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Rion NC-72B Instruction Manual

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INSTRUCTION MANUAL
Pistonphone
NC-72B
3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan
https://www.rion.co.jp/english/

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  • Page 1 INSTRUCTION MANUAL Pistonphone NC-72B 3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan https://www.rion.co.jp/english/...
  • Page 3 Organization of this manual This manual describes the features and operation of the Pistonphone NC-72B. This manual contains the following sections. Outline Gives basic information on the unit. NC-72B Main Unit External View Contains drawings that show the pistonphone from all sides.
  • Page 4 Reference Explains output level differences and compensation according to atmospheric pressure and microphone combinations, and explains the infl uence of radio frequency fi elds. Specifi cations Lists the technical specifi cations of the unit. * All company names and product names mentioned in this manual are usually trademarks or registered trademarks of their respective owners.

  • Page 5: 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. Important Disregarding instructions printed here incurs the risk of damage to...
  • Page 6 Precautions • Read the documentation carefully, and operate the unit only as described in this manual. • Do not use or store the unit in locations which may be subject to splashes of water subject to high levels of dust subject to direct sunlight subject to vibrations or shock subject to air with high salt or sulphur content, to gases, or are in the vicinity of...
  • Page 7 • To prevent the risk of battery fl uid leakage, remove the batteries from the unit when not using it. • This product does not require lubrication. Do not apply oil or similar to any part of the unit. • Do not try to disassemble or alter the unit.
  • Page 8 • To clean the unit, use only a dry cloth or a cloth lightly moistened with lukewarm water. Do not use solvents or alcohol-based cleaners. • When mounting and dismounting the microphone of the sound pressure measurement system (sound level meter), do not rotate the microphone or pistonphone. Otherwise the protective grid of the microphone may become loose or detached, causing damage to the microphone diaphragm.

  • Page 9: Table Of Contents

    Contents FOR SAFETY .....................iii Outline ......................1 NC-72B Main Unit External View ............... 2 Accessories External View ................3 Names of Parts and Functions ..............5 Coupler ....................5 Power supply section ................6 Side view ....................7 Operation ..................... 8 Inserting the batteries ................
  • Page 10 viii...

  • Page 11: Outline

    Outline The pistonphone NC-72B is a sound calibrator that conforms to IEC 60942:2017 class LS/M, class 1/M and JIS C 1515:2020 class LS/M, class 1/M specifi cations. It uses a purely mechanical sound generation mechanism that changes very little over time. Sound is generated with constant sound pressure and frequency regardless of changes in the ambient environment.

  • Page 12: Nc-72B Main Unit External View

    NC-72B Main Unit External View...

  • Page 13: Accessories External View

    Accessories External View 1/2-inch adapter 1/4-inch adapter Barometer Alkaline batteries (LR6)
  • Page 14 Accessories External View INSTRUCTION MANUAL Pistonphone NC-72B 3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan https://www.rion.co.jp/english/ Recycled papers are used for this manual. Instruction manual (this document) Carrying case...

  • Page 15: Names Of Parts And Functions

    Names of Parts and Functions Coupler Coupler Insert the microphone of the sound pressure mea- surement system (sound level meter) here. Use the 1/2-inch or 1/4-inch adapter as required by the microphone. Coupler Important The coupler section also contains the piston part that generates sound pressure. If a foreign object enters the coupler, correct sound pressure and frequency are not assured.

  • Page 16: Power Supply Section

    Names of Parts and Functions Power supply section Battery compartment screw Battery voltage monitor (LED) Power switch Battery compartment screw Turn this screw to open the cover for battery replacement. Battery voltage monitor (LED) Enables to visually check the state of the batteries. Power switch Turns the unit on and off.

  • Page 17: Side View

    Names of Parts and Functions Side view Nominal sound pressure level Nominal frequency Serial number...

  • Page 18: Operation

    Operation Inserting the batteries Battery compartment Battery label Battery selector Screwdriver slot Battery compartment screw Six batteries Cover 1. Remove the cover from the unit. Insert a fl at-blade screwdriver into the slot of the battery compartment screw and turn it counterclockwise to remove the cover. Make sure not to turn the screw too much to prevent it from coming off.
  • Page 19 Operation 2. Set the switch to the correct position, according to the battery type in use. When using alkaline batteries (LR6) or manganese batteries (R6P), select the “ALKA- LINE/MANGANESE” position. When using nickel-hydride rechargeable batteries (HR6), select the “Ni-MH” position. Important Even if the switch setting does not match the battery used, there is no effect on the calibration result.
  • Page 20 Operation Important - To avoid dropping the batteries, perform battery replacement at a suitable and safe location. - Make sure to insert batteries with correct +, − orientation as shown above. (The label in the battery compartment also indicates the polarity.) - A total of six batteries are required.

  • Page 21: Checking The Battery Voltage

    Operation Checking the battery voltage Flashing Battery voltage Battery voltage low Unit cannot normal (Unit can still be used) be used When turning power to the unit on, use the battery voltage monitor (LED) to check the state of the batteries. If the battery voltage monitor (LED) is off, the batteries must be replaced.

  • Page 22: Sound Pressure Measurement System (Sound Level Meter) Calibration

    Operation Sound pressure measurement system (sound level meter) calibration 1. Make sure that power to the pistonphone is turned off. 2. Set the frequency weighting of the sound pressure measurement system (sound level meter) to “Z” or “C”. 3. Select the measurement range of the sound pressure measurement system (sound level meter) so that 114 dB can be measured.
  • Page 23 Operation Note Provided that the microphone inserted into the coupler of the pistonphone is seated fi rmly without play, the pistonphone may basically face any direction during use. The recommended calibration procedure is as follows. Position the pistonphone and microphone horizontally and insert the microphone. Adjust the position so that the coupler and the microphone are at the same height, and make sure that there is no play.
  • Page 24 Operation 7. Turn the power to the pistonphone on. Wait until the indication of the sound pressure measurement system (sound level meter) has stabilized. Then read the indicated value. Verify that the value is at least 30 dB higher than the value obtained in step 6. Important If the difference in readings is less than 30 dB, correct calibration will not be possible, due to the infl uence of background noise.
  • Page 25 Operation 9. When level adjustment is completed, turn the power to the pistonphone off. 10. Carefully and slowly remove the microphone of the sound pressure measurement system (sound level meter) from the pistonphone. Important When removing the microphone from the pistonphone, always proceed very slowly and carefully, to avoid the possibility of damage to the microphone diaphragm caused by abrupt changes in air pressure.

  • Page 26: Using The Microphone Adapters

    Operation Using the microphone adapters When the external diameter of the microphone is 1/2 inch or 1/4 inch, use the supplied 1/2-inch or 1/4-inch adapter. • Insert the adapter fully into the coupler. Otherwise correct calibration is not possible. • After use, be sure to remove the adapter from the coupler.

  • Page 27: Reference

    Reference Output sound pressure level compensation The output sound pressure level generated by the pistonphone depends on a certain extent on the static pressure (atmospheric pressure) and on the effective load volume that is applied due to the mounting of the microphone (this will differ according to the microphone type). When performing calibration, compensation for these two quantities must be provided to determine the exact output sound pressure level.
  • Page 28 Reference Change of output sound pressure level according to static pressure (atmospheric pressure) The output sound pressure p (N/m ) produced by the pistonphone changes at a rate proportional to the static pressure (atmospheric pressure). In order to calculate the exact sound pressure level, the static pressure at the time of use must be measured, and the sound pressure level given on the supplied calibration chart must be corrected according to the static pressure.
  • Page 29 Reference The output sound pressure level L (dB) with compensation for static pressure (atmospheric pressure) is expressed by equation 3. Output sound pressure level L (dB) = L + 20 × log ......Equation 3 Static pressure at time of use : Reference static pressure 101.325 kPa (reference conditions) Specifi ed sound pressure level for microphone in use...
  • Page 30 Reference Output sound pressure level compensation using supplied barometer The barometer supplied with this unit supports both class LS/M and class 1/M. It can be used to provide compensation of the sound pressure level for a static pressure (atmospheric pressure) range of 905 hPa to 1055 hPa (90.5 kPa to 105.5 kPa). Place the barometer on a level horizontal surface and lightly tap it with your fi ngertip to stabilize the needle.
  • Page 31 Reference Microphone effective load volume and output sound pressure level change Depending on the microphone type, there will be a slight difference in output sound pressure level inside the coupler of the pistonphone. This is due to differences in the microphone prechamber volume and diaphragm equivalent volume, which cause a difference in the total volume of the coupler.
  • Page 32 Reference Output sound pressure level change according to effective load volume (compensation values) Microphone type Change (compensation value, dB) Remarks UC-25 −0.08 1-inch microphone UC-27 −0.03 UC-34 −0.10 UC-26 −0.13 UC-28 −0.09 UC-30 −0.09 UC-31 −0.06 UC-33P −0.07 UC-52 −0.03 1/2-inch microphone UC-53A −0.09...
  • Page 33 Reference Change for other brand microphones (compensation value, for reference) Change Microphone type Remarks (compensation value, dB) Tokyo Riko MR-103 +0.24 Tokyo Riko MR-103 +0.12 without grid 1-inch microphone B&K 4160 without +0.12 grid 1/2-inch microphone B&K 4180 0.00 Using 1/2-inch adapter (NC-72-S26)
  • Page 34 Reference Output sound pressure level compensation (example) In actual use, the output sound pressure level generated by the pistonphone is calculated by applying compensation for the microphone effective load volume (differs according to microphone type) and the static pressure (atmospheric pressure). The output sound pressure level L (dB) is therefore obtained as follows.
  • Page 35 Reference 2. When compensation value C for effective load volume of microphone is known Output sound pressure level L (dB) = L + 20 × log 101.325 : Specifi ed sound pressure level (at reference environmental conditions and refer- ence load volume, as noted on calibration chart, dB) Static pressure at time of use (kPa) Reference static pressure: 101.325 kPa...
  • Page 36 Reference 3. When effective load volume of microphone is known 1-inch microphone Output sound pressure level L (dB) + (−0.00041 × (V − 960)) + 20 × log 101.325 1/2-inch or 1/4-inch microphone Output sound pressure level L (dB) + (−0.00041 × (V −...
  • Page 37 Reference Example: Output sound pressure level L for 1/2-inch microphone with known effective load volume Specifi ed sound pressure level L 114.05 dB (example, at reference envi- ronmental conditions and reference load volume, as noted on calibration chart) Static pressure at time of use P 98.8 kPa (example, measured with barom- eter at time of use) Microphone effective load volume V...

  • Page 38: Electromagnetic Compatibility

    Reference Electromagnetic compatibility Reference orientation for testing effects of exposure to radio frequency fi elds: Opposite side of microphone insertion opening (see illustration below) Reference orientation for testing effects of exposure to radio frequency fields...
  • Page 39 Reference Radio frequency emissions Electric fi eld strength of radio frequency emissions produced by the unit (quasi-peak 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 radio frequency emissions: power ON...
  • Page 40 Reference Immunity to power frequency and radio frequency fi elds Output sound pressure level deviation when placed under the infl uence of power frequency and radio frequency fi elds as specifi ed below: ±0.10 dB or less • Root-mean-square electric fi eld strength up to 10 V/m (non-modulated), frequency range 26 MHz to 1000 MHz, 900 Hz sinusoidal wave, 80% amplitude modulation •...

  • Page 41: Specifi Cations

    JIS C 1515:2020 class LS/M, class 1/M CE marking, UKCA marking, WEEE Directive, China RoHS Specifi ed microphones Microphones made by RION as well as microphones made by other manufacturers that meet the IEC 61094-1, IEC 61094-4 size spec- ifi cations...
  • Page 42 Specifi cations Reference environmental conditions Static pressure (atmospheric pressure) 101.325 kPa Ambient temperature 23°C Relative humidity 50% RH Reference load volume of microphone 960 mm (total coupler volume 21245 mm (representative value)) Load volume of supplied microphone adapters 1/2-inch adapter Model NC-72-S26 Load volume 909 mm...
  • Page 43 Specifi cations Ambient conditions for operation Static pressure (atmospheric pressure) 65 kPa to 108 kPa Ambient temperature −10°C to +55°C Relative humidity 10% to 90% RH (no condensation) Ambient temperature range for storage −20°C to +60°C (no condensation) Dimensions Approx. 44 mm (W) × 62 mm (H) × 170 mm (D) Weight Approx.
  • Page 44 Specifi cations Battery life 15 hours or higher (using six LR6 batteries, at reference environmental conditions) 4 hours or higher (using six R6P batteries, at reference environmental conditions) 13 hours or higher (using six HR6 batteries, at reference environ- mental conditions) Nominal sound pressure level 114 dB Specifi ed sound pressure level...
  • Page 45 Specifi cations Specifi ed frequency tolerance Using specifi ed frequency on supplied calibration chart as reference, ±0.1% (at reference environmental conditions) Sound pressure level stabilization duration After power-on: 5 seconds or less (at ambient conditions for operation) After microphone insertion: 30 seconds or less (at ambient conditions for operation) Sound pressure level stability (short-term fl uctuations) ±0.03 dB (at reference environmental conditions)
  • Page 46 94 dB max. Output sound pressure level compensation for static pressure (atmospheric pressure) The output sound pressure generated by the NC-72B changes at a rate proportional to the static pressure (atmospheric pressure) (See “Reference” section on page 17). To determine the exact output sound...
  • Page 47 Specifi cations Specifi cations of supplied barometer Measurement range 905 hPa to 1055 hPa (90.5 kPa to 105.5 kPa) Dimensions 135 mm dia. × 45 mm (H) Weight 345 g Expanded measurement uncertainty 0.02 dB (0°C to +30°C)
  • Page 48 Specifi cations Supplied accessories Carrying case NC-72-210 1/2-inch adapter NC-72-S26 1/4-inch adapter NC-72-S27 Barometer Alkaline batteries (LR6) Instruction manual Calibration chart Inspection certifi cate...
  • Page 49 Specifi cations Unit:mm Dimensional drawings...
  • Page 50 No. 64382 21-09...

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