Sound and Vibration - NEBB

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NEBB S & V PROCEDURAL STANDARDS SECTION 4 STANDARDS FOR INSTRUMENTATION AND CALIBRATION 4.2 RANGE AND ACCURACY Calibration requirements for each instrument are specified in table 4-1 and shall be met. 4.3 CALIBRATION Annual Calibration – ALL S&V instrumentation shall be maintained with a current annual calibration certificate, traceable to the National Institute of Standards and Technology (NIST), or equivalent organizations in other countries, and to the ANSI specifications listed in Table 4.1 or manufacturers specifications, whichever is more stringent. Field Calibration (Sound) – All sound instrumentation shall be field calibrated with an acoustic calibrator meeting the minimum requirements set forth in Table 4.1, at the beginning and the end of each day of use. Field calibration levels, times, and dates shall be documented in test reports. Field Calibration (Vibration) – All vibration instrumentation shall be field calibrated per manufacturer’s recommendations, and/or with a vibration calibrator meeting the minimum requirements set forth in Table 4.1. Calibration shall be performed before and after each instrument use. Field calibration levels, times, and dates shall be documented in test reports. Firms with multiple sets of instrumentation shall comply with either of the following conditions as a minimum requirement for NEBB certification: a) Calibrate all instrumentation used by the firm on S&V projects in accordance with Table 4-1. b) Maintain a complete set of calibrated instrumentation used for comparison with regularly used instrumentation. Periodic checking of regularly used instrumentation against the calibrated set shall be performed. Acceptance criteria for the results of the comparisons are the responsibility of the NEBB Qualified S&V Supervisor. Supervisors must understand the importance of using accurate instrumentation in the field, and shall be prepared to have witnesses verify their work with the Firm’s calibrated set of instrumentation. Results of the data verification shall validate the accuracy of the instrumentation used to perform the work. Or 14
NEBB S & V PROCEDURAL STANDARDS SECTION 4 STANDARDS FOR INSTRUMENTATION AND CALIBRATION TABLE 4-1 NEBB S&V INSTRUMENTATION SPECIFICATIONS Instrumentation Type Measurement Type Specifications Calibration Interval Sound Level Meters (SLM’s) Sound Pressure Measurements Shall meet the Type 1 or Type 2 requirements specified in the most current version of ANSI S1.4 American National Standard Specification for Sound Level Meters 12 Months Full and Third Octave Filters Sound Pressure Measurements Shall meet the requirements specified in the most current version of ANSI S1.11 American National Standard Specification for Octave-Band and Fractional-Octave- Band Analog and Digital Filters 12 Months Real Time Analyzers Sound Pressure Measurements Shall meet the minimum requirements as specified in ANSI S1.4 and S1.11 and, Lines of resolution ≥ 400 Frequency range capability = 0 – 20,000 Hz True dynamic range ≥ 70 dB Sum and exponential averaging Peak hold function Memory for storage of measurements 12 Months Vibration Integrators for Sound Level Meters Vibration Measurements Shall meet the minimum requirements as specified below: Displacement – 0.1 to 100 mils, Velocity – 0.005 to 100 in/sec Acceleration – 0.01 to 100 G’s Frequency Range – 1 to 10,000 Hz Frequency Resolution 1/3-Octave – 12.5 to 20,000 Hz, 12 Months Vibration Meters Vibration Measurements Shall meet the minimum requirements as specified below: Displacement – 0.1 to 100 mils, Velocity – 0.005 to 100 in/sec Acceleration – 0.01 to 100 G’s Frequency Range – 1 to 200 Hz (0 to 12,000 CPM) Frequency Resolution Narrowband – 1 Hz 12 Months Accelerometers / Transducer Vibration Measurements Shall have the following minimum specifications: Sensitivity (± 10 %) ≥ 100 mV/G Measurement Range = ± 50 G peak Frequency Range = 1 to 1000 Hz at ± 5 % Mounted Natural Frequency ≥ 30,000 Hz 12 Months Acoustic Calibrators Sound Pressure Calibration Shall meet the requirements specified in the most current version of ANSI S1.40-1984 (R2001) American National Standard Specification for Acoustical Calibrators 12 Months Vibration Calibrators Vibration Calibration Shall have the following minimum specifications: Operating Frequency = 159.2 Hz Acceleration Output = 1.00 G rms ± 3% Distortion (with 0 to 100 gram load) ≤ 3% 12 Months 15
Page 1 and 2: PROCEDURAL STANDARDS FOR MEASUREMEN
Page 3 and 4: FOREWORD The purpose of the NEBB Pr
Page 5 and 6: TABLE OF CONTENTS Foreword NEBB Sou
Page 7 and 8: NEBB S & V PROCEDURAL STANDARDS TAB
Page 9 and 10: PART 1 - STANDARDS SECTION 1 DEFINI
Page 11 and 12: NEBB S & V PROCEDURAL STANDARDS SEC
Page 15 and 16: SECTION 2 NEBB PROGRAM, QUALITY CON
Page 19 and 20: SECTION 3 RESPONSIBILITIES 3.1 INTR
Page 21: SECTION 4 STANDARDS FOR INSTRUMENTA
Page 25 and 26: SECTION 5 STANDARDS FOR REPORTS AND
Page 29 and 30: PART 2 - PROCEDURES SECTION 6 PRELI
Page 35 and 36: SECTION 7 VIBRATION MEASUREMENT PRO
Page 41 and 42: SECTION 8 SOUND MEASUREMENT PROCEDU
Page 45 and 46: APPENDICES APPENDIX A SAMPLE S&V SP
Page 47 and 48: NEBB S&V PROCEDURAL STANDARDS APPEN
Page 53 and 54: APPENDIX B SAMPLE S&V SPECIFICATION
Page 59 and 60: APPENDIX C SAMPLE S&V REPORT FORMS
Page 73 and 74:
INDEX A A-Weighting, 1 Acceleration
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