In Germany for example the regulation BGV B11 has to be applied. The safe operation of demagnetizers requires the observance of exposure limits!. Workplaces must be checked for compliance with the regulations of the employers’ liability insurance associations BGV B The measurements or calculations. Health and Safety Regulation on electromagnetic fields (EMFV); The health and safety requirements of the employers’ liability insurance association BGV B

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Schmid G, Hirtl R. A value one-third that of the torso is apparently applied as the geometric dimensions of the limbs. The ratio of EI max to EI noise is called the dynamic range of the measurement system. 1b1 of electronic and electrical equipment related to human exposure restrictions for electromagnetic fields 0 Hz— GHz. Support Center Support Center.

The reference levels vgv the maximum permissible RMS root of mean of squares value for time stationary and sinusoidal-shaped field quantities at each frequency.

Electromagnetic environmental compatibility

Alternatively, the exposure index could be determined separately for the three individual components and the RSS value from these three partial results considered as the overall result. By using our services, you agree to our use of cookies. The disadvantages of competing methods are demonstrated. Indirectly, via the frequency domain: The same W f is used.


With the exception of this potential overestimation, it is possible to specify a very simple and exact model for the relationship between the external field quantity g t and the stimulation effect. The parameter k in eqn 8 represents a coupling factor. B1 magnitude of this transfer function approximates the reciprocal of. The peak value of the weighted time signal s t is determined in a second step.

That this averaging effect is sufficiently taken into account in the progression of reference levels above 3 kHz and for short times is also completely overlooked. This would result in additional large over- or underestimations depending on the point in time and sign of the field changes.

The problem here is that the areas of g t that lead to the maximum EI are often not readily identifiable. The weighting filter convolves the field quantity g t with an impulse response w twhere w t is the inverse Fourier transform of W f: Limiting V to V max is b11 by an alleged but otherwise unexplained safety risk with very short pulses.

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To some degree, the effect of the DC bgb is based on completely different physical or biological effects than for the AC components. The phase can therefore be calculated from the magnitude: It is therefore neither necessary nor sensible to evaluate both effects with a single method or to somehow add their effects together.

This factor lies between unity and V max and depends on the crest factor of the bv. However, this is only true if there are significant pauses between the signal segments bgg field quantity changes are present. Noise and vibration protection. It actually already reacts before the stimulating step occurs. However, there is no justification for this underestimation based on physical or biological grounds. In particular, WPM in the time domain can be used without a second thought.


The permissible field quantity swing they specify for very short impulses is too high by a factor of 2, however. Nevertheless, it does make the effect of V max quite clear and shows what BGM does in principle, as well as how BGM could be expanded to cover any field characteristic mathematically exactly and unambiguously.

These effects are therefore discussed later after the various assessment methods have been presented. Thermal and moisture protection. If the magnitude of W f exactly emulates the sharp edges of R fthere are three obvious variants to configure the phase of W f: The reference levels R f are generally stated as magnitudes in the form of a table. It cannot be applied outside its limited scope of definition anyway without unavoidably vulnerable assumptions and interpretations made by the users.

The author declares no conflicts of interest.