Specifications

B-field Exposure From Induction Cooking Appliances 22
from those two measurements. As given in the specifications, the cut-off frequencies for the
Narda probe ELT-400 are around 30 Hz and 400 kHz, and the frequency response is flat between
those frequencies; the error is smaller than ±0.8 dB. The error in [dB] was calculated using the
Equation (6):
Error[dB] = 20 log(B/B
average
) (6)
Figure 15: Spherical isotropy of the Narda probe ELT-400. The probe was attached to the
DASY4 robot arm and centered in the Helmholtz coil. A waveform generator (Agilent 33120A)
applied a sinusoidal voltage (frequency 20 kHz) to the Helmholtz coil. The B-field values were
recorded while rotating the probe around its z-axis. Error in [dB] of the B-field measured
when applying in the coil a) 1 V
pp
, top measurement, b) 1 V
pp
, side measurement, d) 10 V
pp
,
top measurement, and b) 10 V
pp
, side measurement; e) diagram of top measurement and side
measurement; f) measurement setup of the spherical isotropy of the Narda probe.