Electronics > Beginners

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

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w2aew:

--- Quote from: icon on June 12, 2012, 10:37:25 am ---Hi

Excellent video - you have a new fan! George Graves has already asked the first question that popped into my mind (about using a function generator) - looks like I need to do some shopping for transformers. The other question that occurred to me when I was this was - could you do something similar to produce a voltage/voltage curve such as Dave J is showing here (skip to 5min 40sec)[1]:
or is that produced in a completely different way?


--- End quote ---

In the video I showed, the scope is actually showing voltage vs. voltage in the XY mode - it just so happens that the Y axis (the CH2 input) is probing directly across a fixed resistor, so the voltage is directly proportional to the current.  This is precisely what Dave is doing in his video (voltage across a resistor).  XY mode in the scope just plots the two signals against each other (usually Ch1 and Ch2).  So, in any circuit where you want to see the response of one voltage to another, simply put the scope in XY mode.

Fraser:
George,

Reference the  ACTracerFG.....

I agree that the ACTracer-FG does not come under the 'Dirt Cheap' banner, but it is interesting to look at the design. The deigner originally used only an on-board signal source, but recently added the external Function Generator input. The PCB is well photographed, so it may be possible to work out how he has arranged the FG input without a transformer. I have meant to reverse engineer the basic circuit used but I haven't really got the motivation due to having the Huntron units.

Aurora

0xdeadbeef:
Not exactly dirt cheap, but mobile ;)

http://www.elv.de/output/controller.aspx?cid=74&detail=10&detail2=9502&flv=1&bereich=&marke=

Fraser:
Here is an interesting variant with adjustable test conditions for the DUT

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

Aurora

Fraser:
Awwwwww 0xdeadbeef, why'd you have to go and show me a portable I/V unit ..... I can't resist portable kit  :)  Thank you for the link.

My German isn't great but I managed to muddle my way through the ELV purchase process and I now have an ELV KT100 Kit on it's way to me in the UK. I bought the kit as the PCB is pre-populated with the SMD components and I think I'll enjoy constructing the remaining parts of it. Thank heavens the GBP has recovered a little against the Euro  :)

A portable unit will be very usefull when I don't want to lug around a mains powered Huntron or dual channel CRO/DSO. I found the manual for the unit here:

http://www.techome.de/manuals/58758_Komponententester_KT100_UM.pdf

The quality looks OK and I like the fact that I will have a schematic.

Aurora

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