DIY Curve Tracer for PC - Page 40 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th May 2013, 05:48 AM   #391
jeepy is offline jeepy  Switzerland
diyAudio Member
 
Join Date: Feb 2010
Default Lost my files!

Hi Locky_z,
I need to reinstall but I lost my files. Could please tell me where I can download?
Many thanks,
Jeeepy



Quote:
Originally Posted by locky_z View Post
Try using a different combination of resistors(RB/RC) to measure hfe-ic curve, to see if a problem occurs.

Try to use a same transistor and use different RB/RC combination to measure the curve
1.RB=1360K RC=1K
2.RB=91K & RC=1K
3 RB=91K & RC=75
4.RB=6K & RC=75
5.RB=6K RC=4.55
6.RB=500 RC=4.55

Then observe the measurement results to see if there spikes.
If the spike at the begining of curve,It is normaly.
  Reply With Quote
Old 26th May 2013, 09:04 AM   #392
diyAudio Member
 
AmpliFire's Avatar
 
Join Date: Oct 2011
Location: Tokyo, Japan


The meter goes more bad every time again.

See attached; test 3 with errors (A) and without errors (B)

All other tests: not one good test

Can I send the PCB to you for repair?

My greta thanks for your help.
Attached Images
File Type: jpg Test 1 Rb1360K Rc 1K.jpg (117.5 KB, 174 views)
File Type: jpg Test 2 Rb 91K Rc 1K.jpg (113.1 KB, 172 views)
File Type: jpg Test 3A Rb 91K Rc 75.jpg (138.2 KB, 172 views)
File Type: jpg Test 3B Rb 91K Rc 75.jpg (137.2 KB, 167 views)
File Type: jpg Test 4 Rb 6K Rc 75.jpg (135.8 KB, 168 views)
File Type: jpg Test 5 Rb 6K Rc 4.55.jpg (133.1 KB, 20 views)
File Type: jpg Test 6 Rb 500 Rc 4.55.jpg (118.9 KB, 15 views)
  Reply With Quote
Old 26th May 2013, 09:04 AM   #393
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
For example, the following figure is 75ohm relay path through which the contacts in wrong.
I use the same condition and the same BJT to repeated measurements.
Click the image to open in full size.
The curve is strange.

But I keep the measure condition, just replace RC=75 with RC=4.55,
Then the curve as follow
Click the image to open in full size.
The curve is normaly.

So it mean that the RC=75 relay path throught have some wrong.


The RC(75/4.55) path as follow figure
Click the image to open in full size.
RC=75ohm throught a->b->c->d
RC=4.55ohm throught m->n->o->d
Because the RC=75 have some wrong, that mean the path a->b->c->d have some wrong.
You can short the 'ab' or 'cd' and test again, If the curve is OK, then mean the short contact have problem. replace the relay.
Attached Images
File Type: png 1.PNG (77.9 KB, 211 views)
File Type: png 2.PNG (63.6 KB, 216 views)
File Type: png 3.PNG (103.7 KB, 212 views)

Last edited by locky_z; 26th May 2013 at 09:07 AM.
  Reply With Quote
Old 26th May 2013, 09:23 AM   #394
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
Quote:
Originally Posted by AmpliFire View Post


The meter goes more bad every time again.

See attached; test 3 with errors (A) and without errors (B)

All other tests: not one good test

Can I send the PCB to you for repair?

My greta thanks for your help.
The figure have selected "cablibration before measure"?
Re-run the program and don't select "cablibration before measure" use different RB/RC combination to measure the curve again.
1.RB=1360K RC=1K
2.RB=91K & RC=1K
3 RB=91K & RC=75
4.RB=6K & RC=75
5.RB=6K RC=4.55
6.RB=500 RC=4.55

Because If the calibration relay have wrong, But if you force to calibration, the memory parameter will change, and the test will failure.
The memory parameter will restore by exit and re-run program again.


You also sent the PCB to me to repair.
  Reply With Quote
Old 27th May 2013, 03:37 AM   #395
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
Quote:
Originally Posted by jeepy View Post
Hi Locky_z,
I need to reinstall but I lost my files. Could please tell me where I can download?
Many thanks,
Jeeepy
You can join the mail list
uk.dir.groups.yahoo.com/group/CurveTracer/
The software & document have upload on it.

But every curve tracer have different '.INI' file, If you lost the ini file,you need to re-calibration and generate the ini file.
Please refer to the "Curve Tracer hardware manual" section "Instrument calibration".
Or sent me your curve tracer number and email, I will sent to you.
  Reply With Quote
Old 27th May 2013, 07:39 PM   #396
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Locky,
I have used the tracer to great success, but have been having trouble lately. I cannot measure anymore on the lowest RC setting any more and higher setting are not uch more consistent. Here is a pic of some 2sk2013 that I have and simply cannot get a consistent curve. I tried reinstalling the software, but no luck. I will also include a good set of traces, whcih were easily produced at one time.
Attached Files
File Type: pdf Chart1.pdf (14.9 KB, 28 views)
File Type: pdf Chart2.pdf (50.7 KB, 20 views)
__________________
...Shape the sound , Man!
  Reply With Quote
Old 28th May 2013, 01:09 AM   #397
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
You use lowest RC to measure the low current,the effect will be very poor.Because the Voltage drop on RC is too small.

Such as Id=2mA,Rc=4.55ohm,then Vrc=9mV, and the device resolution is about 2mV,So it measure 9mV will have some fluctuate.
  Reply With Quote
Old 28th May 2013, 10:38 AM   #398
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
The fets are run at between 45ma and 500mA, depending on the circuit so the lower Rc is applicable. The second graph shows successful testing at the lower Rc setting, as you can see. The first graph also includes traces taken at next step higher, and still showing inconsistency. I had already traced this bunch once at lower Rc setting but lost or deleted the file. I now cannot get it to work properly. I am also having inconsistent results with large TO247 die mosfets.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 28th May 2013, 12:31 PM   #399
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
I'm not sure what you mean.
You say you have two sets of tracers, one of which if choice lowest RC, the measured results fluctuated considerably?
  Reply With Quote
Old 28th May 2013, 02:00 PM   #400
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Chart 1 shows the most recent test under two different Rc settings. The uglier line being associated with the lowest Rc setting. Chart 2 shows the complimentary part, 2sj313, measured under the same conditions, a couple of months back. I have masured this part successfully in the past using the same conditions, but deleted the file. For some reason, I can no longer replicate the test. The same is true for testing larger die n-channel mosfets.
__________________
...Shape the sound , Man!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Using The Tektronix 575 Curve Tracer Mark A. Gulbrandsen Solid State 29 21st May 2012 07:01 PM
B-H Curve Tracer gpapag Equipment & Tools 9 16th January 2011 08:22 PM
curve tracer? maxpou Solid State 4 24th October 2009 05:29 PM
Virtual Tek 576/577 curve tracer in EWB V10 jackinnj Equipment & Tools 0 1st March 2007 01:41 PM
FS: tektronix 575 curve tracer SQ Kid Swap Meet 3 11th July 2004 04:22 PM


New To Site? Need Help?

All times are GMT. The time now is 01:35 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2