Norsonic nor118, Instruction Manual

Page: 35 / 116

22 Chapter 4
Simple sound measurements
23 Norsonic Nor118
User Guide
The percentiles table sequence
Your user-editable percentile can be set to anything
in the range 0.1–99.9 %, both extremes included. e
procedure is explained overleaf.
Data measured, but not yet stored may be subject to
changes in the user-defined percentile. is means that
as long as you have not stored the acquired data, you may
change the percentile as many times as you want, but
once the data are stored any changing of the user-editable
percentile is no longer possible.
Displaying the result table using the other
spectral weighting function
NETW
Spectral weighting network indicator
Units without statistics
Units equipped with statistics
e actual spectral weighting function used in the
table depends on the setting active before the  key
was pressed. At any rate, press  to toggle between
primary and secondary weighting function.
Statistics – displaying the percentiles
Instruments equipped with the optional extension 4
– statistics – will measure the statistics every time. is
cannot be switched off.
e sampling for the statistical calculations is made
with  time constant and the class width is 0.2 dB over
the entire 120 dB dynamic range – always!
You may think that storing all these data will require a
huge memory, and you’re absolutely right. erefore, we
refrain from that, we store just eight percentiles instead.
Seven of them are fixed and one is user-editable.