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Old 13th March 2012, 05:12 PM   #121
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Tanks a Bunch

Realy apreciated (a much beter explanation that I could have ever made)
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Old 21st March 2012, 12:55 AM   #122
ilardi is offline ilardi  United States
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Just received my Curve Tracer. All looks well, but I have two questions:
1)My board is missing the capacitor in the lower left of the drawing above, that was prone to being leaky. I assume it was found not to be necessary at all. Is that true? Or should I add one back?
2) What are the X,Y and Z terminals for?

Thanks

Terry
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Old 21st March 2012, 12:58 PM   #123
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I will let Locky_Z answer to your first question...

X, Y, and Z terminals are for detecting an unknown device type.
Just put a 3 legged device in X, Y, and Z and the software will tell you what type it is (BJT, JFET, etc...) and what pin X, Y, and Z correspond to.

This is the "DUT Auto Detect" function of the software

It also works for 2 legged devices such as diodes or zener...

Fred
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Old 21st March 2012, 01:39 PM   #124
ilardi is offline ilardi  United States
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Quote:
Originally Posted by Lazybutt View Post
I will let Locky_Z answer to your first question...

X, Y, and Z terminals are for detecting an unknown device type.
Just put a 3 legged device in X, Y, and Z and the software will tell you what type it is (BJT, JFET, etc...) and what pin X, Y, and Z correspond to.

This is the "DUT Auto Detect" function of the software

It also works for 2 legged devices such as diodes or zener...

Fred
Thanks Fred. I guess if I had read the documentation more closely I would have known that. Still, it is a very cool feature. I knew it was there-but now I know how to use it!
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Old 21st March 2012, 02:33 PM   #125
locky_z is offline locky_z  China
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Quote:
Originally Posted by ilardi View Post
Just received my Curve Tracer. All looks well, but I have two questions:
1)My board is missing the capacitor in the lower left of the drawing above, that was prone to being leaky. I assume it was found not to be necessary at all. Is that true? Or should I add one back?
Terry
The capacitance in red circle is 24V Filter capacitor, they areI in parallel, so install a capacitance is enough.
Click the image to open in full size.
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Old 21st March 2012, 07:05 PM   #126
ilardi is offline ilardi  United States
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Quote:
Originally Posted by locky_z View Post
The capacitance in red circle is 24V Filter capacitor, they areI in parallel, so install a capacitance is enough.
Click the image to open in full size.
Thanks for the quick feedback.
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Old 21st March 2012, 07:11 PM   #127
ilardi is offline ilardi  United States
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One more question. While I have a connector for the power supply input that will fit, could you provide the part number for the unit connector on the board. I would like to find the appropriate mating plug since the connector seems to be 'polarized' and I would like to prevent myself from plugging the power in backwards.

Thanks again.
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Old 26th March 2012, 12:48 PM   #128
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Quote:
Originally Posted by ilardi View Post
and I would like to prevent myself from plugging the power in backwards.
Wise precaution !
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Old 31st March 2012, 11:16 AM   #129
styrkv is offline styrkv  Norway
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Hi locky_z

I want to thank you for making this very useful tool, at an affordable price.

And thanks to Fred for organising the GB.

Agree with Bksabath. Best money ever spent.

I have used a 33V AC, 200VA transformer saved from a broken labsupply, and regulated it down to 31V DC with a simple zener + power darligton sceme.

There is one issue however:
In the dropdown menu for RC the choises are: 1K, 75, 1K, 12K.
If I choose the top 1K were the 4R7 choise would be I get a very low reading.

I have taken some Oscope shots from collector to ground with corresponding curves for different settings, on the same powertransistor. (2SC 3281)
VB 0.5 to 30V, 0.5V step. Constant VCE 30V. Imax 2500 mA.
1 and 2, RB 6K RC 75
3 and 4, RB 91K RC 1K
5 and 6, RB 500 RC 4.7 ?

I would be very happy if there is a way to fix this.
Please let me know if there are any other measurements you need to diagnose whats wrong.
Attached Images
File Type: png CT Test RB 6K RC 75R.png (16.3 KB, 309 views)
File Type: png CT Test RB 6K RC 75R Oscop.png (19.9 KB, 307 views)
File Type: png CT Test RB 91K RC 1K zoom.png (17.7 KB, 303 views)
File Type: png CT Test RB 91K RC 1K Oscop.png (19.7 KB, 41 views)
File Type: png CT Test RB 500R RC 4R7 zoom.png (14.6 KB, 39 views)
File Type: png CT Test RB 500R RC 4R7 Oscop.png (19.9 KB, 37 views)

Last edited by styrkv; 31st March 2012 at 11:26 AM.
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Old 31st March 2012, 02:38 PM   #130
locky_z is offline locky_z  China
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Click the image to open in full size.
Your measure condition is 'VB 0.5 to 30V, 0.5V step. Constant VCE 30V. RB=6K Rc=75'


From the following diagram
Click the image to open in full size.

Vb from 0.5 to 30V, RB=6K,mean Ib is from 0 to (30-0.65)/6K=4.89mA,
if Hfe is 70,then Ic is from 0 to 342mA,
then the voltage drop at RC=75(Vrc) is 0 to 25.67V
because Vce+Vrc+5V must <= supply voltage, but your supply only 31V,
When Ic increases,Vrc increases, the Vce can not constabt at 30V.

you see this picture
Click the image to open in full size.
A start can be maintained in the 30V, but as the current increases, the increase of Vrc, Vce won't stay, you will see the Vc drop.



Click the image to open in full size.
the same RB=91K RC=1K,you can calcuate the Ib and Vrc drop range,




Click the image to open in full size.
RB=500 RC=4.55
trhis picture I don't know why
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