Casella CEL CEL-368 - Manual (Page 7)

CEL-268 - Type 1
Insert the CEL-225/3 Preamplifier supplied into the socket at the tapered
end of the instrument, locating the unit in the keyway before pushing it
home.
Then carefully screw the CEL-192 Microphone supplied on to the pream-
plifier. SCREW IT ONLY FINGER TIGHT.
CEL-368 - Type 2
Insert the CEL-230 Microphone and Preamplifier Unit supplied into the
socket at the tapered end of the instrument, locating the unit in the key-
way before pushing it home.
1.2 Loading Batteries
The instrument is powered by
four standard AA size batteries.
The batteries are located in a
compartment reached by sliding
open a cover near the bottom of
the right hand side of the instru-
ment case. Remove the sliding
cover carefully as it has four
spring contacts on it. Correct po-
larity will be achieved when bat-
teries are inserted in the
orientations shown.
1.3 Switching ON/OFF
Switch the instrument ON and OFF by pressing .
Immediately it is switched ON, the noise meter performs a self-test se-
quence during which it shows the software version number and briefly
ON
OFF
890026
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CEL-268/368 Operator's Handbook - Page 3