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Old 21st March 2013, 01:19 AM   #351
locky_z is offline locky_z  China
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The minimum resolution of the voltage of the tracers is probably about 2 mV.

If your current is less than 10mA, then the best choice for RC = 1K, Because the voltage drop on the RC can reach 10V.If you choose RC = 4.55ohm,the voltage drop on the RC only 50mV. Measure 50mV error is far greater than 10V.

So I suggest when you want to measure some transistor.
First: The collect current determines the range of the RC, How to determines the RC range? As much as possible the voltage drop on RC exceeds 0.5V.
Secondly: Assume the transistor hfe is 100, and calculate the base current, and base on the base current determines the range of RB,As much as possible the voltage drop on RB exceeds 0.5V.
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Old 25th March 2013, 03:45 PM   #352
rephil is offline rephil  Europe
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Hi Locky_z

I am interested in getting one of your nice intelligent curve tracer in eBay.

What kind of computer have I to have here in order to run the software that you provide ? Does it run on Windows XP and Windows X7 ? Sorry for so a stupid question, but I prefer to ask before buying it.

Thank you for your answer.

Best regards

rephil
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Old 25th March 2013, 04:19 PM   #353
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Quote:
Originally Posted by AmpliFire View Post
Hi locky,

Thanks for the reply. yes, I could (should) have figured that myself . I tried many different settings and got very bad curves, but now I got the feeling of tuning and it all works fine. See new curves attached.

Finally I can start testing to find new modern transistors which are close to old transistors in 70's amplifiers. The curve below is just playing, but the example search is to find modern substitutes for the 2SC1212A (driver transistors for a 1975 Kenwood amp). The Japanese transistor manual (2009) says 2SC3421, and of course the good old 22D669 comes to mind (or BD137/139). The 2SC3421 comes in Y and O ranking (I got Y rank), hence I can now check if the O ranking (lower Hfe) is the one to get. The 2SD699 is not as good, and comes in so many different ranks, as this test shows (AC rank = crap, or I got counterfeits ?).

Super tracer !

And the 2SC3421 seems to be a VERY linear device.... very interesting....
Dunno abt the 2sc3421 but how did you get the text and labels on the graphs ? Mine is a rats nest and I'm dyin to figure how to label the individual traces on the graph ....
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Old 25th March 2013, 06:50 PM   #354
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You can label them after tracing or redefine the labeling parameters before testing.
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Old 26th March 2013, 01:09 AM   #355
locky_z is offline locky_z  China
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Quote:
Originally Posted by rephil View Post
Hi Locky_z

I am interested in getting one of your nice intelligent curve tracer in eBay.

What kind of computer have I to have here in order to run the software that you provide ? Does it run on Windows XP and Windows X7 ?
rephil
I have test it under winxp 32bit / Win7 32bit /Win2008 64 bit server, They run all well.
But someone say the USB drivers(PL2303 chips) under win8 is not compatible.But someone say use the pl2303 drivers Version 1.5.8 or more earlier is OK.
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Old 26th March 2013, 01:16 AM   #356
locky_z is offline locky_z  China
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Quote:
Originally Posted by kasey197 View Post
Dunno abt the 2sc3421 but how did you get the text and labels on the graphs ? Mine is a rats nest and I'm dyin to figure how to label the individual traces on the graph ....
The figure show how to display the axis-label.

But the curve label can not display,You can move the mouse over the curve, the curve name will display on status bar.
Attached Images
File Type: png a1.PNG (12.2 KB, 231 views)
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Old 26th March 2013, 08:05 AM   #357
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Quote:
Originally Posted by kasey197 View Post
Dunno abt the 2sc3421 but how did you get the text and labels on the graphs ? Mine is a rats nest and I'm dyin to figure how to label the individual traces on the graph ....
Simple.... copy graphic to clipboard, paste in MS Visio, add text boxes (rotate and format text as required), select all and copy to clipboard (CTRL-A and CTRL-C), then paste in IrfanView (or similar graphic viewer) and safe it as JPG file.
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Old 26th March 2013, 08:08 AM   #358
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Quote:
Originally Posted by locky_z View Post
I have test it under winxp 32bit / Win7 32bit /Win2008 64 bit server, They run all well.
But someone say the USB drivers(PL2303 chips) under win8 is not compatible.But someone say use the pl2303 drivers Version 1.5.8 or more earlier is OK.

I confirm mine is working under Win7 64 bit, but I do get an occasional error message (1 out 25 times) that the COM link is not working when I hit the 'GO' button, but clicking 'GO' again solves that problem. Seems like a timing/synchronisation problem on the comm link, not an issue with the comm driver/protocol
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Old 26th March 2013, 08:11 AM   #359
rephil is offline rephil  Europe
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Hi locky_z,

Thank you for your answer. In eBay you have one more order .

Best regards

rephil
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Old 26th March 2013, 08:48 AM   #360
rephil is offline rephil  Europe
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Quote:
Originally Posted by AmpliFire View Post
I confirm mine is working under Win7 64 bit, but I do get an occasional error message (1 out 25 times) that the COM link is not working when I hit the 'GO' button, but clicking 'GO' again solves that problem. Seems like a timing/synchronisation problem on the comm link, not an issue with the comm driver/protocol
Thank you for this help Amplifire as I have the Win 7 64 bit too and also the Win XP 32 bit on a slow, old and tired computer that is going away.

Best regards

rephil
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