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Old 30th April 2013, 03:07 PM   #791
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..and here is the link to ebay:

Locky Z's Intelligent Curve Tracer | eBay
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Old 30th April 2013, 03:10 PM   #792
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I use this one :
Peak Electronic Design Limited - Atlas DCA Pro - Advanced Semiconductor Analyser - Model DCA75
It is pretty cool. You can not use it for power transistors but for low level transistors it is all you need.
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Old 30th April 2013, 03:24 PM   #793
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yeah it looks pretty cool....but currently out of stock!!!!!!

Which one you think is better? they are both good enough?
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Old 30th April 2013, 03:25 PM   #794
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I do not know the chinese one.
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Old 30th April 2013, 03:27 PM   #795
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found it on amazon

Amazon.com: Atlas Dca75 Pro Advanced Semiconductor Analyzer: Everything Else
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Old 30th April 2013, 03:36 PM   #796
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Just FIY the chinese curve tracer can do up to 2.5A and if power supply is enhanced can get up to 5A.

Beolow is quoted from the post


Mainly for the following reasons:
1.The the maximum output voltage is only 36V(It limited by the op amp).
2.My initial design, the maximum measuring current of 5A, and each PCB actually can work in 5A current.
3.Most of the transistor Hfe-Ic curve is under Vce = 5 or 10V.So the maximum voltage on RC is 25V, So RC = 5 ohms is best.The my early have used 6.8 ohm / 4.7 ohm.I'm here with 4.55 ohm reasons is more I have 9.1 ohm resistor.




The PCB compent can work in 5A,But why I set them only work under 2.5A?
Because the HP switch power supply only can output 2.5A, If exceeded, the power will be shut down. you need to restart the power it.
So I produced, select R48 and R50, so that the protection circuit of each PCB around at 2.5A effect.
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Old 30th April 2013, 03:38 PM   #797
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OK, so it can measure up to higher voltage and current then the Peak Atlas.
Maybe you can buy it and try it out.
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Old 30th April 2013, 03:46 PM   #798
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thst is what I was thinking about!!

I think I will buy it!!
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Old 30th April 2013, 03:50 PM   #799
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Stefano,

the 75 model has more, e.g. measures JFET Vpinch-off and transconductance, plus has a USB connector to store data on a PC.
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Old 30th April 2013, 03:55 PM   #800
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well but so does the other.
I haven't dug into that in detail, but it looks like you can store and recall and compare curves, am I wrong?

The problem with the 75 is that you can only put 5mA, so if for instance I want to match BJTs on my design which are working at 12mA, I would be unable to do so.

Am I missing something?
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