Casella-cel CEL-63X Manual do Utilizador descarregar pdf (Página 75)

CEL-63x Environmental & Occupational Noise Meter

75 Casella CEL

10 Additional information

The following additional information relates to testing under IEC 61672-1:2002

section 9.3 of the standard.

1. Reference sound pressure level

The reference sound pressure level can be selected to 94 dB or 114 dB.

2. Reference level range

The CEL-63x instrument has a single measurement range of 0 dB to 140 dB.

3. Microphone reference point

The microphone reference point is the centre of the microphone‟s diaphragm.

The 0° reference direction is perpendicular to the microphone‟s diaphragm.

4. Acoustical frequency response testing

Table 3 shows the pressure to free-field correction data for the CEL-251

microphone used for periodic testing.

Table 3. Pressure to 0° free-field corrections

Frequency

Without wind

screen

With wind

screen

Without wind

screen

With wind

screen

Expanded

uncertainty of

corrections at 95 %

probability (k=2)

Bruel & Kjear 4226

calibrator

Bruel & Kjear UA0033

electrostatic actuator

31.5

-0.1

0.2

-0.2

0.2

125

-0.2

0.2

250

-0.2

0.2

500

-0.2

0.2

1000

0.1

0.2

2000

0.3

0.7

0.3

0.7

0.3

4000

0.7

1.4

0.8

1.5

0.3

8000

2.8

2.5

3.1

2.8

0.4

12500

5.3

4.1

6.2

5.0

0.6

16000

6.4

4.5

7.8

5.9

0.6

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 86 87

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