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Old 12th February 2013, 09:23 PM   #201
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I got that part. Its understanding what I am reading on the screen that I am asking about.
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Old 12th February 2013, 09:30 PM   #202
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It will display a number from 1 to n.
You will need to look up your transistors spec to see what typical Hfe is.
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Old 12th February 2013, 09:32 PM   #203
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I just put a 2N4403 PNP transistor in the meter.
40V
600mA
625 mW

Shows 269 on the meter. What is that telling me?
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Old 12th February 2013, 09:35 PM   #204
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The DC gain of the transistor is 269.

Sounds good to me but check your transistor spec to be certain.
The spec usually has a range of possible values like 40-100.
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Old 12th February 2013, 09:39 PM   #205
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Default Nigel

Quote:
Originally Posted by nigelwright7557 View Post
It will display a number from 1 to n.
You will need to look up your transistors spec to see what typical Hfe is.
I am attaching the datasheet. Can you tell me how to read this so it makes sense to me?
Attached Files
File Type: pdf 2N4403_3.pdf (46.8 KB, 2 views)
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Old 12th February 2013, 09:46 PM   #206
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Quote:
Originally Posted by badraven View Post
I am attaching the datasheet. Can you tell me how to read this so it makes sense to me?
Look under DC current gain or Hfe.

269 looks good to me as the upper limit is 300.
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Old 12th February 2013, 09:51 PM   #207
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Look under DC current gain or Hfe.

269 looks good to me as the upper limit is 300.
So Current at the Collector of 150mA should produce 100 to 300 hfe, correct?
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Old 12th February 2013, 09:55 PM   #208
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Yes.
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Old 12th February 2013, 09:56 PM   #209
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Now if I were checking a transistor with the same specs as this transistor and I got a reading of say 310 or higher that could well be the problem or part of the problem.
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Old 12th February 2013, 10:01 PM   #210
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It would be unusual for it to be that high.

Usually if there is a problem you will get a low figure like 1 which probably means there is a short in the transistor.
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