Norsonic 140 User manual

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

Nor-140 Level Trigger
To activate audio recordings without the handswitch you can use the level trigger option. This is in set-up 6) Trigger –
2) Record Trigger and then change the external to off (handswitch) and the level to on. Press button 1 with the Level
‘On’ highlighted to change the dB level. With this set the meter will record audio every time the noise goes above this
Threshold. Be careful when using this as manned properties will set the trigger off more often.
11

Nor-140 Recording Settings
12
Enter Max duration at the top. The other settings should be as above for best quality audio that can
be played on the average PC. In order to have the hamdswitch as a start/stop button
–set the duration to 0

Nor-140 Saving Settings & Recalling
When in the main standby screen press the Store/Record key and a set-up number will appear at the top of the
screen with a ‘S’ to indicate it has been saved. To load the set-up press the ‘Recall’ key and make sure the letters
In the top right say ‘INT’ for internal memory (SDC is SD card and you will need to press the inc or dec key to
change). Find the correct set-up number and press enter. The set-up number will then appear at the top of the
screen with the letter ‘R’ next to it to indicate it has been recalled.
13

Running Measurements
14

Nor-140 Button 1 - Table Functions
15
Button 1 displays table of
figures.
Button 1 again displays table
of percentiles.
Button 1 again returns you
to the main screen

Nor-140 Button 2 –Frequency Analysis
Button 1 displays table of
figures.
Button 1 again shows stats at
that highlighted frequency
Use cursor to select
frequency
16

Nor-140 Button 2 –NR Values
In the frequency screen –
scroll right to the bottom
NR and NC rating displayed at the end of the
measurement. This is in the latest version of
the 140 and due out next year on the 145s
and 150s
17

Nor-140 Button 3 –Function Display
Sound Pressure
Level Leq Max Min
18

Nor-140 Button 9 –A Pre-weighting Display
19

Single Axis Vibration & FFT Assessment
20