G.R.A.S. Sound & Vibration
Pistonphone Types 42AA/42AA-S1 - Page 9
2.3.1 Barometer
The Pistonphone is delivered with a small barometer as a standard accessory for use when
applying static-pressure corrections.
• Type 42AA is delivered with barometer ZC0002K
• Type 42AA-S1 is delivered with barometer RA0168
Analogue Barometer ZC0002K (Fig. 2.3)
This barometer has the static-pressure corrections printed directly on its scale.
Digital Barometer RA0168 (Fig. 2.4)
This has an LCD which can display (via a toggle button) either the static-pressure correction
(e.g. – 0.13 dB) or the ambient static pressure (e.g. 997 hPa). It runs on standard 9 V battery
which can be accessed by removing the back plate which is held in place by four screws.
Fig. 2.3 Barometer ZC0002K Fig. 2.4 Barometer RA0168
Fig. 2.2 Corrections for static ambient pressure
On/Off switch
Toggle button
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