Norsonic nor1217 Instruction Manual
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Norsonic nor1217, 21 Norsonic Nor1217 Instruction Manual 2121 Declaration of Conformity We, Norsonic AS, Gunnersbråtan 2, Tranby, Norway, declare under our sole responsibility that the product: Outdoor microphone Nor1217 to which this declaration relates, is in conformity with the following standards or other normative documents: Safety: EN61010-1: February 2001 for portable equipment and pollution degree 2. Enclosure IEC60529 - IP55 EMC: EN 6100-6-3; 2007 EN 6100-6-2; 2005 Sound: Applicable parts of IEC61672-1 Conguration fo
9 Norsonic Nor1217 Instruction Manual 0.1 1 10 100 Frequency [Hz] 1k 10k 100k 8 7 6 5 4 3 2 1 0 1 2 dB Typical 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 microph
Norsonic nor1217, 15 Norsonic Nor1217 Instruction Manual Connecting the Nor1217 to Sound Analyser Nor140 The Nor1217 is designed to be used with the Sound Analyser Nor140. The Nor140 supports all the needed corrections, system check facilities for the two types of microphones. This chapter discuss how you set up and use the Nor140. In the SETUP – 1 (Instrument menu) – 4 (Input menu), you select which type transducer you have connected. Select either “1214/16/17 Vertical” for Nor1217 with vertical frequency correct
Norsonic nor1217, 3 Norsonic Nor1217 Instruction Manual Unscrew and remove the upper part 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. The unit is delivered with an adaptor for mounting on a tripod. The cable is led through a slot in the side of the adaptor. The base screw has a threaded hole like those commonly used for cameras (3/8” UNC). The base screw also forms a tension relief for the cable. Remove the base screw and slide the cable through the base unit. Assemble the microphone cartridge to
Norsonic nor1217, 4 Chapter 3 Microphone calibration Microphone calibration The Nor1217 can be calibrated with a sound calibra- tor for ½” microphones without the need for special couplers. We recommend using Nor1251 (1000 Hz) or Nor1253 (250 Hz). Unscrew the upper part of the microphone to gain access to the microphone cartridge. Mount the cali- brator 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 calibr
Norsonic nor1217, 12 Chapter 4 Technical description 100 10 k 20 k 1 k 0 1 2 3 4 Frequency [Hz] +/- 30 deg – Horizontal reference Directional response An outdoor microphone system like Nor1217 may form a part of a sound level meter when applied for environmental noise monitoring. The combination of microphone and instrument shall therefore satisfy all requirements in the international standards for sound level meters, specified in IEC 61672-1. The Nor1217 in combination with Nor140 is type approved by PTB, Germany. Ideally, the microphone shall have the same sensitivity for sound from any direction. The
Norsonic nor1217, 19 Norsonic Nor1217 Instruction Manual 1919 Conformity The microphone satisfy the requirements for a Class 1 sound level meter according to IEC 61672-1 when combined with Nor140 equipped with software version 3.0 and upwards – or other suitable instrument. The device is in conformity 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 Microphon
13 Norsonic Nor1217 Instruction Manual Frequency response The figure below shows the typical frequency re- sponse for sound approaching the microphone in two directions. The response marked “Vertical” is the re- sponse for sound approaching the microphone from above along the bird spikes, when the microphone is in the recommended vertical direction. The response marked “H
Norsonic nor1217, 8 Chapter 4 Technical description 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 capacitance. 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 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 diaphra
Norsonic nor1217, 10 Chapter 4 Technical description -10.0 -5.0 0.0 5.0 10.0 15.0 20.0 6.3 Hz 8.0 Hz 10 Hz 12.5 Hz 16 Hz 20 Hz 25 Hz 31.5 Hz 40 Hz 50 Hz 63 Hz 80 Hz 100 Hz 125 Hz 160 Hz 200 Hz 250 Hz 315 Hz 400 Hz 500 Hz 630 Hz 800 Hz 1.0 k 1.25 k 1.6 k 2.0 k 2.5 k 3.15 k 4.0 k 5.0 k 6.3 k 8.0 k 10.0 k 12.5 k 16.0 k 20.0 k A C Frequency [Hz] / Network Level [dB] Self-noise The electrical noise when the microphone is substi- tuted by an 20 pF capacitor is shown on the graph be- low. 0 dB corresponds to 1 µV. For a micropho
Norsonic nor1217, Nor1217 – User Guide Im1217_1Ed1R1En – November 2013 edition Norsonic is a registered trademark of Norsonic AS. Every effort has been made to supply complete and ac- curate information. However, Norsonic AS assumes no responsibility for the use of – or for the consequential dam- age resulting from the use of – this information and/or the instrumentation described herein. Furthermore, 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 ac
Norsonic nor1217, 14 Chapter 4 Technical description Self-noise and wind The figure below shows typical self-noise for the mi- crophone system as levels for the various 1/3-octave frequency bands re. 20 µPa when the microphone is placed in a horizontal, laminar flow of air with speed 0, 5 and 10 m/s, respectively. 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 unpro
Norsonic nor1217, 7 Norsonic Nor1217 Instruction Manual The supply voltage will affect the maximum sound pres- sure that can be measured. For ±15 V or +30 V supply, the maximum peak value exceeds 10 volt corresponding to 140 dB peak sound pressure level for the Nor1227 / Nor1225 microphone cartridge (50mV/Pa). By the use of the “high level” option in Nor140, signals with peak values up to 150 dB may be measured with the microphone cartridge Nor1225. The figure below shows a simplified electrical circuit diagram of the complete outdoor microphone. The microphone cartridge is connected to the preamp
Norsonic nor1217, 11 Norsonic Nor1217 Instruction Manual 140 130 120 110 100 90 10 m 50 m 100 m20 m 200 m 500 m 20 kHz 10 kHz 5 kHz dB Cable length (120 pF/m) Level Cables and cable length The Nor1217 with its preamplifier Nor1209 has excel- lent driving capability for long cables. The signal output from the microphone preamplifier will be loaded by the capacitance of the cable between the microphone sys- tem and the instrument. The capacitance will increase proportionally with the length of the cable. A typical value f
Norsonic nor1217, 2 Chapter 2 Assembling Assembling The outdoor microphone Nor1217 normally shipped without preamplifier and microphone, since these parts is normally taken from the Nor140 Sound Analyser. Depending on the application, you will need a mast or tripod for mounting the microphone system and possibly devices for proper grounding and lightning protection, see below. We recommend cable type Nor1408A, which comes in standard lengths of 5, 10, 15, 20, 30 and 50 metres – other lengths are available on request. This cable is Teflon®-insulated and hence absorbs very lit- tle water, which is very important in order to retain high insulation in all weather cond
17 Norsonic Nor1217 Instruction Manual 1717 Maintenance The need for maintenance depends largely on the environmental conditions where the microphone sys- tem is used. Contamination of dust, ice or snow on the windscreen may alter the acoustic performance. For most applications, it will be sufficient to check the microphone periodically by using the system check facility, e.g. every night. Fo
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