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How to subtract 10 ohms from a 200 ohm resistive load?

Discussion in 'General Electronics Discussion' started by HLOW, Mar 12, 2017.

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  1. HLOW

    HLOW

    12
    0
    Jan 24, 2013
    I'm try to calibrate an auxiliary automotive cooling water temp gauge. When I submerse the sensor in boiling water the gauge reads about 90C... The sensor reads about 210 ohms (at 100C). I would like it to be about 200 ohms so the gauge reads correctly. I realize the low end will not be perfectly accurate but I'm not concerned with that.
    Thanks for any insight!!!
    ...
     
  2. Bluejets

    Bluejets

    5,131
    1,071
    Oct 5, 2014
    Op amp or a uC using the map function.
     
  3. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    You can put a resistor in parallel
    1/A + 1/B = 1/C
    so
    1/210 + 1/D = 1/200
    or
    1/D = 1/200 - 1/210
    resistor D = 4200
    Chose a resistor of the nearest preferred value say 3k9Ω or 4k7Ω
     
    CDRIVE, HLOW and davenn like this.
  4. HLOW

    HLOW

    12
    0
    Jan 24, 2013
    THANK YOU!!!
     
  5. AnalogKid

    AnalogKid

    2,538
    722
    Jun 10, 2015
    or 4.22 K at 1%.

    ak
     
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