Abstract: A test device for a modular magnetic-inductive flowmeter is disclosed. The test device allows for a dry functional test which does not require measurement of a current through a coil of the modular magnetic-inductive flowmeter. The test device includes a test controller and a test measuring module for a measuring module receptacle of the modular magnetic-inductive flowmeter. The test measuring module has a holder with a magnetic field sensor. The test controller stores at least one setpoint value of at least one variable of the magnetic field. The test controller is designed to measure at least one actual value of the at least one magnitude of the magnetic field using the magnetic field sensor when the test measuring module is inserted into the measuring module receptacle and to determine a deviation of the at least one actual value from the at least one setpoint value and to display the deviation.

Abstract: A field device (1) having a switching converter circuit (2) and a measuring circuit (3) for determining at least one measuring variable. The switching converter circuit (2) is supplied with electric power on the input side and the switching converter circuit (2) is connected to the measuring circuit (3) on the output side and the switching converter circuit (2) supplies the measuring circuit (3) with electric power. The problems associated with changing interfering signals due to the switching converter circuit are reduced in that a load circuit (5) is actuated by a load control circuit (6) so that the output-side electric load at the switching converter circuit (2) does not fall below a minimum electric load.

Abstract: A field device (1) having a switching converter circuit (2) and a measuring circuit (3) for determining at least one measuring variable. The switching converter circuit (2) is supplied with electric power on the input side and the switching converter circuit (2) is connected to the measuring circuit (3) on the output side and the switching converter circuit (2) supplies the measuring circuit (3) with electric power. The problems associated with changing interfering signals due to the switching converter circuit are reduced in that a load circuit (5) is actuated by a load control circuit (6) so that the output-side electric load at the switching converter circuit (2) does not fall below a minimum electric load.