Intelligent Curve Tracer 3.0 release - Page 6 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Vendor's Bazaar

Vendor's Bazaar Commercial Vendors large & small hawking their wares

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 20th October 2012, 01:23 AM   #51
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
Quote:
Originally Posted by Orion33 View Post
locky_z


When I press "Go!", at the graph is obtained one point. In what may be problem?
1. What measurement conditions do you load?
2. Is the DTU pin correct?
  Reply With Quote
Old 20th October 2012, 10:36 AM   #52
Orion33 is offline Orion33  Russian Federation
diyAudio Member
 
Join Date: Jun 2011
1. I try measurement npn, pnp and n-fet with varios tamplates. And always the same result - one point.
2. DUT pins woks, type of elements is defined, but the measurements are not valid, for example, the drain current for 2SK170 is 663mA when the maximum possible is 16mA, and measured Hfe for 2SC1815GR is 118, when it is in the datasheet 200-400.

Have you checked my tracer before sending it? On the back written number 226#.
  Reply With Quote
Old 20th October 2012, 01:03 PM   #53
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
May be the decimal point in ads7871_v3s.ini file caused,
In some non-English windows, the decimal point is ',' instead of '.'.

You select menu 'Options->config'
Check what is the ‘B/C/E Channel PowerAmp Gain’ display? They all are 4.11.

If not 4.11, it mean your windows system read '.' not as the decimal.
Use notepad to open the ads7871_v3s.ini, and replace all the '.' as ','
  Reply With Quote
Old 20th October 2012, 01:35 PM   #54
Orion33 is offline Orion33  Russian Federation
diyAudio Member
 
Join Date: Jun 2011
In INI file on CD that you put in the package, all the gains values are 2.

First, you write that the separator should be ".", And then say to replace all "." to ","... I enter a value through a point, but after opening it changes to a comma.

Ok, so it works! I ran the new version without the old ini file.

New question. What values have resistors RB and RC? Values in old ini are correct?

And can you write a manual, how to calibrate tracer? I see, that ADC values on Option/Diagcostic window are not 5V.
  Reply With Quote
Old 20th October 2012, 04:36 PM   #55
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
You can download the "Locky_Z curve tracer CT3 Install manual.zip"

DIY Curve Tracer for PC
It is at 263#

It talk about the RB and RC Values and how to calibrate.
  Reply With Quote
Old 20th October 2012, 09:32 PM   #56
Orion33 is offline Orion33  Russian Federation
diyAudio Member
 
Join Date: Jun 2011
A year ago, I was working with I/O board manufactured by National Instruments and measured some Soviet FETs. To do this, I was written in LabVIEW similar curve tracer. Unfortunately, your algorithm is in the manual in Chinese, so I can not compare it with mine. But I can compare the results.

PIC19.png

Blue is measured with NI (how much is average, I do not remember)
Red - with tracer with averaging 10 times
Green - with checkbox "Calibration" and averaging 66 times

JFET was n-channel 2P303A

I think that the curve tracer is noisy and suitable only for qualitative screening and selection. To measure the quality of a semiconductor, such as the homogeneity of the slope, this unit in this version is not suitable. Need to work on the noise level. Or am I doing something wrong?

And where are points with the gate voltage -0.09, -0.28 and -0.64V?
  Reply With Quote
Old 21st October 2012, 12:44 AM   #57
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
My instrument is difficult to distinguish within 2~5mV voltage.
So the Vgs-Id/Vbe-ic curve that Vgs/Vbe less 1V is limited accuracy.


For your J-FET measure , you use RC=1K or 12K?
Because your Id is less 1.5mA, If you select RC=1K,
On Id=0.2mA position,The Vrc(Voltage drop of RC) only 0.2V,If the resolution of my curve is 5mV, On this position, Means that the Id error will reach 5/200=2.5%,


If you select RC=12K, then on Id=0.2mA position,The Vrc(Voltage drop of RC) is 2.4V, Means that the Id error only 5/2400=0.2%.

Select big value RC, can get more precision, but you must remember, The Vds(Vce) + Vrc must less 36V. Because 36V is the power supply limite.
  Reply With Quote
Old 21st October 2012, 11:06 AM   #58
Orion33 is offline Orion33  Russian Federation
diyAudio Member
 
Join Date: Jun 2011
I used a template, there was selected 75 ohm. I do not remember what resistance I used in my curve tracer. Or 500 ohm or 1K.

The menu for the 2 values ​​1K RC: 1K, 75, 1K, 12K. By default, the template is selected 75.
PIC20.png
I think that resistors values ​​in the menu are not correct. How to fix it?
Using the second value 1K or 12K curve becomes much smoother, you are right
PIC21.png
  Reply With Quote
Old 21st October 2012, 01:39 PM   #59
locky_z is offline locky_z  China
diyAudio Member
 
Join Date: Jun 2004
Location: XH
In fact, RB / RC value of template can be change, It depends on your measurement range.


The formulation of the measurement conditions can refer to the following schematic.
Click the image to open in full size.

System only can measure the Vbe/Vce/Vrc/Vrb, and the voltage resolution is 2~5mV.
So if you want more precision, then the Vbe/Vce/Vrc/Vrb much larger than 5mV. Such as more than 0.5V.

The current measurement is based on the I= V / R.
So you have to choose RB/RC large enough so that the volatge drop on resistor is much larger than 5mV.

But RB/RC can not too big,because
1. Vrb(Voltage drop of RB) + Vbe must less than 36V.
2. Vrc(Voltage drop of RC) + Vce must less than 36V.

Last edited by locky_z; 21st October 2012 at 01:41 PM.
  Reply With Quote
Old 21st October 2012, 02:30 PM   #60
Orion33 is offline Orion33  Russian Federation
diyAudio Member
 
Join Date: Jun 2011
Thank you, I understand. The question was in another. The drop-down list contains two values ​​1K. But in terms of errors, the first value is less than 75 ohms. What resistors are mounted on the board in reality, and how to determine it?

The values ​​of RB: 500, 6K, 91K, 1360K
The values ​​of RC: 1K, 75, 1K, 12K
  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
Curve Tracer Stefanoo Equipment & Tools 79 21st February 2014 10:12 AM
curve tracer barclaycon Equipment & Tools 6 11th February 2010 09:10 PM
curve tracer? maxpou Solid State 4 24th October 2009 06:29 PM
intelligent semiconductor characteristic curve instrument locky_z Parts 14 7th November 2008 12:07 AM


New To Site? Need Help?

All times are GMT. The time now is 03:46 PM.


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