Instruction manual
page v
Introduction 1
General Features 3
Quicker instrument switch-off 3
Save a new default set-up 3
SMS command for date and time 3
0 dB reference selection 4
Improved modem connections 4
New weather station connection 4
Environmental mode 5
Pre-weighting of spectra 5
Noise criterions (NC, NR, RC) 6
Marker for external DC failure 8
Reference tone on recordings 8
Pure tone mode 9
Improved possibilities 9
Pre-set pure tone Standards 9
Building acoustic mode 10
Spectrum Adaptation Terms 10
Equalizer 11
General 11
Equalizer implementation characteristics 11
Using EQ with the pink noise excitation - a cookbook 12
Using EQ with the Swept-Sine excitation - a cookbook 12
Swept-Sine measurement technique 13
Building Acoustics measurements
using Swept-Sine technique 14
Introduction - What is Swept-Sine technique? 14
Benefits of using Swept-Sine 15
Principles behind the method 16
Implementation in Nor121 18
Excitation signal 18
Measurement of IRs - deconvolution 19
Setting up for Swept-Sine measurement 20
Level Setup 22
Reverberation setup 24
Rating and BGN setup 24
Correction setup 24
Making Measurements with Swept-Sine 25
Level in channel 2 and SNR display 25
What does the measured BGN and SNR mean? 27
What does the “?” displayed with level values mean? 27
Measurement of high sound insulation values 29
Technical specifications 30
Bandwidth = 1/3 Octaves 30
Bandwidth = 1/1 Octaves 30
Broadband impulse response
measurements using Swept-Sine 31
Implementation 31
Making IR Measurements - a cookbook 31
Transferring measured IR from the Instrument to a PC 32
Technical specifications 32
Contents
