Casella-cel CEL-63X Manual do Utilizador descarregar pdf (Página 24)

CEL-63x Environmental & Occupational Noise Meter

24 Casella CEL

4 Detailed description

4.1 Microphone and pre-amplifier

The CEL-63x instrument has a removable ½-inch (12.7 mm) microphone. This

is a pre-polarised microphone that uses a permanently charged material in its

construction.

The instrument is supplied with a windshield. The windshield provides

protection from wind and from minor mechanical damage. The windshield

should always be fitted to the microphone.

There are two classes of microphone available, which have different

sensitivities.

The Class 1 microphone (CEL-251) has 50 mV/Pa sensitivity

The Class 2 microphone (CEL-252) has 30 mV/Pa sensitivity

NOTE

For High range measurements above 140dB a special microphone (-MIC1) and

adaptor (-MPA1) can be used. See page 56.

4.2 User controls

Soft keys

The Soft keys select between the two options showing at the bottom of the

screen. These two options change, depending on which screen is showing on the

instrument‟s display. Therefore, the Soft keys can have different functions,

depending on which screen the instrument is showing.

Usually, you must press the Soft key on the right to select a function, and you

must press the Soft key on the left to exit a screen or cancel a function.

Press the Soft key for the option that you need to select that option.

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