3M eg4 Leq Equivalent Level, Logging, Maximum Level Lmax, Measurement Range, Minimum Level Lmin

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Appendix B

Glossary of Terms

Leq (Equivalent Level)

The true equivalent sound level measured over the run time. The term LEQ is functionally the same as LAVG except that it is only used when the Exchange Rate is set to 3 dB and the threshold is set to none.

Logging

(Also called Data Logging.) Certain measurements, such as average level (Lavg) and maximum level (max), can be recorded by the dosimeter at regular intervals. For example: A dosimeter is set to log Lavg and max at one minute logging intervals. If the dosimeter runs for one hour, then it would log 60 Lavg results and 60 max levels. You would be able to see the average and maximum levels for each minute of the one hour run time.

Maximum Level (Lmax)

The highest sampled sound level during the instrument’s run time allowing for the unit’s Response Time setting (Fast or Slow).

Measurement Range

The decibel range within which the unit’s measurements are valid.

Minimum Level (Lmin)

The lowest sampled sound level during the instrument’s run time allowing for the unit’s Response Time setting (Fast or Slow).

Noise Floor

In a “Perfectly Quiet” room, the electrical noise produced by the microphone is approximately 35 dB on A-weighting and 45 dB on C-weighting. These levels are known as the Noise Floor of the instrument. The Noise Floor can cause inaccurate measurements at low measurement levels. Measurements must always be at least 5 dB above the Noise Floor to be valid. Therefore, the lowest valid measurements of the dosimeter are approximately 40 dB on A-Weighting and 50 dB on C-Weighting.

Peak Level

Peak is the highest instantaneous sound level that the microphone detects. Unlike the Max Level, the peak is detected independently of the unit’s Response Time setting (Fast or Slow). Example: The peak circuitry is very sensitive. Test this by simply blowing across the microphone. You will notice that the peak reading may be 120 dB or greater. When taking a long-term noise sample (such as a typical 8- hour workday sample for OSHA compliance), the peak level is often very high. Because brushing the microphone over a shirt collar or accidentally bumping it can cause such a high reading, the user must be careful of placing too much emphasis on the reading.

053-644, Rev H

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eg4

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Contents Edge 3M The Edge Personal Noise DosimeterTable of Contents Setting-up the Edge via DMS Time history……………………………………………………………………………………………………Stopping a study Viewing measurements on the displayTechnical Support Replacing microphone and windscreenPhysical attributes of EdgeDock1 and EdgeDock5 INDEX…………………………………………………………………………………List of Figures List of TablesDosimetry Edge and dosimetryNoise dosimeter Illustration of how the dosimeter operates and processesRange of sound What do the standards say?Applications of the Edge Setting-up your dosimeter parameters for your noise studies Noise assessment stepsRunning your studies View your results via DMSParameter setup screen for eg4 Edge ModelChecking the equipment Identifying your equipmentLED indicator Turning onLED indicators explained Turning offDiagram Display and keypadLoading 3MTMDetection Mangement Software DMSDocking station functionality EdgeDock1 and EdgeDock5 components Docking station componentsEdgeDock1 or EdgeDock5 Powering EdgeDock1 or EdgeDock5  Powering EdgeDock1 or EdgeDock5 How to charge Charging your dosimeterMounting the docking station to a wall Storing the dosimeterUnderstanding what data is stored Noise studiesSummary data Time historyViews on the Edge LoggingDosimeter views and definitions Definitions of data log values and viewsViews on Explanation Weighting Views on Explanation EdgeDose Response LevelDescriptors Variants Lmax variants Dosimeter measurement descriptors/variantsDocking Communicating & downloading dataCustomizing set-up parameters in DMS New Hardware wizard for Edge DockDosimeter setting Dosimeter screenEdge dosimeter settings Dosimeter fields explained for the EdgeDisplay setting Edge display screenSecurity setting Edge security settingAuto Run setting Edge auto run screenFirmware update 10 Edge firmware update screenSaving and sending/setting configurations 11 Saving and sending Edge setupsOverview of running a study Quick Help List typical dosimetry sessionPositioning the Edge on your shirt Windscreen and maintenance How to attach the dosimeter Checking battery power  Checking battery powerCalibrating  Calibrating the dosimeterResetting the dosimeter  ResetOn/off/enter button Setting contrast on dosimeter Contrast Starting a run  How to run a noise studyRunning studies Indicators/Icons on the display  How to stop a noise studyIndicator Icon Explanation Indicators i.e., run, stop, battery, and OL Viewing measurements Viewing measurements on the displayLocking or securing your dosimeter during run  How to lock or secure  How to unlockLocking or Securing UnlockingDownloading data  DownloadingDMS start screen Viewing data and data finder  Selecting and viewing dataReport View Example of Edge Report in DMSPanel Layout Viewcharts/graphs Panel layout view viewing the data in charts and graphsLED indicator disable/enable Technical Support Attaching/Detaching the windscreen and microphone Replacing microphone and windscreenAttaching/Detaching Hard Hat Attachment Kit Hard Hat Attachment kitMechanical characteristics StandardsUser Interface Electrical characteristicsEnvironmental effects EdgeDock1 and EdgeDock5 Physical attributes of EdgeDock1 and EdgeDock5Measurement parameters MeasurementsTypes Communications Special functionsSecurity Auto-RunEdge Block Diagram Edge Block Diagram Appendix B 3M Service WarrantyService Department and Technical Support 1 800 Contacting 3MGlossary of Terms Background Noise, effectsCriterion Level CL Combining Noise sourcesCrest Factor Criterion Time Decibel dBDose Exchange Rate ER also known as the Doubling RateFree field setting microphone Hearing Conservation HC Hertz HzLavg Average Level Lep,dLeq Equivalent Level LoggingMaximum Level Lmax Measurement RangePEL Permissible Exposure Level Projected TimeRandom incidence microphone Response TimeTWA Time Weighted Average ThresholdWindscreen Weighting A, C, Z, etcUpper Limit UL Measurement equations Index Running studies About 3M Personal Safety About Us
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