Campbell Norsonic 140 User manual

Norsonic 140 Set-up Guide & Features

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)

Screen Shots –Storing Method

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.

Screen Shots - Handswitch Light Activation

To make sure the handswitch light comes on go into 1) Instrument menu –2) IO/Print and then press button 1 for

the Dig IO ports. Make sure DO-1 is set to REC using the inc or dec keys at the top of the meter.

Screen Shots - Clock

Make sure ‘set clock’ is highlighted before pressing enter.

Screen Shots –2nd Network

Screen Shots –Input & Corrections

For most assessments the input type should be standard with the Pol. Volts set to On. If very low levels

are measured on 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. The preamp correction should

be the only one active unless using a random incident microphone or a different composition windscreen.

Screen Shots –Reference Tone

The reference tone is used to help calibrate the volume that audio recordings are played back in order

to create a ‘real life’ situation when listening. This is activated using the Cal button when a measurement is

taking place.

To activate the Ref. tone needs to be set to ‘On’ and the Type ‘Pink’. The gain value, if set to 0, starts at

118dB. Putting a minus in here therefore brings the playback level down from 118dB. So -48 gain gives a

playback volume of 70dB. The ‘Ex time’ is the period of time that this recording reference last for. The

frequency is only relevant if the Type is changed to Sine, otherwise it is a broadband recording.

Screen Shots –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.

Screen Shots –L(t) Parameters

1 = will be stored every second (can plot level vs time graph)

0 = will only appear in the global file

Press button 5 to scroll through

screens (there are 3 in the

advanced Lt option)

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