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Medical temp project (data logging)

Discussion in 'General Electronics Discussion' started by justinmg, Dec 26, 2012.

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  1. justinmg

    justinmg

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    Dec 26, 2012
    Greetings all this is my first post, so be gentle.
    I am a medical doctor, but moderately handy with a soldering iron and a computer.

    I have needed to measure temperatures accurately down to -60 deg C in, and have been using GE thermistors and a multimeter, and a pen and paper with good results. However I now need to measure in 8 spots once per second for 200 seconds. I`m guessing I need a USB data logger.
    I have found this:
    http://www.h-tronic.eu/product_info....html&XTCsid=4c48b1e2719cb2ef3cb7d23d7c5fc436

    Would this suffice, or are there any other suggestions?

    The next question is how to rig the thermistors. I`m guessing that they should be in series with a reference resistor between GND and a 4V rail, with the junction of thermistor and R1 being the analog V input.

    The other issue is the range of temps gives a range of thermistor resistances of 6K to 1M. How would the R be chosen. I`m guessing about 100K.

    Any comments or am I over looking something very obvious???!!!

    Thanks
     
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