Electronics > Beginners

can I build this curve tracer circuit with an AWG?

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k8943:
Found this lab exercise which corresponded to exactly what I wanted to practice: use XY on scope to visualise characteristic of MOSFET using a function generator.

https://inst.eecs.berkeley.edu/~ee100/sp06/labs/guide08.pdf

On reading through it seemed to make sense but when assembled the first circuit (just to test passives) at the bottom of page 2, it occurred that this wasn't  going to work: my scope (DS1054z) and AWG (SDG1032X) are both grounded.

Attaching probe 1 to the "-" output of the AWG is not going to (and doesn't!) give a great result.

Have I misunderstood something or would the students have had different kind of equipment? Any suggestions for an elegant way to do this experiment?

rstofer:
It certainly looks like the FG is floating and that the scope ground clips would go to the ground point.  There are some cheap battery powered function generators around.

If you are thinking in terms of something much more elegant, try SLab:
http://r6500.blogspot.com/2018/02/slab-first-release.html

I built up a PCB for this project and it came out well.  I have some great curve traces but I'll point out that it was just for giggles.  I haven't used it for anything important because I can do similar things with the Digilent Analog Discovery.  But the fact that the software is all Python based is pretty compelling.

The thread that got me started:

https://www.eevblog.com/forum/microcontrollers/small-lab-(slab)-release/

soldar:
Yes , it requires the signal generator to float.

Better get a wooden one :)

John B:
Why can't you swap probe A1 and ground so that the scope and AWG share the same ground, then subtract A1 from A2 on the scope? Can the rigol source one of the XY axes from the math function?

rstofer:
There's a pretty popular curve tracer called an Octopus.  I haven't built one but here is a video:



You can also Google for 'octopus curve tracer'.

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