Rion NB-14 Instruction Manual
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Rion NB-14 Instruction Manual

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Noise Dosimeter NB-14
Instruction Manual
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Summary of Contents for Rion NB-14

  • Page 1 Noise Dosimeter NB-14 Instruction Manual Technical Guide...

  • Page 3: Organization Of The Nb-14 Instruction Manual

    Organization of the NB-14 Instruction Manual There are four types of instruction manuals for Noise Dosimeter NB-14. Quick Start Guide This manual describes the basic handling of Noise Dosimeter NB-14. Hardware Guide This manual describes the detailed instructions for handling Noise Dosimeter NB-14.

  • Page 4: Table Of Contents

    Contents Organization of the NB-14 Instruction Manual Microphone Structure and how it works …………………………………………………………………………… 3 Microphone UC-52 specifications ……………………………………………………………………… 4 Frequency Weighting Measurement Function (Time-average sound level, equivalent continuous sound level) …………………………… 6 (C-weighted peak sound level) ………………………………………………………………… 6 Cpeak DOSE [%] …………………………………………………………………………………………………...

  • Page 5: Microphone

    Microphone Noise Dosimeter NB-14 is fitted with a free-field electret microphone UC-52 that is 1/2 inch in diameter. Structure and how it works As shown in the figure below, in general, the electret condenser microphone used for taking measurements consists of five parts: a diaphragm, film, back electrode, insulator, and case.

  • Page 6: Microphone Uc-52 Specifications

    Microphone Microphone UC-52 specifications Model UC-52 Nominal outer diameter 1/2 inches Sensitivity level (representative value) -33 dB (re. 1 V/Pa at 1 kHz, standard environmental conditions*) Frequency response 20 Hz to 8 kHz Capacitance (representative value) 19 pF Φ13.2 mm × 12.0 mm Dimensions Weight 5.4 g...

  • Page 7: Frequency Weighting

    Frequency Weighting Frequency weighting A and C of the sound level meter are achieved by frequency weighting circuits with electrical characteristics as shown in the following figure. Response (dB) A-weighting C-weighting 100 200 500 1 k 5 k 10 k 20 k 50 k Frequency (Hz) Characteristics of frequency weighting circuits...

  • Page 8: Measurement Function

    With NB-14, L is calculated digitally using the following formula: : Number of samples The sampling cycle of NB-14 is 20.8 µs (48,000 samples per second). (C-weighted peak sound level) Cpeak The maximum absolute value of instantaneous C-weighted sound pressure within the measurement time can be...

  • Page 9: Dose [%]

    Permitted level The daily exposure is obtained by adding up L (stored every second in NB-14) to which the worker is exposed during the workday. The permitted level is a value determined from the criterion time and level, which is above example is 8 hours, 85 dB.
  • Page 10 Measurement Function The DOSE calculated by the equivalent continuous sound level values measured for 8 hours per day is shown in Tables 3 and 4. Table 3 shows the DOSE value when the criterion level is 85 dB and 90 dB in Table 4. Table 3.

  • Page 11: Descriptions For Iec 61672-1 (Jis C 1509-1) / Iec 61252

    Configuration and normal mode of operation 9.2.1 b) Configuration • NB-14 • Dedicated windscreen Normal operating conditions • NB-14 with the dedicated windscreen attached » Instruction Manual: Hardware Guide [Name of Each Part / List of Accessories] [Charging Method] 5.1.5 Conformance class 9.2.1 a)
  • Page 12 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Standard Explanation paragraph Description also NB-14 5.1.18 Characteristics and operations of each independent 9.2.1 e) Not applicable (1 channel only) channel 5.1.19 Initial stabilization time (time from turning on the 9.2.6 d)
  • Page 13 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Standard Explanation paragraph Description also NB-14 Frequency weightings 5.5.5 Table of directional index in relation to random 9.3 e) » Refer to Tables 13 and 14 incidence characteristics 5.5.8 Design targets and tolerances for optional frequency 9.2.2 k)
  • Page 14 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Standard Explanation paragraph Description also NB-14 5.18.4 Update cycle and conditions from the start of taking 9.2.2 g) Not applicable measurements until the first indicated value is displayed 5.18.5 Method for downloading digital data 9.2.6 l)
  • Page 15 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Standard Explanation paragraph Description also NB-14 A.C. power-frequency and radio-frequency fields 6.6.1 Operation mode and connection state where the 9.3 o) Refer to Fig. 6-1 and 6-2 effects of power frequency magnetic fields and radio...
  • Page 16 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Standard Explanation paragraph Description also NB-14 9.2.2 Design features 9.2.2 a) Measurable quantity 5.18.3 Refer to 5.18.3 9.2.2 b) Directional characteristics 5.4.5 Refer to 5.4.5 9.2.2 c) Frequency weightings that comply with standards 5.1.10...
  • Page 17 Time required from this operation to reinitialize from resetting to measurement reinitialization measuring: < 20 seconds Depending on the measurement time and the number of files in NB-14, it may take about 1 minute from the end of measurement to the next measurement. 9.2.6 j) Behavior of overload indication and underrange 5.11.1...
  • Page 18 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Standard Explanation paragraph Description also NB-14 9.3 g) Starting point for level linearity calculation error testing 5.6.11 Refer to 5.6.11 9.3 h) Design targets and tolerance limits for electrical 5.1.15 Refer to 5.1.15...

  • Page 19: Descriptions For Iec 61252

    Components and normal operating conditions Components • NB-14 • Dedicated windscreen Normal operating conditions • NB-14 with the dedicated windscreen attached » Instruction Manual: Hardware Guide [Name of Each Part / List of Accessories] [Charging Method] Means of electrical signal input...
  • Page 20 Standard paragraph Description Explanation Absolute acoustical sensitivity Calibration means for personal noise Compatible sound calibrators dosimeter NC-75/NC-74 (RION) Calibration Method » Instruction Manual: Hardware Guide [Calibration Method] Frequency weighting Dosimeter frequency response with Refer to Table 5 A-weighting Linearity of response to steady signal...
  • Page 21 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Standard paragraph Description Explanation 13.2 Display of the IEC 61252:1993 mark Main unit: Refer to “Nameplate” Attachment position of the nameplate » Instruction Manual: Hardware Guide [Name of Each Part / List of Accessories] Instruction Manual Recommendations when wearing personal...
  • Page 22 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Standard paragraph Description Explanation Effects of radio frequency electromagnetic Refer to 12.6 fields, electrostatic discharge and machine Refer to 12.7 vibration Refer to 12.8 Battery type and continuous operating time Refer to 4.12 Recommended procedure for checking battery Refer to 4.12 level...

  • Page 23: Free Field Characteristics

    Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 NB-14 free field characteristics Table 5. NB-14 free field characteristics Microphone Free-field Influence of Case Influence of NB-14 Nominal Exact Response (dB) Reflection (dB) Windscreen (dB) Electrical Frequency Frequency Response...
  • Page 24 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Microphone Free-field Influence of Case Influence of NB-14 Nominal Exact Response (dB) Reflection (dB) Windscreen (dB) Electrical Frequency Frequency Response UC-52 Expanded Expanded Expanded (Hz) (Hz) NB-14 NB-14 (dB) (NB-14)

  • Page 25: Reference Incident Direction And Position Of Reference Point

    Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Reference incident direction and position of reference point Reference incident direction Position of reference point Center point on diaphragm surface Fig. 1. Reference incident direction and position of reference point...

  • Page 26: Microphone Frequency Response

    Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Microphone frequency response The frequency response of a free field microphone is represented by the response to the sound waves from the reference incident direction in a free field. Below is an example of the frequency response of microphone UC-52. Response (dB) 10 k...

  • Page 27: Acoustic Influence Of Housing

    Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Acoustic influence of housing The NB-14 has a structure that minimizes reflections from the housing. Below is an example of the acoustic influence from the housing. Response (dB) 10 k...

  • Page 28: Effects Of Windscreen

    Therefore, the NB-14 is used with the dedicated windscreen attached. The characteristics of the dedicated windscreen are shown below. The effect of the dedicated windscreen on the free field characteristics of NB-14 is within ±1.0 dB up to 8 kHz, as shown in Figure 5.
  • Page 29 Fig. 4-3. Wind noise suppression with frequency weighting C (vertical) C-weighting Without dedicated windscreen Direction of wind to the microphone With dedicated windscreen Personal Noise Dosimeter RION (horizontal to the diaphragm STATUS POWER POWER LEVEL OVER UNDER of the microphone)

  • Page 30: Electromagnetic Compatibility (Emc)

    Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Electromagnetic compatibility (EMC) The following figures show the immunity test conditions (NB-14 direction, operation mode and connection state) against power frequency magnetic fields and radio frequency electromagnetic fields. A couple of things here.

  • Page 31: Microphone Free Field Correction Amount

    Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Microphone free field correction amount Table 7. Microphone free field correction amount (when calibrating sound pressure with a sound calibrator) UC-52 (NB-14) Nominal frequency (Hz) Exact frequency (Hz) Expanded uncertainty (dB) correction amount (dB) 31.5...

  • Page 32: Upper And Lower Limits Of Linear Operating Range For Sound Pressure Level

    Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 4.10 Upper and lower limits of linear operating range for sound pressure level Table 8. Upper and lower limits of linear operating range for sound pressure level (dB) A-weighting 20 Hz 31.5 Hz 1 kHz 4 kHz...

  • Page 33: Directional Characteristics

    (0°) and the measurement value of any incident angle θ . The electret condenser microphone used in the NB-14 is a pressure-type microphone, so it is primarily omnidirectional. However, at higher frequencies, it becomes directional due to the effects of structure-related diffraction and dents.
  • Page 34 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Table 9. Directional characteristics of NB-14 (horizontal direction) Nominal frequency / exact frequency (Hz) Angle (degrees) 250/251.19 315/316.23 400/398.11 500/501.19 630/630.96 800/794.33 1000/1000.0 1250/1258.9 0° 0.00 0.00 0.00 0.00 0.00 0.00...
  • Page 35 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Nominal frequency / exact frequency (Hz) Angle (degrees) 1600/1584.9 2000/1995.3 2240/2238.7 2500/2511.9 2800/2818.4 3150/3162.3 3550/3548.1 4000/3981.1 0° 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10° 0.02 0.00 -0.02 0.05 0.07 0.02 -0.05...
  • Page 36 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Nominal frequency / exact frequency (Hz) Angle (degrees) 4500/4466.8 5000/5011.9 5600/5623.4 6300/6309.6 7100/7079.5 8000/7943.3 0° 0.00 0.00 0.00 0.00 0.00 0.00 10° 0.02 -0.21 0.02 0.08 0.16 -0.35 20° -0.14 -0.77 -0.07 0.03...
  • Page 37 -15 dB 270° -20 dB 90° 260° 100° 250° 110° 240° 120° 250 Hz 230° 130° 1 kHz 220° 140° 2 kHz 210° 150° 4 kHz 200° 160° 190° 170° 8 kHz 180° Fig. 8. Directional characteristics of NB-14 (vertical direction)
  • Page 38 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Table 10. Directional characteristics of NB-14 (vertical direction) Nominal frequency / exact frequency (Hz) Angle (degrees) 250/251.19 315/316.23 400/398.11 500/501.19 630/630.96 800/794.33 1000/1000.0 1250/1258.9 0° 0.00 0.00 0.00 0.00 0.00 0.00...
  • Page 39 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Nominal frequency / exact frequency (Hz) Angle (degrees) 1600/1584.9 2000/1995.3 2240/2238.7 2500/2511.9 2800/2818.4 3150/3162.3 3550/3548.1 4000/3981.1 0° 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10° 0.09 0.17 0.12 -0.01 -0.36 -0.60 -0.26...
  • Page 40 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Nominal frequency / exact frequency (Hz) Angle (degrees) 4500/4466.8 5000/5011.9 5600/5623.4 6300/6309.6 7100/7079.5 8000/7943.3 0° 0.00 0.00 0.00 0.00 0.00 0.00 10° 0.36 -0.16 0.23 0.15 -0.32 -1.02 20° 0.79 -0.25 0.01 0.21...
  • Page 41 260° 100° 250° 110° 240° 120° 250 Hz 1 kHz 230° 130° 2 kHz 220° 140° 4 kHz 210° 150° 200° 160° 8 kHz 190° 170° 180° Fig. 9. Directional characteristics of NB-14 without the dedicated windscreen attached (horizontal direction)
  • Page 42 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Table 11. Directional characteristics of NB-14 without the dedicated windscreen attached (horizontal direction) Nominal frequency / exact frequency (Hz) Angle (degrees) 250/251.19 315/316.23 400/398.11 500/501.19 630/630.96 800/794.33 1000/1000.0 1250/1258.9 0°...
  • Page 43 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Nominal frequency / exact frequency (Hz) Angle (degrees) 1600/1584.9 2000/1995.3 2240/2238.7 2500/2511.9 2800/2818.4 3150/3162.3 3550/3548.1 4000/3981.1 0° 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10° -0.02 0.01 0.10 0.00 -0.01 0.00 0.04...
  • Page 44 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Nominal frequency / exact frequency (Hz) Angle (degrees) 4500/4466.8 5000/5011.9 5600/5623.4 6300/6309.6 7100/7079.5 8000/7943.3 0° 0.00 0.00 0.00 0.00 0.00 0.00 10° -0.17 -0.01 -0.18 -0.19 -0.01 0.13 20° -0.75 -0.14 -0.77 -0.31...
  • Page 45 260° 100° 250° 110° 240° 120° 250 Hz 1 kHz 230° 130° 2 kHz 220° 140° 4 kHz 210° 150° 200° 160° 8 kHz 190° 170° 180° Fig. 10. Directional characteristics of NB-14 without the dedicated windscreen attached (vertical direction)
  • Page 46 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Table 12. Directional characteristics of NB-14 without the dedicated windscreen attached (vertical direction) Nominal frequency / exact frequency (Hz) Angle (degrees) 250/251.19 315/316.23 400/398.11 500/501.19 630/630.96 800/794.33 1000/1000.0 1250/1258.9 0°...
  • Page 47 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Nominal frequency / exact frequency (Hz) Angle (degrees) 1600/1584.9 2000/1995.3 2240/2238.7 2500/2511.9 2800/2818.4 3150/3162.3 3550/3548.1 4000/3981.1 0° 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10° 0.09 0.20 0.20 0.17 -0.21 -0.65 -0.43...
  • Page 48 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Nominal frequency / exact frequency (Hz) Angle (degrees) 4500/4466.8 5000/5011.9 5600/5623.4 6300/6309.6 7100/7079.5 8000/7943.3 0° 0.00 0.00 0.00 0.00 0.00 0.00 10° 0.33 -0.14 -0.12 0.39 -0.46 -0.42 20° 0.24 0.39 -0.53 -0.06...

  • Page 49: Random Incidence Response

    The high-frequency response is lower in a diffuse field than in a free field. Response (dB) 10 k 100 k Frequency (Hz) Fig. 11. NB-14 random incidence response (with the dedicated windscreen installed) Response (dB) 10 k 100 k Frequency (Hz)
  • Page 50 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Table 13. NB-14 random incidence response (with the dedicated windscreen installed) Nominal frequency (Hz) Exact frequency (Hz) NB-14 random incidence response (dB) 63.096 -0.2 79.433 -0.2 100.00 -0.2 125.89 -0.2 158.49...
  • Page 51 Descriptions for IEC 61672-1 (JIS C 1509-1) / IEC 61252 Table 14. NB-14 random incidence response (without the dedicated windscreen installed) Nominal frequency (Hz) Exact frequency (Hz) NB-14 random incidence response (dB) 63.096 -0.2 79.433 -0.2 100.00 -0.2 125.89 -0.2 158.49...
  • Page 52 • QR code is a registered trademark of DENSO WAVE Incorporated. • All company names and product names mentioned in this manual are trademarks or registered trademarks of their respective owners. https://www.rion.co.jp/english/ 3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan No. 67140 23-07...

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