Electric pulses having a widely fluctuating rate to be measured are divided by a factor n ranging between 2 and 9, inclusive. A time base generator produces pulses having a constant rate defining a given period of time during which the measurement would normally be made if the rate of the electric pulses to measured were constant. The pulses from the time base generator are also divided by N having a value equal to the division factor of the electric pulses. A counter counts the number of electric pulses during the multiplied given period of time. The contents of the counter are then transferred to a digital readout device the reading of which is the average rate of the widely fluctuating rate measure during the multiplied give period of time. The given period of time is selected so that the readout device will present a direct visual reading in units of measure per unit of time, such as gallons per hour for a fluid. The rate fluctation of the electric pulses may be proportional to the rate fluctuation of a quantity being measured, such as fluid flow, fluid consumption or revolutions of an engine.
展开▼
