Procedure designed to operate an electromagnetic flowmeter which serves to measure the flow velocity or the volume flow of a medium in a measuring tube, wherein said electromagnetic flowmeter comprises: a measuring tube to conduct the medium; a magnet system comprising at least a coil system (21, 22) designed to generate a magnetic field in the medium, wherein the magnetic field is essentially perpendicular to a measuring tube axis, wherein the magnetic field is produced by applying an electrical voltage to the coil system (21, 22); at least a pair of measuring electrodes (31, 32) arranged in the measuring tube and designed to measure an electrode voltage induced in the medium by the magnetic field, wherein said electrode voltage is essentially proportional to the flow velocity and the intensity of the magnetic field; a measuring/operating circuit designed to operate the magnet system and to evaluate the electrode voltage; wherein the procedure comprises the following steps: Generation of the magnetic field during a feed phase, wherein the feed phase comprises a shot phase and a measuring phase, wherein a shot voltage (U Shot Z) is applied to the coil system (21, 22) during the shot phase, and wherein a measuring voltage (U Mess Z) is applied to the coil system (21, 22) during the measuring phase, wherein the value of the shot voltage is greater than the value of the measuring voltage, wherein the magnetic field is essentially constant, at least in sections, during the measuring phase, wherein a measured value of the electrode voltage is used during the measuring phase to calculate the flow of the medium; Measurement of a coil current which flows through the coil system (21, 22); Switching from the shot phase to the measuring phase as soon as the coil current reaches a limit value G; Measurement of an actual time duration (t Tat Z) from the start of the feed phase until the limit value is reached; Generation of the magnetic field during an xth consecutive feed phase, characterized in that a shot voltage (U Shot Z + X) of the xth consecutive feed phase is adapted depending on the actual time duration (t Tat Z) and a target time duration (t Soll) for the purpose of reducing a deviation of an actual time duration (t Tat Z + X) of the xth consecutive feed phase from the target time duration, where X is a natural number. a measuring tube to conduct the medium; a magnet system comprising at least a coil system (21, 22) designed to generate a magnetic field in the medium, wherein the magnetic field is essentially perpendicular to a measuring tube axis, wherein the magnetic field is produced by applying an electrical voltage to the coil system (21, 22); at least a pair of measuring electrodes (31, 32) arranged in the measuring tube and designed to measure an electrode voltage induced in the medium by the magnetic field, wherein said electrode voltage is essentially proportional to the flow velocity and the intensity of the magnetic field; a measuring/operating circuit designed to operate the magnet system and to evaluate the electrode voltage; wherein the procedure comprises the following steps: Generation of the magnetic field during a feed phase, wherein the feed phase comprises a shot phase and a measuring phase, wherein a shot voltage (U Shot Z) is applied to the coil system (21, 22) during the shot phase, and wherein a measuring voltage (U Mess Z) is applied to the coil system (21, 22) during the measuring phase, wherein the value of the shot voltage is greater than the value of the measuring voltage, wherein the magnetic field is essentially constant, at least in sections, during the measuring phase, wherein a measured value of the electrode voltage is used during the measuring phase to calculate the flow of the medium; Measurement of a coil current which flows through the coil system (21, 22); Switching from the shot phase to the measuring phase as soon as the coil current reaches a limit value G; Measurement of an actual time duration (t Tat Z) from the start of the feed phase until the limit value is reached; Generation of the magnetic field during an xth consecutive feed phase, Generation of the magnetic field during a feed phase, wherein the feed phase comprises a shot phase and a measuring phase, wherein a shot voltage (U Shot Z) is applied to the coil system (21, 22) during the shot phase, and wherein a measuring voltage (U Mess Z) is applied to the coil system (21, 22) during the measuring phase, wherein the value of the shot voltage is greater than the value of the measuring voltage, wherein the magnetic field is essentially constant, at least in sections, during the measuring phase, wherein a measured value of the electrode voltage is used during the measuring phase to calculate the flow of the medium; Measurement of a coil current which flows through the coil system (21, 22); Switching from the shot phase to the measuring phase as soon as the coil current reaches a limit value G; Measurement of an actual time duration (t Tat Z) from the start of the feed phase until the limit value is reached; Generation of the magnetic field during an xth consecutive feed phase, characterized in that a shot voltage (U Shot Z + X) of the xth consecutive feed phase is adapted depending on the actual time duration (t Tat Z) and a target time duration (t Soll) for the purpose of reducing a deviation of an actual time duration (t Tat Z + X) of the xth consecutive feed phase from the target time duration, where X is a natural number.