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Quest Engineering The EDGE eg5 User Manual

Dosimeter
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The EDGE:
Copyright
This document is copyrighted by Quest Technologies, Inc. Permission is
hereby granted to copy and distribute this manual provided that this
Copyright Page is included. This grant does not include permission to
modify the manual's text or illustrations in any way.
This manual may not be translated without obtaining permission in
advance.
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Updates
In the interests of continuous product improvements, Quest Technologies
reserves the right to make changes to product specifications without notice.
To understand the latest updates that have been implemented into this
product and to download the most current version of this user manual, visit
our web site at www.quest-technologies.com.
Copyright © 2008 Quest Technologies, Inc.
053-669, Rev A
Quest Technologies, the Quest logo, and QuestSuite Professional II
are registered trademarks of Quest Technologies Incorporated. All
rights are reserved.
Microsoft and Windows are registered trademarks of Microsoft, Inc.
eg5 Model
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Summary of Contents for Quest Engineering The EDGE eg5

  • Page 1 The EDGE: eg5 Model Copyright This document is copyrighted by Quest Technologies, Inc. Permission is hereby granted to copy and distribute this manual provided that this Copyright Page is included. This grant does not include permission to modify the manual’s text or illustrations in any way. This manual may not be translated without obtaining permission in advance.
  • Page 2 eg5 Model User Warnings, Safety Markings, and Standard information Warnings concerning safe operation WARNING: To prevent ignition of flammable or combustible atmospheres, no user serviceable parts inside. Repair and battery replacement must be done by authorized service personnel only. WARNING: To reduce the risk of ignition of a flammable or explosive atmosphere, substitution of components may impair intrinsic safety.
  • Page 3  BATTERY POWER - recommended with First Use To improve accuracy of displayed battery life, run down the battery until it is fully discharged; then proceed with a full charge via the EdgeDock. Repeat this procedure every few months of use to keep the device updated with the current battery condition.

  • Page 4: Table Of Contents

    Table of Contents Table of Contents Table of Contents CHAPTER 1: INTRODUCTION ............1 Dosimetry ..................1 Noise dosimeter ..................2 Range of sound ................... 3 What do the standards say? ................. 3 Applications of the Edge................4 Noise assessment steps ................5 eg5 Overview ....................
  • Page 5 Table of Contents CHAPTER 3: SETTING-UP THE EDGE VIA QSP-II ......17 Noise studies................. 17 Understanding what data is stored ...............18 Summary data……………………………………………………………………………………………..….18 Time history....................19 Views on the Edge................. 20 Definitions of data log values and views ............20 Docking..................23 Communicating &...
  • Page 6 Table of Contents Stopping a study................44 Indicators/Icons on the display ..............44 Viewing measurements on the display......... 45 Locking or securing your dosimeter during run ..........45 Locking or Securing ..................46 Unlocking....................46 CHAPTER 5: VIEWING YOUR STUDIES IN QSP-II ...... 47 Retrieving your studies into QSP-II...............47 Where your studies are stored ............
  • Page 7 List of Figures Temperature ....................64 User Interface ................64 Display ......................64 Keypad ......................64 EdgeDock1 and EdgeDock5 ............65 Physical attributes of EdgeDock1 and EdgeDock5 ..........65 Measurements ................66 Types ......................66 Measurement parameters................66 Communications..................67 Special functions ..................67 Quest Service ................68 Contacting Quest Technologies ..............68 International customers ................68 Warranty ..................
  • Page 8 viii List of Figures Figure 3-5: New hardware wizard for Edge Dock.................24 Figure 3-6: Setting-up dosimeter parameters..................26 Figure 3-7: Changing the display via QSP-II ..................27 Figure 3-8: Setting the Edge to start automatically................28 Figure 3-9: Secure/Lock setting ......................30 Figure 3-10: Setting identity field ......................31 Figure 3-11: Identity screen .......................32 Figure 3-12: Clearing the dosimeter ....................33 Figure 3-13: Setting date and time in QSP-II ..................34...

  • Page 9: Chapter 1: Introduction

    CHAPTER Dosimetry Introduction Dosimetry 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.

  • Page 10: Noise Dosimeter

    Dosimetry Noise dosimeter 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.

  • Page 11: Range Of Sound

    Dosimetry Range of sound 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.

  • Page 12: Applications Of The Edge

    Dosimetry Applications of the Edge 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.

  • Page 13: Noise Assessment Steps

    Dosimetry Noise assessment steps 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.

  • Page 14: Eg5 Overview

    Dosimetry eg5 Overview eg5 Overview The “eg5” model is an intrinsically safe instrument featuring simultaneous C and A weighted measurements. The instrument will also calculate C-A. The “eg5” 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.

  • Page 15: Chapter 2: Getting Started

    CHAPTER Checking the equipment eg5 Overview Getting started This chapter is designed to guide you through basic information you will need to begin logging your studies. Checking the equipment 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.

  • Page 16: Turning On

    Turning on LED indicator Turning on 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. “eg5”) and firmware version.

  • Page 17: Navigating

    Turning off LED indicator Table 2-1 explains when and why the LED indicator color will appear. NOTE: The LED indicator can be disabled via QSP-II (see section, “ Explanation of setting LED in QSP-II”, page 25) LED indicator Explanation A flashing red LED indicates the dose has exceeded the alarm level.

  • Page 18: Display And Keypad

    Display and keypad Diagram Display and keypad The keypad is used to run and stop your studies, view your measurement values, and power on and off the dosimeter. Diagram The following diagram explains the features on the display and keypad. Windscreen and microphone LED indicator ...

  • Page 19: Questsuite Professional Ii Software

    QuestSuite Professional II software Loading QuestSuite Professional II software QuestSuite Professional II (QSP-II) is a software application designed by Quest Technologies that runs under the Windows operating system. You can use QSP-II for a variety of functions related to the Edge dosimeter and with many other Quest instruments.

  • Page 20: Docking Station Components

    Docking station functionality Docking station components Docking station components The table below explains the EdgeDock1 or EdgeDock5 LED indicators, power connector, USB connector, and contact pins. Docking station Explanation components Charging indicator Identifies if the dosimeter is “charging” or “fully charged”. A red blinking LED indicates the dosimeter is charging.

  • Page 21: Powering Edgedock1 Or Edgedock5

    Docking station functionality Powering EdgeDock1 or EdgeDock5 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).

  • Page 22: Charging Your Dosimeter

    Docking station functionality Charging your dosimeter Charging your dosimeter The number of hours you have used your dosimeter from your last charge impact your total charge time. For example, if the battery clock will 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.

  • Page 23: Mounting The Docking Station To A Wall

    Docking station functionality Mounting the docking station to a wall 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.
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  • Page 25: Chapter 3: Setting-Up The Edge Via Qsp-Ii

    CHAPTER Noise studies Storing the dosimeter Chapter 3: Setting-up the Edge via QSP-II Noise studies The eg5 model comes equipped with two customizable user setups. You have the option to customize the parameters for threshold values, exchange rate values, filtering, C-A measuring, an upper limit value, and a criterion level.

  • Page 26: Understanding What Data Is Stored

    Noise studies Understanding what data is stored Understanding what data is stored When you are running noise dosimetry studies, there are two types of data stored on the dosimeter. These two types of data are: Summary data and Time History (or Logged) data. Summary data Summary data represents values that occurred over the entire run of the study.

  • Page 27: Time History

    Noise studies Time history Time history data is also referred as “logged data” which plots measurement values in minute by minute intervals. Time History data represents values that occurred over the most recent time period, which is the logging interval. For example, if the log interval is 1 minute, then the Peak value is the highest Peak value for that 1 minute, and the Lavg value is the average dB value for that 1 minute.

  • Page 28: Views On The Edge

    Views on the Edge Definitions of data log values and views Views on the Edge The Edge is a user-friendly and customizable dosimeter. With a simple click of a checkbox in QSP-II, you can select the appropriate measurement values or views to appear or not appear on the display of your dosimeter.
  • Page 29 Views on the Edge Definitions of data log values and views Views on the Explanation Edge 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 5dB exchange rate.

  • Page 30: Table 3-2: Dosimeter Measurement Descriptors/Variants

    Views on the Edge Definitions of data log values and views Views on the Explanation Edge  Memory storage symbol –  eg5: The eg5 model displays the total memory storage remaining in hours and minutes. For example, if it displays the memory symbol 100:50 this represents 100 hours and 50 minutes of memory storage remaining on the dosimeter.

  • Page 31: Docking

    Docking Communicating & downloading data 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 ...

  • Page 32: Figure 3-5: New Hardware Wizard For Edge Dock

    Docking 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.

  • Page 33: Customizing Set-Up Parameters In Qsp-Ii

    Customizing set-up parameters in QSP-II Dosimeter setting Customizing set-up parameters in QSP-II Customizing and saving set-ups are performed via QSP-II. The following sections discuss each of the setup screens and explain how to save and send the parameters to the dosimeter(s). ...

  • Page 34: Figure 3-6: Setting-Up Dosimeter Parameters

    Customizing set-up parameters in QSP-II Dosimeter setting To enable/disable the LED indicators (if disabled, the Edge will conserve more power) refer to the following If “Alarm enable” is checked for the Dose %, then the dosimeter  LED will flash red when the dose value exceeds the designated dose value entered.

  • Page 35: Customizing Your Views (Display Setting)

    Customizing set-up parameters in QSP-II Customizing your views (Display setting) Or click Save As to save the new set-up, assign a name, and click Ok. Then, click on Send Setup to Instrument button. The status field will update stating it transferred and “complete!”...

  • Page 36: Auto On Setting

    Customizing set-up parameters in QSP-II Auto On setting To change other settings, see next sections (setting display, set-up, auto on, security, or clear). Or click Save As to save the new set-up and name the settings. Alternatively, click Save to change the Edge setup under “Saved ...

  • Page 37: Security: Setting Secure/Lock During Your Run

    Customizing set-up parameters in QSP-II Security: setting secure/lock during your run  NOTE: in order for the auto-on mode to commence, the dosimeter must be turned off. Security: setting secure/lock during your run You can prevent people from inadvertently terminating a study or changing settings with the lock feature enabled.

  • Page 38: Figure 3-9: Secure/Lock Setting

    Customizing set-up parameters in QSP-II Security: setting secure/lock during your run How to set-up secure/lock  Ensure the Edge is docked and the USB cable is connected from the pc to the EdgeDock. From the welcome screen of QSP-II, select the Edge and click on the Setup button (see Figure 3-1, page 17).

  • Page 39: Figure 3-10: Setting Identity Field

    Customizing set-up parameters in QSP-II Security: setting secure/lock during your run Naming your dosimeter (identity setting) With the identity setting on the Edge, you have the option of adding a name to the dosimeter. This is a very useful feature if, for example, you have a handful of dosimeters or a couple hundred dosimeters and you want to track who is assigned to each specific dosimeter.

  • Page 40: Figure 3-11: Identity Screen

    Customizing set-up parameters in QSP-II Security: setting secure/lock during your run 4. Click on eg5 (if not selected), click on Commands tab and then click on Identity tab. 5. In the Identity screen, type in a name/ numbers in the identity string field.

  • Page 41: Clearing The Dosimeter

    Customizing set-up parameters in QSP-II Clearing the dosimeter Clearing the dosimeter To clear your data, also referred to as resetting your data, ensure your Edge is docked and you are viewing the setup screen in QSP-II. How to clear/reset your data ...

  • Page 42: Set Time Setting

    Customizing set-up parameters in QSP-II Set Time setting Set Time setting As you begin using the Edge, you will want to set the date and time which is performed via QSP-II setup. There are two methods to set the time parameters which are explained in the steps below.

  • Page 43: Qsp-Ii: Updating Edge Firmware

    Customizing set-up parameters in QSP-II QSP-II: Updating Edge firmware QSP-II: Updating Edge firmware Latest firmware (i.e., software) releases are available in the Setup screens via the “Update” screen. When updating, only one dosimeter can be updated at a time and must be updated in bay 1 of an EdgeDock5. (For users with an EdgeDock1, this will not be a concern.) Please follow the steps below and refer to Figure 3-14.
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  • Page 45: Chapter 4: Running And Operating Your Dosimeter

    CHAPTER Overview of running a study Running and operating your dosimeter As explained in Chapter 3, the view of your display is customizable via QSP- ✍ NOTE: The subsequent sections show examples of views which you may have disabled on your dosimeter. (Please refer to Chapter 3, “Setting up the Edge via QSP-II”.) Overview of running a study The list below is a brief overview of the steps for running a study.

  • Page 46: Positioning The Edge On Your Shirt

    Overview of running a study Positioning the Edge on your shirt 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.

  • Page 47: Checking Battery Power

    Overview of running a study Checking battery power Checking battery power Typically, the life of the battery is approximately 40 hours nominal without LED activated (see Appendix A for specific specifications). It is recommended to perform a daily download of the measured data while simultaneously charging the battery for maximum efficiency.

  • Page 48: Calibrating

    Overview of running a study Calibrating Calibrating 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.

  • Page 49: Resetting The Dosimeter

    Overview of running a study Resetting the dosimeter 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.

  • Page 50: Setting Contrast On Dosimeter

    Overview of running a study Setting contrast on dosimeter A 3, 2, 1 countdown will appear, and then a shaded bar will appear indicating the dosimeter is being reset. 6. Press the down arrow until the checkmark icon is selected (denoted by the arrows).

  • Page 51: Running Studies

    Running studies Starting a run Running studies 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).

  • Page 52: Stopping A Study

    Stopping a study Indicators/Icons on the display Stopping a study 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.

  • Page 53: Viewing Measurements On The Display

    Viewing measurements on the display Locking or securing your dosimeter during run Viewing measurements on the display 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 20). ...

  • Page 54: Locking Or Securing

    Viewing measurements on the display Locking or Securing Locking or Securing  How to lock or secure 1. Turn the dosimeter on and press the run/stop button to begin logging your study. 2. To enable the lock, press run/stop button three consecutive times within one second intervals.

  • Page 55: Chapter 5: Viewing Your Studies In Qsp-Ii

    CHAPTER Viewing measurements on the display Retrieving your studies into QSP-II Viewing your studies in QSP-II The focus of this chapter is to discuss how to view your studies via QuestSuite Professional II software. 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 studies.

  • Page 56: Figure 5-2: Retrieve Data Screen In Qsp-Ii

    Viewing measurements on the display Retrieving your studies into QSP-II 6. Click on Select All (under Edge Units) if using EdgeDock1.  If you are using EdgeDock5, click on the appropriate dosimeter name which appears under Edge Units section (i.e., beta-001). Instrument download screen Load from file screen Select All...

  • Page 57: Where Your Studies Are Stored

    Where your studies are stored Downloaded Node Where your studies are stored Downloaded Node When you sync the dosimeter to the software and retrieve the files into QSP-II (as explained above in “Retrieving your studies from QSP-II”), these studies are automatically stored under the node titled “Downloaded”...

  • Page 58: Viewing Your Edge Data In Qsp-Ii

    Where your studies are stored Viewing your Edge data in QSP-II  How to retrieve past data/studies 1. From the start-up screen in QSP-II, choose Acoustics from My instruments section. Select the Edge dosimeter. 2. Select the Retrieve Data button. 3.

  • Page 59: Table 5-1: Downloading Data In Qsp-Ii Explained

    Where your studies are stored Viewing your Edge data in QSP-II Filing system Explanation Organizer Node Used to organize your noise studies. When studies are first retrieved/downloaded they are stored under the “Downloaded Node”. You can organize your studies into topics as you may do with your email system or your computer files.

  • Page 60: Figure 5-5: Viewing Layout View (Charts And Graphs) In Qsp-Ii

    Where your studies are stored Viewing your Edge data in QSP-II 4. The right-side pane displays graphs and charts which are customizable via the layout icon toolbar. (For further information, please refer to QSP-II’s Help Contents.) Figure 5-5: Viewing layout view (charts and graphs) in QSP-II Graphs &...

  • Page 61: Adding Panels (Charts/Graphs)

    Adding panels (charts/graphs) Viewing your Edge data in QSP-II Adding panels (charts/graphs) 1. Ensure you selected the appropriate study and are viewing panels (graphs/charts) on the right-hand side of your screen. 2. Click on the Add icon. 3. Select a chart or graph. An edit screen may appear. Select the appropriate settings and click Ok.

  • Page 62: Creating Reports

    Creating reports Creating reports QSP-II reports are saved in Adobe PDF format for easy viewing and printing. ✍ NOTE: The report will print in the order that the panels (charts/graphs) appear on your computer screen. To rearrange, click on the title of a chart or table, drag, and drop a chart/table on the title bar of a panel.

  • Page 63: Viewing And Printing Reports

    Creating reports Viewing and printing reports Viewing and printing reports Generating a Session or Study Report  Right-click a Session or Study and select Print Session from the menu.  The report will dock under the study node.  To remove, right-click the report and click Delete Report. ...
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  • Page 65: Chapter 6: Technical Support

    CHAPTER Technical Support Technical Support Setting up and Viewing C-A measurements With the eg5 model, you have the option of enabling c-a measurement and viewing the values in tables and charts (also called “panels”). For your setup parameters, c-a is selected via the Setup button of QSP- II’s dosimeter screen.

  • Page 66: Figure 6-2: Selecting Downloaded Study Data

    Technical Support In order to view C-A measurements, you will have to edit the panel and turn this feature on to view. Please follow the steps below. 1. From the downloaded node, expand the Edge files to view the study data. Three panels will appear as your default view which includes ...

  • Page 67: Figure 6-4: Adding C-A To View In Logged Data Chart

    Technical Support 3. Click on the System tab and click in the c-a checkbox. Click Ok. System tab Lc-a Figure 6-4: Adding C-A to view in logged data chart 4. The C-A measurement will appear in the selected panel you selected.

  • Page 68: Led Indicator: Disable/Enable

    Technical Support LED indicator: disable/enable 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 threshold ...

  • Page 69: Replacing Microphone And Windscreen

    Technical Support Replacing microphone and windscreen Attaching/Detaching The Edge features a field replaceable microphone and a screw-on removable windscreen. ✍ NOTE: If you ordered an Edge kit, extra windscreen(s) will be included in your case.  Attaching/Detaching the windscreen and microphone 1.
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  • Page 71: Appendix A: Specifications

    APPENDIX Appendix A SPECIFICATIONS **All specifications subject to change Standards  ANSI S1.25 Personal Noise Dosimeters  IEC61252 Personal Sound Exposure Meters  RoHS compliant  Intrinsic safety:  IEC 60079-0:2004 and IEC 60079-11:2006  MSHA, ATEX, UL, cUL (Pending) Safety Markings Manufacturer Quest Technologies...

  • Page 72: Power/Electrical Characteristics

    Appendix A Power/Electrical characteristics Life Approximately 40 hours nominal of continuous operation at normal operation without LED activated under reference to environmental conditions when full capacity batteries are installed. It is recommended to charge the battery frequently for maximum efficiency. Type Lithium Polymer (Flat cell) Memory capacity...

  • Page 73: Edgedock1 And Edgedock5

    Appendix A EdgeDock1 and EdgeDock5 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).

  • Page 74: Measurements

    Appendix A Measurements Types Displayed Data and SPL, Average value (L or L ), Maximum value (L status indicators Minimum value (L ), Peak Value (L ), Exposure, Run Time, TWA, UL Time, L Measurement parameters Dosimeters Up to two dosimeters at once (eg5), each with its own assignable profile (via QSP-II only).

  • Page 75: Communications

    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. Communications The Edge communicates via the EdgeDock1 and/or the EdgeDock5.

  • Page 76: Quest Service

    Appendix A Quest Service Contacting Quest Technologies Should your 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.

  • Page 77: Warranty

    Appendix A Warranty Quest Technologies warrants our instruments to be free from defects in materials and workmanship for one year under normal conditions of use and service. For United States customers, we will replace or repair (our option) defective instruments at no charge, excluding batteries, abuse, misuse, alterations, physical damage, or instruments previously repaired by other than Quest Technologies.
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  • Page 79: Appendix B: Glossary Of Terms

    APPENDIX Appendix B Glossary of Terms 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.
  • Page 80 Appendix B Warranty The C-A measurement is an L that enhances the low- frequency components of the sound signal. It is the result of subtracting an A-weighted L from a simultaneously collected C-weighted L and is sometimes used as the NRR (noise reduction rating) factor to determine if hearing protection devices are adequate for usage in the field.
  • Page 81 Appendix B Warranty Crest Factor Crest Factor is the ratio of the instantaneous peak value of a wave to its RMS value. This is a performance specification of a meter’s ability to process signals that have peaks that are substantially higher than their RMS averages.
  • Page 82 Appendix B Warranty number to work with because it is linear with respect to time. Example: If a 0.5-hour sample results in 9% dose and the workday is 7.5 hours long, then the dose for the full workday would be a 135% dose (7.5 / 0.5 x 9%).

  • Page 83: Measurement Range

    Appendix B Warranty threshold during the one hour period, then the Lavg would not indicate any reading at all. If 80 dB was exceeded for only a few seconds due to a telephone ringing near the instrument, then only those seconds will contribute to the Lavg resulting in a level perhaps around 40 dB (notably lower than the actual levels in the environment).

  • Page 84: Response Time

    Appendix B Warranty 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. PEL (Permissible Exposure Level) The A-weighted sound level at which exposure for a Criterion Time, typically eight hours, accumulates a 100% noise dose.
  • Page 85 Appendix B Warranty 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.
  • Page 86 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.

  • Page 87: Index

    Index INDEX Attaching Date the Edge ..........38 Setting ..........34 Auto On Decibel (dB) Setting ..........28 Defined..........73 Auto-on Docking station ........23 Running ..........29 Components ........12 Dose Defined..........73 Dose % indicator LED......9,26 Dosimeter1 & 2 Background Noise, effects of Setting ..........
  • Page 88 Index Memory storage symbol ......22 Mount the docking station ......15 Get Identity........... 32 Naming setup ........26 Naming your dosimeter ......31 Hearing Conservation Noise Floor Defined ..........74 Heartbeat..........60 Defined..........75 Heartbeat enable/disable ....... 26 Hertz Defined ..........74 Options menu ........41, 42 Overload..........44 Identity setting ........
  • Page 89 Index Response Time Battery power clock ......22 Calendar..........22 Defined ..........76 Retrieve data........23, 47 memory storage ........22 Defined ..........76 Run indicator......... 43 Run mode ..........44 Threshold Running a study Defined..........77 Overview..........37 Enable/disable........ 26,60 Running studies Time Steps............

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