Casella-cel CEL-281 Bedienungsanleitung PDF herunterladen (Seite 75)

6. If the instrument is fully operational but the display has been

switched OFF, press the key to switch the display ON,

then go to step 8.

7. When the instrument is in calibration delay mode, wait for the

20 second delay to elapse so that the instrument can become

fully operational.

8. When the instrument is fully operational with the display

switched ON, press the key to display the battery voltage

in the following format:

9. Replace batteries when the displayed voltage falls near 4.2 V.

Valid measurements and readings can be obtained with battery

voltages as low as 3.0 V. However as the probable battery life

will be very short, it is recommended that a set of new batter-

ies be used whenever the instrument is to be employed for a

complete working shift.

10. If the dosimeter is not to be used immediately, switch it OFF

(ON/OFF switch in outer un-latched position) to conserve bat-

tery life.

4.5 Performing a Field Accuracy Check

(Acoustic Calibration)

In accordance with accepted measurement practice, check the accous-

tic calibration immediately before (and after*) making measurements

with the CEL-281.

Preparation_

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Casella-cel CEL-281 Bedienungsanleitung Seite 75