B&K 2250 Light Manual do Utilizador Página 4
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Table of Contents
CHAPTER 1
Introduction.......................................................................................................................................... 1
1.1 About This Manual..................................................................................................................................... 1
1.2 System Overview....................................................................................................................................... 2
1.3 Hardware Setup......................................................................................................................................... 3
CHAPTER 2
Measured Quantities and Parameters ............................................................................................... 7
2.1 Introduction................................................................................................................................................ 7
2.2 Measuring Low-level Sounds .................................................................................................................... 7
2.3 Measuring at Low Static Pressure............................................................................................................. 8
2.4 Frequency Weightings............................................................................................................................... 8
2.5 Measured Quantities ................................................................................................................................. 8
CHAPTER 3
Conformance Testing........................................................................................................................ 15
3.1 Introduction.............................................................................................................................................. 15
3.2 Mounting for Acoustical Tests ................................................................................................................. 15
3.3 Mounting for Mechanical Vibrations Tests............................................................................................... 15
3.4 Electrical Substitute for Microphones ...................................................................................................... 15
3.5 Testing 1/1-octave-band and 1/3-octave-band Filters ............................................................................. 16
3.6 EMC test procedures............................................................................................................................... 16
CHAPTER 4
Specifications .................................................................................................................................... 19
4.1 Specifications .......................................................................................................................................... 19
4.2 Standards ................................................................................................................................................ 19
4.3 Reference Environmental Conditions ...................................................................................................... 19
4.4 Reference Conditions for Acoustic Calibration ........................................................................................ 20
4.5 Microphone.............................................................................................................................................. 20
4.6 Frequency Response .............................................................................................................................. 20
4.7 Directional Response .............................................................................................................................. 26
4.8 Self-generated Noise............................................................................................................................... 39
4.9 Measuring Range .................................................................................................................................... 41
4.10 Detectors ................................................................................................................................................. 43
4.11 Spectrum Analysis................................................................................................................................... 45
4.12 Influence from the Operating Environment.............................................................................................. 47
4.13 Electrical Input to Connector Panel of Type 2250 ................................................................................... 49
4.14 Electrical Output from Type 2250............................................................................................................ 49
4.15 Power Supply .......................................................................................................................................... 50
4.16 Warm-up Time......................................................................................................................................... 50
4.17 Real-time Clock ....................................................................................................................................... 50
4.18 CE-mark and C-Tick mark Compliance ................................................................................................... 51
APPENDIX A
Tables ................................................................................................................................................. 53
A.1 Electrical Frequency Responses ............................................................................................................ 53
A.2 Free-field Frequency Responses ............................................................................................................ 55
A.3 Diffuse-field Frequency Responses......................................................................................................... 62
A.4 Directional Responses............................................................................................................................. 66
BE171211.book Page iii Thursday, May 27, 2004 1:01 PM
- Technical 1
- Documentation 1
- Hand-held Analyzer Type 2250 2
- Safety Considerations 3
- Table of Contents 4
- Chapter 1 6
- 1.2 System Overview 7
- 1.3 Hardware Setup 8
- CHAPTER 1 10
- Chapter 2 12
- 2.4 Frequency Weightings 13
- 2.5 Measured Quantities 13
- Table 2.1 14
- Frequency weight 14
- IEC 61672 – 1, Ta 14
- Table 2.2 15
- Exponential time 15
- CHAPTER 2 16
- ∆t where: 17
- 2.5.4 Spectrum Measurements 18
- Chapter 3 20
- 3.6 EMC test procedures 21
- 3.6.4 Accessories 22
- Chapter 4 24
- 4.5 Microphone 25
- 4.6 Frequency Response 25
- CHAPTER 4 26
- 4.6.3 Low-frequency Responses 27
- 4.7 Directional Response 31
- Table A.25 35
- Table A.32 37
- Table A.34 to Table A.36 39
- Table A.44 to Table A.46 42
- 4.8 Self-generated Noise 44
- 4.9 Measuring Range 46
- 4.9.4 Indicator Range 47
- 4.9.5 Linearity Range 47
- 4.9.6 Pulse Range 47
- 4.9.7 Linear Operating Range 47
- 4.10 Detectors 48
- 4.10.2 Linear Averaging 49
- 4.10.3 Peak 49
- 4.11 Spectrum Analysis 50
- 4.11.3 Linear Operating Range 51
- 4.11.4 Measurement Range 52
- Fig.4.31 53
- The most sensitive 53
- Table 4.13 53
- Magnetic Fields 53
- 4.13.2 Trigger Socket 54
- 4.14.1 Output Socket 54
- 4.14.2 Headphones Socket 54
- 4.15 Power Supply 55
- 4.16 Warm-up Time 55
- 4.17 Real-time Clock 55
- Appendix A 58
- angle of incidence to 65
- ‘UA 1404’ 69
- A.4 Directional Responses 71
- APPENDIX A 100
- Instruction Manual 101
- 500 Hz – 3550 Hz 105
- 4000 Hz – 10600 Hz 106
- 11200 Hz – 20000 Hz 107
- Appendix B 110
- APPENDIX B 112
- B.3 Irrelevant Topics 116
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