EMC test according to EN 62233

The European standard EN 62233 defines the admissible electromagnetic radiation of electrical equipment for use in the home and similar purposes. For this purpose, exacting guidelines with regard to the sensor and to signal conditioning are defined for the test. With the sensor ENB in connection with the measuring system UMS4, these measurements can be carried out easily and in a time-saving manner because signal conditioning and the necessary weighting of the frequency components that are found are carried out automatically and the measured result is displayed directly in percent of the limit value.

Magnetic field sensor ENB

The field sensor for an isotropic measuring of alternating magnetic fields is equipped with three coils arranged vertically to each other with a surface of 100 cm² each. Independently of the quality of the magnetic field to be examined, all frequency components in the signal in the range of 10 Hz to 400 k Hz are recorded and evaluated by means of a filter according to the standard. This transfer function renders knowledge of the signal form or the formerly applied FFT analysis superfluous.

The separation of sensor and display enables a particularly simple and ergonomic handling, while additionally available sensor slots on the UMS4 enable a simultaneous recording of up to twelve further measurable quantities. In that way, the room temperature or the air humidity can be additionally documented, for example, in the framework of an EMC measurement.

Multifunctional display

The 4-line LC display is particularly convenient: the ratio of total flux density to the admissible limit value is directly displayed as value in percent, while the simultaneous display of the X, Y and Z components facilitate the identification of the magnetic lines of force in space. Further guidance is provided by the display of an analog bar as well as of the maximum value, minimum value and mean value, while the integrated FFT analysis visualises the frequency spectrum in a range of up to 20 kHz.

Furthermore, a PC monitor can be used as a second, large-format display via the serial interface of the UMS4.

Additional functions

The threshold value for an acoustic alarm can be adjusted individually so that the different coupling coefficients of different device types can be taken into consideration.

The integrated data logger of UMS4 enables you to record the magnetic field exposition over time, for example during the heating-up phase of a device, and to document it via a PC. The analog output enables an external analysis of the signal form by means of an oscilloscope or a spectrum analyser.