Rion NC-75 Instruction Manual
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Rion NC-75 Instruction Manual

Sound calibrator
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INSTRUCTION MANUAL
Sound Calibrator
NC-75
3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan
http://www.rion.co.jp/english/

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  • Page 1 INSTRUCTION MANUAL Sound Calibrator NC-75 3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan http://www.rion.co.jp/english/...
  • Page 3 Organization of this manual This manual describes the features and operation principles of the sound calibrator NC-75. The contents of this instruction manual is based on IEC 60942:2003. The following pages contain important information on safety. Be sure to read this part.
  • Page 4 Preparations Describes how to insert batteries and use the adapter. Calibration Describes the basic steps and procedures for calibration. Reference Describes the calibration values for sound level meter and analyzer. Also describes effects of exposure to radiofrequency fi elds. Specifi cations Lists the technical specifi cations of the unit * All company names and product names mentioned in this manual are trademarks or registered trademarks of their respective owners.
  • Page 5 This product can be used in any areas including residential areas. To conform to the EU requirement of the Directive on Waste Electrical and Electronic Equipment, the symbol mark on the right is shown on the instrument. The product described in this manual is in conformity with the following European standards;...

  • Page 6: For Safety

    FOR SAFETY In this manual, important safety instructions are specially marked as shown below. To prevent the risk of death or injury to persons and severe damage to the unit or peripheral equipment, make sure that all instructions are fully understood and observed.
  • Page 7 To reduce the risk of inadvertent damage from water, dust, vibrations, shocks etc., it is recommended to perform calibration with the unit placed in its soft case NC-75-011.
  • Page 8 When not using the unit, it is recommended to leave the unit in the soft case NC-75-011 and just close the lid. Store the unit in the desiccator in locations subject to high temperatures and high humidity. Do not use the unit for any purpose other than calibrating sound level meters or microphones.
  • Page 9 When using the unit near rotating machinery, take care the strap VM-63-017 cannot be caught in the machinery. In case of malfunction, do not attempt any repairs. Note the condition of the unit clearly and contact the supplier. Dispose of the unit and of used batteries in accordance with local laws and regulations.
  • Page 10 Be sure to use only the 1/2-inch microphone adapter NC-75-022 and 1/4-inch microphone adapter NC-75-S11 designed specifi cally for the NC-75. Using another adapter may prevent correct calibration. viii...

  • Page 11: Table Of Contents

    JCSS calibration ................2 Controls and features ..............3 Preparations ..................6 Inserting the batteries ..............6 Using the 1/2-inch microphone adapter NC-75-022 and the 1/4-inch microphone adapter NC-75-S11 ......8 Attaching the hand strap VM-63-017 ........10 Using the soft case NC-75-011 ..........11...
  • Page 12 Reference ..................17 Sound level meter and analyzer calibration value ..... 17 Sealing mechanism ..............21 Electromagnetic compatibility ..........23 Specifi cations ................27...

  • Page 13: Outline

    Outline The NC-75 is a 1 kHz, 94 dB sound calibrator conforming with JIS C 1515:2004 Class 1 (IEC 60942:2003 class 1) specifi cations. While being compact, lightweight, and easy to use, the unit meets the performance requirements for calibrating precision sound level meters.

  • Page 14: Jcss Calibration

    JCSS calibration The sound calibrator NC-75 has undergone full JCSS calibration and provides traceability according to the requirements of the Japan Measurement Act, Article 134 for Specifi ed Standard Instruments (National Measurement Standard). This means that calibration results obtained with this sound calibrator have credibility on the national level.

  • Page 15: Controls And Features

    Controls and features Soft case 1/2-inch microphone adapter NC-75-011 NC-75-022 1/4-inch microphone adapter Coupler NC-75-S11(option) Battery cover Rear panel Case Hand strap VM-63-017 Power switch Strap hole...
  • Page 16 Two batteries (Alkaline batteries LR6 or Ni-MH secondary batteries) are inserted here. Lights up when the power switch is set to ON. Power switch Serves to turn the unit on and off. 1/2-inch microphone adapter NC-75-022 Use this adapter when the outer diameter of the microphone is 1/2 inch.
  • Page 17 1/4 inch. Hand strap VM-63-017 Attaching this strap to the strap hole and wrapping the strap around the wrist when carrying the NC-75 reduces the risk of dropping the unit. Strap hole Use this hole to install the supplied strap VM-63-017.

  • Page 18: Preparations

    Preparations Inserting the batteries 1. Open the case by pressing the sections marked PUSH and pulling the battery cover off the case. PUSH Press the PUSH sections on both side and open the case.
  • Page 19 Preparations 2. Insert two batteries (Alkaline batteries LR6 or Ni-MH secondary batteries) with correct polarity. 3. Snap the battery cover onto the case again. Important - Before inserting the batteries, check the correct + and − orientation as shown above. The polarity is also marked inside the battery wells.

  • Page 20: Using The 1/2-Inch Microphone Adapter Nc-75-022 And The 1/4-Inch Microphone Adapter Nc-75-S11

    If the outer diameter of the microphone is 1 inch, remove the 1/2-inch microphone adapter and the 1/4-inch microphone adapter. If the diameter is 1/2 inch, use the 1/2-inch microphone adapter NC-75-022. If the diameter is 1/4 inch, use the 1/2-inch microphone adapter NC-75-022...
  • Page 21 Preparations Important Insert the 1/2-inch microphone adapter NC-75-022 and the 1/4-inch microphone adapter NC-75-S11 fully into the coupler. Otherwise correct calibration is not possible. The 1/2-inch microphone adapter NC-75-022 is equipped with a lock Align with mark function to ensure stable calibration.

  • Page 22: Attaching The Hand Strap Vm-63-017

    Preparations Attaching the hand strap VM-63-017 To help prevent dropping of the unit, pass your wrist through this strap VM-63-017 when holding the unit for measuring. Attach the hand strap VM-63-017 as shown below. Strap hole Hand strap VM-63-017...

  • Page 23: Using The Soft Case Nc-75-011

    NC-75-011. The lid of the case NC-75-011 can be fi xed as shown below, so that it does not interfere with stable calibration. The unit can be inserted into the case NC-75-011 with the hand strap VM-63-017 attached.

  • Page 24: Calibration

    To make the calibration, place the units in a perpendicular position, as shown in the illustration at left. 1. Make sure that the power switch of the NC-75 is OFF. 2. Carefully insert the microphone of the sound level meter all the way into the coupler of the sound calibrator.
  • Page 25 Calibration 3. After inserting the microphone, wait at least 30 seconds before reading the level indication on the sound level meter. Make a note of the reading, because this will be used in step 6. Note Immediately after inserting the microphone, the air pressure inside the sound calibrator will change, thereby preventing correct calibration.
  • Page 26 Calibration POWER switch 5. Set the power switch of the NC-75 to ON. - If the battery voltage of the NC-75 is normal, the LED lights up. - If the voltage is too low, the LED fl ashes. In such a case, replace both batteries with fresh ones.
  • Page 27 Calibration 6. Wait until the sound level meter reading has stabilized. Then read the indicated value. Verify that this reading is at least 20 dB higher than the reading obtained in step 3. Important If the difference is less than 20 dB, ambient noise has too much infl uence on the measurement, and correct calibration will not be possible.
  • Page 28 Calibration 8. When level adjustment is completed, set the power switch of the NC-75 to OFF. 9. Carefully remove the microphone of the sound level meter from the NC-75 (see the “Important” on page 12). Note If the microphone is removed with the power switch in the ON position, power will go off automatically after about 5 seconds.

  • Page 29: Reference

    Reference Sound level meter and analyzer calibration value If the sound calibrator NC-75 is used for acoustic calibration of a sound level meter and an analyzer, adjust the respec- tive equipment so that the sound pressure level indication matches the calibration value. When calibrating a sound level meter, use the values given in Table 1 as a reference.
  • Page 30 Reference Example When calibrating the sound level meter NL-42, the calibration value would be 93.9 dB from Table 1. Attach this unit to the microphone (sound level meter) and adjust the level to indicate value of NL-42 will be 93.9 dB. For the calibration procedure, refer to the sound level meter instruction manual.
  • Page 31 Reference Calibration values for sound level meters Class 1 Sound level meter Class 2 Sound level meter Model Microphone Calibration Model Microphone Calibration value (dB) value (dB) NA-28 UC-59 94.0 NL-20 UC-52 93.9 NA-42S UC-53A 94.0 NL-21 UC-52 93.9 NA-83 MS-11 94.0 NL-22...
  • Page 32 Reference Calibration values for microphones Nominal outer Calibration Model diameter value (dB) UC-27 93.8 UC-34 93.9 1 inch UC-35 93.9 UC-30 94.0 UC-31 93.9 UC-33P 94.0 UC-52 93.9 UC-53A 94.0 1/2 inch UC-57 94.0 UC-59 94.0 UC-59L 94.0 MS-11 94.0 MS-11A 94.0 UC-29...

  • Page 33: Sealing Mechanism

    Reference Sealing mechanism Sealing material Sealing material Coupler or adapter Microphone insertion direction Upon inserting a microphone for calibration, the microphone begins to be gripped by the sealing material once it reaches point A in the above illustration. Upon full insertion, the microphone stops at point B and is held in place by the sealing material.
  • Page 34 Reference Sealing material dimensions (representative) Microphone Nominal outer diameter 1 inch 24.0 23.3 11.5 1/2 inch 13.4 13.3 11.1 1/4 inch Unit: mm Table 3...

  • Page 35: Electromagnetic Compatibility

    Reference Electromagnetic compatibility Reference orientation for testing effects of exposure to radiofrequency fi elds: Opposite side of microphone insertion opening (see illustration below) Reference orientation for testing effects of exposure...
  • Page 36 Reference Radiofrequency emissions Electromagnetic fi eld strength of radiofrequency emissions produced by the unit (quasipeak value at a distance of 10 m) Frequency range 30 MHz to 230 MHz: 30 dB (reference 1 μV/m) or less Frequency range 230 MHz to 1 GHz: 37 dB (reference 1 μV/m) or less The confi guration for greatest radiofrequency emissions: power ON Immunity to electrostatic discharges No malfunction after the following electrostatic discharge tests...
  • Page 37 Reference Immunity to power-frequency magnetic fi elds and radiofrequency electromagnetic fi elds Sound pressure level deviation when placed under the infl uence of power-frequency magnetic fi elds and radiofrequency electromagnetic fi elds as specifi ed below: within ±0.25 dB (excluding maximum permitted uncertainties of measurement) Electromagnetic fi eld strength up to 10 V/m rms (non-modulated), frequency range 26 MHz to 1000 MHz, 900 Hz sinusoidal wave, 80% amplitude modulation...
  • Page 38 Reference The confi guration that produce minimum immunity (maximum susceptibility) to power-frequency magnetic fi elds and radiofrequency electromagnetic fi elds: power ON...

  • Page 39: Specifi Cations

    Applicable standards IEC 60942:2003 class 1 ANSI/ASAS1.40-2006 class 1 JIS C 1515:2004 class 1 CE marking WEEE Directive Chinese RoHS Specifi ed microphones Microphones made by RION as well as microphones made by other manufacturers that meet the IEC 61094-4 size specifi cations 1-inch microphones...
  • Page 40 Specifi cations 1/2-inch microphones (supplied adapter NC-75-022 is used) 1/4-inch microphones (optional adapter NC-75-S11 is used) Reference environmental conditions Static pressure: 101.325 kPa Ambient temperature: 23ºC Relative humidity: 50% RH Ambient conditions for operation Static pressure: 65 kPa to 108 kPa Ambient temperature: −10˚C to +50˚C...
  • Page 41 Ni-MH secondary batteries (eneloop pro) : 50 hours or higher Power supply voltage Nominal 3.0 V, Maximum 3.6 V, Minimum 2.1 V Automatic power shutoff Power will shut down after about 5 seconds if coupler is open (may not apply if 1/4-inch microphone adapter NC-75-S11 is mounted)
  • Page 42 Specifi cations Nominal sound pressure level 94 dB Specifi ed sound pressure level 94.0 dB (at reference environmental conditions) Specifi ed sound pressure level tolerance ±0.25 dB (at reference environmental conditions) (Average value for a 20-second period) Nominal frequency 1000 Hz Specifi ed frequency 1000 Hz (at reference environmental conditions) Specifi ed frequency tolerance...
  • Page 43 Specifi cations Sound pressure level stability (short-term fl uctuations) ±0.05 dB (at reference environmental conditions) [20 s, Time Weighting F (JIS C 1509-1, IEC 61672-1)] Sound pressure level stability (Infl uence of power supply voltage) ±0.05 dB (at reference environmental conditions, within power supply voltage range) Frequency stabilization duration After power-on:...
  • Page 44 Specifi cations Permissible ambient sound level 84 dB max. Supplied accessories Soft case NC-75-011 (Calibration possible with unit inserted in soft case) 1/2-inch microphone adapter NC-75-022 Alkaline batteries LR6 Hand strap VM-63-017 Instruction manual Inspection certifi cate JCSS calibration certifi cate...
  • Page 45 Specifi cations Unit: mm Dimensional Drawings...
  • Page 46 No. 61932 17-11...

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