Sound Level Meters
What is a Sound Level Alert?
The Extech Sound Level Alert show readings of sound level on a very large LCD perfect for viewing from a distance. Sound level is displayed in decibels as well as represented by LEDs that are bright, and color-coded status. The user could program a sound level limit that’ll change the LEDs to flashing red from green and have an ‘OVER’ message displayed when exceeded.
How are Sound Level Alerts used?
The Sound Level Alert can be set in class-rooms, hospital wards, auditoriums, and other areas in school.Once the noise level gets to an alarm level that’s predetermined, the alert LEDs will relay occupants a warning. The relay output allows users to connect a visual device or external audio for alerts that are more dramatic, and customized.
What’s a Sound Level Datalogger?
The HD600 Datalogging Sound Level Meter stores, displays, and measures data of sound level measurement. Up to 20,000 readings can be stored in the meter, each with the date and also time stamp. Readings on the meter’s display could be recalled or downloaded to a PC. Included software permits the user to view, graph, print, and export data to a spreadsheet.
How are Sound Level Dataloggers used?
Because a Sound Level Datalogger can store readings automatically at a user-programmable sample rate, they’re the tools ideal for taking ‘unattended’ readings for extended periods of time. After readings are stored, they can be transferred to a PC to be printed, graphed, viewed, or exported to a spreadsheet to conduct analysis even further. This capability can be applied to many applications such as airport environmental impact studies, concert venues, traffic intersections, construction zone monitoring, noise analysis, and many others.
What is ‘A’ and ‘C’ Frequency Weighting?
Selections of frequency “weighting” enable users to choose how the meter would treat sound measurements over the specified frequency range of the meter. In ‘A’ weighting mode, the meter provides more “weight” to specific frequencies. Simply put, sound levels at particular frequencies will be cut or boosted (to match how the ear of humans responds to sound). “A” weighting’s suitable for OSHA compliance testing. The “C” weighting selection gives a “flatter” response, meaning that all frequencies are basically treated the same (no cutting or boosting of sound level). “C” weighting is ideal for machine diagnostics and analysis.
What is the significance of FAST / SLOW Response Time?
Selections of Response Time refer to how slow or fast the meter will respond to sound. Most meters have a slow and a fast selection. Often, a “slow” response is mostly used for hearing OSHA programs/conservation and is an “averaging” of sound level over time. “Fast” response is often utilized for product noise reduction efforts and could detect quick noise bursts (For instance: fireworks).
Source: Extech Instruments