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Related

Hey, Guys, I'm stumped It

phoenixcomm
phoenixcomm over 2 years ago

imageOk, it claims to be a 0.22Ω 3watt power sand resistor, with 3 legs. (so starting at the top and going clockwise, 1 at the top, 2 on the right, and 3 on the left)

My fluke 113 says no it's 0.38Ω between 1 and 2, as well as between 1 and 3, and 0.59/0.60Ω between 2 and 3. 

My HP3435A  set on the 20Ω scale says it's 0.37Ω between 1 and 2, and 0.38Ω between 1 and 3, and 0.59Ω/0.60Ω between 2 and 3.

Something is not right. 

and Please look at the logo, so I can figure out who made the stupid thing..

oh btw the wires go all the way through the body and are about 1" long on the reverse side. 

Thanks again. Cris

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  • jc2048
    jc2048 over 2 years ago +5
    As you've got two meters, perhaps just do your own four-wire measurement. Set a PSU to constant-current, use one of your meters to measure the current through the resistor, the other to measure the voltage…
  • beacon_dave
    beacon_dave over 2 years ago in reply to jc2048 +5
    Push pull amplifier designs appear to use them. Here is a Sony receiver design using a similar device. https://www.petervis.com/Amplifiers/sony-str-k740p/how-to-fix-sony-amplifier-protect-mode-error…
  • michaelkellett
    michaelkellett over 2 years ago +4
    Just guessing but: lets assume your leads have about .15 ohm resistance. then its a 0.22 R from 1 to 2, a second 0.22R from 1 to 3 (they both read about 0.37) so from 2 to 3 its 0.44R + the lead reistance…
  • michaelkellett
    michaelkellett over 2 years ago

    Just guessing but:

    lets assume your leads have about .15 ohm resistance.

    then its a 0.22 R from 1 to 2, a second 0.22R from 1 to 3 (they both read about 0.37) so from 2 to 3 its 0.44R + the lead reistance of 0.15 giving a readfing of 0.59.

    MK

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  • dougw
    dougw over 2 years ago

    If you short 2 and 3 do you get 0.22 ohms between 1 and the short?

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to michaelkellett

    Yes, 0.22 is tricky to measure.
    it isn't easy to measure these very low resistor values anywhere close to their real value with 2-wire meters. Even if you push hard on the contacts.

    "The measurement of very large or very small quantities is always difficult, and resistance measurement is no exception. Values above 1GΩ and values below 1Ω both present measurement problems."

    "When measuring larger resistance values this additional lead resistance error can be ignored, but as you can see from the chart below, the error becomes significantly higher as the measured value decreases, and totally inappropriate below 10Ω."

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  • Jan Cumps
    Jan Cumps over 2 years ago

     phoenixcomm , does it have pins at the other side too?

    (ah, saw in your post that you mentioned them)

    https://www.shutterstock.com/image-photo/cement-power-resistor-three-pins-on-1570576969

    image

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  • beacon_dave
    beacon_dave over 2 years ago
    phoenixcomm said:
    and Please look at the logo, so I can figure out who made the stupid thing..

    Looks similar to the old Pana Sonic 
    image

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  • Jan Cumps
    Jan Cumps over 2 years ago in reply to beacon_dave

    You seem to be spot on with the logo (source):

    image

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  • phoenixcomm
    phoenixcomm over 2 years ago in reply to beacon_dave

    Thank you dave

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  • dang74
    dang74 over 2 years ago in reply to dougw

    I was thinking the same except I would suggest shorting pin 1 to pin 2.  This would put the 0.38 OHM resistance in parallel with the 0.6 OHM resistance which of course is very close to the 0.22 OHM.

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  • rsjawale24
    rsjawale24 over 2 years ago

    Apologies for the bad drawing, I had to do it in MS paint without a stylus/pen.
    Assuming the connections are as shown below
    image

    R12 = R13 = 0.38 ohms
    And R23 = 0.6 ohms.
    However as per the specs, the entire resistor should be 0.22 ohms.
    As mentioned by dowg, if you short 2 and 3, the resistors will be in parallel and value would be 0.38/2 = 0.19 ohms. 

    R23 = 0.6 ohms also makes sense, as both resistors will be in series and so 0.38*2 = 0.76 which is close to 0.6 with not so precision DMM.
    Also, to measure such small resistance values, you would need precision ohmeter/DMM otherwise the lead resistances from the probes will not give you a correct reading.

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  • jc2048
    jc2048 over 2 years ago

    As you've got two meters, perhaps just do your own four-wire measurement.

    Set a PSU to constant-current, use one of your meters to measure the current through the resistor, the other to measure the voltage across the resistor, and work out the resistance from Ohm's law.

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