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34

Specifi cations

Output sound pressure level compensation for static (atmospheric) pressure

The output sound pressure generated by the NC-72A changes at a rate 

proportional to the static (atmospheric) pressure (See "Reference" 

section on page 17). To determine the exact output sound pressure 

level, the static pressure at the time of use should be measured, and 

compensation according to the specifi ed sound pressure level data 

given in the calibration chart should be applied.

Specifi cations of supplied barometer (compliance with class LS/C)

Measurement range

905 hPa to 1055 hPa (90.5 kPa to 105.5 kPa)

Ambient conditions for use

+16°C to +30°C

Dimensions 

135 (dia.) mm × 45 (H) mm

Weight 345 

g

Содержание NC-72A

Страница 1: ...3 20 41 Higashimotomachi Kokubunji Tokyo 185 8533 Japan http www rion co jp english INSTRUCTION MANUAL Pistonphone NC 72A...

Страница 2: ......

Страница 3: ...C 72A Main Unit External View Contains drawings that show the pistonphone from all sides Accessories External View Contains drawings that show the supplied accessories Names of Parts and Functions Ide...

Страница 4: ...ions and explains the influence of radio frequency fields Specifications Lists the technical specifications of the unit To conform to the EU requirement of the Directive on Waste Electrical and Electr...

Страница 5: ...nit or peripheral equipment make sure that all instructions are fully understood and observed Important These instructions are vital to prevent the possibility of damage to the prod uct or of performa...

Страница 6: ...rations or shock subject to air with high salt or sulphur content to gases or are in the vicinity of any substances that may adversely affect the unit outside of the specified temperature and humidity...

Страница 7: ...handle it carefully and do not subject it to shocks In order to maintain continued preciseness have the unit checked and serviced once per year Contact the supplier for the check When mounting and di...

Страница 8: ...ower supply section 6 Side view and top view 7 Operation 8 Inserting the batteries 8 Checking the battery voltage 10 Sound pressure measurement system sound level meter calibration 11 Using the microp...

Страница 9: ...y low time based variations which is capable of producing a sound of constant pressure and frequency unaffected by envi ronmental changes however compensation of the output sound pressure level for st...

Страница 10: ...2 NC 72A Main Unit External View 114dB 250Hz PISTONPHONE NC 72A dB JIS C 1515 2004 IEC 60942 2003 SOUND CALIBRATOR Class LS C and Class 1 C Sound Pressure Level Frequency 250 Hz Ser No...

Страница 11: ...ccessories External View NC 7 2 A r o F 2 S1 6 7 C N 1 2 inch adapter NC 7 2 A r o F 2 S0 6 7 C N 1 4 inch adapter R6P LR6 R6P LR6 R6P LR6 R6P LR6 R6P LR6 R6P LR6 Six IEC LR6 size AA batteries Baromet...

Страница 12: ...4 Accessories External View Carrying case Instruction manual this document INSTRUCTION MANUAL Pistonphone NC 72A...

Страница 13: ...ns 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 Never i...

Страница 14: ...rtment 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 ON OFF Po...

Страница 15: ...B JIS C 1515 2004 IEC 60942 2003 SOUND CALIBRATOR Class LS C and Class 1 C Sound Pressure Level Frequency 250 Hz Ser No Nominal sound pressure level Nominal frequency Sound pressure level indication S...

Страница 16: ...ng off 2 Insert six fresh IEC LR6 size AA batteries into the battery compartment with correct orientation as shown on page 9 The label in the battery compartment also indicates the polarity 3 Press th...

Страница 17: ...battery types To prevent the risk of battery fluid leakage that can cause corrosion and dam age be sure to remove the batteries from the unit when not using it Dispose of used batteries in accordance...

Страница 18: ...Unit cannot be used Lit Battery voltage normal Flashing Battery voltage low Unit can still be used Off When turning power to the unit on use the battery voltage monitor LED to check the state of the...

Страница 19: ...be measured 4 Carefully insert the microphone of the sound pressure measurement system sound level meter fully into the coupler of the pistonphone Important When inserting the microphone into the pist...

Страница 20: ...on of the microphone or the sound pressure measurement system sound level meter for more information 6 When the indication of the sound pressure measurement system sound level meter has stabilized rea...

Страница 21: ...in the supplied calibration chart At this time compensation for the microphone effective load volume and static atmospheric pressure is required For details see the Reference section pages 16 to 25 d...

Страница 22: ...istonphone 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...

Страница 23: ...f 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 pos sible After use be sure to rem...

Страница 24: ...e the exact output sound pressure level Change of output sound pressure level according to static atmospheric pressure The sound pressure p N m2 produced by the pistonphone changes at a rate proportio...

Страница 25: ...pressure 2 10 5 Pa The output sound pressure level L dB with compensation for static atmospheric pres sure is expressed by equation 3 Output sound pressure level L dB Ls 20 log10 Pa Po Equation 3 Pa...

Страница 26: ...hPa 90 5 kPa to 105 5 kPa Place the barometer on a level horizontal surface and lightly tap it with your fingertip to stabilize the needle When using the pistonphone read the current static atmospher...

Страница 27: ...tion chart For microphones not listed in the calibration chart the output sound pressure level from the load volume prechamber volume diaphragm equivalent volume can be calculated by using the equatio...

Страница 28: ...d attached 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 1 2 inch microphone Using 1 2 inch adapter NC 72 S16 UC 28 0 09 UC 30 0 09...

Страница 29: ...ensation value for reference Microphone type Change compensation value dB Remarks Tokyo Riko MR 103 0 24 1 inch microphone Tokyo Riko MR 103 without grid 0 12 B K 4160 without grid 0 12 B K 4180 0 00...

Страница 30: ...evel L dB is therefore obtained as follows 1 When specified sound pressure level Ls as per calibration chart is known Output sound pressure level L dB Ls 20 log10 Pa 101 325 Pa Static pressure at time...

Страница 31: ...ure at time of use kPa Static pressure used for reference 101 325 kPa Example Output sound pressure level L with UC 59 Specified sound pressure level Ls at reference conditions 114 05 dB example as pe...

Страница 32: ...eference conditions as per calibration chart dB Pa Static pressure at time of use kPa VL Effective load volume of microphone in use mm3 VA Effective load volume with 1 2 inch adapter or 1 4 inch adapt...

Страница 33: ...ssure level Ls at reference conditions 114 05 dB example as per calibration chart Static pressure at time of use Pa 98 8 kPa example measured with ba rometer at time of use Microphone effective load v...

Страница 34: ...ference orientation for testing effects of exposure to radio frequency fields Opposite side of microphone insertion opening see illustration below PISTONPHONE NC 72A Reference orientation for testing...

Страница 35: ...to 230 MHz 30 dB reference 1 V m or less Frequency range 230 MHz to 1 GHz 37 dB reference 1 V m or less The configuration for greatest radio frequency emissions power ON Immunity to electrostatic dis...

Страница 36: ...0 A m frequency 50 Hz and 60 Hz Output sound pressure level deviation when placed under the influence of radio frequency fields as specified below 0 30 dB or less Root mean square electric field stren...

Страница 37: ...LS1P compliant microphones IEC 61094 4 Type WS1P F D compliant microphones UC 25 UC 27 UC 34 1 2 inch microphones using 1 2 inch adapter NC 72 S16 IEC 61094 1 Type LS2aP compliant microphones IEC 610...

Страница 38: ...el 114 dB Specified sound pressure level As noted in supplied calibration chart 114 0 dB 0 2 dB at refer ence conditions Specified sound pressure level tolerance limit 0 15 dB Sound pressure level sta...

Страница 39: ...s THD total harmonic distortion of output sound pressure tolerance limit 2 5 or less 20 Hz to 20 kHz within rated ambient conditions for use Influence of static atmospheric pressure ambient temperatu...

Страница 40: ...supply Six IEC LR6 size AA alkaline batteries Power supply voltage Nominal 9 0 V Max 9 9 V Min 7 0 V Deviation from specified sound pressure level within rated power supply voltage range Within 0 05...

Страница 41: ...o 55 C Static atmospheric pressure 65 kPa to 108 kPa Relative humidity 10 to 90 no condensation Permissible ambient sound level 94 dB or less Electromagnetic compatibility EN 60942 2003 JIS C 1515 200...

Страница 42: ...17 To determine the exact output sound pressure level the static pressure at the time of use should be measured and compensation according to the specified sound pressure level data given in the calib...

Страница 43: ...Supplied accessories Carrying case NC 72 053 1 1 2 inch adapter NC 72 S16 1 1 4 inch adapter NC 72 S06 1 Barometer 1 IEC LR6 size AA alkaline battery 6 Instruction manual 1 Calibration chart 1 Inspect...

Страница 44: ...pecifications Unit mm Dimensional Drawings 114dB 250Hz PISTONPHONE NC 72A dB JIS C 1515 2004 IEC 60942 2003 SOUND CALIBRATOR Class LS C and Class 1 C Sound Pressure Level Frequency 250 Hz Ser No 62 44...

Страница 45: ......

Страница 46: ...No 51693 15 11...

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