Nor-277 User Manual - Campbell Associates
Contents
1. user documentation Nnor277 Tapping Machine for Building Acoustic applications Nor277 is a tapping machine for impact noise measurements designed to meet the requirements given in ISO 140 parts 6 7 and 8 as well as ASTM E492 04 and ASTM E1007 04e1 The tapping machine has amonitoring system for verifica tion of proper impact frequency and the speed of each falling hammer The unit is mains operated but may s optionally also be powered from internal rechargeable batteries The impacts may be remotely switched on off by the serial inter face or from an optional wireless remote control tapping machine CE NN Norsonic Nor277 User Guide Im277 1Ed1ROEn Desember 2007 Norsonic is a registered trademark of Norsonic AS All other brand or product names are trademarks or registered trademarks of their respec tive companies Every effort has been made to supply complete and accurate information However Norsonic AS assumes no responsibility for the use of nor for the consequential damages of the use of this information and or the instrumentation described herein Furthermore Norsonic AS assumes no responsibility for any infringement of the intellectual property rights of third parties wherever applicable which would result 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 com2. None Returns Nor277 lt 0R gt lt LF gt Returns software version number Starts normal operation Stops the motor Making Measurements A measurement according to the ISO 140 part 7 will normally yield repeatable results 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 the 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 Nor277 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 calcu lations 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 10dB above the back ground noise level Check this for each individual frequency band If this require ment fails to be met special precautions must be taken 6 In the
3. ROOM Use altogether six randomly selected positions on the floor The tapping machine should be oriented 45 to the direction of beams or ribs RECEIVING ROOM Use one of six randomly selected microphone posi tions per tapping machine location or use a rotating boom Hammers Five in line 100 1 mm between each hammer single hammer weight 500 4 g Diameter 30 0 2 mm Face curvature 500 10 mm Effective fall height 40 mm adjustable 5 mm Extra drop below impact plane 40 mm is at least 4 mm Tapping frequency Each hammer 2 times per second Se quence 1 3 5 2 4 Mean Time between impacts 100 5ms Successive time between impacts 100 20 ms Power 85 264 VAC 47 63 Hz Fuse 2A Power consumption Max 30 W Battery operation Option 1 Operation from built in Lithium lon re chargeable battery Battery operating time More than 1 hour typical 1 5 hours continuous intermittent operation Battery charging time 2 hours Machine in Off The battery is automatically charged when the unit is connected to the mains input Digital interface RS232 9600 baud Connector 9 pin Sub D supplied power 5 volt on pin 9 for sup oly of external modules max 50 mA Dimensions and weight WxHxD feet retracted 165x230x495 mm 6 5x9 1X19 5 WxHxD feet extended 265x230x495 mm 10 4x9 1x19 5 50 mm H including handle 2 10 kg 22 Ibs Environ
4. Field Measurement of Tap ping Machine Impact Sound Transmis sion Through Floor Ceiling Assemblies and Associated Support Structures Specifications subject to change without further notice NN Norsonic Declaration of Conformity We Norsonic AS Gunnersbratan 2 Tranby Norway declare under our sole responsibility that the product Tapping Machine NOR277 to which this declaration relates is in conformity with the following standards or other normative documents Safety EN61010 1 Februar 2001 for portable equipment and pollution category 2 EMC EN 6100 6 3 2001 EN 6100 6 2 2005 following the provisions of the EU Machine Directive 98 37 EC of 22 June 1998 Configuration for test Connected to public power supply machine running 2 m cable connected to RS232 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 November 2007 aefinn 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 NN Norsonic P O Box 24 N 3421 Lierskogen Norway Tel 47 3285 8900 Fax 47 3285 2208 info norsonic com www norsonic com Norsonic AS supplies a complete range of instrumentation for acoustics from s
5. ady been done An alternative hand switch or more hand switches may be paired to the same ma chine or vice versa See Programming the hand switch The Hand switch allows the tapping machine to be started and stopped from remote The switch is a part of option 2 Operation Remote operation Serial interface The tapping machine Nor277 may be re motely controlled by a RS 232 serial inter face 9600 baud with hardware hand shake Commands are ignored if the Nor mal Remote switch is not set to Remote and the Remote selection switch to RS232 If the computer or other controlling device has a 9 pin serial port with a male connec tor use a null modem cable like Nor1463 for the connection Pin no a a 7 Je 8 jer BEEN Set the On Off switch to Off for safety reasons when the unit is not in use or when the fall height of the hammer is adjusted or other adjustments or maintenance are done m9 Operation Maintenance When delivered the Nor277 is verified to fulfil all requirements in the referred stand ards including the height of the falling ham mers Some applications May require a readjustment of the height therefore the fall height of the hammers should be checked and adjusted if needed The check should be carried out on a flat horizontal table or a horizontal floor A tool for this is included a rod mounted on the underside of the machine The length of this gauge correspond
6. ime between impacts is outside the tolerance limits The time between the impacts from each hammer may be logged by the serial interface Correct speed of the falling hammers are indicated by a green blinking LED for each impact of the various hammers If the soeed of the falling hammers is outside the limits the LED starts to light continuously red When the tapping machine is placed on some resilient floors carpets the move ment of the machine may slow down the falling speed of the hammers as can be seen from red hammer indicators If you experience this situation load the machine or the feet of the machine to prevent the movement Operation controlled from the hand switch This mode of operation requires option 2 to be installed This option enables the user to control the On Off without being present in the source room Typical range is 100 m in free field but will also transmit through a concrete wall floor US version is limited to 50 m due to FCC regulations Verify that the supplied antenna is mounted on the top of the machine set the Normal Remote switch to Remote and the Remote selection switch to Ra dio Switch On the tapping machine The Run indicator will light red to indicate no motor speed Press the button on the hand switch to start the tapping A second press will stop the operation toggeling Note The hand switch and the tapping machined have to be paired When deliv ered this paring has alre
7. mental Operation 10 to 40 deg C lt 90 RH Storage 30 to 70 deg C lt 9O RH CE conformity EMC compliance according to EN50081 1 and EN50082 1 safety according to EN61010 1 and Machine directive 89 392 Options Option 1 Battery operation Option 2 Remote Control Transmitting Frequency 433 92 MHz CE compliant for use in Europe 315 MHz FCC compliant for use in USA Transmitting range 100m USA 50m Accessories included Mains cable 13 mm wrench Gauge for height adjustment Specifications Optional accessories Carrying Shipping Case Nor1336 Nor277 fulfil the requirements in the fol lowing standards e ISO 140 6 1998 Acoustics Mea surement of sound insulation in build ings and of building elements Part 6 Laboratory measurements of impact sound insulation of floors e ISO 140 7 1998 Acoustics Mea surement of sound insulation in build ings and of building elements Part 7 Field measurements of impact sound insulation of floors e ISO 140 8 1997 Acoustics Measure ment of sound insulation in buildings and of building elements Part 8 Labo ratory measurements of the reduction of transmitted impact noise by floor cover ings on a heavyweight standard floor e ASTM E492 04 Standard Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor Ceiling Assemblies Using the Tapping Machine e ASTM E1007 04e1 Standard Test Method for
8. mmer Tapping Machine 4 Nor277 3 2 1 Radio Remote RS232 Normal e 5 NN Norsonic Main parts Antenna Option Handle Front panel Feet we o aa aS a Hammer Gauge for height adjustment Front panel Hammer indicators A LED for each hammer blinks Switch for hand switch programming green for each impact The LED Option 2 only lights continuously red when the speed of the falling hammer is outside the requirements Run indicator The LED lights green when the motor is running with the correct speed The LED turns red when the tapping frequency is outside the requirements If the motor Normal Remote switch When the switch is placed in Remote the unit may be re Hammer motely controlled by the RS232 O 5 interface or by the optional is switched off by the remote T ina Machine i control the LED is red until the apping 4 lie for start and stop motor starts running with the cor Nor277 3 of the motor rect speed again 2 O 1 On Off switch i The motor starts automatically Radio Remote coiection switch when the unit is switched On Normal Remote m Selecting between RS232 ae oo enters RS232 interface or the optional hana i sk pour switch for start and stop of the motor Mains indicator Green LED lights as long as mains power is available inde pendent of setting of the On Off switch Connector for serial interface 9 pin Sub D male con
9. municate with us please feel welcome Our address is Norsonic AS P O Box 24 N 3421 Lierskogen Norway Find us on the web www norsonic com Tel 47 3285 8900 Fax 47 3285 2208 e mail info amp norsonic no Copyright Norsonic AS 2007 All rights reserved Caution The tapping machine Nor277 is IP40 protected For indoor use only The unit must be protected from rain and dust Moving parts Never move the unit while it is running Set the On Off switch to Off position before making any check of hammer height or adjustments to the unit Preface nor277 Thank you for choosing Norsonic The tap ping machine Nor277 has been designed to provide you with many years of safe reliable 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 your tapping machine application Tranby December 2007 NN Norsonic O oO N O 11 13 14 Introduction Main parts Front panel Operation Remote commands Making measurements Specifications Declaration of conformity UY A A A AGE 7A Using the lapping Machine Nor277 Introduction The tapping machine Nor277 is the third genera
10. nector e NN Norsonic Mains inlet If Nor277 is equipped with bat tery the battery is charged while Charge condition indicator the unit is connected to mains The charge condition for the optional independent of the position of internal battery is displayed by three Battery check switch the On Off switch LED indicators When all indicators are Press the switch for battery status indica lit the battery is close to fully charged tion gt 2 3 When the battery charge is be low 1 3 only the lower LED is lightening and when the battery is close to empty the lower LED starts blinking Mains or battery operation All Nor277 tapping machines may be pow ered from mains Optionally the unit can be equipped with an internal battery option 1 that will run the unit for more than one hour Mains are automatically selected when available When connected to mains the green LED Light Emitting Diode for mains indication is lit Normal operation For normal operation set the Normal Re mote switch to Normal Use the On Off switch for starting and stopping the tapping machine Correct operation is indicated by green colour on all LEDs Correct impact frequency is indicated by green colour on the Run indicator above the On Off switch The motor speed is monitored by the crys tal controlled digital processor and the LED change from green to red if the speed de viation is more than 5 The LED will indi cate when the mean t
11. ound calibrators micro phones amp preamplifers via small hand held 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
12. r to stop the motor from running Push a small rod paperclip into the tiny hole located above the switch marked radio to activates a push button press shortly since pressing for more than 10 seconds will erase previously installed remote hand switches Press and release the button located on the remote hand switch Wait 10 seconds Repeat the press and release on the remote hand switch e Wait 20 seconds e The hand switch is now programmed to the Nor277 Remote commands The remote communication is based on RS 232 which allows long cables between the computer and the tapping machine The maximum length of cables will depend on the type of cable capacitance and the controlling device It is therefore not pos sible to specify the maximum length but up to 100 m has been used successfully If your computer does not have an RS 232 serial interface we recommend connecting the tapping machine to the USB port by us ing a commercially available USB RS 232 adaptor An alternative to cable is to use a Bluetooth to RS 232 adapter 5 volt for powering the module is available on pin 9 All command consists of two characters CAPITALS followed by a Space and even tually a parameter All commands must be ended with carriage return lt CR gt ascii 13 A line feed lt LF gt is ignored If an un known command is sent the character is returned Instructions for normal operation a SEERE CO TEE rip
13. receiving room measure the sound level for the six different tapping machine positions For each tapping machine E position in the sending room one of six randomly distributed microphone posi tions is chosen in the receiving room The measuring time should always exceed 5 seconds No microphone position should be closer to the room boundaries than 0 5m Alternatively a 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 10xlog AVA dB in which A equals 10m You will now be able to calculate hg as described in ISO 71 SENDING
14. s to the distance between the bottom of the tapping machine and the floor for obtaining an effective fall height of 40 mm for the hammers Note that the lifted hammers should be 40 5 mm above the floor in order to compensate for losses due to friction Place the gauge at the line between the hammers close to the foot to be checked See adjacent picture If adjustments are needed 1 Adjust the three feet of the tapping ma chine until the correct height is obtained Make sure the machine is standing level in both directions while doing this 2 Once an acceptable fall height has been reached lock the position of each foot using the enclosed 13 mm wrench on the nut 3 Put the fall height gauge back in place If the monitors for the falling hammers indi cate excess friction the hammers and the guides have to be cleaned and oiled Since the tapping machine may be used in a va riety of environmental condition it is difficult to predict how often this has to be done We recommend that this maintenance is done EET by a Norsonic service department It is recommend that the tapping machine is calibrated by an accredited calibration laboratory at least every second year Battery maintenance The optional battery is of the lithium ion type and is automatically charged while the unit is connected to mains We rec ommend keeping a tapping machine in regular use connected to the mains sup ply when stored This will ensure tha
15. t the battery is fully charged and ready for use The charge control will prevent the bat tery for being overcharged A three step LED battery monitor tells the user about the state of charge Charging time for an empty battery is 2 hours The mains switch should be set to off position when charging the batteries No other maintenance other than charg ing is normally required for the battery In case of a malfunctioning battery the bat tery has to be replaced by skilled service personnel A fully discharged battery will be indicated by no light on the battery indicator LEDs even when the button for battery check is depressed The test has to be done with out mains connected If the battery is fully discharged the tapping machine has to be switched On for about 20 seconds to activate the fast charging Tip Set the Normal Remote switch to Remote if you don t want the motor to start The Nor277 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 as long as the machine keeps running Programming the hand switch The supplied remote hand switch is pre programmed for the supplied Nor277 Sev eral hand switches can be programmed for one or more tapping machines or vice versa The procedure is as follow e Switch on Nor277 Place the Normal Remote switch in position Remote RS232 in orde
16. tion of tapping machines from Norsonic for performing standardised im pact noise tests foot fall noise It incor porates all the experience from the former generations into a compact light yet a rugged unit with the construction based on an extruded aluminium chassis The ham mers are made of hardened stainless steel ensuring non deformation of the hammer shape even after years in use The unit weight is only 10 kg including the optional battery Retractable feet ensure easy trans portation and storage The unit has the required five hammers each weighting 500 g with a fall height of 40 mm and 100 ms between each hammer impact A crystal controlled servo system ensures the correct tapping frequency is maintained at all times and temperatures A spirit level gauge mounted on the top assists the user to obtain vertical fall di rection Each hammer is fitted with an optical sen sor to measure the impact rate and velocity for ensuring that the energy imparted into the test floor is correct Hence the effects of any friction or misalignment are imme diately apparent Each hammer has a LED indicator on the front panel that indicates when the impact velocity and tapping frequency are within the requirements of the standard The user can now be assured that the excitation generated by the system conforms to the requirements of the standards and there fore concentrate on the other aspects of the measurement 6m g Ha
Download Pdf Manuals
Related Search