Casella CEL CEL-368 - Manual (Page 45)

Warning !
Polarizing voltage must be OFF to prevent damage
when the MK-250 is used.
The MK-250 1 ⁄
2 " Electret Microphone can be fitted if the CEL-268 is to
be used for long term monitoring or in damp conditions. (See Chapter 3
and Section 5.4.) Proceed as follows.
1. With a condensor microphone fitted (or no microphone fitted),
switch the polarizing voltage OFF as described under "Set Pol."
in Section 6.3.
2. Press to switch the instrument power OFF.
3. Locate the CEL-225/3 Preamplifier supplied into the keyway of
the socket at the tapered end of the instrument before pushing
the preamplifier firmly into place.
4. Screw the MK-250 Microphone on to the preamplifier.
SCREW THE MICROPHONE ONLY FINGER TIGHT.
CEL-368 - Standard Microphone
Proceed as follows.
1. Ensure that the power is OFF.
2. Locate the CEL-230 Microphone and Preamplifier Unit supplied
into the keyway of the socket at the tapered end of the instru-
ment before pushing it firmly into place.
Both Instruments
To avoid reflections from the operator's body, it is suggested that the mi-
crophone be positioned remote from the instrument. This can be
ON
OFF
CEL-268/368 Operator's Handbook - Page 41