Larson Davis 831 - Sections 5, 6, 7 and 9 (Except 9.3

Model 831 Manual Sections 5, 6, 7 and 9 (except 9.3) B-7
Section 9.3
a) Reference Sound Pressure Level
The reference sound pressure level is 114 dB re 20 µPa.
b) Reference Level Range
The reference level range is normal.
c) Microphone Reference Point
The microphone reference point is the center of the diaphragm of the 377B02 microphone.
d) Periodic Testing
Table 2 lists values of Larson Davis 831 with PRM831 and 377B02 Microphone adjustment data of A-
weighted levels used for periodic measurements.