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Old 6th November 2013, 11:00 PM   #431
1audio is offline 1audio  United States
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Here is a like to the manual for the TEK IC test fixture for their curve tracer http://www.ko4bb.com/Manuals/Tektron...ons_Manual.pdf It will give you lots of details and you may be able to make a clone enough to try it with Locky's curve tracer. If you do I'm sure others will be interested.
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Old 7th November 2013, 12:41 AM   #432
locky_z is offline locky_z  China
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My tracer can't match OP characteristic. Because it is the highest resolution and only 1 ~ 2mV.
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Old 7th November 2013, 01:33 AM   #433
rsavas is offline rsavas  Canada
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http://www.ti.com/lit/an/snaa047a/snaa047a.pdf
A good read!!
and
http://www.google.ca/url?sa=t&rct=j&...,d.aWM&cad=rja

Last edited by rsavas; 7th November 2013 at 01:52 AM.
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Old 8th November 2013, 12:09 PM   #434
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Default Finally got to use mine

But not without an issue appearing. my N MOSFET curve looks fine but my P MOSFET curve has issues. Any suggestions? Possibly a faulty relay?
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File Type: png MOSFET Curve.png (40.5 KB, 455 views)
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Old 8th November 2013, 12:38 PM   #435
rsavas is offline rsavas  Canada
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Yup. something hairy going on, looks to be noise, could be bad connections.
How do pnp bjt's measure?
Lawrence, I should apologize for this statement
Quote:
Linearity/distortion. You do not trust what TI specifies, good luck proving them wrong. I do not think that you can afford the equipment necessary to make a claim like that.
After reading Bob Peace's article's, it would be interesting to test for opamp linearity, as he has done. Bob Pease was a magnificent contributor to electronics.
As in traditional TI fashion, they removed the authors name from their updated app note, a shame really.

Last edited by rsavas; 8th November 2013 at 12:46 PM.
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Old 8th November 2013, 10:37 PM   #436
Sk8Ter is offline Sk8Ter  United States
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Quote:
Originally Posted by rsavas View Post
Yup. something hairy going on, looks to be noise, could be bad connections.
How do pnp bjt's measure?
Lawrence, I should apologize for this statement
After reading Bob Peace's article's, it would be interesting to test for opamp linearity, as he has done. Bob Pease was a magnificent contributor to electronics.
As in traditional TI fashion, they removed the authors name from their updated app note, a shame really.
its alright don't worry about it...I think its important to test all components in a piece of sensitive electronics including op amps etc..

Lawrence
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Old 8th November 2013, 10:51 PM   #437
locky_z is offline locky_z  China
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Quote:
Originally Posted by jkuetemann View Post
But not without an issue appearing. my N MOSFET curve looks fine but my P MOSFET curve has issues. Any suggestions? Possibly a faulty relay?
Try connect a 100ohm resistor between PMOS gate and socket B.
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Old 20th January 2014, 01:49 PM   #438
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Default expanding on this design

Hi locky_z,

Are you still working on your tester design or is it considered a finished product?

I started a new thread for something that is somewhat similar to your excellent design, although a little different:

Convenient USB based transistor tester

If you are open to expanding on your idea, perhaps you would participate in the design work on what I have proposed.
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Old 30th March 2014, 05:26 PM   #439
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Default Curvetracer failed

Hi all:
I tried emailing locky Z yesterday but no reply yet. I have a curvetracer 3 months old...and the PC s'ware config 'device not detected' no longer detects it although the PL2303 port is detected and the curvetracer relays click once the USB is connected. I am using Com4 as the virtual port as indicated by the device manager, Win XP SP3. No yellow flagged driver probs.

Reinstalled the supplied PL2303 driver (2013) with no probs.

Any thoughts on what to do?

thx
Ancel

Last edited by Mosaicmerc; 30th March 2014 at 05:46 PM.
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Old 30th March 2014, 07:27 PM   #440
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Default Intermittent

After removing the cover and measuring the key voltages, Vcc = 41, then 24, 12.16 and 5.1. Also tested the insulation of the transistors from the alum. sink which were ok. I tried it again and it started working.

So I don't know what it is yet, although the hand soldering job seems a bit poor.
Anyway I reassembled and it is still working for now.

Burnt out 2 small signal transistors by trying Hfe scripts w/o identifying if they were PNP or NPN. So the overcurrent LED works as well....
Auto tested a DUT to identify an NPN...works fine.. Did some HFe scripts on it...seems ok. Seems the Ic is measured in decimal mA....but volts are in V.
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