Gracey & Associates Hire and Calibration
Downloads
The information on our main web pages is necessarily brief, so for customers who need more details, we provide
Internal links to more details and the full specifications on all main pages
A Links Page with quick access to the manufacturers web pages and other useful information sites
This page, where we provide some additional notes on a variety of topics.
They are in PDF [Acrobat] format so they may be download to your PC and read 'off-line' later. Or if you have broadband you may prefer to open any document and read it now. If you do not have a PDF Reader on your PC, it is available free from Adobe - see our links page.
| B&K 2250 - Memory Logging Capacity | 32 KB xls file |
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Simple MS Excel Spreadsheet that helps with estimating the amount of memory a particular measurement will require.
To download right click here and select 'Save ......'
| B&K 2260 - Memory Estimator | 91 KB xls file |
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Simple MS Excel Spreadsheet that helps with estimating the amount of memory a particular measurement will require.
To download right click here and select 'Save ......'
| Building Acoustics and Room Acoustic Measurements | 900 KB pdf file |
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B&K publication providing a brief explanation of the following topics:-
Sound in Rooms
Reverberation Time
Sound Absorption
Sound Distribution
Speech Intelligibility
RASTI
Sound Reduction Index
Coincidence Effect
and more .....,
click here and select Save or Open.
| Environmental Noise Assessment - Pure Tones | 113 KB pdf file |
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Most people find noise more annoying if it contains audible tones, so it has been the common practice to add a dB penalty, based on a simple subjective assessment. In 1992 the Germans proposed the DIN 45681 which resulted in ISO 1996-2 and the equivalent BS 7445-2
To read the Norsonic article Quantification of Tonal Penalties in Environmental Noise Assessments which also describes how the Nor 110 and Nor 121 analysers measure the tonal values, click here and select Save or Open.
| Measuring Extremely Low Sound Levels | 412 KB pdf file |
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Sometimes you need to measure sound pressure levels below the inherent noise of even the best sound level meters. Levels below 0 dB may be measured using two microphones, a Nor 1264 preamplifier holder and a Nor 840 real time analyser.
To download the Low Level Measurement Note right click here and select 'Save ......'.
| MLS - a revolutionary measurement method for building acoustics | 403 KB pdf file |
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The Nor 840 with MLS measurement mode is the only practical way to measure high sound insulation in high background noise levels, or in a room where the noise excitation level is insufficient. The BS EN ISO 140 Standards introduced testing over the extended range 50 - 5000 Hz. Due to speaker inefficiency below 100 Hz and the need to measure received sound levels at least 10 dB above the background noise at both ends of the spectra; this can be a problem using traditional techniques. The Nor 840 with MLS solves all these problems
To download the MLS Application Note right click here and select 'Save ......'
| MLS - Maximum Length Sequence - a little theory | 157 KB pdf file |
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If you would also like to read the theory behind the MLS technique, written by Ole Herman Bjor, then please download the eight page document by right clicking here and selecting ' Save ......
| Nor-Mon - Noise Nuisance Investigation | 567 KB pdf file |
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A self-contained system with a client operated switch for the investigation of noise nuisance complaints. Includes a Nor 116 analyser in a lockable case, with batteries, tripod etc., plus a modified Sony D8 DAT Recorder with a Nor 255 remote control.
When a 'noise event' occurs the resident pushes the start button, the raw noise data is captured with date and time on the tape and the Nor 116 analyzer simultaneously records the level v time history and / or statistical analysis - 4 selectable modes
To download the Noise Nuisance Application Note, right click here and select Save or Open
See also the B&K Matron
| Planning and Noise - PPG24 | 268 KB pdf file |
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This PPG gives guidance to local authorities in England on the use of their planning powers to minimise the adverse impact of noise and builds on the advice previously contained in DOE Circular 10/73. It: -
sensitive developments and for those activities which will generate noise;
recommends appropriate levels for exposure to different sources of noise; and
| RASTI - Measurements and Applications | 1.78 MB pdf file |
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Describes the RASTI Method and the basic operation of the b&K 3361 RASTI System. It then goes on the describe the measurement of Speech Intelligibility in some Open-plan Offices. The next section describes some practical RASTI measurements in the Newman Auditorium. Followed by the Evaluation of a sound reinforcement system.
To download the RASTI Measurement and Applications Note, right click here and select Save
| RASTI - Speech Privacy | 2.54 MB pdf file |
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A Bruel & Kjaer Application Notes describing the use of the B&K 3361 RASTI system to measure unintelligibility or speech privacy, rather than the common use of establishing the speech intelligibility.
To download the RASTI - Determination of Speech Privacy, right click here and select Save
| Sound Power Measurements | 590 KB pdf file |
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The Nor 116 precision sound level meter fitted with option 8 is suitable for Engineering and Survey measurements of the LwA - A-weighted sound power levels. Sound power measurements according to BS EN ISO 3740 and BS EN ISO 3746. CE marking of new products. To download the Sound Power Application Note, right click here and select Save
| USB - RS232 (Com Port) Connector Driver | 3.1 MB program file |
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Some of our equipment does not have a USB connector, but uses an RS 232 Serial Port connector. Many new PCs and Laptops do not have this type of connector, so we are providing a connector in order to allow you to download data, etc. When you plug this connector in to your USB port, you may be asked to install a driver. This depends on whether your computer is already configured to accept these type of devices. If you require a driver, then you can download it from our web-site using this link. For support purposes the connector is based on the Prolific chip set.
To download a the driver install program- right click here and select 'Save ......'
| Vibration Accelerometers - Piezoelectric - Theory and Application | 113 KB pdf file |
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This handy booklet outlines the advantages and drawbacks of piezoelectric accelerometers, as well as the design. It also discusses mounting, cabling and other practical considerations.
To download a copy - right click here and select 'Save ......'
| Vibration Analysis using a Sound Level Meter | 21 KB pdf file |
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Gracey & Associates stock a wide range of vibration analysers. However it's worth remembering that a sound level meter will also measure vibration if the microphone can be replaced with an accelerometer. Many sound level meters are suitable, so we hire adaptors for this purpose. The article also deals with converting the sound level meter dB scale to vibration units.
To download right click here and select 'Save ......'
| Vibration Conversion Chart - dB to Engineering Units | 26 KB pdf file |
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Vibration Conversion Chart to read off vibration levels and other engineering units from a sound level meter.
To download right click here and select 'Save ......'
| Vibration Nomogram | 37 KB pdf file |
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Vibration Conversion Chart: acceleration to velocity and displacement, velocity to acceleration and displacement etc., this handy chart can make life much easier. - right click here and select ' Save ......'
Gracey & Associates 01933 624212 hire@gracey.com
British Standards accreditation for noise and vibration instrument hire and calibration
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