a method of measurement using an electrical device, as a Wheatstone bridge, in which the quantity to be measured is balanced by an opposing known quantity that is varied until the resultant of the two is zero. Found on https://www.infoplease.com/dictionary/null-method
a method of measurement using an electrical device, as a Wheatstone bridge, in which the quantity to be measured is balanced by an opposing known quantity that is varied until the resultant of the two is zero.