A Wheatstone Bridge for the Computer Age
Les Huntley · 1992
Guildline’s 9975 Current Comparator Resistance Bridge [3, 4] provides excellent accuracy for values smaller than 10 kilohm, but is a manual instrument which requires a skilled operator. (Another system for making automated measurements of resistance in this range is presented at this conference [5].) Furthermore, while it excels in the measurement of low-valued resistors, its performance degrades rapidly at values above about 100 kilohm. Instruments for measuring high valued resistors automatically and with the desired accuracy were not available at the time this effort was undertaken. This paper describes a modification of the familiar Wheatstone bridge circuit which has the desired qualities.