Method for the processing of measurement data in a gas friction vacuum meter and a gas friction vacuum meter equipped with a circuit for the practice of this method

摘要

A method for the processing of values measured in a gas friction vacuum meter, in which the pressure is determined by the drag on a magnetically suspended free ball, by forming a first time value t.sub.n- 1 by measuring the time required for N/2 periods of revolution of the ball, and a second time value t.sub.n by the immediately following measurement of the time required for another N/2 periods of revolution of the ball, determining a pressure value by comparing the two times values, repeating this pressure value determination of two time values after each period of rotation for the same number N of periods of revolution of the ball to a total of z determinations, and displaying the average of the pressure value determined Z times. To be able to determine the pressure with optimum measurement times and uncertainties of measurement, the ratio of N to Z is selected at approximately 4:1.