Extech Instruments 407355 Manual de instrucciones descargar pdf (Pagina 3)

3 407355 Ver. 1.02 9/99

3. METER DESCRIPTION

1. Microphone

2. LCD Display

3. Power ON/OFF key

4. RUN / Left Arrow key

5. SPL, DOSE, TIME Mode and

Left Arrow key

6. Event / Up Arrow key

7. Real time clock / Right Arrow key

8. Reset key (clears Event data)

9. Calibration screw

10. Battery Cover

11. Belt clip

12. PC interface connector

4. DISPLAY DESCRIPTION

1. %DOSE icon

2. Peak detector (> 140dBA)

icon

3. TIME display icon

4. Sound Level measurement

icon

5. High level warning icon (>

115dBA)

6. Event register E1-E5

7. Battery health icon

8. Fast response time icon

9. Slow response time icon

10. Noise accumulation icon

11. Measurement pause (hold) icon

5. DOSE CONSIDERATIONS

DOSE is a parameter used to quantify noise exposure over a period of time. 100% DOSE is

considered to be a 90 dBA noise level over an 8 hour period (in the US, for example). This

value of DOSE is known as the CRITERION. Other Criteria are used, for example 100%

DOSE = 85dBA for some other countries. To see how this works, use the 90dBA example

above and apply it the following.

1. A person experiencing a noise level of 90dBA would receive a 50% DOSE in 4 hours.

If the noise level was 95dBA (5dB higher), a 100% DOSE would be accumulated in only

4 hours. This is because of what’s known as the Exchange Rate whereby a 5dB

increase (selectable) in noise level corresponds to a doubling of noise energy.

The Criterion Level, Exchange Rate and Threshold level are determined by the

applicable national noise standard. Always check the local regulations before using the

meter.

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INSTRUCTION MANUAL 1
Model 407355 1

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Extech Instruments 407355 Manual de instrucciones Pagina 3

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