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16

Chapter 5

Connectin the Nor1216 to Sound Analyser Nor140

To activate the System Check push SETUP – 1 (Instru-
ment menu) – 9 (Misc. Parameters) – 7 (Microphone
check)

NOTE:

Please note that the System

Check signal must be deactivated when
you want to calibrate the microphone
with an acoustical calibrator. Unless de-

activated, you will read unstable values due to
the interference between the System Check sig-
nal and the signal from the sound calibrator.

Switch the menu point “Chk signal:” ON.

This will activate the calibration tone (1KHz – 1Vrms)
each time you enter the calibration function.

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Содержание nor1217

Страница 1: ...INSTRUCTION MANUAL Outdoor microphone nor1217 ...

Страница 2: ......

Страница 3: ...Outdoor microphone nor1217 ...

Страница 4: ...thermore Norsonic AS assumes no responsibility for any infringement of the intel lectual property rights of third parties wherever applicable which could result from such use Norsonic AS reserves the right to amend any of the informa tion given in this manual in order to take account of new developments If you wish to communicate with us please feel welcome Our address is Norsonic AS P O Box 24 N ...

Страница 5: ...7 Frequency response 9 Self noise 10 Cables and cable length 11 Directional response 12 Frequency response 13 Self noise and wind 14 Chapter 5 Connecting the Nor1217 to Sound Analyser Nor140 15 Chapter 6 Maintenance 17 Chapter 7 Specifications 18 Mounting direction 18 Acoustic performance 18 General 18 Frequency response 18 Directional response 18 General 18 Conformity 19 Protection provided by th...

Страница 6: ......

Страница 7: ...n system The reference direction may however be selected to be vertical or horizontal based on the applied frequency response compensation in the sound level meter The outdoor microphone may be calibrated with a normal sound calibrator suitable for working stand ard microphones WS2 and without the need for extra accessories Access to the microphone cartridge is easily gained by dismounting the upp...

Страница 8: ... lit tle water which is very important in order to retain high insulation in all weather conditions The mantle is made of polyurethane to ensure a robust cable yet flexible at low temperatures Birdspike Wind dust and water protection Upper part Microphone cartridge Microphone preamplifier Nor1209 Base Connector cable Optional tripod adaptor with tension relief O ring NOTE You need to use the A ver...

Страница 9: ...ivemast and to ground it properly A rod in proper con tact with the conductive mast should be made at the side and 50 cm above the tip of the microphone The rod should be placed at least 25 cm to the side of the microphone assembly and have a diameter not more than 10 mm in order not to interfere with the directional properties of the microphone Safety considerations may require the screen of the ...

Страница 10: ...g 113 9 dB for Nor1251 calibrator with a stated level of 114 dB This is only valid if the frequency response correc tion is turned off For the Nor140 the frequency cor rection is turned off when entering into the calibration menu Perform calibration and calibrate the micro phone as a normal free field microphone I E 0 1 dB if using a 1000 Hz calibrator When leaving the cali bration menu you will o...

Страница 11: ...reen rain hood dust mesh and birdspike and pro tects the microphone from rain snow dust and insects Both the rain hood and the dust mesh are made of a water repellent fabric open for the sound The sound is reaching the microphone through nine slots placed equidistantly around the circumference of the circular body of the upper part The mechanical part with the birdspike is also important for the d...

Страница 12: ... for the sound level meter see Specifications Based on the correction the reference direction may be selected to be either horizontal or vertical Horizon tal reference direction is usually selected for sound approaching the microphone mainly along a horizon tal axis like noise from industry or vehicles A vertical reference axis is usually used for measuring the noise from aircraft The sound analys...

Страница 13: ...ut Not connected Power supply Power supply 5 6 1 4 3 7 2 V NC System check Output Heater resistor Vpol V GND System check The system check terminal pin 1 shall be termi nated to signal ground or the signal output when the microphone system is in normal use For checking the system a test signal may be supplied e g an AC sig nal of 1 volt 1000 Hz The signal is transmitted to the preamplifier input t...

Страница 14: ...d by a change in the mi crophone capacitance A very low signal is returned in case of a short circuit in the microphone A 200 V polarised microphone will show approxi mately 2 dB higher level if the 200 V disappear due to the lost tension and thereby decreased capacity in the diaphragm when the 200 V is off The sound analyser Nor140 has a build in signal generator that delivers the required signal...

Страница 15: ...l frequency response for the preamplifier Nor1209A Frequency response The typical frequency response for the preamplifier Nor1209 is shown below The frequency response for the outdoor microphone system is therefore mainly de termined by the microphone cartridge and the acous tic performance of the enclosure ...

Страница 16: ...hone is substi tuted by an 20 pF capacitor is shown on the graph be low 0 dB corresponds to 1 µV For a microphone with a sensitivity of 50 mV Pa Nominal value of Nor1225 Nor1227 0 dB voltage also corresponds to the normal reference pressure for sound 20 µPa and the noise level may be compared with sound pressure level di rectly Typical self noise of the microphone system when the microphone is sub...

Страница 17: ... the length of the cable A typical value for microphone cables from Norsonic is 120 pF per metre Hence a cable with length 100 m will load the output with a capacitance of 12 nF For lower fre quencies there are seldom problems with long cables However when the signal contains the combination of high amplitude and high frequency the capacitive loading will lead to high output current A limited cur ...

Страница 18: ...ce limits for the directional response The directional response of a microphone is the ratio of the free field response at a particular frequency as a function of angle of sound incidence to the response in the reference direction The upper adjacent figure shows the directional re sponse for Nor1217 when the reference axis is verti cal for the frequencies 1000 Hz 4000 Hz and 8000 Hz IEC 61672 1 sp...

Страница 19: ...nse to ensure that the response is within the requirement for Class 1 sound level meters specified in the international standard IEC 61672 1 10 100 1k 10 k 20 k 30 25 20 15 10 5 0 5 10 Vertical Horizontal Sensitivity level dB Frequency Hz When the microphone system is used in connection with the precision sound analyser Nor140 for program version 3 0 and above just select 1214 1216 1217 Vertical o...

Страница 20: ...y The levels are measured without frequency compensation The correspond ing A weighted levels are 16 dB 40 dB and 48 dB Depending on the wind speed the noise levels are typically 20 dB to 30 dB lower than for an unprotected microphone 0 10 20 30 40 50 60 70 80 90 6 3 8 10 12 5 16 20 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1 k 1 25 k 1 6 k 2 k 2 5 k 3 15 k 4 k 5 k 6 3 k 8 3 k 10...

Страница 21: ...tion applied and 1214 16 17 Horizontal for Nor1217 with horizontal frequency cor rection applied If the Nor1227 is used as microphone cartridge the polarization voltage should be set to OFF Set it to ON if Nor1225 is used It is not needed to do any settings in the 2 corrections in this menu This is all pre set when selecting the 1217 as transducer The point 1 Level range should not be used unless ...

Страница 22: ...em Check signal must be deactivated when you want to calibrate the microphone with an acoustical calibrator Unless de activated you will read unstable values due to the interference between the System Check sig nal and the signal from the sound calibrator Switch the menu point Chk signal ON This will activate the calibration tone 1KHz 1Vrms each time you enter the calibration function ...

Страница 23: ... part is lifted upward en sure that the lower part stay fixed otherwise the rain hood above may be harmed The outer part of the windscreen may be cleaned by washing by hand using standard household wash ing up detergents Ensure that it has been thoroughly rinsed in clean water and is completely dry before it is remounted Do not use excessive heat for the drying 85ºC maximum However we recommend to...

Страница 24: ...eighted 22 dB re 20 µPa 22 5 Hz 22 5 kHz Frequency response See Technical description Frequency correction is recommended for conform ance with the requirements in IEC 61672 for class 1 sound level meters Directional response The directional response satisfies the requirements for a Class 1 sound level meter according to IEC61672 1 See section 4 4 Directional response for further infor mation Gene...

Страница 25: ...e satisfies the requirements for Ingress Protection Category IP55 according to IEC 60529 DnV report No 2009 3124 Accessories and spare parts Windshield upper part Norsonic part no Nor4529 Assembled upper part with windscreen Norsonic part no Nor4560 Microphone Nor1227 or Nor1225 Microphone preamplifier Nor1209 Sound calibrator Nor1251 or Nor1253 Microphone cable Nor1408A Standard lengths 5 10 15 2...

Страница 26: ......

Страница 27: ...e IEC60529 IP55 EMC EN 6100 6 3 2007 EN 6100 6 2 2005 Sound Applicable parts of IEC61672 1 Configuration for test Connected to Nor140 sound level meter This product has been manufactured in compliance with the provisions of the relevant internal Norsonic production standards All our products are tested individually before they leave the factory This Declaration of Conformity does not affect our wa...

Страница 28: ...r acoustics from sound calibrators micro phones and preamplifiers via small handheld sound level meters to advanced yet portable real time analysers but also building acoustics analysers and complete community industry and airport noise monitoring systems Contact your local representative or the factory for information on our complete range of instrumentation ...

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