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How to check a 230VAC sine/modified wave with an oscilloscope (FNIRISI 1013D)

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juan3211:
Thanks a lot
 
With all your suggestions, it is clear for me that I can't use the 1013D "directly".

I will use with a transformer.

What do you know about the options that I have proposed in my previous message ?  (A, B, ...C ?)

I already have a transformer, so I don't need to buy an expensive 100x probe or differential probe


--- Quote from: nctnico on March 19, 2023, 01:39:43 am ---The Fnirsi 1013D is not designed to be used as a floating / isolated oscilloscope. It does not provide the necessary isolation barrier to be safe to use / touch / operate even when running from it's internal batteries. Battery operated oscilloscopes are typically NOT suitable to measure dangerous voltages. Only when the models that have dedicated, high voltage CAT rated isolated inputs (IOW: a high voltage differential probe built in), they are safe to use on mains directly. The tell tale sign is the price; oscilloscopes with isolated inputs are very expensive (starting from ball park US $800).

--- End quote ---

modoran:
Specs you linked are fake, already proven by various eevblog members. Do not trust what fnirsi says in their advertisements.

Yes, using a isolated transformer and measuring only secondary output will be fine ( except the signal amplitude, of course ).   But beware that not all "inverters" output sine waves, most of them don't.

wasedadoc:
If you only want to determine the waveform shape you only need a few pieces of insulated wire. Wrap 10 cm of one around a wire from one pole of the inverter output  Likewise wrap another around a wire from the other pole. Connect the 10x probe tip to one of the wires - not an inverter output.  Likewise connect probe clip to the other wire.  There will be enough capacitive coupling between inverter output and probe to safely give a small signal to the scope.

If you need to know the effective amplitude use a true RMS voltmeter.

Most low price inverters give "modified sine wave".  Just a few discrete levels.  Fine for switch mode PSUs and purely resistive loads.  May not be good for 50/60Hz transformers, motors etc. Heed any such warnings in the inverter's user manual.

WackyGerman:
In the manual you get all the information you need . You have to to prepare your own 100x probe for doing this measurement . Go to "http://www.fnirsi.cn/support" and then choose FNIRSI 1013 D English manual.pdf

juan3211:
That is precisely what I want to check. Pure sine waves, or modify ones.

What about connection to the secondary of transformer?

Thanks


--- Quote from: modoran on March 19, 2023, 10:55:38 am ---Specs you linked are fake, already proven by various eevblog members. Do not trust what fnirsi says in their advertisements.

Yes, using a isolated transformer and measuring only secondary output will be fine ( except the signal amplitude, of course ).   But beware that not all "inverters" output sine waves, most of them don't.

--- End quote ---

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