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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…
Parents
  • 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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  • phoenixcomm
    phoenixcomm over 2 years ago in reply to rsjawale24

    Yes, correct drawing. but go between 1 and 3+2. I end up with 0.27Ω this was done on my HP 3435A on the 20Ω scale this is a true 4-digit meter.  I have a call in to PANASONIC I will let you know how this works out in the end..

    I want to give a big shout-out to everyone that gave me their 2 cents, mostly great stuff. Thanks again, Crazy Cris. 

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  • phoenixcomm
    phoenixcomm over 2 years ago in reply to rsjawale24

    Yes, correct drawing. but go between 1 and 3+2. I end up with 0.27Ω this was done on my HP 3435A on the 20Ω scale this is a true 4-digit meter.  I have a call in to PANASONIC I will let you know how this works out in the end..

    I want to give a big shout-out to everyone that gave me their 2 cents, mostly great stuff. Thanks again, Crazy Cris. 

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