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Content

Chapter 6

Specifications .....................................................................................................19

Mounting direction ........................................................................................................................ 19
Acoustic performance .................................................................................................................. 19

General .................................................................................................................................... 19
Frequency response .............................................................................................................. 19
Directional response .............................................................................................................. 19

General ........................................................................................................................................... 19
Conformity ..................................................................................................................................... 20
Protection provided by the enclose ........................................................................................... 20
Accessories and spare parts ...................................................................................................... 20

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Содержание nor1216

Страница 1: ...INSTRUCTION MANUAL Outdoor microphone nor1216 ...

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Страница 3: ...Outdoor microphone nor1216 ...

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: ...ration 4 Chapter 3 Technical description 5 Electrical description 6 System check 8 Frequency response 9 Self noise 10 Cables and cable length 11 Directional response 12 Frequency response 13 Self noise and wind 14 Chapter 4 Connecting the Nor1216 to Sound Analyser Nor140 and Sound Vibration Analyser Nor150 15 Connecting to Nor140 16 Connecting to Nor150 17 Chapter 5 Maintenance 18 ...

Страница 6: ...r 6 Specifications 19 Mounting direction 19 Acoustic performance 19 General 19 Frequency response 19 Directional response 19 General 19 Conformity 20 Protection provided by the enclose 20 Accessories and spare parts 20 ...

Страница 7: ...Outdoor microphone nor1216 ...

Страница 8: ......

Страница 9: ...phone may be calibrated with a normal sound calibrator suitable for working standard microphones WS2 and without the need for extra accessories Access to the microphone cartridge is easily gained by dismounting the upper part of the outdoor microphone The base of the Nor1216 is made of an electrical insulat ing material The microphone body will be fully insulated from the mounting mast thereby red...

Страница 10: ...ble yet flexible at low tem peratures If you need weather protected connectors we recommend cable type Nor1485 Unscrew and remove the upper part of the microphone consisting of birdspike and windscreen as one unit Do not remove the windscreen from this upper part as this may destroy the weather protection and alter the acoustic performance Pull up the assembly of microphone cartridge and preamplif...

Страница 11: ...ement Grounding and lightning protection If the outdoor microphone assembly is the highest ob ject in the vicinity when mounted it may be exposed to lightning strokes We recommend to use a conductive mast 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 sid...

Страница 12: ...hone cartridge Mount the calibra tor slowly and carefully while turning the calibrator and switch it on See figure If the calibrator frequency is 250 Hz adjust the reading to be the level stated for the calibrator e g 124 0 dB for Nor1253 with 124 dB specified level If the calibrator frequency is 1000 Hz adjust the reading to be 0 1 dB below the stated calibrator level e g 113 9 dB for Nor1251 cal...

Страница 13: ...t mesh and birdspike and protects 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 parts with the birdspike is also important for the directional respons...

Страница 14: ... disassembled in the field the performance may be reduced due to contamination from dust and humidity When Nor1216 substitute a normal measurement microphone on a sound level meter a correction of the frequency response is normally needed to retain the class of accuracy for the sound level meter see Speci fications Based on the correction the reference direc tion may be selected to be either horiz...

Страница 15: ...d with the microphone Nor1225 1 2 3 4 5 7 6 Signal ground Polarization voltage Signal output Not connected Power supply Power supply 5 6 1 4 3 7 2 V NC System check Output Heater resistor Vpol V GND NOTE Nor140 with serial number below 1405079 must be upgraded in order to deliver the required current for the heater resistor which is used in Nor1216 to rise the temperature of the microphone and pre...

Страница 16: ...ophone cartridge with a nominal capacitance of 18pF A typical level for the returned signal is 45 mV with an excitation of 1 volt corresponding to a sound level of 92 95 dB dependant of the microphone cartridge ca pacistance The signal may be used for verification of correct operation of the cable and preamplifier Even a malfunctioning microphone may be detected since this is normally accomplished...

Страница 17: ...pical frequency response for the preamplifier Nor1209A Frequency response The typical frequency response for the preamp lifier is shown below The frequency response for the outdoor microphone system is therefore mainly deter mined by the microphone cartridge and the acoustic performance of the enclosure ...

Страница 18: ...one is substitut ed by an 20 pF capacitor is shown on the graph above 0 dB corresponds to 1 µV For a microphone with a sensitivity of 50 mV Pa Nominal value of Nor1227 or Nor1225 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 su...

Страница 19: ...th 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 frequencies 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 20: ...nse The directional response of a microphone is the ra tio of the free field response at a particular frequency as a function of angle of sound incidence to the re sponse in the reference direction The upper adjacent figure shows the directional re sponse for Nor1216 when the reference axis is verti cal for the frequencies 1000 Hz 4000 Hz and 8000 Hz IEC 61672 1 specifies tolerance limits for any ...

Страница 21: ...0 5 10 Vertical Horizontal Sensitivity level dB Frequency Hz Due to the lower sensitivity for higher frequencies as shown on the figure it is recommended to correct the frequency response to ensure that the response is within the requirement for Class 1 sound level meters specified in the international standard IEC 61672 1 When the microphone system is used in connection with the precision sound a...

Страница 22: ...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 23: ...onsuming more current than can be sourced from the Nor140 power when powered with the internal batteries Hence The Nor140 should al ways be powered from an external DC source such as a car battery or the Mains Adapter Nor340 when connected to a Nor1216 Using the internal batteries may increase the self noise level resulting in wrong measurement results NOTE Nor140 with serial number below 1405079 ...

Страница 24: ...s de activated you will read unstable values due to the interference between the Sytem Check signal and the signal from the sound calibrator It is not needed to do any settings in the 2 corrections in this menu This is all preset when selecting the 1216 as transducer The point 1 Level range should not be used unless high levels above 140dB need to be measured This requires the use of the Nor1225 w...

Страница 25: ... spectrum Once you have selected capsule type a list of preamp lifier data have to be entered Enter Serial number and Gain Gain is the attenuation in the preamplifier You may leave this to 0 and adjust the overall sensitivity by an acoustical calibrator to correct reading However it is recommended to use a value to have a better match between the verified sensitivity given in the microphone capsul...

Страница 26: ...ifted 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 replace t...

Страница 27: ... 22 5 kHz Frequency response See Technical description Frequency correction is recommended for conformance 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 General Mounting on a pole 1 thread ...

Страница 28: ...with the following standards EN 50081 1 EN 50082 1 Protection provided by the enclose The microphone 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 preamplifi...

Страница 29: ...21 Norsonic Nor1216 Instruction Manual ...

Страница 30: ......

Страница 31: ...f IEC 61672 1 when combined with Nor140 equipped with software version 2 0 and upwards as well as Nor150 V1 2 Ingress Protection Category IP55 according to IEC 60529 DnV report No 2009 3124 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 test...

Страница 32: ...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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