Precision Temp. Sensor LM34

Discussion in 'General Electronics Chat' started by superway, Mar 4, 2011.

  1. superway

    Thread Starter Active Member

    Oct 19, 2009
    128
    0
    Hi,

    Could you help me to verify testing the temp sensor LM34?
    I applied a 9vdc to +Vs and GND, and measure between Vo pin and GND, I just got 0.7 vdc out, I don't think it is right. I am looking the output is about 2.9vdc equal to 25degC.

    Thanks

    Ken
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Keep in mind that the LM34 is calibrated for Fahrenheit.
    The LM35 is calibrated for Celcius.
    See the datasheets.

    Bertus
     
  3. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    The data sheet says you'll get 10 mV per deg F. Therefore your measured temperature was 700 mV/(10 mV/degF) or 70 deg F. Sounds reasonable.
     
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