by Bernard Morris, John D. Yewin
Volume 2:5, Sep-Oct 1995
Since developing the world’s first automatic resistance bridge in 1966, Automatic Systems Laboratories (ASL), has spent over 25 years developing AC thermometry bridges for use in conjunction with platinum resistance thermometers. Automated AC bridges provide equivalent temperature measurement uncertainties in the range ±0.01 degrees C to ±0.0001 degrees C to cater to industrial applications and national standards applications. This paper describes the various sources of error associated with precision resistance thermometer measurement and provides a comparison to automated DC bridges and DC voltmeter techniques.
