NTi Audio Minilyzer ML1 - Manual (Page 42)

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Induction loop Measurement Menu
The Minilyzer restarts with an specific new AFILS measurement
menu including
• Level, fast weighted
• Level, slow weighting
• Level, PPM
• THD+N
• F-Sweep, frequency sweep
• 1/3rd oct. spectrum analyzer
• Scope
• Calibrate
Fig 4.2 Induction Loop Menu
Units mA/m, dBL
The magnetic field strength is measured in A/m (Ampere per meter).
AFIL systems use 400mA/m as a reference level. The logarithmic unit
of the magnetic field strength is dBL (dB Loop) and has a reference
level of 400mA/m.
Magn. field strength
400mA/m
dBL 1 = 20 * log
1 The designator of the unit dBL is not standardized jet - but resulted
of IEC 60118 committee members recommendations.
Measurement Functions