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Old 8th November 2012, 02:46 PM   #71
ilardi is offline ilardi  United States
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Again big Thanks. In fact my power supply was at just a little over 34 volts. As I learn to use the instrument, I have just been using the default settings, including the 35V load condition. Resetting Vc to 34 allowed me to get a normal (many points) measurement.

This leads to another question, however, for anyone who can explain this to me. Is it normal for the measured Hfe to vary so much using the fixed versus no fix condition? For an old PNP small signal Darlington I get about 300 for the fixed condition versus about 500 for the unfixed condition (which coincidentally corresponds to a static DC measurement I made with a DMM).

I am looking forward to Version 3.5 of the software.
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Old 9th November 2012, 01:45 AM   #72
locky_z is offline locky_z  China
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Darlington hfe change is very big, this is the true facts.

You can goto
CurveTracer : Locky_z's Curve Tracer
and download V3.5(2012.8.12)
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Old 17th November 2012, 04:56 PM   #73
ilardi is offline ilardi  United States
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Default Power Supply for CT3

I found a power supply for the CT3 that I like and that seems to work well-36V/4.2 A. Price was good (cheaper than what it would have cost me to build an equivalent linear supply). 36V 4.2A Single Output Power Supply

Noise is a little high compared to the linear supply I had wired up (see the scope photo-settings 50 mV/div and 5uS per div) but I think the frequency of the noise is high enough that it doesn't much matter-which brings me to my question-does it matter? It would be relatively simple to clean it up, but I am not so sure that the effort is warranted. Comments from the experts would be much appreciated.

Thanks.
Attached Images
File Type: jpg IMG_0477.jpg (1,000.2 KB, 323 views)
File Type: jpg IMG_0475.jpg (374.7 KB, 207 views)
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Old 18th November 2012, 12:44 AM   #74
locky_z is offline locky_z  China
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This switching power supply no problem.
I compared the linear power supply and switching power supply, there is no difference.
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Old 1st January 2013, 01:39 PM   #75
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LockyZ,
I was testing some mosfets today and got a pop and now LED over current light is on. Any ideas. I don't want to have to go this thing bit by bit.
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Old 2nd January 2013, 12:38 AM   #76
locky_z is offline locky_z  China
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Quote:
Originally Posted by buzzforb View Post
LockyZ,
I was testing some mosfets today and got a pop and now LED over current light is on. Any ideas. I don't want to have to go this thing bit by bit.
"got a pop" mean you hear a 'pop' sound? or a popup a window?

The protect circuit as below:
Click the image to open in full size.
Vcc is power supply input,and output to C/E channel amplifier(Vcc2).

If C/E channel amp have something wrong, or PMOS fail, the over current LED will light.

1.You can measure the voltage of Vcc2 (Vcc2 is Q2 Q3 collector), It is equal to power supply.
2.If Vcc2 is not equal power supply, then Q1~Q4 have some wrong.
3.If Vcc2 is OK, then use a 1K resistor connect Vcc2 and GND and measure the Vcc2 voltage. Normaly Vcc2 voltage drop is small. If PMOS is fail, the Vcc2 vlotage drop down a lot.
4.If Vcc2 is OK, but over current LED still light, then may be Q7 error.


You can check whether Q1-Q4 is short.
or use a 1K resistor connect Vcc2 and GND and measure the Vcc2 voltage. If PMOS is fail, the vlotage of Vcc2 is
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Old 2nd January 2013, 01:20 AM   #77
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Thank you. It has been a pleasure to use.
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Old 5th January 2013, 03:09 PM   #78
mos57 is online now mos57  Italy
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Locky, what means when all curves arises towards a point as in these graphics as for 2SK1058 and 2N6661 ?
Attached Files
File Type: pdf CURVE_2SK1058.pdf (59.9 KB, 27 views)
File Type: pdf CURVE_2N6661.pdf (53.1 KB, 16 views)
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Old 6th January 2013, 12:19 AM   #79
locky_z is offline locky_z  China
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Just by these graphics is not easy to see what happens.
Best given your save file (. Cuv), and your measure condition and the power supply voltage.
By these file, I can either reproduce graphics, and data can be analyzed.
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Old 7th January 2013, 06:43 PM   #80
mos57 is online now mos57  Italy
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Below the .CUV files for N-DMOS, (OUTPUT CURVES) ID vs. VDS for mosfets 2N6661 and 2SK135 (this is like 2SK1058). VDS Voltage was 36V
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File Type: zip 2N6661.zip (24.7 KB, 4 views)
File Type: zip 2SK135.zip (15.7 KB, 6 views)
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