Nor-211A User Manual - Campbell Associates
Contents
1. user documentation nor211A The Nor 211A is a mains oper ated tapping machine with op tional battery operation designed to meet the requirements given in ISO 140 parts 6 and 7 stating that a tapping machine is needed as sound source for im pact noise measurements Although the tapping machine comes with steel hammers as standard a rubber hammer ver sion retrofit is also available For convenience a remote on off control is available as an option tapping machine CE l Im211A_1Ed1R2En May2004 NN Norsonic Nor 211A User Guide Im211A_1Ed1R2En May 2004 Edition Production Notes This manual was created electronically using Adobe PageMaker 6 5 Artworks were made with Adobe PhotoShop 5 5 and FreeHand 8 Proofs were made on HP LaserJet 4050PS and 4MV PostScript printers RIP and final printout were made at Allkopi H vik Norway Norsonic is a registered trademark of Norsonic AS All other brand or product names are trademarks or registered trademarks of their re spective companies Every effort has been made to supply com plete and accurate information However Nor sonic AS assumes no responsibility for the use of nor for the consequential damages of the use of this information and or the instrumen tation described herein Furthermore Norsonic AS assumes no responsibility for any infringe ment of the intellectual property rights of third parties wherever applicable which woul2. The rubber hammers are mounted on a bracket on the end panel of the machine The replaced set of hammers fit on the same bracket The two types of hammers are of the same length However we still recommend that you verify the fall height after hammer replacement Use the pin and the wrench when unscrewing a hammer Give the pin a quick push rather than slowly un screwing to avoid pin deformation LED Start button The remote control unit Caution The mains switch shall always be set to Off upper position when the unit is not in use or when charging batteries or when the fall height of the hammer is adjusted or other adjustments are done Operation In its standard version the unit is operated off mains but the units equipped with option 211A 01 can also be battery operated by means of a build in battery This option cannot be installed as a ret rofit When connected to mains a green LED is lit The mains switch has three positions off ready and start stop The switch shall always be set to off upper posi tion for safety reasons when the unit is not in use or when the fall height of the hammer is adjusted or other adjustments are done The middle position ready enables the unit to receive signals from the remote control unit optional A green LED is lit when the switch is set to ready mode If the LED is red batteries optional need recharging Push down the mains but
3. Machine NOR 211A FROM SERIAL NUMBER 18220 to which this declaration relates is in conformity with the following standards or other normative documents Safety EN61010 1 1993 for portable equipment and pollution category 2 EMC EN 50081 1 EN 50082 1 following the provisions of the LVD EMC and Machine Directive 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 warranty obligations Tranby January 1996 agfinn Jahr Quality Manager The declaration of conformity is given according to EN 45014 and ISO IEC Guide 22 Norsonic AS P O Box 24 N 3420 Lierskogen Norway
4. chine Nor 211A has been designed to fulfil ISO 140 parts 6 and 7 This Standard requires a tapping machine as sound source for impact noise measure ments The requirements are as follows e The tapping machine should have five hammers placed in a line spanning 400 mm e The time between successive impacts should be 100 ms 5 ms e The effective mass of each hammer should be 0 5 kg within 2 5 e The dropping of a hammer on a flat floor should be equivalent with re spect to the momentum to a free frictionless drop of 40mm within 2 5 e The part of the hammer that strikes the floor should be a cylinder made of brass or steel 3 cm in diameter with a spheri cal end having a radius of 50 cm The Nor 211A has been designed to meet these requirements The Nor 211A 02 has been further extended to also meet the re quirements for rubber coated hammers to be used on delicate floors These rubber coated hammers are however easy to re place with conventional steel hammers as described later in this manual Detach this rod and use it to check the fall height of the hammers see text for details The feet are locked in position by means of the screw and the nut Fall Height Adjustments Before you make measurements with your Nor 211A the fall height of all the hammers should be checked and adjusted if needed The check should be carried out on a flat horizontal floor o
5. d re sult from such use Norsonic AS reserves the right to amend any of the information 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 3421 Lierskogen Norway Tel 47 3285 8900 Fax 47 3285 2208 e mail info norsonic com Find us on the world wide web www norsonic com Copyright Norsonic AS 1994 2004 All rights reserved Preface to this Edition ee Thank you for choosing Norsonic The tap ping machine Nor 211A has been designed to provide you with many years of safe re liable operation We recommend that you take your time to read through this little booklet before you start using the equipment For optimum use of the tapping machine we recommend that you get yourself a copy of relevant standards applicable to you tapping machine application Tranby May 2004 Caution The tapping machine Nor 211A is IP20 protected For indoor use only The unit must be protected from rain and dust Moving parts Never move the unit while it is powered Remove the mains cable before making any check of hammer height or adjust ments to the unit Contents 6 Introduction 7 Fall Height Adjustments 8 Changing Hammer Type 9 Making Measurements 10 Specifications Using the Tapping Machine Nor 211A Introduction The tapping ma
6. e walls than 1 0 metre In cases of non isotropic floor construc tions as will be the case with rib beam constructions more positions may be required 2 The Nor 211A should be oriented at 45 to the direction of the beams or ribs 3 The measurement of impact noise is based on absolute sound level measure ments as opposed to e g the relative measurements used when capturing decays for reverberation time calcula tions Hence you should calibrate your measuring equipment before you start making measurements Consult the documentation accompanying the rest of your equipment 4 Measure the background noise level in the receiving room Use a bandwidth of 1 3 octave bands in the range 100 Hz to 3 15 kHz This is the standard range for building acoustics measurements 5 In the sending room start the tapping machine and verify that the excitation level is at least 10 dB above the back ground noise level Check this for each individual frequency band If this re quirement fails to be met special pre cautions must be taken 6 In the receiving room measure the sound level for the six different tapping E machine positions For each tapping machine position in the sending room one of six randomly distributed micro phone positions is chosen in the receiv ing room The measuring time should always exceed 5 seconds No microphone position should be closer to the room boundaries than 0 5 m Alternatively a
7. ng machine location or use a rotating boom e N LLLLLLLLLLLLLLLLLLLLLL 2 S Specifications Hammers Five hammers 500 g Effective fall height 40 mm adjustable Tapping sequence 10 impacts per second rpm controlled via feedback loop Power 100 120 V 60Hz or 200 240 V 50 Hz Battery operation optional from built in Li Ion rechargeable battery Battery operating time before recharg ing is required Typ 2 hours Battery charging time 12 hours Fuse 0 4 A 100 120 Vac 0 2 A 200 240 Vac Power consumption 15 W Dimensions 72 5 x 23 0 x 32 0 cm w x d x h Weight 10 kg 22 Ibs 12 5 kg 28 5 lbs including option 1 rubber hammers Specifications subject to change without further notice CE conformity EMC compliance according to EN 50081 1 and EN 50082 1 Electrical safety according to EN 61010 1 1993 Machine directive 89 392 Accessories included Mains cable 17 mm wrench pin for removal of the small rod used for verification of the fall height Units equipped with option 2 rubber hammers are in addition supplied with 14 mm wrench and a special pin for removal of rubber hammers and the small verification rod The latter replaces the pin supplied with standard versions of the Nor 211A NN Norsonic Declaration of Conformity We Norsonic AS Gunnersbratan 2 Tranby Norway declare under our sole responsibility that the product Tapping
8. r a horizontal table A tool for this is included viz the small rod mounted onto the tapping machine see the Fig to the left The length of this rod is 40 8mm The 0 8mm extra has been added to compen sate for the friction occurring during the fall thereby ensuring that the effective fall is the required 40mm Do as follows 1 Turn the main gear until one of the ham mers is at its maximum height 2 Place the rod under the hammer and verify that the hammer is less than 1mm above the top of the rod 3 Repeat for all hammers Tf adjustments are needed 1 Adjust the three feet of the tapping ma chine until the correct fall height 40 8mm see above is obtained Make sure the machine is standing level in both directions while doing this 2 Once an acceptable fall height has been reached for all hammers lock the po sition of each foot using the enclosed 19 mm wrench on the screw and the nut Put the fall height control rod back in place Changing Hammer Type Change of hammer type applies to units supplied with extension 1 rubber tipped hammers only The extension 1 includes a pin tool which fits into the hole of each hammer and a 14 mm wrench Do as follows 1 Insert the pin in the hole of the hammer 2 Use the 14 mm wrench as shown in the Fig 3 Give the pin a quick push knock it to loosen the hammer Do not attempt to unscrew slowly and gently as this may cause pin deformation 4
9. rotating microphone boom available separately from Norsonic AS may be used A minimum sweep radius of 0 7 metre is then required The plane of the traverse should be inclined relative to the room boundaries and the microphone should never be closer to any of the room boundaries than 0 5 metre The averaging time when measuring with a rotating boom should be equal to the traverse time of the boom but never shorter than 30 seconds 7 Sequentially select measure and aver age the results from the other tapping machine positions in order to average out local phenomena 8 Measure the reverberation times for the individual 1 3 octave band frequencies in the receiving room At least three positions are required and at least two measurements should be made in each position The equivalent absorption area A may now be calculated from A 0 163 x V T and the normalised impact sound pressure level L may then be calculated from L L 10 x log A A dB in which A equals 10 m You will now be able to calculate Lawas described in ISO 717 vih SLLLLLLLLLLLLLLLLLLLLL LL MAXANAAMAAAMMAMAAAMMAMMAAMAASS SENDING ROOM Use altogether six randomly selected positions on the floor The tapping machine should be oriented 45 to the direction of beams or ribs LLLLLLLLLLLLLLLLLL LLL 2 SY RECEIVING ROOM ISSS Use one of six randomly selected microphone positions per tappi
10. ton starts the unit and a second push stops it If the unit is equipped with option 211A 03 the remote control can be used to operate the unit Press on to begin the tapping and off to end it Please note that a complete start stop sequence must always be operated either from the mains switch or the remote control E g starting the unit by the mains switch and stopping it from the re mote control unit may cause malfunction of the on off control of the tapping machine After approximately 1 5 hours of operation the LED will change from green to orange colour indicating battery low applies only to units with battery op tion installed and after 2 3 hours it will change to red colour The Nor211A will stop functioning when the battery voltage gets too low The unit is RPM controlled by means of a feedback system Hence a low battery voltage will not influence the tapping speed To recharge the batteries just c onnect the tap ping machine to mains Charging time is approxi mately 12 hours No damage is imposed if the unit is left connected to mains longer than the charging time The mains switch should be set to off posi tion when charging the batteries m9 Making Measurements A measurement according to the ISO 140 part 7 will normally yield repeatable re sults when the room volume exceeds 25 m Do as follows 1 Choose six positions at random on the floor No position should be closer to the room boundaries th
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