Real Time Octave and 1/3 Octave Band Filters

At the heart of the NOR118 is a powerful Digital Signal Processor, ensuring the instrument has more than enough power to analyze the noise in octave or 1/3 octave bands in real time.

		With real time or "parallel" filters, the instrument measures in all bands at the same time, speeding up the measurement processes and ensuring that no acoustic content is lost. Octave Bands: 8 Hz to 16 kHz 1/3 Octave Bands: 6.3 Hz to 20 kHz
Octave Band Spectrum	1/3 Octave Band Spectrum

In a single frequency analysis the NOR118 measures:

• 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

If your Nor118 is equipped with parallel time constants option the list of functions measured simultaneously can be expanded to include functions with F, S and I time constants at the same time.

The frequency bands measured are all visible in the display with no need for horizontal scrolling.

Furthermore, the instrument measures the full frequency range -- every time! Given the high dynamic range (120dB), which eliminates the need for adjusting the gain, there is very little to set up before a frequency analysis can be made -- successfully!

The measured functions are also available in tabulated form as numerical values. By pressing the TBL key before, during or after a measurement you have instant access to the numerical version. Another push on the key will restore the graphical display.

Frequency Band Statistics

Our standard offering, the NOR118-N1 can expand your frequency analysis to even calculate the statistical level distribution for each frequency band measured! In addition statistics will be calculated for the two spectral weighting networks employed (A- and C- or Z-weighting).

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