3M Occupational Health & Environmental Safety Division 3M™ The Edge Personal Noise Dosimeter MODELS eg3 and eg4 The Edge models eg4 and eg3 User Manual
i Table of Contents Chapter 1: Introduction ................................................................... 1 Dosimetry ........................................................................................ 1 Noise dosimeter ............................................................................................ 2 Range of sound ............................................................................................. 3 What do the standards say? ..............................................
ii Table of Contents Chapter 3: Setting-up the Edge via DMS ...................................... 16 Noise studies ................................................................................. 16 Understanding what data is stored .............................................. 16 Summary data ..............................................................................................17 Time history 17 Views on the Edge .........................................................................
iii Table of Contents Starting a run ...............................................................................................37 Stopping a study............................................................................ 38 Indicators/Icons on the display......................................................................38 Viewing measurements on the display ......................................... 39 Locking or securing your dosimeter during run ...............................................
iv Table of Contents EdgeDock1 and EdgeDock5 .......................................................... 51 Physical attributes of EdgeDock1 and EdgeDock5 ...........................................51 Measurements ............................................................................... 52 Types ..........................................................................................................52 Measurement parameters ............................................................................
List of Figures v Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure 1-1: 1-2: 1-3: 2-1: 2-2: 2-3: 2-4: 2-5: 2-6: 3-1: 3-2: 3-3: 3-4: 3-5: 3-6: 3-7: 3-8: 3-9: 3-10: 3-11: 4-1: 4-2: 4-3: 4-4: 4-5: 4-6: 4-7: 4-8: 4-9: 4-10: 5-1: 5-2: 5-3: 5-4: 5-5: 6-1: The Edge and dosimetry ................................
CHAPTER 1 Chapter 1: 1 Dosimetry Introduction Measuring noise in the workplace is an important element of hearing conservation programs and noise reduction programs. With a noise dosimeter, you can assess and determine a worker’s daily exposure to noise levels. This information can be used to ensure compliance with regulatory bodies or to ensure if hearing conservation programs are needed.
2 Dosimetry Noise dosimeter What is a noise dosimeter and how does it compute measurements? Essentially, a noise dosimeter is composed of the following: a microphone with a preamplifier, a weighted network, fast or slow response time, an internal clock, calculator, and memory to store logged data. The illustration below is a diagram of a basic noise dosimeter. The microphone will, when exposed to a sound pressure, generate an electrical signal.
3 Dosimetry Range of sound Sound pressure is measured in decibels, or tenths of a Bel. Sound pressure level is indicated as dB SPL. Since the human ear can detect sounds with an extensive range of amplitude, a decibel scale is used to simplify the measurement results. For example, the ratio between the threshold of hearing and threshold of pain in the human ear if measured in true energy is 10,000,000 times! The same range using the dB scale is 0 - 140 dB referenced to 20 µPa (Micropascals).
4 Dosimetry Applications of the Edge The Edge has a cable-free, mounted microphone that converts sound pressure into an electrical signal. This signal is conditioned, monitored, and integrated over time in order to provide a host of automatically calculated values that can be used in occupational and environmental noise assessments. Programmable parameters permit the Edge to serve many applications.
5 Dosimetry Noise assessment steps 1. Perform a task-based work flow analysis of unacceptable “noisy” areas and list regulations/codes you will follow. Observe facility/areas and jot down areas of concern Check with standards and noise ordinance regulations in your region/city. See Chapter 1 for basic information on dosimetry and standards 2. Setting-up your dosimeter parameters for your noise studies. Customize measurement setup (i.e., criterion level, threshold, weighting, exchange rate, etc.
6 Dosimetry The Edge Models Quest Technologies offers two Edge models. The “eg4” model features two virtual dosimeters with data logging. Once the parameters are set and saved in the dosimeter, you can monitor two different dosimeters by a single press of the Enter button. This will toggle you between the two dosimeters. The “eg3” model is equipped with one dosimeter setting and will not data log.
CHAPTER 7 2 Checking the equipment The Edge Models Getting started This chapter is designed to guide you through basic information you will need to begin logging your studies. If your instrument was sent to you in a storage case, you will want to remove all the packaging and acquaint yourself with the following equipment so you can quickly get started with your noise studies. NOTE: Depending on the accessories you selected, the dosimeter may have the following components.
8 Turning on LED indicator 1. To turn on the Edge, press the on/off and enter button. The Edge splash screen (see Figure 2-3 for an example, page 10) will appear indicating the model (i.e. “eg4” or “eg3”) and firmware version. The screen will be in the measurement view. LED Indicator Battery indicator icon If icon is fully shaded, this indicates full battery power (approx.
9 Turning off LED indicator Table 2-1 identifies when and why the LED indicator color will appear. NOTE: The LED indicator can be disabled via DMS (see section, “Dose indicator LED” page 25). LED indicator The EDGE LED indicator Red Explanation A flashing red LED indicates the dose has exceeded the alarm level. A flashing amber LED indicates the dosimeter is stopped and has not exceeded the dose alarm level.
10 Display and keypad Diagram The keypad is used to run and stop your studies, view your measurement values, and power on and off the dosimeter. The following diagram explains the features on the display and keypad.
11 3MTMDetection Mangement Software (DMS) Loading 3MTM Detection Management Software (DMS) is a software application designed by 3M Quest that runs under the Windows operating system. You can use DMS for a variety of functions related to the Edge dosimeter and with many other 3M Quest instruments. DMS has the ability to customize your set-up parameters, display data, manipulate data, and create reports. To load DMS, follow the screen prompts.
12 Docking station functionality Docking station components The table below explains the EdgeDock1 or EdgeDock5 LED indicators, power connector, USB connector, and contact pins. Docking station components Charging indicator Power indicator Power connector USB connector Charge Contacts Explanation Identifies if the dosimeter is “charging” or “fully charged”. A red blinking LED indicates the dosimeter is charging. A solid green LED equates to a fully charged dosimeter.
13 Docking station functionality Powering EdgeDock1 or EdgeDock5 Powering EdgeDock1 or EdgeDock5 1. Assemble the charger adapter and plug adapter as illustrated in Figure 2-5. (It will be the same process for an EdgeDock5.) 2. Plug the charger adapter directly into the wall (electrical wall plate). 3. Plug the opposite end into the power connector (or jack) of the EdgeDock1. NOTE: a light, solid red light will appear indicating power to the charger. EdgeDock1 LED indicator Amber indicates “ON”.
14 Docking station functionality Charging your dosimeter The number of hours you have used your dosimeter from your last charge will impact your total charge time. For example, if the battery clock indicator (see “Checking the battery power” for more information) displays 20 hours remaining on the battery and you wish to charge the battery, the approximate charging time is 2 hours. To charge a fully discharged battery, allow approximately 4 to 4.5 hours of charge time. How to charge 1.
15 Docking station functionality Mounting the docking station to a wall The docking station is equipped with two single screw slots in case you wish to mount the docking station to the wall. The figure below displays the backside of the single bay dock. Screw slots Used to mount to a wall Figure 2-8: Backside of EdgeDock1 To preserve the life of the battery, it is suggested that the dosimeter is turned off when you are storing the dosimeter.
CHAPTER 16 3 Understanding what data is stored Noise studies Chapter 3: Setting-up the Edge via DMS The eg4 model comes equipped with two customizable user setups. The eg3 model has one customizable user setup. You have the option to customize the parameters for threshold values, exchange rate values, an upper limit value, and a criterion level. This chapter explains data storage, the pre-set views on the dosimeter, and how to customize the parameters and display of your Edge via DMS.
17 Understanding what data is stored Summary data Summary data represents values that occurred over the entire run of the study. For an average value, such as Lavg, it represents the average decibel value over the entire run time. Peak and Max values are the highest measurements that occurred throughout the run time. Figure 3-2: Sample summary data from DMS reporting Time history data is also referred as “logged data” which plots measurement values in minute by minute intervals.
18 Views on the Edge Logging eg4 model only logs at one minute intervals and includes the following measurements: Meter 1 logs Lavg/Leq, Lcpk, and Lasmx Meter 2 logs Lavg/Leq If the dosimeter runs for one hour, then it will log 60 Lavg/Leq results, and 60 Lasmax/Lcpk levels. In DMS, you can customize the logged data chart results by checking Lavg/Leq, Lcpk, and/or Lasmax measurement values when using the button. The Edge is a user-friendly and customizable dosimeter.
19 Views on the Edge Definitions of data log values and views To set up the Edge and work with noise-level data, you will want to have a good understanding of the terms listed in Table 3-1. NOTE: The following table is based on A-weighted, slow measurements. Thus, if you choose A or C-weighted with Fast or Slow response the measurement values will change on the display (i.e., you selected sound pressure level with C-weighting with Fast response, it will display as LCF.
20 Views on the Edge Definitions of data log values and views Views on the Edge LTWA Explanation Time-weighted average - is the sound level (in dB) that is accumulated for any time period but with its average level computed over an 8-hour period. TWA is usually measured with A-weighting, Slow response, and a 5 dB exchange rate. All sound levels at or above the threshold level (cutoff level) are averaged into the calculations relating to noise exposure.
21 Views on the Edge Definitions of data log values and views Views on the Edge Explanation Memory storage symbol – eg4: The eg4 model displays the total memory storage remaining in hours and minutes. For example, if it displays the memory symbol 181:50 this represents 181 hours and 50 minutes of memory storage remaining on the dosimeter. eg3: The eg3 model displays the memory by indicating the remaining number of studies it will store into memory.
22 Docking Communicating & downloading data By using your docking station, USB cable, software, and your dosimeter, you can quickly communicate between the software and the dosimeter. There are two methods for communicating which are: Send setup data: Enables you to configure your set-up parameters in 3MTM Detection Management Software and download these parameters to the Edge.
23 Docking Customizing set-up parameters in DMS Communicating & downloading data 4. For first time use of a docking station, Welcome to the found new hardware wizard will appear (see Figure 2-8). Select No and press Next through the remaining wizard. At the end of the wizard, press Finish. This will install the hardware components associated with your EdgeDock1 and/or EdgeDock5.
24 Customizing set-up parameters in DMS Dosimeter setting The Edge general settings are used to setup the instrument with basic parameters. The eg4 model features two virtual dosimeters in one with two customized, user-defined settings. Please refer to the Edge dosimeter settings table below for an explanation of setup details. 1. Click on the Dosimeter tab from the Edge’s Instrument Configuration panel (see 1). To change the dosimeter settings, follow one (or all) of the selection options below.
25 Customizing set-up parameters in DMS Dosimeter setting Dosimeter settings for the Edge Heartbeat enable Response C-A enable Projected Time Peak Weighting Name Field *Note: refer to Glossary for more detailed information. When enabled (or checked), the LED will flash green while running and flash amber when stopped. Either Slow Time Response or Fast Time Response is applied to the measurements. (Typically Slow time response is used in the US market while Fast is used in the EU communities.
26 Customizing set-up parameters in DMS Display setting The display screen is used to customize the parameters which will appear on your Edge. It is organized by two columns, the “Display position” and the “Item to Display” and includes a “Set selected Items” selection/drop down box. The display position indicates the order of the parameter (or item) which will appear on the display, while the “Item to display” designates the measurement or parameter.
27 Customizing set-up parameters in DMS Security setting The security setting is a type of “locking” feature (or secure run feature) that enables you to password protect the instrument to prevent users from inadvertently terminating a study. Initially, this feature is set through the software and turned on once in run mode by pressing run/stop key three consecutive times. (To unlock, press run/stop key three consecutive times and then press power key.) To set this feature, please follow the steps below.
28 Customizing set-up parameters in DMS Auto Run setting With the Edge auto run setting, you may program up to two auto start and auto stop configurations when start date and duration parameters are enabled. This may be useful if you wish to pre-set the instruments to run and stop for a specific time period, such as a week long study. See steps below to enable. 1. Click on the Auto Run tab from the Edge’s Instrument Configuration panel (see 1) and click in the Enable auto run mode checkbox (see 2). 2.
29 Customizing set-up parameters in DMS Firmware update Edge firmware updates are performed in DMS when the instruments are docked, communicating, and the update key is selected. Please follow the steps below prior to updating your Edge(s). Note: this feature enables you to update all of your docked Edges (when powered on and not in run mode). 1. Click on the Firmware tab from the Instrument Configuration panel (see 1) and ensure to dock the Edge (or Edges) .
30 Customizing set-up parameters in DMS Saving and sending/setting configurations With the Edge, there are saved setup profiles used to quickly access and apply to The Edge(s). Below explains how to save configuration settings in DMS and how to send/set to the instrument. Note: if you wish to only send the setup, please skip to step 3. Please refer to this section as you setup your instrument. 1.
CHAPTER 31 4 Overview of running a study Running and operating your dosimeter The focus of this chapter is to discuss the procedures for running and operating the Edge and includes positioning, calibrating, and viewing the Edge measurements. The list below is a brief overview of the steps for running a study. Quick Help List: typical dosimetry session 1. Turn the dosimeter on and check your battery power. 2. Reset the dosimeter. 3.
32 Overview of running a study Positioning the Edge on your shirt Depending on what accessories you ordered with the Edge, you may have either clips on the top and bottom of the dosimeter or some other type of mounting device. (Please refer to Appendix A, “Contacting 3M Quest”, page 59). How to attach the dosimeter 1. Clip the dosimeter on your shirt and ensure the microphone is positioned as high on your shoulder as possible and away from your neck. a.
33 Overview of running a study Checking battery power Typically, the life of the battery is approximately 60+ hours (see Appendix A for specific specifications). The dosimeter can be charged at any time by using your EdgeDock. There are two battery identifiers on the dosimeter which are the battery indicator icon and the battery power clock (see Figure 4-3). Checking battery power 1.
34 Overview of running a study Calibrating 3M Quest Technologies recommends to calibrate your dosimeter before you run your study(ies) and after your study(ies) to ensure highly accurate measurement results. The steps below address how to calibrate for either a pre or post calibration. Calibrating the dosimeter 1. Remove the windscreen from the dosimeter by unscrewing it. (See Figure 6-1 for an illustration, page 50.) 2. Ensure the Edge is turned on and in the stop mode.
35 Overview of running a study Resetting the dosimeter The Edge can be reset through the dosimeter keypad or via QSP-II. The steps below outline how to reset your dosimeter. Reset 1. Ensure the meter is Off. 2. Turn the meter on by pressing the on/off enter button. 3. When the splash screen appears, press and hold the run/stop buttons until the splash disappears. and on/off enter Edge Splash screen Figure 4-5: Splash screen 4. The Setup menu appears on the Edge.
36 Overview of running a study Setting contrast on dosimeter Contrast 1. Ensure the meter is Off. 2. Turn the meter on by pressing the on/off/enter button. 3. When the splash screen appears, press and hold the run/stop buttons. (See figure 4-5 for splash screen). and on/off enter 4. The Setup menu appears on the Edge. Repeatedly press the arrow key until the Contrast symbol is selected. NOTE: Setup menu is used to reset the dosimeter, change the contrast, and return to the main view.
37 Running studies Starting a run With a couple pushes on the keypad buttons, you will be running and viewing your study (ies). Following your study (ies), you can load the data/files into QSP-II to manipulate, analyze, save, and create reports (See Chapter 5 for viewing your logged data in QSP-II). How to run a noise study 1. If your dosimeter is turned off, press the on/off enter button to power on. 2. Press and hold the run/stop button. A 3, 2, 1 countdown will appear. 3.
38 Stopping a study Indicators/Icons on the display While the dosimeter is running, you can end the study by pressing and holding the stop button. How to stop a noise study 1. While running, press and hold the run/stop button. a. A 3, 2, 1 countdown will appear. b. The stop indicator will be shown in the display. The Edge is equipped to notify you of operational/status updates. These indicators (or alert notices) are located on the top right-hand side of the screen.
39 Viewing measurements on the display Locking or securing your dosimeter during run The up/down arrows on the keypad of the dosimeter enable you to move through the various measurements. For specific information on the views of the Edge, please see “Views on the Edge”, page 18). Viewing measurements 1. Press the or arrows. This will move you through the views on the display.
40 Viewing measurements on the display Locking or Securing How to lock or secure 1. Turn the dosimeter on and press the run/stop 2. To enable the lock, press run/stop second intervals. The Lock screen will appear. button to begin logging your study. button three consecutive times within one Key indicator Indicates dosimeter is locked while running.
CHAPTER 41 5 Viewing measurements on the display Downloading data The focus of this chapter is to discuss how to view your studies with the 3MTM Detection Management Software (DMS). The first section explains how to retrieve your studies from the dosimeter, and the subsequent sections will then walk you through viewing, organizing, and customizing your stud.
42 Viewing measurements on the display Downloading data 4. In DMS’ start screen, choose . Download Figure 5-2: DMS start screen 5. Select Noise Dosimetry (see 1), Edge (see 2), and Edge 3-4 (see 3) from the family panel. 6. Select the docked Edge (s) to download by clicking in the checkboxes by the EdgeDock-5 section(see 4).
43 Viewing measurements on the display Viewing data and data finder page 8. The sessions (files) will load and post to the Data Finder page under Family: Noise Dosimetry heading. Quick tip: click on the button and the data files will post directly under the specific family. Click on the file and select either to view in charts and graphs. 1 Example of data file in recent view Figure 5-4: Recent downloaded data After the data is downloaded, it is stored and viewable in the data finder.
44 Viewing measurements on the display Report View The button provides a quick link to view/print the Edge data. To customize the data, refer to the next session, panel view page. Click to print the report. Edge, logged data chart displayed in DMS report (scroll through to view the online report if applicable).
45 Viewing measurements on the display Panel Layout View(charts/graphs) When you are in the data finder page (see above), select either the Analyze button or double-click on a session/study to view the data in charts and graphs as displayed in Figure 5-7. The measurements and parameters will be displayed in charts and graphs which may be customized for analysis and/or reporting purposes. 1.
CHAPTER 46 6 Technical Support LED indicator: disable/enable Technical Support Some users may prefer to turn off the LED indicator. To disable this feature, open QSP-II and select the Setup button. On the dosimeter tab, under Dose% indicator LED uncheck the following: Alarm Enable 053-644, Rev E Alarm enable: Will disable the flashing red LED when the threshold entered exceeds the designated value during run mode. (If checked, red LED will flash.
47 Replacing microphone and windscreen Attaching/Detaching The Edge features a field replaceable microphone and a screw-on removable windscreen. 3M Quest suggests that the user replace the windscreen whenever dirt has accumulated on the windscreen prior to measuring data. NOTE: If you ordered an Edge kit, extra windscreen(s) will be included in your case. Attaching/Detaching the windscreen and microphone 1.
48 Technical Support Hard Hat Attachment Kit The following instructions explain how to assemble and attach the hard hat kit to a standard hard hat. A B Hard Hat Attachment kit A. Epaulette mount B. Hard hat mount 1. Using a 3/32” hex wrench, twist the top shoulder bolt counterclockwise to loosen and remove the bolt and the clip. Also, remove the bottom clip with the hex wrench. Once the bottom clip is removed, place the shoulder bolt back into its place and tighten back up with the hex wrench.
APPENDIX 49 A Appendix A SPECIFICATIONS **All specifications subject to change Pending testing approvals on the following: ANSI S1.25, IEC61252 Standards for Personal Sound Exposure Meters. Lead Free (RoHS compliant). Housing Plastic case with black, gray check background and red outlined buttons. Size 3.5” long x 2.1” wide x .75” thick (without microphone) (88 mm long x 53 mm wide x 19 mm thick) Weight 2.5 oz (less mounting device); (70.
50 Appendix A Life Approximately 60+ hours of continuous operation at normal operation under reference to environmental conditions when full capacity batteries are installed. Type Lithium Polymer (Flat cell) Memory capacity 180 hours The typical time interval needed to stabilize after changes in environmental conditions is 5 minutes for each 10 C change. Operating +14 ºF to + 122 ºF (-10 ºC to + 50ºC). Storage -13 ºF to + 140 ºF (-25 ºC to + 60 ºC).
51 Appendix A EdgeDock1 and EdgeDock5 are powered by a 12-volt charger adapter with international plug adapters. The backside of the Edge slides into the hook of the EdgeDock1 or EdgeDock5 with the mounting clasps rotating to a 90 degree angle (which will rest on a table/work area). Additionally, the EdgeDock1 (or EdgeDock5) are equipped with two single screw slots for wall mounting purposes. LED amber indicator Indicates EdgeDock1 or EdgeDock5 is “powered on”. (Lower of the 2 shown led’s).
52 Appendix A Displayed Data and status indicators SPL, Average value (Lavg or Leq), Maximum value (Lmx), Minimum value (LMn), Peak Value (Lpk), Exposure, Run Time, TWA, UL Time Dosimeters Up to two dosimeters at once (eg4), each with its own assignable profile (via QSP-II only).
53 Appendix A Calibration Pre-calibration When performed, valid prior to the start of the study. Post-calibration When performed, valid for the previous study. Storage Calibrations for a study are stored in the related study file. Calibrator requirement Calibrations should be performed at 114 dB at 1kHz. The Edge communicates via the EdgeDock1 and/or the EdgeDock5. Communications is supported via USB cable from the docking station to the PC.
54 Appendix A Analog Board 053-644, Rev E Page 54 eg4 & eg3
55 Appendix A Edge Block Diagram (continued) 053-644, Rev E Page 55 eg4 & eg3
56 Appendix A 3M Quest Service Should your 3M Quest Technologies equipment need to be returned for repair or for recalibration, please contact the service department at the following number or access the online form via the website. For technical issues, please contact Technical Support. Service Department and Technical Support: 1 (800) 245-0779. Fax: 1 (262) 567-4047. Office hours are 8:00 a.m. to 5:00 p.m. United States Central. E-mail: 3Mdetectionmail@mmm.com Internet: www.3M.
APPENDIX 57 B Appendix B Glossary of Terms Background Noise, effects of Background noise can cause considerable error in measurement when its level is high relative to the level of a noise source of interest. If you can make measurements both with and without the contribution of a noise source of interest, you can mathematically subtract the background noise from the combined measurement, yielding the level of the noise source of interest alone.
58 Appendix B Glossary of Terms Combining Noise sources Because sound levels are measured in decibels they cannot be simply added together. A sound level of 90dB plus 90dB does not yield 180dB but rather 93dB. The procedure for mathematically determining a combined level of sound from independent measurements made for two noise sources is given below. 1. Make independent measurements for both noise sources, where each exists without the presence of the other. 2.
59 Appendix B Glossary of Terms Criterion Time The time over which the Criterion Level is established, generally 8 hours. Decibel (dB) Sound Level Meters use the decibel as the unit of measure known as Sound Pressure Level (SPL). SPL uses the ratio between a reference level of 20 microPascals (.00002 Pascals) and the level being measured. SPL = 20 log (measured level/reference level). Example: the SPL for 1 Pascal is 20 log (1 Pascal/.00002 Pascal) = 94dB 20 microPascals (.
60 Appendix B Glossary of Terms Field Calibration (vs. Factory Calibration), pre-calibration, post-calibration To be sure the dosimeter is functioning within specified tolerance limits, it should be returned to the factory annually for a factory recalibration. To verify that the dosimeter is measuring properly during normal use, field calibrations should be performed. Pre-calibration is performed prior to any data being recorded by the dosimeter.
61 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.
62 Appendix B Glossary of Terms PEL (Permissible Exposure Level) The A-weighted sound level at which exposure for a Criterion Time, typically eight hours, accumulates a 100% noise dose. Projected Time The variable amount of time used to make a projected dose calculation from an actual dose measurement. Random incidence (microphone) This only applies to Class/Type 1 microphones. Measurements made in an area where sound waves are coming from all directions, including reflections and diffractions.
63 Appendix B Glossary of Terms Threshold The threshold affects the Lavg, TWA, and Dose measurements. All sound below the threshold is considered nonexistent noise for the averaging and integrating functions. The threshold does not affect measurements in the sound level mode. OSHA uses two different thresholds. The original Occupational Noise Exposure Standard (1971) used a 90dB threshold and called for engineering controls to reduce the noise levels if the eight-hour TWA was greater than 90dB.
64 Appendix B Glossary of Terms Weighting (A, C, Z, etc.) “A”, “B”, “C”, “Z” and LINEAR are the standard weighting networks available. These are frequency filters that cover the frequency range of human hearing (20Hz to 20 kHz). “A” weighting is the most commonly used filter in both industrial noise applications (OSHA) and community noise regulations. “A” weighted measurements are often reported as dBA. The “A” weighted filter attempts to make the dosimeter respond closer to the way the human ear hears.
65 Appendix B Glossary of Terms The following equations are used in the Edge calculations. Some of the terms used in these equations are explained in Table B-1 while others are explained above in the “Glossary of Terms” section. 100 RTIME ( LSCL ) /( ER ) 2 dt % 0 TC TC Prd DOSE % 8 hours RTIME DOSE Prd L hours DOSE Pr t RTIME % ER log 2LS / 3.
66 Index INDEX A Attaching the Edge ............................................................. 32 B Background Noise, effects of Defined ............................................................... 57 Battery Checking ............................................................. 33 Battery charge status ............................................... 38 Battery indicator icon................................................ 33 Positioning ..........................................................
67 Index M Maximum Level Defined ............................................................... 61 Measurement Range Defined ............................................................... 61 Memory storage symbol ........................................... 21 Model eg3 ........................................................................ 6 eg4 ........................................................................ 6 Mount the docking station ........................................
Quest Technologies, a 3M company, is a manufacturer of durable, reliable instrumentation and software systems that help monitor a variety of health and safety hazards, including noise, vibration, heat stress, indoor air quality and toxic/combustible gases. The 3M Quest brand of instrumentation is used by safety and industrial hygiene professionals to help comply with worker safety and environmental regulations and standards around the world.
