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The Pistonphone operates at a frequency of 250Hz.
Specifies the nominal calibration levels (114 dB re. 20 μPa and 105.4 dBA) at reference conditions.
Explains the reciprocating pistons and cam disc mechanism that generates the acoustic signal.
Discusses how coupler and microphone volumes affect sound pressure level and require correction.
Details how ambient static pressure affects the nominal sound pressure level and provides a correction formula.
Provides instructions for safely shipping and transporting the Pistonphone, including battery removal.
Details the type of batteries used and procedures for installation, replacement, and removal.
Guides the user through the process of calibrating different microphone sizes with the Pistonphone.
Explains how to calculate microphone sensitivity using measured output voltage and sound pressure level.
Shows a correction curve for ambient static pressures over an extended range, referencing Figure 2.2.
Explains the necessity of correcting for air humidity in precise calibrations and provides relevant figures.
General| Brand | GRAS |
|---|---|
| Model | 42AA |
| Category | Test Equipment |
| Language | English |
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