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3M Occupational Health & Environmental Safety Division

3MTM Sound Detector SD-200 Training Module


Overview….

What is a 3MTM Sound Detector SD-200 ? When and Why will I use the Sound Detector SD-200 ?

The Basics of Sound

H i th S d D t t SD 200 t d? How is the Sound Detector SD-200 operated? Measurements and Specifications Where can I find out more?Where can I find out more?


What is the 3MTM Sound Detector SD-200?

Compact, lightweight sound level meter designed for measurement of workplace and p , g g g parea noise levels.

Offers an integration feature that computes the average sound pressure level. Simple user friendly interface Simple, user-friendly interface. User selectable LED Alert screen provides visual reference of sound levels with

green, yellow and/or red LEDs. Rechargeable battery, with up to 50 hours between charges


3MTM Sound Detector SD-200 ComponentsDisplay and Keys:1. LEDs (used in LED Alert Screen)

Microphone

2. Screen indicators: fast response/A-weighting3. Measurement type

SPL, LEQ

/LAVG

, LED Alert , MAX, MIN, Run-Time )N N i di i ifi SPL

1

Note: No indicator signifies SPL

4. Measurement value 5. F/S (Fast/Slow time response key)

23

4

6. Mode key (cycles through measurement screens)

7. Run/Stop key for averaging values56

7

9

8. Power On/Off Key9. A/C Frequency weighting key

8


The Product Features User-selectable LED Alert screen provides quick, visual reference

when preset noise levels have been reached Quick and easy

The Product Features

when preset noise levels have been reached. Quick and easy visual queue especially for users setting up unit on tripod.


When and Why will I use the SD-200 ?A ti d h i b iAnytime and anywhere noise may be an issueWhat are the issues?

Causes Stress Distraction – taking attention away from detail. Interferes with communication Can cause permanent damage to your hearing and Can cause permanent damage to your hearing and

health


Possible Sound Detector SD-200 Applications

Occupational noise measurements:p Hearing conservation compliance Noise control planning Noise control maintenance Noise control maintenance

Community and traffic noise complaintevaluations

3M Occupational Health & Environmental Safety DivisionBasics – Definition of a Sound

Here is a diagram representing a string Here is a diagram representing a string attached at points A and B. At position (1), the string is in its normal resting position. When the string is stretched to position (2)

d l d l ti it i hi h d it ill t t and released, elasticity is high and it will start to return to its resting position (1). As it reaches (1), inertia (tendency to continue in a fixed direction) is high and it will continue ) gtraveling through (1) to (3).


Basics – Definition of a Sound

When the string has traveled from (1) to (2) to (1) to (3) and back to (1), one complete cycle has occurred This graph shows has occurred. This graph shows this cycle as a function of time; the curve drawn is referred to as a sine wave.


Basics – Definition of a Sound

When sound travels in air, it creates lt ti iti d ti alternating positive and negative

pressures (compressions and rarefactions) of the air molecules. This graph shows how air molecules g pare compressed and rarefied as a function of the sound pressure. It is these changes in pressure that are measured by a sound level meter measured by a sound level meter (SLM). While many aspects of a sound can be measured and analyzed, two are most commonly considered… how many cycles are completed in a period of time, and how much pressure is created.

3M Occupational Health & Environmental Safety DivisionBasics – Sound MetricsFrequencyFrequency

When a sound is transmitted in air, the air molecules will be compressed and rarefied. The rate of this movement can vary, and the number of times per second a cycle pattern repeats itself defines a sound’s frequency or cycles per a sound s frequency or cycles per second (CPS). When a tuning fork is vibrating it will produce a sound by resonating in a repetitive pattern. The unit of measurement pfor frequency is hertz (abbreviated Hz). This drawing depicts two sine waves on the same graph. The time duration for both signals shown is 1 second One sine shown is 1 second. One sine wave completes one cycle within that second and the other completes 10 cycles. The frequency of each sine wave is 1 q yand 10Hz respectively.

3M Occupational Health & Environmental Safety DivisionBasics – Sound MetricsFrequency WeightingFrequency Weighting

When the noise exposure for hearing conservation is to be hearing conservation is to be measured, the instrument used typically must have a built in frequency filtering network so that measured levels relate to the risk f d t h i Thi for damage to hearing. This filtering network is characterized by reduced sensitivity at frequencies below 500 Hz and above 4000 Hz see curve “A” This above 4000 Hz, see curve A . This filter is called an “A” filter (or “A” weighting). The “C” curve which is also shown is more linear. “C” weighting is often used to assess machinery or community noise, and may also be used in the evaluation of hearing protectors.

3M Occupational Health & Environmental Safety DivisionBasics – Sound MetricsSPL Intensity (decibels)SPL Intensity (decibels)

The intensity of sound is measured in decibels, or tenths of a Bel, Sound Pressure Level (dB SPL) The decibel Pressure Level (dB SPL). The decibel scale is a logarithmic function. One reason for using a logarithmic scale to measure sound is because the ratio between the threshold of hearing and gthreshold of pain in the human ear if measured in true energy is 100,000,000,000,000 times. The same range using the decibel scale is 0 - 140 dB In noise measurement decibels are dB. In noise measurement decibels are referenced to 20 micro Newton/m2. When sound is measured using “A” or “C” weighting the level is noted as in dBA or dBC. This drawing shows two sine waves dBC. This drawing shows two sine waves with the same frequency, but different intensities.

3M Occupational Health & Environmental Safety DivisionTypical Noise Levels

140 Super Siren. Jet airplane takeoff at 50 feet

130 Approximate threshold of pain in the human ear.

120 Jet Airplane takeoff at 200 feet.

110 Riveting machine. Chain Saw

100 Area around electric furnace

90 Boiler room. OSHA permissible exposure level (PEL)

80 Pneumatic drill at 50 feet

70 Speech at 1 foot

60 Background in large retail store. Speech at 3 feet.

50 Private business office. Typical Home.yp

40 Quiet residential area

20 Background in motion picture studio

0 Average threshold of hearing, 1-4kHz


Noise Measurement In The WorkplaceSound levels and distanceSound levels and distance

Sound pressure levels decay over distance To measure sound as it is effecting workers,

measure at the ear not the sourcemeasure at the ear not the source


Settingsg

Typical sound level measurement settings: A-Frequency Weighting Slow Time Response 3 dB Exchange Rate (factory default settings.)

Ch i A/C i hti Sl /F t Changing A/C weighting or Slow/Fast response Press corresponding keys (when not in run mode)

Changing Exchange Rate3 dB (f L l ) 5 dB (f L l ) 3 dB (for LEQ values) or 5 dB (for LAVG values)

(1)Press key and key when in powered off mode. (2)Press key to change setting. ( ) y g g (3) Press key to accept value or key cancel.


Running and stoppingg pp g

ABOUT: used to start and stop the Run-Time for integrating meas rements s ch asfor integrating measurements such as: LEQ/LAVG LED Alert , MAX, and MIN values

1 P k hil d1. Press key while powered on. The icon appears.

2 To stop press key The icon

Press to run

2. To stop, press key. The icon disappears.

or stop

On/Off key


LED Alert Screen and LED levels explained

The LED alert screen displays LEQ/LAVG measurements, a detection icon and activated LED indicator levels Thisdetection icon , and activated LED indicator levels. This measurement screen provides an alternative view to the standard average level display.

LED

Detection icon

LED


How to run Simple Sound Detector SD-200 survey

1 Power the meter and make sure the battery indicator 1. Power the meter and make sure the battery indicator is not flashing. If it is battery should be charged.

2. Select your weighting (A or C) and response (S or F).3. Hold the SD-200 at a 70 degree angle to the sound

source.4. For SPL, press until value is shown with no 4. For SPL, press until value is shown with no

description. Read value from display.5. For averages and additional measurements, press

to begin the averaging functionto begin the averaging function.6. Press again to stop.7. Press to review your measurements.


Sound Level Measurements


Measurements Displayed

1. SPL (no screen indicator) A-weighted Slow Sound Pressure Level

1 2

2. Leq/Lavg Average SPL the instrument measures over the run-time3. LED Alert screen Average SPL with activated LEDs and Detection

indicator.4. Max (MAX)

3 4

Maximum SPL the instrument measured during test5. Min (MIN) Minimum SPL the instrument measured during test 5 6 6. Run-Time Indicates the time elapsed from the start of the run mode

which is used to calculate the LEQ/LAVG, LED Alert , MAX and MIN valuesMAX, and MIN values


Charging

The SD-200 is charged with the supplied mini USB cable pl gged into the bottom of mini-USB cable plugged into the bottom of the instrument and connected to a computer.

Approximate charge time will vary (2.5 to 12 hours)hours)

Charging status’ (On/Off modes)Battery icon and charging status

The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again.

When SD-200 is turned on and connected to charge, the battery icon will flash. When fully charged, it will no longer flash.

Charging indicator

When turned off, dashes will appear with the charge icon flashing.


Calibrating

When?Calibrator

Performed before taking measurements to ensure that the values measured prior to instrument shutdown will be Calibrator (QC-10)

adapter

instrument shutdown will be accurate. An optional calibrator and calibrator adapter are used for this

Calibration screen

procedure.


Product FeaturesProduct Features

Integration feature computes the average sound pressure level value in LEQ or LAVG, allowing for more accurate measurement of intermittent sound levels for more accurate measurement of intermittent sound levels.


Product FeaturesProduct Features

Rechargeable battery with up to 50 hours between charges. Helps lower total cost of ownership compared to sound level meters which use replaceable batteries.

Product meets applicable sound level meter standards necessary for many applications.


Troubleshooting

Self help: Resetting In the event your SD-200 locks up for an unknown

reason, the SD-200 is equipped with a reset feature. To reset the instrument, press and hold key for at least 20 seconds and then release the key. The instrument will power back on.


For more information

Product User Manual Sales Sheet Quick Start Guide Quick Start Guide www.3M.com/SoundDetector

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