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Appendix B
Overload (OL)
An overload will occur whenever the input signal exceeds the dynamic range of the instrument.
Pascal (Pa)
Unit of pressure equal to 1 Newton per square meter.
Reference pressure
The sound pressure at the threshold of human hearing, as measured under standard conditions. This generally accepted magnitude of this pressure is 2 .00002 Pascals .
Response time (Fast “F”, Slow “S”)
Selectable time response settings used in the Sound Examiner measurements. The response time is a standardized exponential time weighting of the input signal according to fast (F) or slow (S) time response relationships. Time response can be described with a time constant. The time constants for fast and slow responses are 0.125 s, 1.0 s.
Relative response (dB)
Burst duration, t (seconds)
Figure B-2: Slow response to a tone burst
Sound Examiner
