Monitoring a disturbing variable of a measuring device system by monitoring an error velocity of the measuring device system

Abstract

The method comprises producing a measurement signal (s) having a signal parameter, followed with a temporal change (Δx/Δt; Δx'/Δt) of a primary measured variable (x) and a temporal change (Δy/Δt) of a disturbing variable (Δ), and producing a measurement signal (s) having a signal parameter, followed by a temporal change (Δx/Δt; Δx′/Δt) of a primary measured variable (x). The method comprises ascertaining measured values (X) of first type representing the primary measured variable (x) or a secondary measured variable (f(x) Δx′) of measured values (X) of second type representing the primary measured variable (x) or a secondary measured variable (f(x) Δx′). The method comprises using measured values (X) of first type and measured values (X) of second type for ascertaining an error characterizing number (Err) representing a velocity error (ΔX/ΔX) caused by a change of the disturbing variable (y).