A New Balanced Electrometer Circuit

Abstract

An electrometer circuit is described in which it is possible to choose the resistances such that the plate voltage is independent of the supply voltage. When the circuit is used as the input stage of a direct‐coupled amplifier, this leads to a simplification of the amplifier design. The equations determining the circuit constants in terms of the electrometer parameters are derived and applied to a G.E. Type FP‐54 electrometer tube. The possibility of obtaining a higher order of balance is briefly discussed.