Products > Test Equipment
How to check a 230VAC sine/modified wave with an oscilloscope (FNIRISI 1013D)
juan3211:
Thanks a lot, here, in a previous post I asked for this topic , but someone has ansemwer me that I could lost few armónicos but nothing about changing the shape.
So then the use of transformer is not an option for you, is it ?
I have changed the topic of the post to help.other with same question.
--- 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 ---
wasedadoc:
You will easily distinguish between pure and modified sine wave by just placing the scope probe tip close to an insulated cable from the inverter output. No connection required.
Or two multimeters, one true RMS and one not. (Most analogue meters are not). If they read the same within meter tolerances it is pure sine.
juan3211:
But as you know we always want more, and I want to see the curve and compare curves of different inverters, ....
--- Quote from: wasedadoc on March 19, 2023, 01:51:57 pm ---You will easily distinguish between pure and modified sine wave by just placing the scope probe tip close to an insulated cable from the inverter output. No connection required.
Or two multimeters, one true RMS and one not. (Most analogue meters are not). If they read the same within meter tolerances it is pure sine.
--- End quote ---
juan3211:
Hi, what do you think is better ?
Make my own 10x divider with 10 X 1 Mohm resistors and use the 10x probe (total 100x, and I don't care of I measure 232 or 235 because of different values in resistors)
Or a transformer 230/48 and measure with 10x probe ?
I think I will use one of these options. What do you think?
I hope you understand that I don't want to buy an expensive 100x probe afte buying a cheap oscilloscope, and only for a few test.
Fungus:
--- Quote from: juan3211 on March 20, 2023, 06:50:44 am ---Hi, what do you think is better ?
Make my own 10x divider with 10 X 1 Mohm resistors and use the 10x probe (total 100x, and I don't care of I measure 232 or 235 because of different values in resistors)
--- End quote ---
I would use 200k resistors so your 'scope doesn't affect the circuit so much.
--- Quote from: juan3211 on March 20, 2023, 06:50:44 am ---I hope you understand that I don't want to buy an expensive 100x probe afte buying a cheap oscilloscope, and only for a few test.
--- End quote ---
Just don't cheap out on the precautions. Be aware of polarities, etc. It might even be wise to measure across a resistor in the middle of the chain so there's always a megaohm or so between you and the electrons. Everything else should be in a box with just that one resistor exposed.
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