dBchecker:
"…Sound pressure shall be measured with sound level meter meeting ANSI S1.4a, Specifications for Sound Level Meters,
Type 2 Requirements. Levels throughout the protected area shall be measured and recorded…"
NFPA 72 Chapter 10 (10.4.2.2 (15) )
G1.1 The sound level meter shall have a measurement range that permits readings as low as 35dBA and shall be calibrated
immediately before and after the audibility measurements are taken. The use of a quality meter is important to minimize any measurement errors.
ANSO s1.40, Specifications for Acoustical Calibrators, is one standard that can provide guidance on the subject.
CAN/ULC-S537-04 G1.1
