Casella CEL CEL-296 - Manual (Page 27)

Figures 6 and 7 show the line connections for the top and bottom
connectors. Interfacing is comprehensively described in Chapter 6.
The analog output conditions are as follows.
1. Conditioned AC signals up to 8.0 V RMS, 11.3 Vpk with a
minimum load impedance of 10 kΩ output via line 6 of the top
connector, and line 4 of the bottom connector.
Consult Lucas CEL about cables for use with equipment not
manufactured by CEL.
3.7 Batteries & Auxiliary Power Supplies
The CEL-296/3 is designed to operate with the set of four
manganese alkaline batteries (Type LR6 (AA)) supplied with the
instrument. Depending on duty cycle, these can give up to 12 hours
of operation.
Warning
Do not attempt to connect any type of charger to the input or
output sockets of the instrument. If rechargeable nickel
cadmium cells are used, remove them from the instrument for
recharging.
Do not use any battery with damaged insulation or sleeving. Do
not mix batteries of different types, or charge condition.
Rechargeable nickel cadmium cells may be employed, but have a
shorter operating period. Zinc carbon batteries are NOT suitable.
The end of useful battery life occurs when the output falls to
approximately 3.2 V. at which the "LOW BAT" message is shown on
the display. If the batteries are not replaced, approximately 30
minutes later an automatic facility switches them OFF. This prevents
them being discharged to a point where they would cause damage if
inadvertently the instrument was still left ON.
CEL Instruments Ltd CEL-296/3 Operator Handbook Page 27