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2. Sound level meter - Wikipedia

   en.wikipedia.org/wiki/Sound_level_meter

   A sound level meter (also called sound pressure level meter ( SPL )) is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The best type of microphone for sound level meters is the condenser microphone, which combines precision with stability and reliability. [ 1] The diaphragm of the microphone responds to ...

3. S meter - Wikipedia

   en.wikipedia.org/wiki/S_meter

   An S meter (signal strength meter) is an indicator often provided on communications receivers, such as amateur radio or shortwave broadcast receivers. The scale markings are derived from a system of reporting signal strength from S1 to S9 as part of the R-S-T system. The term S unit refers to the amount of signal strength required to move an S ...

4. Calibration - Wikipedia

   en.wikipedia.org/wiki/Calibration

   Calibration. In measurement technology and metrology, calibration is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy. Such a standard could be another measurement device of known accuracy, a device generating the quantity to be measured such as a voltage, a sound tone ...

5. A-weighting - Wikipedia

   en.wikipedia.org/wiki/A-weighting

   A graph of the A-, B-, C- and D-weightings across the frequency range 10 Hz – 20 kHz Video illustrating A-weighting by analyzing a sine sweep (contains audio). A-weighting is a form of frequency weighting and the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various national standards relating to the measurement of sound pressure level.

6. Noise dosimeter - Wikipedia

   en.wikipedia.org/wiki/Noise_dosimeter

   Personal noise dosimeters. A noise dosimeter (American English) or noise dosemeter (British English) is a specialized sound level meter intended specifically to measure the noise exposure of a person integrated over a period of time; usually to comply with Health and Safety regulations such as the Occupational Safety and Health (OSHA) 29 CFR 1910.95 Occupational Noise Exposure Standard or EU ...

7. Scientists May Have Found Signs of a Hidden Universe on the ...

   www.aol.com/scientists-may-found-signs-hidden...

   At about 3,500 meters (around 11,500 feet) deep in the Mediterranean Sea, the ARCA portion of the KM3NeT research rig experiences about 348 atmospheres of pressure. Compared with the one ...