Electronics > Beginners
DIY Differential probe again again - please help :-)
FriedMule:
--- Quote from: The Senate on October 06, 2019, 09:45:07 pm ---I found the Elektor article for the probe
https://archive.org/stream/ElektorMagazine/Elektornonlinear.ir2014-09#page/n45/mode/2up
--- End quote ---
Thank you wary much, I'll read it now!:-)
FriedMule:
in the above article abut an isolated circuit there is talk about two isolated chips, the one has Isolated Power, the other not, what is that? I have looked at Wikipedia, and other places but I only find articles about sport and other like that, the wii page do not talk about Isolated Power while it do talk about digital isolator's.
ogden:
--- Quote from: FriedMule on October 08, 2019, 05:11:55 am ---in the above article abut an isolated circuit there is talk about two isolated chips, the one has Isolated Power, the other not, what is that? I have looked at Wikipedia, and other places but I only find articles about sport and other like that, the wii page do not talk about Isolated Power while it do talk about digital isolator's.
--- End quote ---
You shall try internet search instead of wikipedia. https://lmgtfy.com/?q=AMC1200. findchips.com is another good place to find chips. In short: It is ±250 mV-Input Basic Isolated Amplifier for Current Sensing. Kind reminder - that isolated probe has <= 60Khz bandwidth and it is not differential.
[edit] BTW Elektor article explains everything in details, including that chip (attach)
FriedMule:
--- Quote from: ogden on October 08, 2019, 06:07:57 am ---
--- Quote from: FriedMule on October 08, 2019, 05:11:55 am ---in the above article abut an isolated circuit there is talk about two isolated chips, the one has Isolated Power, the other not, what is that? I have looked at Wikipedia, and other places but I only find articles about sport and other like that, the wii page do not talk about Isolated Power while it do talk about digital isolator's.
--- End quote ---
You shall try internet search instead of wikipedia. https://lmgtfy.com/?q=AMC1200. findchips.com is another good place to find chips. In short: It is ±250 mV-Input Basic Isolated Amplifier for Current Sensing. Kind reminder - that isolated probe has <= 60Khz bandwidth and it is not differential.
[edit] BTW Elektor article explains everything in details, including that chip (attach)
--- End quote ---
I have tried google and there are a lot of links, but not any explanation on what Isolated Power means in a digital isolator.
Yes I saw that about the 60KHz and it is only an isolated probe but 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.
Or short, no common ground between the two measurements.
BravoV:
--- Quote from: FriedMule on October 08, 2019, 07:41:07 am ---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.
Or short, no common ground between the two measurements.
--- End quote ---
Imo, what you want there is not cheap or easy, let alone DIY project for beginner.
Usually, when the times there is need to measure this kind of measurement points, the best is to use a fully isolated oscilloscope, mostly handheld and not cheap.
No, ordinary scope can't do it, and even using HV differential scope, you need two of them. :-[
Once you own it, you can freely poke and clip the probe's ground clip at anywhere you like as below example.
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