By the use of feedback amplifier techniques considerable improvement has been made in the speed and/or stability of the familiar electrometer tube micromicroammeter. Simplicity and compactness have been retained. With 100 feet of input cable, the amplifier has a 150-millisecond time constant at10 ¯11 amperes full scale with 0.05% per day stability.
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Dever et al. (1960) studied this question.