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Old 2nd March 2012, 08:38 AM   #101
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Tank you
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Old 2nd March 2012, 03:42 PM   #102
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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)
Help please
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File Type: jpg CURVE1.jpg (466.3 KB, 672 views)
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Old 2nd March 2012, 05:06 PM   #103
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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
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Old 3rd March 2012, 08:52 AM   #104
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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
File Type: jpg FQA19N20 Test03032012.jpg (383.0 KB, 636 views)
File Type: jpg FQA19N20 ZOOM INTest03032012.jpg (361.3 KB, 602 views)

Last edited by Bksabath; 3rd March 2012 at 08:54 AM.
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Old 3rd March 2012, 01:21 PM   #105
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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
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Old 3rd March 2012, 03:47 PM   #106
pchw is offline pchw  United States
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Quote:
Originally Posted by kannan_s View Post
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?
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Old 3rd March 2012, 05:17 PM   #107
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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.
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Old 4th March 2012, 02:04 AM   #108
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Quote:
Originally Posted by pchw View Post
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
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Old 4th March 2012, 02:06 AM   #109
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Quote:
Originally Posted by kannan_s View Post
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.
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Old 4th March 2012, 02:10 AM   #110
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Quote:
Originally Posted by Bksabath View Post
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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