ISO 3741 - specifies precision methods for determining the sound power level of a noise source from sound pressure levels measured in a reverberation test room (a room designed to create a diffuse or random incidence sound field). C 1 and C 2 also stay zero, because the outside temperature is around 23☌ and the altitude of the test site is below 500 meters sea level. \( L_ \) = meteorological correctionįor example, if we have a free-field measurement, and the microphones are aligned in a sphere, then L p is the sound pressure level measured by 10 microphones, the surface S is 4πr 2, the background noise K 1 is the noise emitted from the machinery around the sphere, and there is no K 2 because we have free-field. The following equation shows us how to calculate the Sound Pressure level (Lp) in decibels from sound pressure (p) in Pascal. The standard reference sound pressure in the air or other gases is 20 µPa, which is usually considered the threshold of human hearing (at 1 kHz). It is measured in decibels (dB) above a standard reference level. Sound pressure level (SPL) or sound level is a logarithmic measure of the effective sound pressure of a sound relative to a reference value. The SI unit for sound pressure p is the pascal (symbol: Pa). Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave. In air the sound pressure can be measured using a microphone, and in water with a hydrophone. Image 1: Sound is a pressure wave - a vibration that propagates as a mechanical wave of pressure and displacement Structural Health Monitoring and Condition Monitoring of Wind TURBINES Structural Health Monitoring of Bridgesįor Buildings, Bridges, Dams, and Stadiums.Modal Testing and Modal Analysis.Static and Dynamic Balancing of Rotating Machines.Octave Analysis for Predictive Maintenance and Monitoring.Rotational and Torsional Vibration Analysis.With Orbit Plot For Machine Health Condition Assessment Railway Power Analysis and Power System Testing.Wind Power Quality and Wind Turbine Testing.High-precision Power Quality Analyzer and Meter.Electrical Equipment and Lighting Testing.Standby Power and Power Consumption Testing.Electric Motor Testing and Inverter Testing.FFT Spectrum Analyzer and Frequency Analyzer.Class 1 Sound Level Meter and Noise Measurement.Brake Noise Testing - Brake Squeal Analysis.Internal Combustion Engine Measurement, Analysis and Thermodynamics.Acoustic Calibration Services (IEC/ANSI)įor Thermocouple and RTD Temperature Recordingįor Voltage and High-Voltage Data Recording. Accelerometers, TACHOS, AND Angle Sensorsįor EtherCAT Data Acquisition and Control Systems.High-speed Video Cameras For Video Data Acquisition Inertial Navigation Systems (INS and IMU) Tools and API's for Developers and Automation Supported Input and Output Data Interfaces.Low-Noise Triaxial MEMS Accelerometer and Inclinometer Small, Rugged, IP67 Data Logger and PROCESSING Computerĭata Acquisition System With Real-time EtherCAT BusĮTHERCAT Data Acquisition and Real-Time Control SystemĮmbedded Data Acquisition System AND DATA LOGGERĭistributed Industrial Data Acquisition Systems High-channel-Count Data Acquisition SystemĨ-Channel UNIVERSAL Data Acquisition System
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