Measurement and evaluation of pulsating environmental magnetic fields by the example of resistance welding installations

Resulting from the connection between the change rate of a magnetic field and the induced currents in an exposed human body, pulsating magnetic fields have to be evaluated analyzing the waveforms of the field or the field-generating current. Considering the specific output current waveforms of resistance welding installations in the paper appropriate procedures to determine the waveform-dependent exposure limits are explained by the example of a resistance welding inverter. Based on investigations of the field distribution the actual flux density values are compared to the ascertained exposure limits.