Norsonic 140 Manuale utente
Norsonic 140 User Guide
Getting the Settings Right
1
Nor-140 - Front/Standby Screen Explained
Current Measurement Duration
Current Date
Current Time
Time Constant & Function
(Currently Fast Sound Pressure
Level). Adjusted using keys 8 for
Time Constant and 3 to change
display function
A-weighted and 2nd network
Weighted readings
Display Range Values. Adjusted
using inc & dec keys. Note this
Does not alter the measurement
Range
Graphical dB reading
Corrections Applied (G is pre-amp, W is windscreen)
2
Nor-140 Storing Methods
Automatic –Automatic saving, Repeat –Repeat measurement duration and save until stopped, Syncro –
Synchronise with the clock, Manual –Waits for Store/Record key to be
pressed before saving.
3
Nor-140 - Clock
Make sure ‘set clock’ is highlighted before pressing enter.
Nor-140 –Input & Corrections
For most assessments the input type should be standard with the Pol. Volts set to On. If very lowlevels are measuredon the
front screen then it is likely that the voltage to the microphone is turned off.
Active corrections are displayed by letters at the base of every screen. W is the windshield correction and G is the
preamp correction
Nor-140 –Outdoor Mic Corrections
Use ‘inc’ or ‘dec’ keys to cycle
through the input type settings.
Options in here depend on the
age of your 140
Pol Volt needs to be on for standard
free-field microphones to work
(Nor-1225). This is turned off for
Electret Mics
Horizontal/Vertical is the direction of sound
hitting the microphone. Typically Vertical is only
used for aircraft measurements where the source
is above the
microphone
Nor- 140 Measurement Durations
To move between boxes –type the number, press enter, use arrow keys to move to next box.
Resolution reduced using ‘inc’ and ‘dec’ keys.
7
Nor-140 L(t) Parameters
If you have option 7 on the Nor-140
you will see ‘A’ down the side,
otherwise it will be straight to the l
ast screen
8
Press button 5 to scroll between
weighting networks
(if you have the option)
For Noise Nuisance you only really need Leq. SPL is
required for BS4142. 1/3 Leq gives 1/3 octave
spectrums per second (or per resolution setting)
for tonal investigations
Nor-140 Frequency Mode
1/3 = 6.3Hz –20kHz
(standard microphone measurement capabilities)
1/3w = 0.4Hz –20kHz (for use with
accelerometer)
9
The latest version of the 140 can now show the Leq for
specific frequency ranges in the table view.
This does not affect the standard results
Nor-140 Measurement Trigger
Manual –Start key starts measurement, Clock (press 1 when highlighted) –measurement starts at specified
time and runs for measurement duration, External –Link to external control, Level Above –
(press 1 when highlighted) set dB level to exceed before measurement starts.
10
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