Gracey Hire Logo
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

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

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

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

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

Nor 840  Sound Level Meter

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

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

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

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

Planning policy guidance notes set out the UK Government's policies on different aspects of planning. Local authorities must take their content into account in preparing their development plans. They may be material to decisions on individual planning applications and appeals.

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: -

Outlines the considerations to be taken into account in determining planning applications both for noise
sensitive developments and for those activities which will generate noise;
 
Introduces the concept of noise exposure categories for residential development, encourages their use and
recommends appropriate levels for exposure to different sources of noise; and
 
Advises on the use of conditions to minimize the impact of noise.

To download PPG24, right click here



RASTI - Measurements and Applications 1.78 MB pdf file

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

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

Nor 116 Sound Power Meter 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

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

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

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

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

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
Home l Manufacturers l Applications l Hire Notes + FAQ l Site Search l Standards l Calibration l Downloads l Glossary l Feedback + Links l IOA l NEWS