Symbols and definitions of the level meter instrument itself:
Ts Set integral measurement time
Tm Actual measurement experience time
Nm The actual number of samples for statistical analysis
GPS Global Positioning System
N: The name of the group or measurement point can be entered by the user.
H: The current time period number during 24-hour automatic monitoring
24-hour automatic monitoring mode
STA Single statistical analysis mode
F Time weighted fast mode with a time constant of 125ms
S Time weighted slow mode, with a time constant of 1000ms
I Time weighted pulse mode, with a rising edge time constant of 35ms and a falling edge time constant of 1500ms
The start time of the * * group during R @ 24-hour automatic monitoring
Lpx Sensitivity level of microphone
LAeq A weighted equivalent sound level
LCeq C weighted equivalent sound level
LZeq Z-weighted equivalent sound level
SEL Sound exposure level=Leq+10Log (T)
E Personal voice exposure, measured in Pa2h
Lmax maximum sound pressure level
Lmin minimum sound pressure level
L5 5% sound pressure level exceeds this sound pressure level
L10 10% sound pressure level exceeds this sound pressure level
50% of the sound pressure level of L50 exceeds this sound pressure level
90% of the sound pressure level in L90 exceeds this level
95% of the sound pressure level in L95 exceeds this level
SD Mean square deviation
