Casella CEL CEL-393 User Manual
Page 17
The instrument is not designed for permanent outdoor operation, how-
ever the optional CEL-298/2 Preamplifier and its associated CEL-194/2
Outdoor Enclosure may be connected to the CEL-393 for this type of
measurement. Further details are included in Section 4.6.
CEL-393 is now ready for service, and in line with accepted good
practice, it is recommended that the instrument's calibration be verified
by a competent laboratory annually, and that it is checked at the
beginning and end of each major measurement sequence. The proce-
dure for this is outlined in Chapter 8.
Having connected the microphone and preamplifier and inserted the
battery the instrument may be switched ON. It will default to the battery
check condition for approximately 20 seconds during which time it will
display the on load battery voltage. End of battery life is at 6.5V. (6.8v
on B version) and the battery must be replaced if it shows a lower value.
393 Handbook
/13.