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Old 5th July 2013, 07:08 AM   #111
generg is offline generg  Germany
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Thanks Locky_z...!

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Old 7th July 2013, 10:02 AM   #112
The Dastardly Dad of Three
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Default Curve Trcer with Windows 8

Quote:
Originally Posted by locky_z View Post
The the latest pl2303 driver for win8 is only suit pl2303HXD chip,
But i use pl2303hx, So you need use the 1.50 version driver, and you must no allow window8 auto update to the latest driver version.



The curve software on yahoo group is the latest version.
CurveTracer : Locky_z's Curve Tracer
Locky- I had some time to try this out with Win8 using your suggestion above. It works so far. Here are the steps in case it helps anyone else who wants to use this tracer on a win8 machine.
1) Disable Autoupdate (you can search for Autoupdate under System and select what level of autoupdate you want)
2) Install driver
3) Reboot PC
4) Plug in CT and launch software - it may work for a while then it will say device offline.
5) Unplug CT, reboot
6) Plug CT back in and launch software. After a few min the software will detect the CT and all is good from there.

If i find any major probs I will let you know.
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Old 7th July 2013, 10:07 AM   #113
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Here is the link to the post written by Locky which teaches you how to do the FET characteristic curves:

DIY Curve Tracer for PC
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Old 8th August 2013, 02:53 PM   #114
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I try to measure only one 2SK170 for 21 times.
As in the attached file, the results are different among 21 measurements.
The error range is too high, so that I wonder whether I made any mistake or not.
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Old 8th August 2013, 03:08 PM   #115
Orion33 is offline Orion33  Russian Federation
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I do not see any file.
Here are the results of my measurements 10 pieces 2SK369. It'sseen that the error is less than 1%.
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Old 8th August 2013, 03:23 PM   #116
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Forgot
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Old 8th August 2013, 04:35 PM   #117
Orion33 is offline Orion33  Russian Federation
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In my opinion, accuracy this device is normal for amateur class.
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Old 8th August 2013, 04:38 PM   #118
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Quote:
Originally Posted by super_voz View Post
I try to measure only one 2SK170 for 21 times.
As in the attached file, the results are different among 21 measurements.
The error range is too high, so that I wonder whether I made any mistake or not.
Heating the same devcice multiple times will cause heat buldup in the fet which could easily cause slight alteration in test.
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Old 8th August 2013, 07:46 PM   #119
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Quote:
Originally Posted by super_voz View Post
Forgot
you are kidding right?
The variation is in the avarage range of 0.02% or so, beside like it's been mentioned here, thermal plays a big rule and temperature changes over time and different set up can produce slightly different results too, especially considering that a Jfet is temperature dependent. This tool rocks!
I have it and I think it is a lot of bang for the buck! Easy to use, precise enough, very flexible and very cheap!

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Old 9th August 2013, 01:37 AM   #120
locky_z is offline locky_z  China
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If you want to get the transconductance of a FET.
After you get the Vgs-Id curve, and hold down left mouse button and draw a rectangle.
When you release the button, It will display a menu, there are two menu item.
One is 'V=[xxx-xxx]Calculate' one is 'I=[xxx-xxx]Calculate'
You can select the 'V=[xxx-xxx]Calculate'.
It will display a data window as this:
Click the image to open in full size.
The transconductance display in column of 'line slope'. and it also sorted.
Its units depend on your X-axis and Y-axis unit, if the Y axis is the mA, then it is measured in ‘ms’, if the Y-axis unit is A, then its units of ‘S’.

The 'different%' mean the 'line slope' value compare with previous 'line slope'.
example: second line,'different%' is 0.06021%
The calcute process is:
(23.5829-23.5687)/23.5687*100%=0.0602%



This calcuate use 'linear least squares' to get a straight line
y=a*x+b
Click the image to open in full size.
Here 'a' is the transconductance. and show it in column 'line slope'.
The R2 is 'product-moment correlation coefficient '. It is closer to 1, then the original curve closer to a straight line.


You can change the calcuate range,you will get different line slope.


You can refer to wiki
Simple linear regression - Wikipedia, the free encyclopedia
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