Casella CEL CEL-281 User Manual
Page 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.
Note*:
Calibration after a measurement overwrites the initial calibration level used in any
printout via a PC program.
Page 66 - CEL-281 Operator's Handbook
Preparation_