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Rion NC-74, Instruction Manual

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Rion NC-74 Instruction Manual Download Page 22

10

Measurement

7.  Adjust the sound level meter so that its level reading is 94 dB (calibration value, see 

Note below).

Note

Depending on sound level meter model and type, there may be 
deviation of 0.1 to 0.5 dB, due to the infl uence of case refl ections 
and the microphone diffraction effect.
For details on precise calibration values, please refer to the "Ref-
erence" section on page 11 or to the documentation of the sound 
level meter.

8.  When level adjustment is completed, set the power switch of the sound level meter 

and the NC-74 to OFF.

9.  Carefully remove the microphone of the sound level meter from the NC-74 (see 

the “Important” on page 7).

Summary of Contents for NC-74

Page 1: ...3 20 41 Higashimotomachi Kokubunji Tokyo 185 8533 Japan http www rion co jp english INSTRUCTION MANUAL Sound Calibrator NC 74 ...

Page 2: ......

Page 3: ...sic information on the unit Controls and Features Briefly identifies and explains all parts of the unit Preparations Describes how to insert batteries and use the adapter Measurement Describes the basic steps and procedures for measurement Reference Describes the calibration values for sound level meter and sound calibrator Also describes effects of exposure to radiofrequency fields Specifications...

Page 4: ...d in this manual are usually trade marks or registered trademarks of their respective owners To conform to the EU requirement of the Directive on Waste Electri cal and Electronic Equipment the symbol mark on the right is shown on the instrument ...

Page 5: ...risk of 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 the product Mentioned about the tips to use this unit properly This messages do not have to do with safety Note ...

Page 6: ...iv ...

Page 7: ...ations or shock subject to air with high salt or sulphur content or to gases or are in the vicinity of stored chemicals outside of the specified temperature and humidity range subject to drastic temperature changes and to condensation Store the unit in the desiccator in locations subject to high temperatures and high hu midity Do not use the unit for any purpose other than calibrating sound level ...

Page 8: ... not subject it to shocks When not using the unit always store it in its soft case for protection 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 The unit does not contain any substances harmful to the environment Treat the unit as non combustibl...

Page 9: ...er Do not use solvents or alcohol based cleaners When mounting and dismounting the microphone and sound calibrator do not rotate the sound level meter or sound calibrator Otherwise the protective grid of the microphone may become loose or detached causing damage to the microphone diaphragm ...

Page 10: ...viii ...

Page 11: ...d Features 2 Preparations 4 Inserting the Batteries 4 Using the 1 2 inch Microphone Adapter NC 74 002 6 Measurement 7 Reference 11 Sound level meter and sound measurement system calibration value 11 Electromagnetic Compatibility 16 Specifications 19 ...

Page 12: ...x ...

Page 13: ...1 Outline The NC 74 is a compact lightweight easy to use sound calibrator It conforms to IEC 60942 2003 Class 1 specifications and can be used to calibrate class 1 and class 2 sound level meters ...

Page 14: ... is inserted here Case top Separate from the case bottom by simultaneously pressing the two sections marked PUSH See illustration on page 4 Coupler 1 2 inch microphone adapter NC 74 002 Case top Case bottom LED Power switch M A D E IN J A P A N R IO N C O L T D S E R N o M O D E L N C 7 4 ...

Page 15: ...size AA alkaline batteries are inserted here LED 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 74 002 Use this adapter when the outer diameter of the microphone is 1 2 inch ...

Page 16: ... PUSH and pull ing the case top off the case bottom 2 Insert two IEC LR6 size AA alkaline batteries with correct polarity 3 Snap the case top onto the case bottom again PUSH Press the PUSH sections on both sides and open the case IE C 6 0 9 4 2 2 0 0 3 IEC 6094 2 20 03 IE C 60 94 2 20 03 ...

Page 17: ...on as shown on the preceding page The polarity is also marked inside the battery wells Do not mix old and new batteries Do not mix different types of batteries Always remove the batteries when not using the unit Dispose of used batteries in accordance with local laws and regulations ...

Page 18: ...h microphone adapter NC 74 002 When the microphone diameter is 1 2 inches the adapter must be in place Important Insert the 1 2 inch microphone adapter NC 74 002 fully into the coupler Otherwise correct calibration is not possible 1 2 inch microphone adapter NC 74 002 M A D E IN J A P A N R IO N C O LT D S E R N o M O D E L N C 7 4 ...

Page 19: ...calibrator Important The microphone of the sound level meter must always be inserted or removed slowly and carefully to avoid the pos sibility of damage to the microphone diaphragm caused by abrupt changes in air pressure When mounting and dismounting the microphone and sound calibrator do not rotate the sound level meter or sound calibrator Otherwise the protective grid of the microphone may beco...

Page 20: ...sure inside the sound calibrator will lead to false readings thereby preventing correct calibration The time required until the air pressure inside the sound calibrator stabilizes is 30 seconds or less The time required until the air pressure inside the microphone itself stabilizes depends on the microphone type Check the docu mentation of the microphone or the sound level meter 4 Select the measu...

Page 21: ... are totally exhausted the LED will not light at all The batteries must be replaced immediately 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 influence on the measurement and correct calibration wil...

Page 22: ...e influence of case reflections and the microphone diffraction effect For details on precise calibration values please refer to the Ref erence section on page 11 or to the documentation of the sound level meter 8 When level adjustment is completed set the power switch of the sound level meter and the NC 74 to OFF 9 Carefully remove the microphone of the sound level meter from the NC 74 see the Imp...

Page 23: ... tables Table 1 and 2 These values were derived taking into consideration the relationship between the sound pressure level at the microphone in the coupler specified sound pressure level and the influence of case reflections and the microphone refraction effect when placed in a sound field Example For the sound level meter NL 21 the calibration value as shown in Table 1 is 93 9 dB Set the NC 74 t...

Page 24: ...93 9 UC 52 93 9 Table 1 Model Microphone Calibration value dB NA 16 NA 16A NA 25 NA 27 UC 53A MS 10 94 0 93 9 UC 53A 94 0 UC 53A 94 0 NA 40 UC 27 93 8 NA 29E UC 53A 94 0 NA 41 UC 34 93 8 NA 28 UC 59 94 0 NA 60 NA 61 NA 82A NL 10A NL 11 NL 14 NL 15 NL 16 NL 18 UC 26 93 9 UC 26 93 9 MS 10 93 9 UC 26 93 9 UC 26 93 9 UC 53A 94 0 UC 53A 94 0 UC 53A 94 0 UC 53A 94 0 NL 32 UC 53A 94 0 NL 31 UC 53A 94 0 M...

Page 25: ...alues for Microphones 1 2 inch UC 11 UC 27 UC 25 UC 34 UC 26 UC 30 UC 31 UC 52 UC 53A 93 8 93 8 93 5 93 8 93 9 94 0 93 9 93 9 94 0 Nominal outer diameter Model 1 inch Calibration value dB Table 2 MS 10 93 9 UC 57 94 1 UC 59 94 0 ...

Page 26: ...alues for various microphone models designated microphones please refer to Table 3 see page 15 For microphones not listed in this table you can calculate the sound pressure level from the load volume front cavity volume diaphragm equivalent volume using the equation given below approximate value 1 inch microphone Sound pressure level dB 94 00 VL 1025 0 00072 1 2 inch microphone Sound pressure leve...

Page 27: ... 94 16 4180 Table 3 without protective grid without protective grid with protective grid with protective grid with protective grid with protective grid with protective grid with protective grid with protective grid with protective grid with protective grid with protective grid with protective grid with protective grid with protective grid 94 05 UC 57 94 02 UC 59 94 00 94 00 Specified Microphones a...

Page 28: ...r testing effects of exposure to radiofrequency fields Opposite side of microphone insertion opening see illustration below Reference orientation for testing effects of exposure to radiofrequency fields M A D E IN J A P A N R IO N C O L T D S E R N o M O D E L N C 7 4 ...

Page 29: ...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 configuration for greatest radiofrequency emissions power ON Immunity to electrostatic discharges No malfunction after the following electrostatic discharge tests Contact discharge up to 4 kV versus ground potential Non contact discharge up to 8 kV versus ground potential ...

Page 30: ...ectromagnetic fields as specified below within 0 3 dB Electromagnetic field strength up to 10 V m rms non modulated frequency range 26 MHz to 1 GHz 900 Hz sinusoidal wave 80 amplitude modulation AC magnetic field strength up to 80 A m rms frequency 50 Hz and 60 Hz The configuration that produce minimum immunity maximum susceptibility to power frequency magnetic fields and radiofrequency electromag...

Page 31: ...e LS1P UC 27 UC 11 UC 25 UC 34 1 2 inch microphones IEC 61094 1 Type LS2aP UC 53A UC 52 UC 26 UC 30 UC 31 UC 33P UC 57 UC 59 Using 1 2 inch microphone adapter NC 74 002 Reference conditions Ambient temperature 23ºC Static pressure 101 325 kPa Relative humidity 50 Effective load volume of a microphone 1025 mm3 total coupler volume 12004 mm3 typical value ...

Page 32: ...ation After power on 5 seconds or less After microphone insertion 30 seconds or less Sound pressure level stability short term fluctuations 0 1 dB within ambient conditions for operation 20 s Time Weighting F IEC 61672 1 2002 Nominal frequency 1000 Hz Specified frequency 1000 Hz Frequency tolerance 1 0 at reference conditions Frequency stabilization duration After power on 5 seconds or less ...

Page 33: ...pressure ambient temperature and humidity at ambient ratings given below Sound pressure level deviation from value for reference conditions within 0 4 dB Frequency deviation from value for reference conditions within 1 0 Ambient ratings Ambient temperature 10 to 50ºC Static pressure 65 to 108 kPa Relative humidity 25 to 90 RH 1 2 inch microphone adapter supplied accessory Model designation NC 74 0...

Page 34: ...ecified sound pressure level deviation within power supply voltage range Max 0 1 dB from specified sound pressure level at nominal power supply voltage reference conditions Battery life 30 hours minimum using two LR6 batteries at reference condi tions Ambient conditions for storage 20 to 60ºC no condensation Ambient conditions for operation Ambient temperature 10 to 50ºC Static pressure 65 to 108 ...

Page 35: ...atteries Atmospheric pressure compensation The NC 74 automatically compensates for sound pressure fluctuations caused by changes in static pressure Sound pressure level devia tion between 65 and 108 kPa is within 0 3 dB from the value for 101 325 kPa Supplied accessories Soft case 1 IEC LR6 size AA alkaline battery 2 1 2 inch microphone adapter NC 74 002 1 Instruction manual 1 Inspection certifica...

Page 36: ...24 Specifications Unit mm Dimensional Drawings 1 2 inch microphone adapter NC 74 002 49 44 74 80 ...

Page 37: ......

Page 38: ...No 32263 14 08 ...

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