Casella-cel CEL-281 Manual de usuario descargar pdf (Pagina 12)

4. If an incorrect time weighting for the required measurements is

indicated at "TC=?", go to Section 1.3.3: Set Time Weighting.

5. If an incorrect frequency weighting for the required measure-

ments is indicated at "dB?", go to Section 1.3.4: Set Frequency

Weighting.

6. When the indicated time and frequency weightings are satis-

factory, press the key.

The CEL-281 starts to collect data at the next whole clock

minute.

1.3.2 Acoustic Calibration

Check the acoustic calibration immediately before making measure-

ments with the CEL-281. (Note that calibration AFTER measurement

overwrites the initial calibration level used in any printout via a PC pro-

gram.

Use a CEL-282 Acoustic Calibrator (Class 2) or a CEL-284/2 Calibrator

(Class 1); both provide a nominal 114.0 dB at 1 kHz.

1. Push the microphone firmly into the cavity of CEL-6050 Coupler

supplied.

2. Push the coupler and microphone firmly into the calibrator cavity.

3. Use the 1.5 mm Allen K ey to retract the locking screw and free

the lower sliding cover.

4. Switch the CEL-281 ON.

CAL is displayed and blinks for 20 s. If calibration is not initiated

within this period, the CEL- 281 becomes fully operational us-

ing the settings stored from last time of operation.

Getting Started_

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Casella-cel CEL-281 Manual de usuario Pagina 12