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Old 28th July 2014, 01:18 AM   #451
locky_z is offline locky_z  China
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Oscillation may occur on DUT,
FET when you need to stay away from the circuit board, GATE is generally recommended series with a resistor in order to suppress oscillations.
The tracer B channel output pass through RB/ two relay to socket B.May be DUT oscillation.

Try connect a 100ohm resistor to the Gate and connect to B socket.
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Old 28th July 2014, 07:19 AM   #452
generg is offline generg  Germany
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I had the same experience it seems the two connecting boards are in a way different and "parallel", are they Locky.....?

:-)
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Old 28th July 2014, 07:22 AM   #453
generg is offline generg  Germany
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Sorry I read your answer too late....:-)
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Old 1st August 2014, 04:50 PM   #454
cwtim01 is online now cwtim01  Hong Kong
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Quote:
Originally Posted by locky_z View Post
...Try connect a 100ohm resistor to the Gate and connect to B socket.
Thanks Locky, a gate stopper does solve the issue.

As I'm using a 40V/5A switching power supply, I have replaced the 2 LM358s with LT1013, and the curves become smoother afterwards. If I want to be able to measure current of up to 4A, what value of R50 would you recommend?
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Old 1st August 2014, 05:27 PM   #455
cwtim01 is online now cwtim01  Hong Kong
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Default 2SK82 curve

The tracer is capable of measuring depletion mode device like SIT, nice
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File Type: jpg 2SK82.jpg (333.7 KB, 74 views)
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Old 2nd August 2014, 07:13 AM   #456
locky_z is offline locky_z  China
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Quote:
Originally Posted by cwtim01 View Post
If I want to be able to measure current of up to 4A, what value of R50 would you recommend?
I'm not solder the 'protect sw' switch button. you can install these switch button.
When you want measure current more than 2.5A, you can hold down the switch button and begin measure.

This button temporary disable the over-current protect circuit.
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