Casella CEL CEL-296 - Manual (Page 33)

Figure 10: Connection for instruments equipped
with the CEL interface
Then gently rotate the locking screw to draw the two
Instruments together, ensuring that they retain their
parallel alignment.
DO NOT OVERTIGHTEN.
5. Insert batteries into the filter set and sound level meter
following the instructions given in Chapter 4 and the
relevant sound level meter handbook.
Warning
Remove batteries from both filter set and sound level meter
if they are to be powered by an external supply.
Alternatively connect both instruments for external power using
the CEL-373212 Power Supply and C4461/2 Cable as
shown in Figure 10.
6.
Set the MODE switch on the filter set to "Man/Ext".
CEL Instruments Ltd CEL-296/3 Operator Handbook Page 33