Coustic 401SE User Manual download pdf (Page 43)

Appendix B

Sound Examiner SE-400 Series

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.

Figure B-2: Slow response to a tone burst

Burst duration, t (seconds)

Relative response (dB

)

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 120 121

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Coustic 401SE User Manual Page 43