Sound Recording Option - BZ 7226

Sound Recording BZ 7226 is an option that works with all other software modules. In all cases it allows you to make recordings of the actual measured signal, that is, the microphone signal used for measurements (this must not be confused with recorded voice annotations, which uses the commentary microphone). However, its detailed working is dependent upon which other software module is enabled and running. In any case, recordings are automatically attached to the measurement and kept with it, even after transfer of the data to a PC.

The purpose of the Sound Recording Option is to let you record the measurement signal in order to identify and document sound sources, for example:

• The measured L_Aeq at 57 dB, did it actually stem from the rather distant compressor, or from other sources such as nearby birds or traffic? Not necessarily easy to evaluate on-site, very difficult to document convincingly later. If the signal is recorded: No  discussion
• Is it really true that this noise is impulsive and should be penalised accordingly? If the signal is recorded: There may still be an argument, but it is based on facts
• Exceedances were identified while no operator was present. Did they originate from the plant under investigation or from another source. If the signal is recorded: No discussion

With Sound Level Meter Software BZ 7222 and Frequency Analysis Software BZ 7223, the Sound Recording Option BZ 7226 basically lets you do the following:

• Record all or parts of the measured signal giving rise to specific results, levels and spectra
• Set up your instrument so that recording can be set to start automatically when the measurement is started, or you can initiate recordings manually

With Logging Software BZ 7224, additional options are available:

• Recording of sound can be associated with the Event Marker. Use the Event key or set an Event marker on the profile display: The sound during the event is recorded and attached to the appropriate part of the profile
• Automatic detection of events - based on level exceedance is also possible, meaning that recordings can also be initiated when no operator is present

In all of the above cases the maximum duration of recordings can be set (Type 2250 is only limited by available storage on the memory card currently in use). Recording sound obviously requires large amounts of storage, therefore Sound Recording Option BZ 7226 allows the user to decide on the trade-off between storage needed and recording quality (sampling rate).