Electronics > Beginners

Dirt cheap and simple scope-based component tester - curve tracer

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0xdeadbeef:
Hey, just don't blame me if it sucks. The only user review says that it's working well but the LCD has little contrast even at the highest setting. Then again, maybe this can be tweaked a bit.

w2aew:

--- Quote from: Aurora on June 12, 2012, 05:51:09 pm ---Here is an interesting variant with adjustable test conditions for the DUT

http://www.techlib.com/electronics/curvetrace.html

Aurora

--- End quote ---

This is a decent, more flexible variant of the original octopus idea.  The only downside I see to this design is that the voltage across the current sense resistor adds to the DUT voltage, thus adding to the apparent DUT resistance.  Not a big deal, but is a difference.  It therefore also allows for a grounded test signal source, like a function generator.

KD0CAC John:
Just to double check , some of the older analog scopes had the component test function / switch ?
Any chance the Rigol  DS1152E has that , I would guess in the menu somewhere if it does ?
And the curve tracer link , is that for scopes without the component test function ?
Just to confirm ?
Thanks

w2aew:

--- Quote from: KD0CAC John on June 12, 2012, 09:47:52 pm ---Just to double check , some of the older analog scopes had the component test function / switch ?
Any chance the Rigol  DS1152E has that , I would guess in the menu somewhere if it does ?
And the curve tracer link , is that for scopes without the component test function ?
Just to confirm ?
Thanks

--- End quote ---

A small percentage of older analog scopes had this feature built in.  Most do not.  I don't think the Rigol has the feature.  Thus, the circuit shown in the video, or in the various links in this thread, or in a Google search for Octopus Component Tester:
https://www.google.com/search?sugexp=chrome,mod=19&sourceid=chrome&ie=UTF-8&q=octopus+component+tester
can be used with nearly any scope that has an XY mode (nearly all scope should have XY mode).

Confirmed?

KD0CAC John:
Thanks
At least all of these accessories do not take up much space as some gear .

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