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Jan Waclawek
11/20/13 01:02
Read: 870 times
Bratislava
Slovakia


 
#190153 - cermet or wirewound
Responding to: Kai Klaas'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      Raghunathan      11/14/13 21:24      
   Not the point      Andy Neil      11/15/13 11:47      
      show me such        Jan Waclawek      11/16/13 13:48      
         (was) incorrect      Erik Malund      11/16/13 18:02      
            not your average "pot"      Andy Neil      11/17/13 07:40      
         Specs that are not normally told..      Raghunathan      11/17/13 03:37      
            power      Joseph Hebert      11/17/13 04:10      
            test bench vs field design       Jim Granville      11/17/13 12:13      
         That was kind of my point      Andy Neil      11/17/13 07:50      
   pot limits      Joseph Hebert      11/17/13 04:00      
      While I don't disagree ... there are different failure modes        Richard Erlacher      11/17/13 14:50      
   Bourns says: "yes."        Kai Klaas      11/18/13 16:08      
      Tesla says: no      Jan Waclawek      11/19/13 14:11      
      cermet or wirewound      Jan Waclawek      11/20/13 01:02      
         No big difference, if it all      Kai Klaas      11/23/13 06:10      

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