Every time a recording is started, a new record is created in memory and filled until the recording is stopped. That record is time-stamped, so the signals can be displayed with respect to absolute date/time. Records are stored sequentially in the instrument’s memory. There is no limit to the number of records that the memory can contain, only a limit to the total size of the data recorded. The Noise_Sentry_RT_Manager application displays the total memory recording time as a function of the various setup parameters.

 

After (or while) recording, the records contained in memory can be downloaded from the instrument and observed or exported. In case a recording is ongoing the last record is only displayed up to the present time.

 

The recording is stopped automatically when the recording memory is full. This way a new record will not overwrite an old one.

 

The recording memory is non-volatile, so there is no risk of losing the data that has already been recorded, even in the case of a battery failure.

 

Note: It is perfectly legal to find empty records in memory. That occurs typically when a recording is started and stopped quickly, before any data had time to be written to memory. In that case only the time-stamp is written to memory.

An empty record can also occur when a recording was started but no data (Lmin, Lmax or Leq) was selected to be recorded.

 

To record sound levels proceed as follows:

1. Select the statistics to be recorded (L-min, L-max and/or Leq).

 

2. Select the log-interval. Note that the total recording time is automatically calculated and displayed by the Noise_Sentry_RT_Manager application, as a function of the log-interval and statistics selected. The log-interval is adjustable in 125 ms increments, from 125 ms up to 2H.

3. Select the time constant used to smooth the measured sound levels for L-min and L-max. Choose the Fast time constant (125 ms) to be able to detect short peaks and valleys. Choose the Long time constant (1 s) to provide cleaner more stable sound levels. Or adjust to another value, as required by the application

4. When ready to start a recording immediately simply press the Record button. Press Record again to stop the recording.

5. Or to set a start time/date:

• Check to make sure that the instrument time is correct. If that is not the case press the Sync button in order to automatically set the instrument time to the PC time.

• Press the Timer button. Set a start time and date using the calendar.

• Click OK to arm the trigger.