ER•200DW8 Personal Noise Dosimeter with Data Logging

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ER•200DW8 Personal Noise Dosimeter with Data Logging

Quick Overview

Etymotic takes the cost and complication out of noise dosimetry.


Availability: In stock


Sound level meters measure at discrete times, while dosimeters measure continually over time for a more accurate estimate of risk.

  • Color-coded LEDs indicate safe, borderline and high-risk exposures
  • Data table (text file) and printable reports (pdf file) are automatically created

For WIN8 or earlier

Compatible with:

  • Windows XP (SP2 or later)
  • Windows Vista (SP2 or later)
  • Windows 7 (SP1 or later)
  • Windows 8
  • Windows 8.1

Requires one of the following PDF readers:

  • Adobe Acrobat Reader (X or later)
  • Adobe Acrobat (X or later)
  • Adobe Acrobat Pro (X or later)

Upgrade to WIN8 version:

  • From XP to Win8: Send your dosimeter to Etymotic for calibration and upgrade ($99)
  • From WIN7 to WIN8: Purchase the DW8 Upgrade Package ($99) -- no need to return DW7

Programmable Features

  • Dose Criteria
    • NIOSH (85 dB criterion, 3 dB exchange rate, 75 dB threshold)
    • OSHA (90 dB criterion, 5 dB exchange rate, 80 dB threshold)
    • CUSTOM (User-defined criterion, exchange rate and threshold)
  • Run Time
    • 16 hours
    • 3 days
    • 5 days
    • 7 days
  • Power Button
    • Manual shutdown (default)
    • Option to disable (user cannot shut down)
  • LEDs
    • LEDs flash during run (default)
    • Option to disable (LEDs do not flash during run)
  • Memory Usage
    • Memory full: Previous results are overwritten (default)
    • Memory full: Results must be downloaded and cleared from the device

3 Modes of Operation

  • Status
    • Memory (adequate or full)
    • Battery (OK or low)
  • Normal
    • Programmable to 16 hours, 3, 5, 7 days
    • Auto power-off
  • Quick Check
    • 2-minute test calculates dose per hour
    • Estimates potential risk of over-exposure (e.g., high-noise areas, power tools, concerts, sporting events)

In the Box

  • ER-200DW8 Personal Noise Dosimeter
  • USB Cable
  • PC Interface Software CD
  • Windscreen
  • Batteries: Three AAAA Alkaline*
  • User Guide

*AAAA batteries are available at electronics retailers and at

Instructions For Use

Technical Specs

Technical Specifications

The default settings used by the ER-200D for calculation of noise dose are consistent with ANSI S1.25–1991 (R2002) Specification for Personal Noise Dosimeters and NIOSH Criteria for a Recommended Standard (NIOSH, 1998).

Calibration Accuracy ± 2.5 dB
Exchange Rate Programmable
Criterion Level Programmable
Threshold Level Programmable
Run Length Programmable
Frequency Weighting A
Response Slow
Temperature Range of Operation -10°C to 45°C (14°F to 113°F)
Omni-directional Microphone Flat from 100 Hz to 15 kHz
Power Supply Three AAAA batteries
RMS Detector Dynamic range 60 dB (70 to 130 dB)
Battery Life > 200 hours continuous use
  • PC software
  • USB cable
  • windscreens
  • user manual
  • three AAAA batteries

Importance of Monitoring

Hearing loss from loud sound affects millions of people. Noise-induced hearing loss is preventable, but most people don’t 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 meter is a device that measures noise at a particular point in time, while a dosimeter measures sound levels for many hours and calculates the cumulative 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.

In cases of gunfire and other impulse noise, no conventional dosimeter measures the risk accurately. More specialized equipment is required to measure impulse noise.

What the LEDs Mean

Status Check

Power ON

  • Press and release the power button one time. The 12.5% green LED illuminates briefly.
  • The previously measured noise dose is displayed (flashing LED).

Device status is displayed

Two Green LEDs
Battery is good;
memory capacity is acceptable
Two Green and one Yellow LED
Battery is low or
memory capacity is low
Two Red LEDs — 3 Possibilities
  • Battery is dead
  • Device memory is full
  • Hardware failure
2 Green
Green LEDs Caution
2 Green and
1 Yellow
Green & Yellow LEDs Warning
2 Red
Red LEDs

Reading the Display: What the LEDs Mean

LED Color

The dosimeter uses color-coded LEDs to display noise dose in percent.

All LEDs

Green (Safe): Noise dose is below 50%

Yellow (Borderline): Noise dose is greater than 50% and less than 100%

Red (High Risk): Noise dose is greater than 100%

LED Flash Rate In Normal mode:

  • A slow flashing LED at 12.5% means that the noise dose is at or below 12.5% (i.e., between 0% and 12.5%). A fast flash at 12.5% indicates the dose exceeds 12.5% (i.e., dose is between 12.5 and 25%)
  • LEDs 25% to 4x flash rapidly when that dose level is exceeded
  • For the bottom LED (8, 16, 32x):
    • Regular flash: dose exceeds 8x
    • Double flash: dose exceeds 16x
    • Fast continuous flash: dose exceeds 32x

In QuickCheck mode:

  • All LEDs are solid except the bottom LED, which flashes green to indicate QuickCheck mode.
  • If dose per hour exceeds 8x the bottom LED flashes alternately red and green.

Interpreting Results

Normal Mode (Based on NIOSH Criteria)

Normal Mode

QuickCheck Mode (Based on NIOSH Criteria)

QuickCheck Mode

In QuickCheck mode:

  • All LEDs are solid except the bottom LED, which flashes green to indicate QuickCheck mode.
  • If dose per hour exceeds 8x the bottom LED flashes alternately red and green.

Sample Report

ER-200D Personal Noise Dosimeter Sample Report

ER-200D Personal Noise Dosimeter Sample Report


The following accessories are compatible with this product:

ER200-30 Windscreen Kit

ER200-30 Windscreen Kit

2 windscreens for all dosimeter models

ER200BAT AAAA Batteries for Dosimeter

ER200BAT AAAA Batteries for Dosimeter

3 AAAA batteries for all Dosimeter models

ER200DW8-UP DW8 Upgrade Package

ER200DW8-UP DW8 Upgrade Package

Upgrade from Windows 7 to Windows 8 compatibility

ER200DOSOW8 Extra dosimeter for use with ER200DW8 system

ER200DOSOW8 Extra dosimeter for use with ER200DW8 system

Extra dosimeter for use with ER200DW8 system


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