In a method for monitoring a measurement system having a transmitter which determines the position of a moveable element and has a transmitter clock, and an electrical energy store which, in the event of a failure of an external electrical supply voltage for the transmitter, continues to supply electrical power to at least a part of the transmitter, including the transmitter clock. After the external electrical supply voltage has been restored, the clock time of the transmitter clock is compared with a clock time of an external clock, and an incorrectly determined position is identified on the basis of the comparison of the clock times.