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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 overall level can be better understood. Constant percentage bandwidth filters (1/1 or 1/3 octave) best approximate human perception to sound. 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. 831-OB3 is compliant with IEC 61260:2001 Class 1 and ANSI S1.11-2004 Class 1 standards and covers 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.
View Octave Band data live on-meter, in G4 LD Utility Software, or the LD Atlas app.
With optional Time History firmware (831C-LOG), G4 LD Utility Software displays results graphically. View octave band levels over time as a heat map.
| 831C-OB3 Specifications | |
|---|---|
| Octave Analysis Parameters | |
| 1/1 Octave Filters | 8 Hz to 16 kHz |
| 1/3 Octave Filters | 6.3 Hz to 20 kHz |
| Filters | None, 1/1 octave, 1/3 octave, or 1/1 and 1/3 octaves |
| Frequency Weighting | A, C, or Z (independent of broadband weighting) |
| Maximum Spectrum | Maximum in each band or Spectrum at broadband Lmax |
| Spectral Statistics | 6 percentiles per filter |
| Octave Band Logging Capability | Time History (see 831C-LOG)
Measurement History (see 831C-ELA) Event History (see 831C-ELA) |
| Octave Filter Standards | |
| IEC61260 Ed. 2.0 (2014) Class 1 | |
| ANSI S1.11-2014 Class 1 | |
| Normalized Spectrum | |
| View Modes | SPL, Leq, Lmax, or Lmin; absolute or relative |
| Predefined Filters | A, C, -A, -C |
| User Defined Filters | 4 named for 1/1 Octave and 4 for 1/3 Octave bands |