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 2nd March 2012, 08:38 AM #101 Bksabath   Banned   Join Date: Dec 2007 Tank you
Bksabath
Banned

Join Date: Dec 2007
I need much help with this now

Board is working but I have problem with mesure

I like to mesure Mosfets for matching VGS ( N type FQP19N20 and P FQA12P20)

I think I need to mesure current at a variable VGS
I have Variable VB = from 0 to 6 volts
Constant VCe =20V
Imax2000 mA

When I mesure ID I think is wrong (most probably my mistake)
Attached Images
 CURVE1.jpg (466.3 KB, 777 views)

 2nd March 2012, 05:06 PM #103 Bksabath   Banned   Join Date: Dec 2007 OKEY DOKEY Got it there is a limited numbers of calculation made using parameters Load N Vgs->Id-% Highlit expression and clik edit Change Name to one of your choice then change expression on left axis to =Ic Swap the expression on X= with one on Y= and repeat top to botom botom to top. Test your mosfet Now curve will show Vgs agains Id Graph flatens out once you hit the current limit (2500 mA ) so no worries there Absolutley briliant
Bksabath
Banned

Join Date: Dec 2007
Lcky-Z
your curve tracer is realy good tanks for making it
I hope You will make more and better (more voltagge and current)

PS If this unit can be modified for more Voltagge and Current let me know please)

Lazy Butt
Realy tank you wery much for making this possible.

Now proper show of gratitude well due

Bit of back ground
I was matching FQP19N20 for my F5
I use 24 V 2A and constant themperature of 50 C (this takes loads of time and fine calibration to get thigs right and constannt results)

I have made same mesurament using same pre sorted, with above method, mosfet

Graph show the 6 curves of 2 controll devices and 2 pairs

The curve tracer confirm the results I was gettin before
Graph one and Zoom in.

Best money I have ever spent IMO

PS Am I the only one to get this working so far?
(some how I dont think so)
Attached Images
 FQA19N20 Test03032012.jpg (383.0 KB, 739 views) FQA19N20 ZOOM INTest03032012.jpg (361.3 KB, 700 views)

Last edited by Bksabath; 3rd March 2012 at 08:54 AM.

 3rd March 2012, 01:21 PM #105 kannan_s   diyAudio Member   Join Date: Jun 2009 Hi I think you are the only one got the first set. I am still waiting because of the shipping from Europe. It will be a good idea if you can post some sort of user manual , how to do it right or what might be useful first steps I am planning on using it for Small signal FETs when it arrives
pchw
diyAudio Member

Join Date: Apr 2006
Location: Fremont, California
Quote:
 Originally Posted by kannan_s Hi I think you are the only one got the first set. I am still waiting because of the shipping from Europe. It will be a good idea if you can post some sort of user manual , how to do it right or what might be useful first steps I am planning on using it for Small signal FETs when it arrives
Shipping from Europe? So it is shipped from China -> Europe -> US?
__________________
- Fred -

 3rd March 2012, 05:17 PM #107 Bksabath   Banned   Join Date: Dec 2007 Lazy-Butt had a few ( 3 units) to post on his trip back to France maybe thats why I got there this early I am shure the rest be there soon. I got really surprised on how easy it is first of all to install and then use Don't know about how to do it right part. I am shure there are better qualified people out there but shure why not You got guide on how to test N mosfets already. From what I have saw to set up the formulae you folow more or less same guidelines as one would do for Excell. No problem messing things up as is on the CD And if it stop responding (this was my fault unplughed/ plughed cable ) Just reload and run the configuration again. (May save you 3 minutes of panic panic ) It would be great that Locky_z had a go first and then we can all chip in and translate. So I would say fire up questions and see Not that I had much trubles understanding what is already in the manual. I think I said this alredy the best money I have ever spent.
Lazybutt
diyAudio Member

Join Date: Mar 2009
Quote:
 Originally Posted by pchw Shipping from Europe? So it is shipped from China -> Europe -> US?
Yep, as Bksabath said, I was on business trip last week, so a few lucky ones got it shipped from France and got it faster (and cheaper).

All curve tracers from now on will be shipped from China as I have no plans to return to Europe any time soon..... BTW... next batch will be shipped this weekend... I'll contact you guys for payment (around ~8 units this week)

Fred

Lazybutt
diyAudio Member

Join Date: Mar 2009
Quote:
 Originally Posted by kannan_s Hi I think you are the only one got the first set. I am still waiting because of the shipping from Europe. It will be a good idea if you can post some sort of user manual , how to do it right or what might be useful first steps I am planning on using it for Small signal FETs when it arrives
Kannan,

I put a link to download the user manual in the GB thread (2nd and 3rd posts). For me it was enough to get me started and trace some curves almost straight out of the box.

Lazybutt
diyAudio Member

Join Date: Mar 2009
Quote:
 Originally Posted by Bksabath I think I said this alredy the best money I have ever spent.
Geez thanks ! that is heart warming.. makes me think the GB was well worth the effort.

That being said, the biggest credit should go to Locky_z for developing such a good device and software !!

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