Patent ID: 6801874
Filing Date: 2004-10-05
Classification: G01D

Abstract:
A method for the start-up of a position measuring device comprising a scanning unit, the method comprising:switching on a position measuring device that comprises a scanning unit; subsequent to said switching on, performing a check of a supply voltage of said scanning unit supplied by a voltage source, wherein said performing said check comprises: measuring a supply voltage of said scanning unit for a first time; providing a defined load with a voltage; and calculating an internal resistance of said voltage source; and activating one or more electrical components in said scanning unit, provided a sufficient supply voltage for said activating has been determined during said performing said check; and measuring a second supply voltage of said scanning unit at a second time, wherein said calculating said internal resistance is based on said supply voltage of said scanning unit measured at said first time, said second supply voltage and a current consumption of said defined load.