Norsonic nor140, Instructional Manual, Page: 6 / 220

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Contents
Chapter 3 Calibrating the instrument ........................................................................................... 16
When to calibrate ..............................................................................................................................16
No need to adjust the full scale setting .............................................................................................16
Carrying out the calibration ...............................................................................................................16
Chapter 4 Simple sound measurements ......................................................................................20
Setting the duration .......................................................................................................................... 20
Statistics ............................................................................................................................................21
Instruments with time profile installed .............................................................................................. 22
Setting the time constant .................................................................................................................. 22
Instruments with multiple time constants ......................................................................................... 22
Multiple time constants and statistics .............................................................................................. 22
C or Z as spectral weighting network ............................................................................................... 22
Making a measurement .................................................................................................................... 23
Resuming an ended measurement ...................................................................................................24
The back-erase function ....................................................................................................................24
Displaying the functions measured ...................................................................................................24
Displaying the result tables .............................................................................................................. 25
Statistics – displaying the percentiles .............................................................................................. 26
Displaying the percentiles table ....................................................................................................... 27
Storing the acquired data ................................................................................................................. 27
Printing out the results ...................................................................................................................... 27
User defined table ............................................................................................................................ 28
Chapter 5 Frequency analysis .......................................................................................................29
Setting the measurement duration ................................................................................................... 29
Statistics ........................................................................................................................................... 30
Instruments with time profile installed .............................................................................................. 30
Consider setting the time constant .................................................................................................. 30
Setting C or Z as spectral weighting network .................................................................................. 30
Finding the energy level over a part of the frequency range ............................................................31
Activating the frequency mode .........................................................................................................31
Switching to displaying the spectrum .............................................................................................. 32
Making a frequency analysis ........................................................................................................... 32
Resuming an ended measurement .................................................................................................. 33
The back-erase function ................................................................................................................... 33
Displaying the functions measured .................................................................................................. 34