Help with recognizing resistor decade

Discussion in 'Test & Measurement Forum' started by Gen-Radec, Nov 8, 2018.

  1. Gen-Radec

    Thread Starter New Member

    Nov 8, 2018
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    Hello, i stumbled upon an online "resistor decade", but I can't seem to recognize what it actually is. As you can see from the pictures there are 6 identical modules. Each has 2 sets of inputs labeled A and V so at first glance I thought they were supposed to be used for Kelvin 4 point measurements, but then I noticed the little switch that switches between them and that each decade is connected to either V or A labeled inputs.
    Has anyone seen a decade like this one? What it is used for? Thanks!

    20181108_152337_Gen-Radec.jpg

    20181108_163535_Gen-Radec.jpg

    20181108_152356_Gen-Radec.jpg
     
  2. ScottWang

    Moderator

    Aug 23, 2012
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    IS that possible the V is connecting to a voltmeter and the A is connecting to Ampere (Current) meter?
     
  3. Gen-Radec

    Thread Starter New Member

    Nov 8, 2018
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    Well, yes - at first i thought that they were terminals for 4 points measurement, but i couldn't see the logic behind the switch switching between them. My best bet was that it was a decade for callibrating temperature measurement systems because:
    1. It has all kind of quality check stamps in japanese over it so it must have been used somewhere that needs periodical qc and callibration
    2. The range of the decades themselves
    The bigger decade is rated either from 0 to 450 ohms or kohms and then a single 500kohm value or just from 0 to 500 kohms. The latter is an ordinary decade, but the first one seems , if memory serves me well, like a range of zero degree celsius thermocouple values. That would also tie to the values of the second decade which go from 0.1 ohms to 1 ohm in steps of 0.1 which seem like the temperature coefficient of a thermocouple per degree celsius. If so then the two decades should be connected in series and then a kelvin measurement using the A and V inputs would be the final piece, but then I noticed the damn switch which switches between them and my speculations went the way of the dodo :).

    Does any of the above seem plausible?
     
  4. ScottWang

    Moderator

    Aug 23, 2012
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    Can you make sure that does the inside has any other circuit or device except the resistors?
     
  5. Gen-Radec

    Thread Starter New Member

    Nov 8, 2018
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    No :(. The case is that i'm trying to figure out what exactly it is from the pictures before I buy it, hence the whole puzzle...
     
  6. ScottWang

    Moderator

    Aug 23, 2012
    6,373
    987
    If the meaning of V and A as explained in my posted #2 then the below is one kind of connection that I'm guessing.

    20181108_152337_Gen-Radec-explain.jpg
     
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