... measurement parameters Lp (sound level), Leq (equivalent continuous A sound), Lmax (maximum sound level), LN (percent ... of all readings over alarm value set) * Permits 'A', 'C', or 'Flat' weighting choices and Slow ... Lmax, LN. * Measurement range: * Lp: 30~130dB (A), 35~130dB (C), 40~130dB (F) * Leq: 30-130dB ... : 20.0 to 12, 500Hz * Frequency weighting: A, C and F (Flat) * Built-in calibration signals ...