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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