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

Apparatus for performing a method for measurement value processing in a gas friction vacuum meter, in which the pressure value is determined by the drag on a magnetically suspended free ball, comprising forming a first time value t.sub.n-1 by measuring the time of N/2 periods of revolution of the ball and a second time value by directly following measurement of the time t.sub.n of additional N/2 periods of revolution of the ball, comparing the two time values to determine a pressure value, repeating this pressure value determination from two time values after each period of revolution for the same number of N periods of rotation of the ball to a total of Z determinations, and displaying the average of the Z-times-determined pressure value N:Z, being as at least one of 3:1, 4:1 and 5:1, the apparatus comprising:

• a magnetically suspended, rotating ball, a pickup coil associated with the ball, and
• circuit means for processing the signal induced in the pickup coil, including a computer, and measuring time preselector circuit means coupled to the computer.