- Parallel 1/3-octave real-time fi lters covering the 0.4 Hz - 20 kHz frequency range in one span
- All filters fulfil the IEC 61260 class 1 digital IIR base 10 and ANSI S1.11-2004 Class 1 requirements 120 dB “one-range” even in the filter bands
- Results are displayed both graphically and numerically
- A-weighting (pre-weighting) feature available on displayed results
When fitted with option 3, the Nor140 can perform real time frequency analysis in 1/3 octave covering the frequency bands 0.4 Hz to 20 kHz in one range. A limited frequency range covering 6.3 Hz - 20 kHz can be set to avoid low frequency noise. A 3 Hz 3rd order high pass filter is then enabled in the analogue input stage to prevent overload due to low frequency noise.
The wide frequency range with full dynamic range of more than 120 dB makes the instrument well suited for both vibration and noise measurements.
Option 3 requires that minimum option 1 be installed!
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1/3-octave spectrum |
1/3-octave spectrum |
1/3-octave |