Quarter Bridge three lead strain gauge

Discussion in 'The Projects Forum' started by mikael.abdellah, Jan 21, 2013.

  1. mikael.abdellah

    Thread Starter New Member

    Jan 21, 2013
    I am tinkering with an idea...

    I would like to build a simple device for measuring very short short expansions in a metal object. A 12 bit resolution is enough and the only thing I need to see is the PEAK value.

    I want a strain gauge with a three wire connection to a wheatstone bridge connected to some kind of suitable instrumentation amplifier and the feed the signal to a fairly high speed ADC.

    I can't find any recommendations on resistor values for the bridge. The strain gauge is a 120 ohm manganin gauge.

    Any ideas how to choose the optimum resistor values and also how to extract the peak value from the signal???