NOR118 Frequency Weightings and Measured Parameters

The parameters included with the NOR118-N1 are:

• SPL -- The Instantaneous Sound Pressure Level
• LMAX -- The Maximum Sound Pressure Level
• LMIN -- The Minimum Sound Pressure Level
• Leq -- The Integrated Equivalent Sound Pressure Level
• LE -- The Sound Exposure Level
• LPEAK -- The Maximum Peak Level

The frequency weighting functions A and C or Z are available for all functions including the LPEAK.

The Z-weighting replaces the older Lin or Flat as these have not been properly defined in any standard.

Fast, Slow and Impulse time constants are all available in the NOR118-N1 and there is an additional option available (NOR118-05) to measure these in parallel.

Statistical Parameters

The Statistical Parameters are included as standard in the NOR118-N1. There are eight percentiles available, out of which one is freely selectable. The class width is 0.2dB over the entire 120dB range.

The statistical distribution calculations employs the F time constant and applies to the spectral weighting networks (A and Z or C) as well as all the individual filter bands.

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