BRUEL & KJAER 2245 - Default Chapter; Table of Contents

Sound Level Meter Types 2245 – Instruction Manual Page 2 of 110
Contents
Table of Contents
Chapter 1 Introduction ........................................................................................... 5
1.1 About This Manual ..................................................................................... 5
1.1.1 Conventions Used in this Manual .................................................... 5
1.2 System Overview ....................................................................................... 5
1.2.1 Hardware and Software on the Sound Level Meter ........................ 5
1.2.2 Basic PC Software ........................................................................... 5
1.2.3 Hardware Setup ............................................................................... 6
1.2.4 Block Diagrams ............................................................................... 8
Chapter 2 Short Guide to the Sound Level Meter ................................................. 9
2.1 Introduction ................................................................................................ 9
2.2 Switch sound level meter On/Off ............................................................... 9
2.3 Setting up the sound level meter ............................................................... 9
2.3.1 Measurement settings ................................................................... 10
2.3.2 Display settings ............................................................................. 13
2.3.3 System Settings ............................................................................. 13
2.3.4 Data explorer ................................................................................. 13
2.3.5 Calibration history .......................................................................... 14
2.3.6 Status ............................................................................................. 14
2.4 Calibration ................................................................................................ 15
2.4.1 Calibration Procedure .................................................................... 15
2.4.2 Calibration Check Procedure......................................................... 17
2.5 Measuring with the sound level meter ..................................................... 19
2.5.1 Start/Pause/Stop of Measurement ................................................ 19
2.5.2 Overload and Underrange ............................................................. 20
2.6 Looking at the measurement ................................................................... 20
2.7 Looking at saved measurements ............................................................. 21
2.8 Placing the Microphone (Sound Level Meter) ......................................... 23
2.9 Mounting the Sound Level Meter on a Tripod ......................................... 23
2.10 Measuring Low-level Sounds ................................................................... 23
2.11 Measuring at Low Static Pressure ........................................................... 24
2.12 Mechanical Vibration ............................................................................... 25
2.13 Frequency Weightings ............................................................................. 25
2.14 Measured Quantities ................................................................................ 27
2.14.1 Instantaneous Broadband Measurements .................................... 27
2.14.2 Timed Broadband Measurements ................................................. 29
2.14.3 Spectrum Measurements .............................................................. 34
2.14.4 Instantaneous Spectrum Measurements ....................................... 34
2.14.5 Timed Spectrum Measurements ................................................... 34
2.15 Overload and Underrange ....................................................................... 35
2.15.1 Overload ........................................................................................ 35
2.15.2 Underrange .................................................................................... 35
Chapter 3 Conformance Testing ......................................................................... 36
3.1 Introduction .............................................................................................. 36
3.2 Microphone, Accessories and Sound Fields ........................................... 36
3.2.1 For acoustical tests ........................................................................ 36
3.2.2 For electrical tests ......................................................................... 36
3.3 Calibration during Pattern evaluation and Periodic tests ......................... 36
3.3.1 Acoustic calibration ........................................................................ 36
3.3.2 Electrical Substitute for Microphones ............................................ 37