Method for the processing of measurement data in a gas friction

Details Method for the processing of measurement data in a gas friction Method for the processing of measurement data in a gas friction

1984-12-11

1987-02-03

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Electrical

G01L 900

Patent

active

046401369

ABSTRACT:
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.

REFERENCES:
Reich, Vakuum-Technik, vol. 31, No. 6, 6-1982, pp. 172-178.

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