Extech Instruments 407355 Manuel utilisateur

User's Guide

Noise Dosimeter with PC Interface

Model 407355

Introduction

Congratulations on your purchase of the Extech 407355 Personal Noise Dosimeter. The

407355 is designed to test noise exposure in accordance with OSHA, MSHA, DOD,

ACGIH, and ISO standards. Fast and easy on-site surveys help determine noise

reduction requirements. The meter can also be used in SLM (sound level meter) mode

where sound pressure levels are monitored from 70 to 140dB. The SLM (sound level

meter) mode has a datalogging feature that can record up to 8800 readings which can

be downloaded to a PC for analysis. Note: In DOSIMETER mode, the individual

measurements are NOT datalogged and cannot be recalled.

The built-in RS-232 PC interface offers the following capabilities:

In SOUND LEVEL METER (SLM) MODE: The meter can be connected to PC while

taking measurements so that readings can be stored in a file and readings can be

viewed in a variety of display configurations (graph, list, etc.).

In DOSIMETER mode: The meter can perform a noise survey after which the user

can transfer the survey data to a PC.

Careful use of this device will provide years of reliable service.

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407355 Version 2.4 9/072

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for one year from date of shipment (a six month limited warranty

applies to sensors and cables). If it should become necessary to return the instrument for

service during or beyond the warranty period, contact the Customer Service Department at

(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact

information. A Return Authorization (RA) number must be issued before any product is

returned to Extech. The sender is responsible for shipping charges, freight, insurance and

proper packaging to prevent damage in transit. This warranty does not apply to defects

resulting from action of the user such as misuse, improper wiring, operation outside of

specification, improper maintenance or repair, or unauthorized modification. Extech

specifically disclaims any implied warranties or merchantability or fitness for a specific

purpose and will not be liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the product. The warranty set

forth above is inclusive and no other warranty, whether written or oral, is expressed or

implied.

CE Certification

The CE-mark indicates compliance to the EMC directive

Safety EN 61010-1 (1993) and IEC 1010-1 (1990); Safety requirements for

electrical equipment for measurement, control, and laboratory use

EMC Emission EN 50081-1 (1992): Generic emission standard

Part 1: Residential, commercial, and light industry

EN 50081-2 (1993): Generic emission standard

Part 2: Industrial environment

CISPR22 (1993): Radio disturbance characteristics of information

technology equipment. Class B limits.

FCC rules, part 15: Complies with the limits for a Class B digital device

EMC Immunity EN 50082-1 (1992): Generic immunity standard

Part 1: Residential, commercial, and light industry

RF immunity implies that sound level indications of 70dB or greater will

be affected by no more than ±1.5dB

EN 50082-2 (1995): Generic immunity standard

Part 2: Industrial environment

RF immunity implies that sound level indications of 70dB or greater will

be affected by no more than ±1.5dB

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407355 Version 2.4 9/073

Specifications

Display Multi-function LCD

Units of measure dBA (‘A’ weighted decibels) for sound level

% DOSE for accumulated noise exposure

Measurement ranges 70 to 140dBA for sound level (SPL) measurements

0.01 to 9999 %DOSE for noise exposure surveys

Standards applied ANSI S1.25-1991 A-weighting; ISO-1999; BS 6402: 1983

Criterion level 80, 84, 85, and 90dB (selectable)

Threshold level 70 to 90dB in 1dB steps (selectable)

Exchange rate 3, 4, 5, and 6dB (selectable)

High level detector appears on LCD when measurement exceeds 115dBA

Peak flag PK appears on LCD when measurement exceeds 140dBA

Accuracy ±1.5dB

Frequency weighting ‘A’ weighting

Frequency response 31.5Hz to 8 kHz

Response time F(FAST) and S(SLOW) selectable

Datalogging capacity 8800 sets

Operating Temperature 32 to 122oF (0 to 50oC)

Operating Humidity 10 to 90% RH

Storage Temperature 14 to 140oF (-10 to 60oC)

Storage Humidity 10 to 75% RH

Battery power Four (4) 1.5V ‘AAA’ batteries

Battery life 40 hours (approx.)

Dimensions 4.2 (L) x 2.4 (W) x 1.3 (H)"

106 (L) x 60 (W) x 34 (H) mm

Weight Approx. 12.3 oz. (350g) with batteries

Descriptions

Display Description

1. FAST Response Time mode

2. SLOW Response Time mode

3. Noise Exposure test active

4. Memory mode alert

5. Noise Exposure test paused

6. Unit of measure for Noise Exposure test

7. Battery Status Indicator

8. Event memory banks (E1-E5)

9. 115dB limit (headphone) indicator

10. Numerical display digits

11. Unit of measure for sound level readings

12. 140dB PEAK indicator

13. Elapsed time mode for noise exposure tests

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407355 Version 2.4 9/074

Meter Description

1. Microphone (lapel clip not shown)

2. Microphone cable

3. Microphone connector

4. LCD display

5. Push-buttons:

ON-OFF Press to turn the meter ON; Press and hold

to turn the meter OFF.

RESET This button has a variety of uses including

clearing stored data and accessing the Programming

mode as described in the manual.

RUN Press to begin a noise survey test in Dosimeter

mode or datalogging in SLM mode. Also used as the

Left Arrow in the Programming mode

CLOCK Press to view the Date and Time. Also used

as the Right Arrow in Programming mode

MODE Press to select ELAPSED TIMER, SLM (dBA)

mode, or noise survey (%DOSE) mode. Also used as

the Down Arrow in the Programming mode

EVENT Press to select a memory bank (E1 through

E5). Also used as the Up Arrow in the Programming

mode

6. RS-232 PC Interface plug

7. RS-232 PC Interface jack

8. Calibration potentiometer

9. Battery compartment screw

10. Belt clip / Battery compartment cover

11. Battery compartment

12. Microphone jack

13. Housing screws (service personnel only)

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407355 Version 2.4 9/075

Operation

Getting Started

1. Power the instrument by pressing the green button.

2. When the unit is turned on, all display annunciators switch on briefly followed by

‘dOSE’, the Criterion Level (Lc), Threshold Level (Lt), and Exchange Rate (ER)

respectively. These parameters are defined in the Noise Exposure related sections of

this manual.

3. If the meter does not switch on when the power button is pressed, check that the

batteries are installed and are fresh. Refer to the Battery Replacement section of this

manual.

4. To turn the meter OFF, press and hold the green power button; the display will count

down from 3dB to 0dB and then switch off.

5. The 407355 can be used as a Sound Level Meter or a Dosimeter.

Sound Level Meter Operation (dBA)

Press the MODE button repeatedly until the unit of measure is dBA (A-weighted decibels).

In SLM mode the meter operates as a Type 2 sound level meter. The 407355 measures

and displays sound pressure levels from 70 to 140dB. Read the measured sound level on

the LCD. For Sound Level measurements < 68dBA the LCD will display dashed lines. For

readings > 115dBA, the headphone icon appears. For readings > 140dBA, the Peak

Detector PK icon appears.

Datalogging

In Sound Level Meter (dBA) mode, the internal memory of the meter can store up to 8800

readings. Press the RUN key to start recording the measured readings. The MEM icon will

appear in the display. To stop datalogging, press the RUN key again. The MEM icon will

no longer be displayed on the screen. To download the data to a PC, refer to the PC

Interface section in this manual.

Note: If the low battery mark is flashing or Dosimeter surveys E1 through E5 have been

saved in memory, the datalogging function will not operate. The memory must be cleared.

To clear memory, turn the meter off then hold down the RUN key and turn the meter on. E-

EP will appear in the display to indicate that all memory data has been cleared.

Dosimeter Operation (Accumulated Noise Exposure - %DOSE)

1. Program the Response Time (Fast or Slow), Criterion Level (Lc), Exchange Rate (ER),

and Threshold Level (Lt) manually (see Programming section) or through the supplied

software (see PC Interface section).

2. Use the MODE button to select %DOSE as the unit of measure.

3. Select an unused Event Bank (E1 through E5) using the EVENT button.

4. Attach the meter to the user’s belt buckle, breast pocket, or where convenient

5. Clip the microphone as close as possible to the user’s ear (shirt collar, for example)

using the lapel clip.

6. Route the cable as to not hinder the working movements of the user.

7. Press the RUN button to begin measuring accumulated noise exposure. The Clock

display icon will switch on.

8. Press the RUN button momentarily to PAUSE the test (PAUSE display icon will switch

on). Press the RUN button again to resume the test (PAUSE icon will switch off).

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407355 Version 2.4 9/076

9. Use the MODE button at any time to view the elapsed time of the test. Press the

MODE button until the TIME display icon appears. Now the elapsed time will appear in

hours and minutes. Press the RUN button again to return to the %DOSE display.

10. To end the noise survey, press and hold the RUN key for 3 seconds. Read the

accumulated noise exposure value on the LCD.

11. Testing notes:

Never shout into the microphone as this will affect the test.

To obtain reliable data, the user’s activities must reflect a typical working day.

For best results, test over the course of several days and average the %DOSE

Refer to the dosimetry parameter descriptions below:

Event Select

Press the EVENT button to enter the EVENT mode. Each time the EVENT button is

pressed the LCD increments the Event bank (E1 through E5). Each bank is a memory

location. The user can store (or write over) the data in any of these locations. Each bank

location (E1, for example) is displayed on the LCD along with the stored data. If data is

present in a bank, the bank ID blinks. To erase data in a bank, press and hold the RESET

button until the display ID stops blinking.

% DOSE

The unit of measure, % DOSE, is used to quantify noise exposure measured during a

work shift. 100% dose is the maximum allowable noise exposure in accordance with

OSHA, MSHA, DOD, ACGIH, and ISO standards. Most standards specify Criterion

Level, Exchange Rate, Response Time, and Frequency weighting for the dosimeter as

discussed next.

CRITERION LEVEL (Lc)

To take an on-site noise exposure survey in accordance with standards such as OSHA

and MSHA, the dosimeter’s Criterion Level must first be set. The 100% DOSE

parameter discussed above is determined by the following equation: 100% DOSE =

Criterion Level for 8 hours. Each country has a unique Criterion Level (most countries,

including the U.S., use 90dB). The Criterion level is selectable (80, 84, 85, or 90dB).

Select the appropriate level per the Programming section of this manual.

EXCHANGE RATE (ER)

Exchange rate is best illustrated by example; refer to the following example: Since

100% DOSE = Criterion Level for 8 hours, a person would receive 50% DOSE in 4

hours if the noise level equals the Criterion Level setting. Now consider a Criterion

Level of 90dB, a noise measurement of 95dB (5dBA higher than the Criterion Level),

and an Exchange Rate of 5dB; in this example a 100% DOSE would be received in

only 4 hours. This is because with a 5dB Exchange Rate, a 5dB increase in sound level

is considered a doubling of the DOSE. Other Exchange Rates can be selected (3, 4, 5,

or 6dB). Refer to the local regulations or standards.

FAST (F) SLOW (S) RESPONSE TIME

Set the response time to Fast (F) to capture quick bursts of sound such as discharging

firearms, fireworks, hammering, and other impulse noises. Use the Slow (S) setting if

the noise under test is more of a continuous drone or background din. The Slow setting

is typically specified by OSHA and MSHA standards for use in noise surveys. Refer to

the Programming section of this manual to set the response time.

THRESHOLD LEVEL (Lt)

The threshold level is the sound level at which the 407354 begins to integrate noise into

the exposure test. For example, if the threshold level (Lt) is set to 85dB, the meter will

integrate all noise that equals or exceeds 85 dB. Sound levels below this threshold

would not be included in the dose calculation. See the Programming section to change

the level. The Threshold Level can be set from 70 to 90dB in 1 dB steps.

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407355 Version 2.4 9/077

0_7_

0_8_

0_3_

PEAK FLAG

When sound levels above 140dB are present the meter displays the PK symbol

HIGH LEVEL INDICATOR

When sound levels above 115dB are present the meter displays the headphone

symbol

Real Time Clock

Press the CLOCK key to display the current Day and Time accompanied by the TIME icon

blinking. Note that the DATE and TIME settings are saved when the meter is turned off. To

set the TIME and DATE refer to the Programming section.

Manual Programming

NOTE: The meter can be automatically programmed using the supplied software. Refer to

the PC interface sections for details. Specifically, the OCCUPATIONAL NOISE

EXPOSURE STANDARD software window can be used to configure the meter with one

click of the mouse. To Manually Program the meter, follow these steps:

1. To access the programming mode, start with the 407355 power off.

2. Press and hold the (RESET) button while turning the instrument on.

3. Release the RESET button when SEP (Setting Parameters) appears.

4. Use the left and right arrow buttons to select the desired parameter

5. Use the up and down arrow buttons to change a parameter’s setting

6. Refer to the parameter display symbols and their definitions below. These parameters

are discussed throughout this manual

(Criterion Level): 80, 84, 85, 90dB selections

(Threshold Level): 70 to 90dB selectable in 1dB steps

(Exchange Rate): 3, 4, 5, and 6 dB selections

First two digits of calendar year

Last two digits of calendar year

Calendar Month

Day of the Month

Hour of the day

Minutes

Slow (1 second) and Fast (125ms) response time settings

7. Press the button to exit the programming mode. Changes made in the programming

mode will be saved upon exiting. Note that settings are not lost when the meter is

turned off.

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407355 Version 2.4 9/078

Calibration Procedure

Note that an acoustical calibrator (such as the Extech 407744 or 407766) is required to

calibrate the 407355. Extech Instruments can also calibrate the instrument and provide an

N.I.S.T. certificate if desired.

1. Set the instrument to the Sound Level Measurement Mode (dBA) using the MODE

button.

2. Set the response time to SLOW (see the Programming section)

3. Insert the 407355 microphone into the microphone cavity of the calibrator.

4. Turn the calibrator ON and adjust the CAL screw on the 407355 so that the LCD

display matches the calibrator output signal (94dB typically).

5. Calibration should be performed before each use.

PC Interface

Connecting the meter to the PC via the supplied interface cable

Connect the 5-pin end of the supplied interface cable to the DOSE Meter. Connect the 9-

pin connector end of the cable to the PC COM Port. Cable and adaptor wiring are detailed

later in this manual for reference.

Installing the supplied DOSE WindowsTM Software

1. Insert the supplied software CD in the PC CD-ROM drive.

2. Follow the on-screen instructions for installation of the DOSE software program.

3. Open the DOSE program from the location where it is installed on the PC.

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407355 Version 2.4 9/079

PC Interface Operational Modes

The PC Interface for the Model 407355 is used for both the Sound Level Meter (SLM) and the

Noise Exposures Survey modes of meter operation:

Sound Level Meter (SLM): There are 2 modes, Data Acquisition and Datalogging. In

‘Data Acquisition’ mode, the meter is connected to the PC and used as a Sound Level

Meter. The PC captures the SLM readings (0.2 to 60 sec. sampling time), displays them

in a variety of formats, and saves them to a file. In ‘Datalogging’ mode, the meter is used

to capture up to 8800 readings in its internal memory (0.1 to 6553 sec. sampling time).

The meter is disconnected from the PC while this function is performed. After the

readings are captured, the meter is connected to the PC and the data is transferred from

meter to PC.

Noise Exposure Survey mode: In this mode, the meter is used normally as a Noise

Survey Dosimeter. The meter is disconnected from the PC while the noise survey is

performed. After the survey, the meter is connected to the PC and survey data is

transferred from meter to PC.

Each mode is discussed below:

Sound Level Meter (SLM) Data Acquisition mode

1. Connect the meter to the PC using the supplied interface cable.

2. Run the DOSE software program.

3. Use the meter in the SLM mode as described previously.

4. Use the MAIN SOFTWARE and CONTROL PANEL windows to operate the meter,

view the readings, and save the data file. The MAIN and the CONTROL PANEL

windows are described in the Software Reference section.

Sound Level Meter (SLM) Datalogging mode

1. Perform a Datalogging operation as described previously.

2. After the test, connect the meter to the PC.

3. Run the DOSE software program.

4. Click the MEMORY tab in the MAIN software window. The MEMORY window will open

and the readings will be copied from the meter to the PC.

5. After the data is downloaded, the Recorded Sets will be listed. Click an individual set

and a detailed view of the data will appear.

Note: Datalogging sampling time can be set from 0.1 to 6553 seconds. Click in the Interval

window, enter a time, and press the Return Key to accept the sampling time.

Noise Exposure Survey Data transfer to PC

1. Perform a Noise Survey as described previously.

2. After the test, connect the meter to the PC.

3. Run the DOSE software program.

4. Click the EVENT tab in the MAIN software window. The EVENT window will open as

shown in the Software Reference section.

5. Click on the BANK tab in the EVENT window and select an individual bank (E1, E2,

E3, E4, or E5) or all of the banks (E1-E5). The data will appear in the relevant bank

column in the EVENT window. Alternatively, the user can click on the column of the

Bank in order to download the noise survey results for a particular memory bank (E1

through E5).

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407355 Version 2.4 9/0710

Software Reference Information

The REMOTE CONTROL and MAIN SOFTWARE Windows

When the DOSE program is opened, two windows appear. The CONTROL PANEL

window is used to remotely control the meter and to remotely view the meter’s readings.

Simply click on the meter’s push-buttons in the CONTROL PANEL window. The MAIN

SOFTWARE window has numerous functions and displays as detailed below.

CONTROL PANEL WINDOW

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