Firmware | SoundAdvisor 831C Sound Level Meter
From Octave Band Analysis to Event Detection and Alerts
Reverberation time measurements are key to understanding the acoustic characteristics of a room and are also used to calculate absorption coefficients in materials testing. Typically, these measurements are dictated by international standards including ISO 3382-1, ISO 3382-2 and ASTM E2235-04. Optional firmware for SoundAdvisorTM Sound Level Meter Model 831C, 831C-RA measures sound level decays and computes reverberation time (RT60).
Option 831C-SR Recording Triggers
- Event History Sound Recordings – Automatically record the audio for an Event with a user-configured pre-trigger record time and recording length. Recording is time-synchronous with the Event.
- Measurement History Sound Recordings – Automated sound recording at the beginning of each Measurement History
- Manual Sound Recording – User-controlled recording duration, acquired during operation
- Marker-based Sound Recording – User-initiated with user-defined duration, acquired during operation
- Logic Input (Button) Recording – User-initiated recording with a button push or other logic level input. The 831C will record for a predetermined period of time.
When higher frequency resolution than 1/3 octaves is needed, FFT Frequency Analysis Model 831C-FFT is the ideal solution. The narrow-band filtering provided by Fast Fourier Transform (FFT) Analysis of single-channel acoustic or vibration sources is useful for machinery analysis, product development, tone detection, fault analysis, and vibration troubleshooting. Offering precision spectral analysis of signals, FTT acquisition settings can be adjusted to visualize specific acoustic and vibration phenomena. Using FFT on the handheld SoundAdvisor™ Sound Level Meter is a convenient way to achieve an objective measurement of tones or vibration phenomena in the field.
The Model 831C can be used to record the evolution of sound pressure level over time as a Time History (TH). The Time History is then used to profile the observation period, which can vary from several seconds to continuous monitoring.
With the addition of Time History Logging Firmware (831C-LOG), users can pre-select from logging periods as small as 20 ms to a full 24 hours. Parameter selections consist of familiar acoustic metrics as well as non-acoustic metrics, such as battery condition, outdoor microphone performance, and meteorological data (831C-WTHR).
- Connect a USB headset to the 831C and play from the meter
- Connect to the meter by G4 and play directly from the meter to the PC
- Connect to the meter by G4, download the file and then play the audio on the PC
- Connect to the meter using a browser and play the file directly from the meter through the browser
In many applications, it is important to acquire both the broadband level and spectral content of noise data. With spectral information, the source and content of the measured level can be better understood. Constant percentage bandwidth filters (1/1 or 1/3 octave) best approximate human perception of sound.
Option 831C-OB3 firmware enables simultaneous real-time measurement of 1/1 and 1/3 octave Leq, Lmax, Lmin along with all the ANY LEVEL™ broadband parameters. Option 831C-OB3 is compliant with IEC 61260:2014 Class 1 and ANSI S1.11-2014 Class 1 standards covering the entire frequency range of human hearing: 6.3 Hz to 20 kHz for 1/3 octave bands.
When 831C-OB3 is combined with Time History Logging (831C-LOG) or Automatic Event Detection and Event History (831C-ELA), it is possible to review the frequency content of logged data or specific events.
While Time Histories are typically logged at one sample per second, longer- term averages are often useful to see trends, e.g., 10 minute or hourly averages. 831C-ELA firmware enables Measurement History (MH) and logs these parameters similar to Time History (TH) over a longer interval time. MH and TH can run together simultaneously or independently.
Data for each measurement or location is saved in a unique MH record and may include the Leq, Lmax, Lmin, SPL, and statistical distribution of the SPL (Ln). A complete set of MH records then can be stored in a single measurement that keeps all the noise survey data in a single file. Finally, an automated sound recording at the beginning of each MH period can be achieved with 831C-SR firmware.
We understand how beneficial it can be to have access to your noise monitor at any time of the day. Due to the remoteness or need to setup contracts and get permits, connecting a noise monitor to a wired network or main power just isn’t feasible.
With option 831C-SW you can connect the SoundAdvisor by USB directly to a Sierra Wireless gateway and get a highly portable noise monitor that can easily be powered by battery and/or solar. We recommend the Sierra Wireless model RV-50 because of its low power usage and industrial design.
Data and alerts are often needed only on certain days or specific times. With 831C-SCH firmware, schedule run/stop times, modem usage, and alert type and recipient. Together with the optional event feature, 831C-ELA, trigger levels and alert recipient can be adjusted for time of day or day of the week. In conjunction with 831C-SW firmware, schedule power to the modem - conserve power when the modem is not needed.
With the graphical interface in G4 LD Utility software, easily configure SoundAdvisor to measure and report only what you need, even when those needs change.
In the Model 831C, events are defined as one of the following:
- Exceedance of a fixed threshold level for a minimum duration
- Exceedance of a dynamic threshold level for a minimum duration
- External trigger set by the digital input signal