The NA-28 Reverberation Time Macro enables the measurement of T20 and T30 using the Rion NA-28 to collect the data and Excel™ to calculate the reverberation time from the data downloaded either via the memory card or the instrument's USB interface.

The Macro is available to NA-28 users free of charge and is a quick, convenient and inexpensive way of measuring reverberation times in octave and/or octave bands simultaneously. The calculations are based on the least squares method.

The Macro is typically used with 5msec sampling which gives a 10 second measurement time (the Macro is based upon the analysis of 2000 samples). The NA-28 will sample down to 1 msec samples.

The Rion NX-28BA Building Acoustics Option offers a more flexible range or RT time measurement options and gives the user the opportunity to view the results (including the decay curves) on the meter’s superb colour display.

The NA-28 Reverberation Time Macro:-

• Quickly calculates T20 and T30 times from NA-28 data in Excel™
• Sheets showing both results and raw data produced in a workbook
• Allows the quick calculation of RT times using the NA-28 at no extra cost

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