MINISTRY QF AVIATION AERONAUTICAL RESEARCH COUNCIL CURRENT PAPERS An Amplitude Probability Analyser for Use in Turbulence and Noise Measurements

A circuit is described for the measurement of the cumulative amplitude probability distribution of electrical signals. Details are given of the use of the apparatus in noise and aerodynamic turbulence measurements. The input level is 0.6 volts peak-to-peak (100 mV R.M.S. with a Gaussian probability distribution), and the frequency response is approximately 10 c/s to 70 kc/s. The output signal is obtained as a train of 3 volt negative-going pulses which are integrated on a galvanometer.