Gracey & Associates Hire

Norsonic 140 options

All Nor 140 analysers supplied by Gracey & Associates include options 1, 3, 4 and 6

Option 1

1/1-octave band filters - real time

Parallel 1/1-octave band, real time filters, 0.5 Hz - 16 kHz
All filters fulfill the IEC 61260 class 1 digital IIR base 10 requirements
120 dB 'one-range' in all filter bands
Graphical and numeric display
A-weightig [pre-weighting] feature available on displayed results
A limited frequency range 8 Hz - 16 kHz can be set in order to avoid low frequency noise and a 3 Hz third 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

1/3-octave band filters - real time

Parallel 1/3-octave band, real time filters, 0.4 Hz - 20 kHz in one span
All filters fulfill the IEC 61260 class 1 digital IIR base 10 requirements
120 dB 'one-range' in all filter bands
Graphical and numeric display
A-weightig [pre-weighting] feature available on displayed results
A limited frequency range 6.3 Hz - 20 kHz can be set in order to avoid low frequency noise and a 3 Hz third 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 4

Calculation of Ln statistical values

Calculates 7 fixed Ln values L1%, L5%, L10%, L50%, L90%, L95% and L99%
Parallel calculation of 1 editable Ln, selectable within the range 0.1% - 99.9%
Statistical calculations based on 0.2 dB class widths covering the entire 120 dB dynamic range
Parallel statistical calculations on both A and C/Z-weighted networks
Statistical values calculated for the individual filter bands as well - if the filter option(s) are installed
The statistical distribution calculations employs the F time constant and applies to the spectral weighting networks (A and C or Z) as well as all the individual 1/1- and 1/3-octave filter bands (if applicable).
The back-erase feature, which deletes the ten most recent seconds of acquired global data prior to a pause upon resuming, updates the statistics buffers as well to maintain consistency.

Option 6

Level versus time measurements

Measures the time 'Profile' (level vs. time) of the noise signal with preset time resolution simultaneously with the overall 'Global' measurement
Selection of preset intervals within the 1 second to 99 hours interval range
Automatic level versus time storage of LAeq, LAmax, and LCpeak or LZpeak
Automatic multi-spectrum storage of Leq and Lmax if option 1 is installed
Level versus time measurement continues during a paused Global measurement
Markers identify any pause, stop or continuation of a measurement
Real-time graphical and numeric display of the level versus time results
A pause marker is inserted into the time profile in pause mode
An overload marker is inserted if overload occurs

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