Norsonic 140 Manuel utilisateur

Norsonic 140 User Guide

Getting the Settings Right

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)

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.

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.

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

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)

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.

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