Casella CEL CEL-450 - Manual (Page 10)

1.3 Install Microphone, Preamplifier
& Batteries
Screw the Class 1 microphone “finger tight” on to the preamplifier. With
the instrument switched OFF, insert the connector of the preamplifier
plus Class 1 microphone or Class 2 microphone / preamplifier unit into
the socket in the cone at the top of the instrument case. Face the red
dot on the preamplifier to the front of the instrument so that the key
engages in a keyway in the socket to ensure correct pin connection.
(To disconnect the
preamplifier unit from the
instrument, pull on the
knurled sleeve.)
Load four new 1.5 V
batteries (AA or equivalent)
into the battery compart-
ment in the rear of the
instrument (Figure 3).
Make sure they are
inserted in the orientations
shown inside the
compartment.
One cell installed with wrong polarity may still
allow the instrument to function, but can
cause overheating severe enough to rupture a
cell and damage the instrument.
1.4 Switch Instrument ON/OFF
1. Press to switch the instrument ON.
The instrument starts a series of self tests, during which it
indicates the instrument type, firmware version, preamplifier
type and interface status.
Figure 3: Battery orientation
Introduction
Page 10 - CEL-450/490 Operators Handbook