Sensitive and simple integrator
J P Funk · Journal of Scientific Instruments · 1960
A sensitive and simple battery-operated current integrator is described. It uses as sensing element a standard millivoltmeter or microammeter, the pointer position of which is sampled at regular intervals by electromechanical means, the required movement of a feeler then being converted into rotation of a counter. The integrator accepts signals of varying polarity and also indicates the extreme signal level during any chosen period. It is particularly suited for the integration of quantities such as daily totals of net or global radiation.