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???
11/20/13 08:02
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#190153 - cermet or wirewound
Responding to: ???'s previous message
Kai Klaas said:
decades ago Bourns has pubished a trimmer handbook in which they give an answer to your question: If the wiper maximum current rating isn't specified in the datasheet, the maximum current through the wiper is the same as what the trimmer element can handle at maximum power dissipation, provided it doesn't exceed 100mA.

I went out to Bourn's website and found http://www.bourns.com/data/glob...ndbook.pdf .
On page 68 (which in the pdf is page 227, the chapters are messed up), Bourns potentiometer handbook said:
100ma is a common wiper current rating for most wirewound and cermet type units.


That may be the explanation - the common, cheap carbon-element potetiometer such as TP160 I mentioned above might quite well have a very different wiper current rating.

One learns something new every day...

JW


List of 15 messages in thread
TopicAuthorDate
Power rating of potentiometers            01/01/70 00:00      
   Not the point            01/01/70 00:00      
      show me such            01/01/70 00:00      
         (was) incorrect            01/01/70 00:00      
            not your average "pot"            01/01/70 00:00      
         Specs that are not normally told..            01/01/70 00:00      
            power            01/01/70 00:00      
            test bench vs field design             01/01/70 00:00      
         That was kind of my point            01/01/70 00:00      
   pot limits            01/01/70 00:00      
      While I don't disagree ... there are different failure modes            01/01/70 00:00      
   Bourns says: "yes."            01/01/70 00:00      
      Tesla says: no            01/01/70 00:00      
      cermet or wirewound            01/01/70 00:00      
         No big difference, if it all            01/01/70 00:00      

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