Casella CEL CEL-278 - Manual (Page 9)

3. DESCRIPTION
3.1 Technical Description
The CEL-278/2 is designed to be mounted close coupled to the bottom of a
CEL sound level meter. It receives signals to be filtered via line 4 of the
connector in the top of the instrument case, and returns them to the Meter for
measurement via line 6 of the same connector.
Figure 1 Block diagram of the CEL-287/2
CEL Instruments Ltd. CEL-278/2 Handbook Page 9