B&K 2250 Light Manual do Utilizador descarregar pdf (Página 68)

Hand-held Analyzer Types 2250 and 2270 – User Manual

Fig.5.5

Details in the

Transducer Database

All the details for the currently selected microphone can be found in the database. You can add

other transducers by tapping on the Add New Transducer icon , selecting Microphone,

Accelerometer or Direct input from the drop-down, and filling in the details of your particular

transducer parameters. See section C.2.1. This is done by selecting the item from the drop-

down list that appears on some parameter fields, or by entering the data via the keyboard that

appears on other parameter fields.

When adding a new microphone, Type 4189 is the default entry. Change Microphone Type to fit

your microphone. For known microphone types, a number of parameters are automatically set.

Note 1: If the transducer is a microphone and the microphone type is known to the analyzer (as

in the example in Fig.5.5, where Type 4189 details are known), then the parameters Nominal

Sensitivity, Polarization Voltage, Free-field, Capacitance and CCLD are set automatically. See

details in Appendix C. The analyzer can then make sound field correction and windscreen

correction as specified in the setup. To confirm which type of correction is being applied, an

icon is displayed in the measurement Status Field, as described on section 4.4.2. If the

microphone is unknown to the analyzer, no corrections can be made and no icon appears in the

Status Field. The parameters mentioned above have to be set manually (that is, typed in). We

recommend that you insert the value for Nominal Sensitivity directly from the calibration chart.

Nominal sensitivity is used in the automatic level detection calculations, when calibrating using

Sound Calibrator Type 4231, to determine whether the level is 94 or 114 dB.

Note 2: If the transducer is an accelerometer and the accelerometer type is known to the

analyzer, then the parameters Nominal Sensitivity, CCLD and Weight are set automatically.

In the top line of the Status Field you can select which transducer is currently connected to the

analyzer. This can also be done via the Setup screen by selecting Input, then selecting the

transducer in the Transducer field.

In the first line of the Status Field you can select whether the transducer is connected to the Top

Socket or the Rear Socket of the analyzer. This can also be done via the Setup screen by

selecting Input, then selecting the socket in the Input: field.

For Type 2270 only: In the second line you also have a Channel Selector.

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B&K 2250 Light Manual do Utilizador Página 68