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How to check a 230VAC sine/modified wave with an oscilloscope (FNIRISI 1013D)
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juan3211:
Thanks this is a new option, but as I already have the transformer, how do I need to connect the secondary? Thanks


--- Quote from: wasedadoc on March 19, 2023, 11:51:41 am ---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.

--- End quote ---
juan3211:
This is the transformer what I have. Tyco

wasedadoc:

--- Quote from: WackyGerman on March 19, 2023, 12:12:34 pm ---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

--- End quote ---
I already attached a relevant extract from the manual in Reply #3.
WackyGerman:
Oops , you`re right  :-DD
Fungus:

--- 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.
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