Electronics > Beginners
DIY Differential probe again again - please help :-)
FriedMule:
I have now read several super long treads about the subject on this great forum, but I simply need some help to know how to start and to find something that do work. There is a lot of ideas and discussions and diagrams all over but it always end up s an great start but never usable or something else that stop the project in it's tracks.
What I am hoping fore is a "between" board that I can couple between my scope and my standard probe.
500MHz no need for over 65V
The image is from this site where all components are listed but you have to pay for the article: https://www.elektormagazine.com/magazine/elektor-201409/27026
I have found this article: http://blog.weinigel.se/2016/02/26/ghz-differential-probe.html
And this wary long spec sheet for the THS3201 amplifier: https://www.farnell.com/datasheets/1447056.pdf
ogden:
--- Quote from: FriedMule on October 05, 2019, 03:37:51 am ---The image is from this site where all components are listed but you have to pay for the article
--- End quote ---
This is low ~60KHz bandwidth probe isolation adapter.
MosherIV:
A simple free approach (depends on scope) to differential probing is to
Use 2 channels on the scope
DO NOT use the ground clamp of the scope probes.
Use the math function of scope, subtract 1 channel from another.
Use one probe on one measurement point
Use the probe on the other measurement point.
The math function act like a differential function between 2 channels.
FriedMule:
--- Quote from: ogden on October 05, 2019, 05:58:52 am ---
--- Quote from: FriedMule on October 05, 2019, 03:37:51 am ---The image is from this site where all components are listed but you have to pay for the article
--- End quote ---
This is low ~60KHz bandwidth probe isolation adapter.
--- End quote ---
Okay, thanks. I could not find that out just by looking at the image or components. If that had been a 500MHz would that have been enough? I mean, if all I want is to be able to measure where there is different grounds.
What about the second link, is that a usable design?
--- Quote from: MosherIV on October 05, 2019, 08:44:05 am ---A simple free approach (depends on scope) to differential probing is to
Use 2 channels on the scope
DO NOT use the ground clamp of the scope probes.
Use the math function of scope, subtract 1 channel from another.
Use one probe on one measurement point
Use the probe on the other measurement point.
The math function act like a differential function between 2 channels.
--- End quote ---
Yes fine little trick but it have to be possible to build a probe instead of having to buy a probe or reducing my scope to half of the channels?
FriedMule:
Is it posible to make this Differential probe: http://blog.weinigel.se/2016/02/26/ghz-differential-probe.html to be able to handle about 65V?
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