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Fender FM212R Problems
Fender FM212R Problems
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Old 12th February 2013, 09:23 PM   #201
badraven is offline badraven  United States
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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
nigelwright7557 is offline nigelwright7557  United Kingdom
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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
nigelwright7557 is offline nigelwright7557  United Kingdom
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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
badraven is offline badraven  United States
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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, 4 views)
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Old 12th February 2013, 09:46 PM   #206
nigelwright7557 is offline nigelwright7557  United Kingdom
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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
badraven is offline badraven  United States
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Quote:
Originally Posted by nigelwright7557 View Post
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
nigelwright7557 is offline nigelwright7557  United Kingdom
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Yes.
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Old 12th February 2013, 09:56 PM   #209
badraven is offline badraven  United States
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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
nigelwright7557 is offline nigelwright7557  United Kingdom
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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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