GRAS 42AA - Appendix; Appendix: Corrections for Static Ambient Pressure; Appendix: Corrections for Humidity

G.R.A.S. Sound & Vibration
Pistonphone Types 42AA/42AA-S1 - Page 17
A Appendix
A.1 Corrections for Static Ambient Pressure
Fig. A.1 shows the correction curve for ambient static-pressures over an extended range.
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 inuence of air humidity. The inuence of air humidity depends on both air
temperature and barometric pressure.
Fig. A.1 Corrections for static ambient pressure; the small rectangle
outlines the range covered by Fig. 2.2