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Etymotic
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ER-200
User Manual
11 pgs213.59 Kb0

Etymotic ER-200 User Manual

ETYMOTIC RESEARCH INC.
Personal Noise Dosimeter
ER-200
User Guide
Firmware Version 6.1
TABLE OF CONTENTS
Getting Started
Package Contents ......................................................................................5
Identification of Parts ................................................................................5
Battery Insertion ........................................................................................5
Windscreen ................................................................................................5
Operating Instructions
............................................................................
6-7
Normal Mode ............................................................................................6
Interpreting Results—Normal Mode........................................................6
Quick Check ..............................................................................................7
Interpreting Results—Quick Check ......................................................7
Reading the Display
....................................................................................8
What the LEDs Mean..................................................................................8
te ..........................................................................................................8
Ra
What Dose % Means ................................................................................8
Auto Shut Off Low Battery Indicator
................................................................................................9
..................................................................................9
Data Logging ................................................................................................9
Direct Electrical Input ..................................................................................9
Specifications ............................................................................................10
Warranty ....................................................................................................11
FCC & Industry Canada Statements ..........................................................11
Risk Factors for Hearing Loss ..................................................................11
3
Introduction
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Hearing loss from exposure to loud sound affects millions of people. Noise-induced hearing loss is preventable, but most people do not know how long they can listen to loud sound without risking hearing damage. A single noise exposure may not result in hearing loss, but permanent damage to the inner ear from noise adds up over time. The accumulation of too much noise day by day, year after year, is the determining factor in hearing loss risk. A sound level measures noise a
t a particular point in time, while a dosimeter measures sound
levels for many hours and calculates the cumula
meter is a device that
tive noise dose in percent.
Daily noise dose is determined by both the intensity of the sound and the amount of exposure time. A 100% dose means that a person has reached the maximum noise exposure for the day, and continued exposure to loud sound could lead to hearing loss. Ideally, hearing protection should be used before the dose reaches 100% since dose limits are based on averages, and some ears are more susceptible to noise damage than others. When the noise dose exceeds 50% a person has reached half the maximum noise exposure for the day and it’ s a good idea to use hearing protection to prevent over-exposure, particularly if a 50% dose reading is reached early in the day.
General Description
The ER-200 Personal Noise Dosimeter complies with most but not all of the requirements of a Type-2 Noise Dosimeter [ANSI S1.25-1991(R2002) ]. It is an inexpensive, easy-to-use screening device that provides a good estimate of noise dose and alerts the user to the risk of over exposure. In cases of gunfire and other impulse noise, no conventional dosimeter measures the risk accura tely because more specialized equipment is required.
The ER-200 has two modes of operation: Normal Mode measures and displays noise dose continuously for up to 16 hours, and Quick Check measures noise for two minutes, then calculates and displays the estimated dose per hour.
In Normal Mode, the dosimeter provides an early warning tha t the user is
pproaching over exposure and should use hearing protection. Quick Check
a provides a quick and easy way to measure a specific noise source to determine if permissible exposure levels will be exceeded (e.g., loud equipment, vehicles, power tools, music concerts or sporting events).
4
Getting Started
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Package Contents:
• ER-200 Personal Noise Dosimeter
• Windscreen
• Batteries: Three AAAA Alkaline*
• User Guide
• Reference Card
(AAAA batteries are available at retail locations and electronics retailers such as Radio Shack)
*
Identification of Parts
LEDs
Input jack
Microphone
Power
Front
Battery Insertion
On the back side of the dosimeter, locate the arrow on the battery compartment.
• Press down and slide the cover off
• Insert three AAAA batteries (supplied)
• Replace cover
Battery compartment
Windscreen
For accurate measurements, the 35 mm (1.4") windscreen included with the ER-200 should be used when noise is measured outdoors or near any turbulence, e.g., from a fan. The foam windscreen allows accurate measurement in winds up to 15 to 20 mph. Note: Blowing across the microphone opening on the dosimeter can cause the same turbulence as a 50 mph wind.
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