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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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