Integrating fluxmeter with digital readout

A true integrating electronic fluxmeter with digital readout has been developed. It is a solid-state device, stable over a wide range of environments, and is free of zeroing and vibration problems. When measuring flux, using a search coil, the traditional integration ofN \phi = 10^{8} \int e dtis here performed by a voltage-to-frequency converter (VFC) which produces a series of output pulses, the number of which is proportional to\int e dt. These pulses are summed on a digital counter, and the indication thus obtained is a measure of the flux change. Calibration is readily performed by direct reference to the basic standards of the volt and the second, an important feature of this fluxmeter. This is in contrast to the generally used secondary standards of mutual inductance and current shunt millivolt drop. Enhancing this direct traceability is the constant digital readout, eliminating reading errors caused by a moving light beam. The basic accuracy of integration can be 0.15 percent or less.