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Old 20th February 2012, 12:44 AM   #11
locky_z is offline locky_z  China
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Out Box LED is Overcurrent protection indicator,It always not bright.
The Power LED indicator inside Box.


You can use some wire connect slot X Y Z,and power on, and you will hear 8~9 relay voice,this mean the MCU is OK.and the communication rate will auto set to 28800bps.
And then you run software, press 'Autodetec'


the .pre extension file is save the 'Measurement conditions' file,you can use notepad to open.
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Old 20th February 2012, 12:49 AM   #12
ljm_ljm is offline ljm_ljm  China
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Very good.I have many acquaintances in the use of your design tester.
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Old 20th February 2012, 05:39 AM   #13
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Thread moved to vendors bazaar due to commercial interests.
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Old 21st February 2012, 03:23 PM   #14
pchw is offline pchw  United States
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Taoboa said 此宝贝已下架, do you have another link that I can use to buy?
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Old 21st February 2012, 03:29 PM   #15
locky_z is offline locky_z  China
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Lazybutt had already bought them all from taobao.
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Old 21st February 2012, 03:49 PM   #16
pchw is offline pchw  United States
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Thanks, I thought I could ask my friend to buy a complete unit for me instead of waiting for the GB :-)
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Old 21st February 2012, 06:51 PM   #17
mos57 is offline mos57  Italy
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Locky, i am not able to view the output curves of my 2sa970 transistor under test, but i view only singles point as this image
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File Type: jpg curve tr_screen.JPG (101.6 KB, 365 views)
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Old 22nd February 2012, 01:02 AM   #18
locky_z is offline locky_z  China
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1.You use RB=500ohm ? It could make Ib too large,and lead to Vce too small,and measure process will termination.

Click the image to open in full size.
If you understand this measurement schematic, you will understand that the choice of the RB the RC and Vb range

Generally small single transistor measure is using RB=1360K or RB=91K and RC=1K.


another you check DTU pin.
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File Type: png 11.PNG (3.0 KB, 1944 views)

Last edited by locky_z; 22nd February 2012 at 01:06 AM.
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Old 22nd February 2012, 02:27 AM   #19
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Will the software permit the acquisition and then later comparison of a number of curves, each of a different device under test?

What would happen if a user was to add an external DC amplifier )x10 ?) to increase the range of the collector voltage and then scale the measurement resistor to suit? (Vc)

Do you have over voltage protection on the measurement ("input") terminals so that things will not burn out in the event of excess voltage being present?

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Last edited by bear; 22nd February 2012 at 02:34 AM.
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Old 22nd February 2012, 03:58 AM   #20
locky_z is offline locky_z  China
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Because the resistor in different device maybe not match,so the result is different device may different,but the different is tiny.
Example measure hfe, in a device is hfe=100,but in another device maybe hfe=101.5, Because their The divider resistor and current sampling resistor may be not exactly the same.


The intelligent Curve Tracer not suitable for high voltage measure, and hard to increase range.


There are no over voltage protection,because the device not know what DTU is measuring,
It just follow your setting measurement conditions and the output voltage(max is 36V)

It had only the hardware of overcurrent protection.It only protect the Curve Tracer,can't protect the DTU.
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