Electronics > Beginners
DIY Differential probe again again - please help :-)
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ogden:

--- Quote from: FriedMule on October 08, 2019, 07:41:07 am ---I have tried google and there are a lot  of links, but not any explanation on what Isolated Power means in a digital isolator.

--- End quote ---
That digital isolator IC have isolated dc-dc power converter inside. Did I answer your question? You may ask further questions.


--- Quote from: FriedMule on October 08, 2019, 07:41:07 am ---I am not sure what I need, isolated or differential.
My goal is to be able to measure two different places at once, i.e before the bridge rectifier and before a chip much later in the circuit.

--- End quote ---
For that you do not need differential probe, nor 500MHz bandwidth. As you ask surprisingly simple questions, I am afraid that instead of building something safety-related, you shall consider buying one or two HV diff probes: https://www.eevblog.com/product/hvp70/. Alt least then there will be less chances of you killing yourself.
FriedMule:

--- Quote from: ogden on October 08, 2019, 08:01:22 am ---
--- Quote from: FriedMule on October 08, 2019, 07:41:07 am ---I have tried google and there are a lot  of links, but not any explanation on what Isolated Power means in a digital isolator.

--- End quote ---
That digital isolator IC have isolated dc-dc power converter inside. Did I answer your question? You may ask further questions.


--- Quote from: FriedMule on October 08, 2019, 07:41:07 am ---I am not sure what I need, isolated or differential.
My goal is to be able to measure two different places at once, i.e before the bridge rectifier and before a chip much later in the circuit.

--- End quote ---
For that you do not need differential probe, nor 500MHz bandwidth. As you ask surprisingly simple questions, I am afraid that instead of building something safety-related, you shall consider buying one or two HV diff probes: https://www.eevblog.com/product/hvp70/. Alt least then there will be less chances of you killing yourself.

--- End quote ---
Thanks for your concern! the "funny" thing is that I know way more about main power and have done several installations, while I know nearly nothing below 220V.
I am not concerned about my safety, since I will take safety precautions that can be considered total over"kill":-)
I have seen what power can do when it want to and that's scary!! 400V 1000A can do things a hand grenade only can dream of!

But on the other side, will I keep it below 50V, my example was bad but just to illustrate that I want to neasure one place with the normal probe and then the other with the isolated probe. One of the hard ting to do I to search or explain what I want when I don't know the therms, words and possibility, on top of that is my English wary bad and do not make it easier.

When I have found out what i need, isolated or diff, then begins my search again for articles, diagrams and gerber files. :-)
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