G.R.A.S. Sound & Vibration
Pistonphone Types 42AA/42AA-S1 - Page 18
WEEE directive:
2002/96/EC
CE marking directive:
93/68/EEC
Manufactured to conform with:
RoHS directive:
2002/95/EC
Fig. A.2 Corrections for humidity at different temperatures
A.2 Corrections for Humidity
For highly-precise calibrations in accordance with IEC Standard 942 Class 0, it will be neces-
sary to correct for the inuence of air humidity. The inuence of air humidity depends on both
air temperature and barometric pressure.
∆L
H
= ⋅ C - 0.0064 dB
P
r
P
a
(9)
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