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Januray18,2002

HearingProtectiveDevice Test Report NumberQ307A Revision

1/9/02

1/10/02-1/17/02

Date of SampleReceipt

Date of SampleTest:

3M OH&ESD.

Attn: Ted Madison

3M Center,Building 260-3B-

SaintPaul MN 55144-1000

Attenuationmeasurementsavebeenperfomled according o the AmericanNational Standards

Institute (ANSI) Specifications,ANSI S3.19-1974, sing he experimenter-fitprotocol, on the

3M corded1270 78-8124-2450-1ev1) (test ll Q307A). The specified hresholdmeasurement

datawere obtainedusing ten nomlal-hearing isteners,six male and our female,with ages

ranging rom 19 o 45 years. These istenerswere selected rom a standbygroup of about35

volunteers,mostly graduate tudents,who regularly serveas isteners or measurementsf this

kind.

The measurements ere made n a room designed or this purpose. All acoustic

characteristics f the room meet he requirements utlined n ANSI S3.19-1974. The ambient

noise evels n this room arebelow the limits specified n ANSI S3.19-1974, nd openear

thresholdsare usedon a continuingbasis o monitor the background oise evels. An automatic

recordingattenuatorwas used o recordboth open and occludedear hresholds.

Eachoften subjectswas ested hree imes at eachof nine test requencies.The attached

Tablesshow grandmeanattenuation alues n decibels dB) for each est signal along with group

attenuation alues. Standard eviations S.D.) for the 30 different attenuation eterminationsor

each est signal are also given. The resultspresentedn this reportpertain o the samples ested

only.

Michael & Associatess accredited y the National Institute of Standards nd

Technology NIST) National LaboratoryAccreditationProgram NVLAP) for testsperfonIled

according o ANSI S3.19-1974 ndANSI S12.6-1984.Theseaccreditation riteria encompass

the requirements fintemational standardsSO 9002:1994 ANSI / ASQC Q92-1987), SO IEC

Guide25:1990,and SO / IEC Guide 58:1993as suppliersof test results. This report may only

be reproduced r transmittedelectronically n it's entirety. This report shall not be used o claim

product endorsement y NVLAP or by any agencyof the U.S. Government.All measurement

equipmentare calibratedwith instrumentationraceable o the NIST.

Use hese aboratory-derivedattenuationdata or comparison urposesonly. Theamountof

protect:on afforded n ield use s often significantly ower depe.flding n how theprotectors are

fitted and worn.

-

Date

Page

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Kevin Michael, Ph.D.

President

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Individual and Summary Attenuation Data for

Hearing Protective Devices

Position: Insert

Date: 1/18/02

Test ID

Test Method: ANSI S3.19-1974

Manufacturer: 3M

Model: 78-8124-2450-1 (rev 1)

0307A

FREQUENCY IN HERTZ

SUBJECT

125

250 500

1000 2000

3150

4000

6300 8000

31

27

35

20

23

23

26

21

21

28

30

31

29

27

24

27

28

26

33

30

32

26

25

29

33

32

35

36

37

39

31

25

34

21

24

22

29

26

25

31

31

30

29

29

29

26

26

26

35

28

33

29

30

31

36

32

41

39

38

39

31

33

36

23

24

24

30

30

33

33

32

28

38

32

38

28

28

31

39

33

34

34

35

37

33

33

41

33

41

38

30

34

32

29

30

31

37

32

30

37

36

30

40

43

36

32

32

33

40

42

35

28

27

31

34

35

37

33

35

34

33

35

37

32

32

31

40

38

33

40

41

32

33

36

35

36

32

33

38

38

37

29

28

28

35

39

36

30

35

33

31

38

31

31

35

34

35

36

34

39

40

34

35

36

38

38

31

34

36

39

36

33

31

35

38

41

30

38

42

41

38

44

37

36

35

36

35

39

35

37

41

35

34

32

30

36

35

36

30

37

32

36

31

37

33

36

33

41

46

45

46

46

43

32

36

37

41

37

36

45

46

43

35

36

34

36

33

37

41

40

35

40

38

43

43

42

50

41

42

44

47

49

47

31

37

35

38

40

40

42

44

43

39

37

47

36

35

38

40

41

40

51

51

52

46

46

47

40

43

47

1

2

3

4

5

6

7

8

9

10

MEANS

STD. DEV.

28.7

5.0

30.1

5.0

32.8

4.6

33.8

4.1

34.5

3.5

35.6

3.4

36.2

4.0

39.9

4.5

42.2

5.3

NRR = 24 dB

Use these laboratory-derived data for comparison purposes only. The amount of

protection afforded in field use is often significantly lower depending on how the

protectors are fitted and worn.

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Date:

Test ID:

1/18/02

Q307A

Manufacturer: 3M

Model: 78-8124-2450-1 (rev 1)

Position: Insert

Measurements were made according to American National Standards Institute

Specifications ANSI S3.19-1974.

Center Frequency Mean Attenuation

in Hz . in dB

Group Attenuation

in dB .

Standard Deviation

in dB

125

250

500

1000

2000

3150

4000

6300

8000

28.7

30.1

32.8

33.8

34.5

35.6

36.2

39.9

42.2

58.9

5.0

5.0

4.6

4.1

3.5

3.4

4.0

4.5

5.3

172.9

82.1

Test Item: Q307A

These data were obtained through measurements made at the laboratories

of Michael & Associates, Inc., State College, PA, USA. Michael & Associates,

Inc., is accredited to test to ANSI S3.19-1974 and ANSI S12.6-1984 by the

National Institute of Standards and Technology (NIST) National Voluntary

Laboratory Accreditation Program (NVLAP).

Date

Page 3 of 3

Kevin L. Michael, Ph.D.

President