NTi Audio Minilyzer ML1 - Manual (Page 43)

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Calibration
An induction loop receiver transforms a magnetic field strength to an
electrical level. The receiver sensitivity is specified within the technical
data. Before a valid measurement can be started the ML1 sensitivity
setting must be adjusted accordingly.
Fig 4.3 Calibration Panel
filters
The ML1 has a built-in A-weighting and a HP400 (high pass 400Hz)
filter, which may be activated using the filter menu. For detailed test
requirements please refer to the IEC 60118 standard. The HP400 filter
has an excellent rejection of mains frequencies, which sometimes is a
dominant part of the signal received by the induction loop receiver.
Fig 4.4 SInduction Loop Filters
Induction Loop Mode