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Old 11th January 2013, 12:34 PM   #331
jeepy is offline jeepy  Switzerland
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OK I see! I was thinking that the load condition would set up the polarity automaticaly!
I have to learn but I anticipate this tool to be very useful for me. Thank you for your patience!


Quote:
Originally Posted by locky_z View Post
The PNP measure condition is:
Click the image to open in full size.



But from your picture,I think your condition is NPN type.
Normaly in PNP's result data,The Vce is negative, Ve is +35~36V.
Click the image to open in full size.
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Old 12th January 2013, 04:51 PM   #332
jeepy is offline jeepy  Switzerland
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Hi locky_z,
Everything works fine except that the first load condition ''PNP IC>Hfe (fix VCE)''
does change nothing so I have to enter the values manually but it is ok.
I have tested some rare parts like NEC 2sd188/2sa617, and other bipolars or power mos at 2 Amp, small bjt and jfet complementary pairs for matching.
It's a piece of cake and a real game! Also, I measured IDDS=3.61 mA, VGS=0 with the curve tracer for some 2sk30 where the battery test gives 3.54 mA with G-S short circuited, which is not bad. Anyway I need relative datas rather than absolute.
Thanks a lot.
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Old 13th January 2013, 03:30 AM   #333
locky_z is offline locky_z  China
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To measure the Idss accurately, I suggest load the measure ‘diode condition ’.
You can short the G-S and as a diode connect to C/E socket
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Old 31st January 2013, 04:31 PM   #334
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Hi locky_z

I wanted to purchase the intelligent curve tracer from ebay. I live in the US and want to carry out some analysis on my devices. If i would purchase, what would would supply as a whole kit. Do you supply the whole box or some parts have to be assembled. Also do you supply a manual or a CDROM along with the purchase?

Thanks a bunch
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Old 1st February 2013, 12:52 AM   #335
locky_z is offline locky_z  China
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The ‘Intelligent Curve Tracer on ebay’ is a whole box, you just connect it to 100~240VAC power and run the software on pc.

The ‘Curve Tracer mainboard on ebay’ is only a welding board, you need addition DC power supply / heat sink / shell.

If you purchase them ,the manual and software will send to you by email.
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Old 1st February 2013, 01:24 AM   #336
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Thanks for the reply. I will do that as soon as I get back tomorrow to my office.
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Old 6th February 2013, 11:31 AM   #337
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Hi,
I have have been trying to test small mosfets but i keep getting those strange curves.
I suspect there may be an issue with the equipment, so i`m asking for your advice.
The part being tested is ZVN3310A mosfet.
You see, the dotted line i marked is like a logical continuation of the curve, The discontinuation looks like an error of some kind..
I may be overlooking something.. ??
Thank you all.
Attached Images
File Type: jpg ZVN3310A.jpg (410.1 KB, 225 views)

Last edited by BenY; 6th February 2013 at 11:41 AM.
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Old 6th February 2013, 02:19 PM   #338
locky_z is offline locky_z  China
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It look like oscillation occur, you try connect a 10n ~ 100n capacitor parallel FET D-S. and try again.

And give me the save curve data file.
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Old 7th February 2013, 10:28 PM   #339
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Thank you..
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Old 8th February 2013, 01:23 AM   #340
alazira is offline alazira  United States
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Quote:
Originally Posted by NicMac View Post
True.
But even easier:
1) Trace all the FETS without any kind of degeneration.
2) From the traces sort and record Id @ 0V and 0.1V
3) Copy to excel (and fix all the stupid decimal and errors)
4) Calculate Yfs = (Id@0V-Id@0.1V)/0.1V
5) Recalculate Idss and Yfs for the J74 using selected Rdeg values (I use 4R3, 4R7, 5R1, 5R6, 6R2, 6R8 and 7R5).

Congratulations! - you now have 7 times as many J74 devices to choose from

6) Match you K170 and degenerated J74 devices for both Idss and Yfs.
7) Remeasure (or trace) the pairs/sets you have identified, but now with degeneration and be ready for a pleasant surprise
Hi Nic,
Thanks for these tips, but I think I need some help to understand.

Can you please detail the setting/condition you used for J74 and K170 (which load condition and if you changed any variables).

For point (5), what is the formula to recalculate Idss and Yfs using Rdeg?

For point (7), how do you curve trace with degeneration?
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