ones. What about connection to the secondary of transformer? --- End quote --- A transformer can change the shape of the wave. The most accurate way is with a 100x probe... or make a box with a resistor divider in it. --- End quote --- Yes a transformer will distort this signal a little, but not enough to be visible on an oscilloscope at mains frequencies, you'll still be able to distinguish between a modified and pure sine wave. Most of the distortion will occur at higher frequencies, so there might be some ringing on the modified sine, but it should be fairly obivous. --- End quote --- |
| tggzzz:
--- Quote from: juan3211 on March 21, 2023, 10:48:52 am ---Even for compare several "pure" sine waves between them, or several modified sine waves between them ? Do you think tha transformer will not modify enough the waves? May be only a very high frequencies? --- End quote --- You have to define what "compare" and "modify enough" means. That implies you have to define your objectives. Other snippets from your posts.... --- Quote from: juan3211 on March 19, 2023, 01:07:20 am --- I haven't still recieved it but two different YouTubers have confirmed me that they have already measured 230VAC mains waves. --- End quote --- Youtubers also confirm the world is flat, that 5G causes cancer, and that the world is run by giant reptiles living under a mountain. Given that, what's your point again? --- Quote from: juan3211 on March 19, 2023, 12:16:40 pm ---That is precisely what I want to check. Pure sine waves, or modify ones. --- End quote --- As others have stated, to check that you don't need to make a physical connection - just hold a probe near the output and capacitive coupling will show you enough to distinguish that. --- Quote from: juan3211 on March 19, 2023, 01:16:03 am ---So if I want to check my home circuit (ground +neutral+phase, generally neutral is connected to ground in grid's substation) how do I need to connect transformer secondary outputs ? What is the correct option? --- End quote --- The correct option is to read and understand the references in https://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/ There are many obvious and subtle ways in which a beginner or experienced professional can damage themselves or scope or UUT. |
| juan3211:
Thanks a lot. I must admit that my posts are not clear enough. Now I know that these two YouTubers how review the 1013D don't know a lot about it or about electronics in general. I want to test several inverters and signals. All 230VAC RMS. My goal is to check if it is pure sine or not, and this is very easy. But also, I am asking myself if there are also differences among pure sine waves , and among modified sine waves. I am sure that they are. The Fnirisi 1013D has a FFT (Fourier) to see harmonics of a signal, and may be I could compare this data among pure sine to see the quality of them. Probably main's harmonics will be different than an cheap Chinese inverter. I dont need to compare them with high detail, but yes basics. May be I have explained (with my words) better. Thanks a lot guys! |
| wasedadoc:
You are overthinking this. Just get started by holding the probe near an insulated output from the inverter. No connection needed. There is a good chance that will tell you all you want to know. If not, you can proceed to a more advanced method. |
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