Electronics > Beginners

Nead an insulated probe for oscilloscope

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David Hess:

--- Quote from: FriedMule on June 06, 2019, 05:52:24 pm ---I can see that handheld scopes have galvanic isolated channels, would it be possible to build one, I mean a unit where you plug the standard passive probe in one end and a coax out in the other end to the scope, maybe with external power source?
--- End quote ---

That is what the A6902 is.  The probe plugs into one side and the oscilloscope plugs into the other.

FriedMule:

--- Quote from: David Hess on June 06, 2019, 08:56:25 pm ---
--- Quote from: FriedMule on June 06, 2019, 05:52:24 pm ---I can see that handheld scopes have galvanic isolated channels, would it be possible to build one, I mean a unit where you plug the standard passive probe in one end and a coax out in the other end to the scope, maybe with external power source?
--- End quote ---

That is what the A6902 is.  The probe plugs into one side and the oscilloscope plugs into the other.

--- End quote ---
Okay yes, sorry for being so noob:-)
Do you think it is realistic for me to try to build it?


--- Quote from: ggchab on June 06, 2019, 08:04:53 pm ---This also seems interesting: http://www.paulvdiyblogs.net/2017/10/differential-amplifier-probe-buy-or-diy.html

--- End quote ---
Do look interesting, again, thinking of I can manage to build anything like that?

David Hess:

--- Quote from: FriedMule on June 06, 2019, 09:34:09 pm ---
--- Quote from: David Hess on June 06, 2019, 08:56:25 pm ---That is what the A6902 is.  The probe plugs into one side and the oscilloscope plugs into the other.
--- End quote ---

Okay yes, sorry for being so noob:-)
Do you think it is realistic for me to try to build it?
--- End quote ---

Break it down into parts and start with the simple stuff.  We have the full description and schematic of the A6902.

Could you design and build a high impedance amplifier which accepts a probe signal?  That is the first stage.  If not, then no although I can think of old oscilloscopes which could provide this part inexpensively.  It just gets more complicated after this.

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