BRUEL & KJAER 2240 Instruction Manual
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BRUEL & KJAER 2240 Instruction Manual

Integrating-averaging sound level meter
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Technical
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Integrating-averaging
Sound Level Meter Type 2240
Instruction Manual
English BE 1694 – 12

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Summary of Contents for BRUEL & KJAER 2240

  • Page 1 Technical Documentation Integrating-averaging Sound Level Meter Type 2240 Instruction Manual English BE 1694 – 12...
  • Page 2 Integrating-averaging Sound Level Meter Type 2240 Instruction Manual BE 1694−12 March 2007...
  • Page 3 Safety Considerations This apparatus has been designed and tested in accordance with IEC 61010 – 1 and EN 61010 – 1 Safety Require- ments for Electrical Equipment for Measurement, Control and Laboratory Use. This manual contains infor- mation and warnings which must be followed to ensure safe operation and to retain the apparatus in safe condition. Special note should be made of the following: Safety Symbols The apparatus will be marked with this symbol when it is important that you refer to the associated warning...

  • Page 4: Table Of Contents

    Measuring Range ............................ 18 4.10 Detectors ..............................20 4.11 Influence from the Operating Environment....................21 4.12 Electrical Input to Type 2240 ........................21 4.13 Electrical Output from Type 2240 ......................21 4.14 Power Supply ............................22 4.15 Warm-up Time............................22 4.16 CE-mark and C-Tick mark Compliance ....................

  • Page 6: Chapter 1 Introduction

    This Instruction Manual supplements User Guide BE 1695 – 11. This manual and the User Guide together comprise the full documentation of Type 2240 as required by IEC 61672 – 1, as well as the earlier standards IEC 60651 and IEC 60804.

  • Page 7: Topics Covered In User Guide Be 1695 And Non-Applicable Topics

    User Guide and therefore, as a rule, not repeated in this manual. The table also lists the requirements that are not applicable to Type 2240. For the sake of brevity, the corresponding requirements listed in section 9.2 of IEC 61672 – 1 (which partly sums up documentation requirements) are not repeated here as they are already covered by reference to previous sections of the standard.
  • Page 8 CHAPTER 1 Introduction 5.15.4 Other quantities displayed Chapter 4 5.15.7 and 5.16.1 Digital output Not applicable 5.17.1 Display of elapsed time and preset time Chapter 4 Preset time not applicable 5.17.2 Minimum and maximum averaging times Chapter 4 5.17.1 Time-of-day Not applicable 5.17.2 Minimum and maximum averaging times...
  • Page 9 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual...

  • Page 10: Chapter 2 Hardware Setup

    Chapter 2 Hardware Setup Measuring at Low Static Pressure The frequency response of the microphone depends on the static pressure. Using a Sound Level Calibrator to adjust the sensitivity of a sound level meter at the calibration check frequency provides no information on the influence of static pressure on frequency response.
  • Page 11 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual Table 2.1 Frequency Weightings Frequency weight- Exact Frequency (1 decimal) Nominal Frequency ings according to (6 digits) (dB) (Hz) IEC 61672 – 1, (Hz) Table 2 –70.4 –14.3 12.5 12.5893 –63.4 –11.2...

  • Page 12: Measured Quantities

    CHAPTER 2 Hardware Setup Measured Quantities The measured quantities are also described in the User Guide in practical terms. For completeness, the formal definitions of the relevant quantities are given here. 2.3.1 Overload For Running Measurements, the Overload indication is displayed for as long as the overload condition exists or for a period of 1 s, whichever is the greater.
  • Page 13 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual 2.3.5 Peak Sound Level The peak sound level, Lxpk(T ), is defined as twenty times the logarithm to the base ten of the ratio of the greatest absolute instantaneous sound pressure, p (t), during a time interval starting at t = T Δ...
  • Page 14 CHAPTER 2 Hardware Setup where: ξ is a dummy variable of time integration over the averaging time interval • • (ξ) is the x frequency-weighted instantaneous sound pressure is the reference sound pressure, equal to 20 μPa • 2.3.9 Maximum Peak Sound Level The maximum peak sound level, LxpkMax(T), is defined as the greatest peak sound level, Lxpk(t), Δ...
  • Page 15 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual...

  • Page 16: Conformance Testing

    Mounting for Mechanical Vibrations Tests Type 2240 should be mounted on the shaker with a suitable holder so that the vibration is applied in a direction perpendicular to the plane of the microphone diaphragm. Electrical Substitute for Microphones To obtain a BNC type electrical input, replace the microphone with a WA-0302 –...

  • Page 17: Emc Test Procedures

    3.6.3 Testing EMC According to IEC 60804 The exponential, time-averaged detectors in Sound Level Meter Type 2240 are digital and their results calculated based on the same samples used for calculating the linear averaged detectors. Therefore, the LxFInst measurement values will be equal to short Lxeq values when measuring steady signal levels.
  • Page 18 CHAPTER 3 Conformance Testing Emission See “Testing EMC According to IEC 60804” above. Immunity as Sound Level Meter The highest Susceptibility (Susceptibility = 1/Immunity) to radio-frequency fields, is achieved when set up as shown in Fig.3.3. Fig.3.3 Setup for highest susceptibility to radio-frequency fields...
  • Page 19 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual...

  • Page 20: Chapter 4 Specifications

    The International IEC Standards are adopted as European standards by CENELEC. When this happens, the letters IEC are replaced with EN and the number is retained. Type 2240 also conforms to these EN Standards.

  • Page 21: Microphone

    Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual Microphone Microphone Type 4188 Type: Prepolarized Free-field 1/2″ Condenser Microphone Open-circuit Sensitivity: –30 dB ±2 dB re 1 V/Pa, 31.6 mV/Pa Capacitance: 12 pF (at 1000 Hz) Microphone reference point: Centre-point of protection grid’s exterior...

  • Page 22: Directional Response

    DZ-9566 Influence, the frequency weighted Electrical Responses, the overall frequency weighted Acoustical Responses, and the Expanded Uncertainties of Measurement. The Diffuse-field body influence of Sound Level Meter Type 2240 is so small that the diffuse-field frequency responses is only influenced by the Microphone Type 4188 and the Random Incidence Corrector DZ-9566.

  • Page 23: Measuring Range

    Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual 4.8.1 Maximum Broadband Self-generated Noise Table 4.2 Frequency A-Weighting C-Weighting Maximum broad- Weighting band, self-gener- Electrical 18.0 18.0 ated noise Microphone 18.0 19.0 Total 21.0 21.5 4.8.2 Typical Broadband Self-generated Noise Table 4.3...
  • Page 24 CHAPTER 4 Specifications 4.9.4 Indicator Range Table 4.6 Lower Limit Upper Limit Indicator Range Range Name (dB) according to Inter- A-weighting (dB) C-weighting (dB) national Standard IEC 60804 4.9.5 Linearity Range Linearity Range according to the International Standard IEC 60804 is the difference between the Upper and Lower Limit in the following table: Table 4.7 Lower Limit...

  • Page 25: Detectors

    Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual 4.10 Detectors Display-update rates: 1 second for all measured quantities. 4.10.1 Exponential Averaging Display-update rates: 1 second for all measured quantities. Exponential averaging times: Fast (250 ms). Table 4.11 Max. Response...

  • Page 26: Influence From The Operating Environment

    4.11.6 Immunity to Power and Radio-frequency Fields Conforms to IEC 60651, IEC 60804 and IEC 61672-1 down to 74 dB. 4.12 Electrical Input to Type 2240 Safety Limit: ±24 V Peak 4.13 Electrical Output from Type 2240 Note: For test only AC output (FLAT) Output voltage: 1 Vrms ±...

  • Page 27: Power Supply

    Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual 4.14 Power Supply 4.14.1 Input Voltage Range 1.8 V to 3.5 V 4.14.2 Batteries for Type 2240 Type: 2 × LR6/AA-size 1.5 V alkaline Lifetime (at 20°C): 16 hours continuous use (decreases significantly at low temperatures) 4.15...

  • Page 28: Electrical Frequency Responses

    Appendix A Tables Electrical Frequency Responses Table A.1 Electrical frequency response A-weighting C-weighting Nominal Exact Reference Electrical Deviation Reference Electrical Deviation Frequency Frequency Response Response from Ideal Response Response from Ideal (dB) (dB) (dB) (dB) (dB) (dB) –71.3 –70.4 –0.9 –15.2 –14.3 –0.9...
  • Page 29 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual Table A.1 (cont.) Electrical frequency response A-weighting C-weighting Nominal Exact Reference Electrical Deviation Reference Electrical Deviation Frequency Frequency Response Response from Ideal Response Response from Ideal (dB) (dB) (dB) (dB) (dB)

  • Page 30: Appendix A Tables

    APPENDIX A Tables Free-field Frequency Response Table A.2 Free-field 0° frequency response for Sound Level Meter Type 2240 with Microphone Type 4188 Nominal Exact Microphone Body Electrical Electrical Acoustical Acoustical Expanded Frequency Frequency Free-field Influence Response Response Response Response Uncertainty of...
  • Page 31 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual Table A.2 (cont.) Free-field 0° frequency response for Sound Level Meter Type 2240 with Microphone Type 4188 Nominal Exact Microphone Body Electrical Electrical Acoustical Acoustical Expanded Frequency Frequency Free-field Influence Response...

  • Page 32: Diffuse-Field Frequency Response

    APPENDIX A Tables Diffuse-field Frequency Response Table A.3 Diffuse-field frequency response for Sound Level Meter Type 2240 with Microphone Type 4188 and Random Incidence Corrector DZ-9566 Nominal Exact Microphone Random Electrical Electrical Acoustical Acoustical Expanded Frequency Frequency Diffuse-field Incidence Response...
  • Page 33 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual Table A.3 (cont.) Diffuse-field frequency response for Sound Level Meter Type 2240 with Microphone Type 4188 and Random Incidence Corrector DZ-9566 Nominal Exact Microphone Random Electrical Electrical Acoustical Acoustical Expanded Frequency...

  • Page 34: Appendix B Indexes

    Appendix B Indexes Indexes This chapter provides cross-indexes between specific paragraphs in the standards that require topics to be documented in the user manual, and the corresponding sections in this manual that conform to these. A normal index can be found at the end of this manual. Standard Cross-indexes Table B.1 IEC 60651...
  • Page 35 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual IEC 60651 (cont.) Standard Paragraph Manual Section 9.2.1 9.3.1 B.3 e), 3.5, 4.12 9.4.2 B.3 v) 9.4.4 4.10.3 10.1 10.2 B.3 o) 10.3 B.3 b) 10.4 B.3 o) 11.2.1 4.5, 1.1, 3.3 11.2.2...
  • Page 36 APPENDIX B Indexes IEC 60651 (cont.) Standard Paragraph Manual Section 11.2.35 11.2 (Note i) 12.2.3 12.3.2 B.3 n) 12.4.8 4.11.6 12.4.9 12.5.2.7 12.5.3.5 B.3 n) 12.5.4.5 12.5.4.10 4.11.6, 3.6.1 IEC 60804 Standard Manual Section Paragraph 3.11 4.5, 4.2 3.12 3.15 3.17 3.6.2 4.15, 1...
  • Page 37 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual IEC 60804 (cont.) Standard Paragraph Manual Section 11.2.13 4.11, 4.11.2 11.2.14 11.2.15 4.6.1, 4.6.2, 4.7 11.2.16 11.2.17 11.2.18 B.3 b) 11.2.19 B.3 o) 11.2.20 4.15 11.2.21 4.10.2 11.2.22 4.14.2 11.2.24 11.2.25 11.2.26...
  • Page 38 APPENDIX B Indexes IEC 61672–1 (cont.) Standard Paragraph Manual Section 5.1.7 1.1, 3.3, 4.2 5.1.8 B.3 t) 5.1.10 5.1.12 4.9.7, 1 5.1.13 4.4, 4.5, 3.6.2 5.1.14 2.3.6 5.1.15 5.1.16 4.9.1, 3.5, 4.12 5.1.17 5.1.18 4.15 5.2.1 5.2.3 1, 4.5, 4.2 5.2.4 4.5, 4.6.1, 4.2 5.2.6...
  • Page 39 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual IEC 61672–1 (cont.) Standard Paragraph Manual Section 5.17.1 5.17.2 4.10.2 5.18.1 B.3 w) 5.18.2 5.19.2 5.20.2 4.14.1 5.20.3 4.14.2 5.20.4 1, 1.1 5.20.5 4.14.1 6.1.2 4.11.1 6.2.2 (Note) 6.3.2 B.3 l) 6.5.2...
  • Page 40 APPENDIX B Indexes IEC 61672–1 (cont.) Standard Paragraph Manual Section 9.2.3 c) 9.2.3 d) 4.14.1 9.2.4 a) 9.2.4 b) 9.2.4 c) 9.2.4 d) 4.6.1 9.2.5 a) 9.2.5 b) 9.2.5 c) 9.2.5 d) 9.2.5 e) 4.15 9.2.5 f) 4.10.2 9.2.5 g) 9.2.5 h) 4.10.2 9.2.5 i)

  • Page 41: Irrelevant Topics

    Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual IEC 61672–1 (cont.) Standard Paragraph Manual Section 9.3 m) B.3 m) 9.3 n) 1, 4.2 9.3 o) 3.6.2 App. C3 4.9.5 Irrelevant Topics This section is included to have a reference for the cross-indexes to topics that are not provided in or are irrelevant for this product.

  • Page 42: Index

    Index Air temperature ............. 15 Magnetic Fields..............21 Maximum Broadband Self-generated Noise....18 Maximum Peak Sound Level ...........9 Maximum Sound Level ..........18 Current Measurement ............. 8 Maximum Time-weighted Sound Level......8 C-weighting ..............11 Measured Quantities............7 Measurement Start ............8 Measurement Stop ............8 Descriptions ..............11 Measuring Range ............18 Microphone Handbook BA 5105........5 Microphones ..............16...
  • Page 43 Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual Sound Level Calibrator Type 4231 ........5 Timed Broadband Measurements ........8 Stabilisation time............21 Time-weighted Sound Level ..........7 Standards ..............15 Total Range ..............18 Static pressure...............15 Typical stabilization time ..........21 Storage temperature range..........21 Susceptibility..............13...
  • Page 44 HEADQUARTERS: DK-2850 Nærum · Denmark · Telephone: +45 4580 0500 · Fax: +45 4580 1405 · www.bksv.com · info@bksv.com Australia (+61) 2 9889-8888 · Austria (+43) 1 865 74 00 · Brazil (+55)11 5188-8161 · Canada (+1) 514 695-8225 China (+86) 10 680 29906 · Czech Republic (+420) 2 6702 1100 · Finland (+358) 9-755 950 · France (+33) 1 69 90 71 00 Germany (+49) 421 17 87 0 ·...

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