inverter: at a low frequency range, the disturbances are reduced
by 5–10 dB; but at the battery’s main resonance (3 MHz), the
disturbance voltage peaks and superposes the disturbances according
to CISPR 25 by ∼10 dB. This peak is followed by a
disturbance minimum, where the voltage emissions are up to
33 dB (at 6.3 MHz) lower than measured with LISNs. Above
40 MHz, the disturbance voltages are below the noise floor due
to the operational amplifiers used. Because the load impedances
of both cases are identical above∼40 MHz, the conducted emissions
in this frequency range are equal.