The CED 4302 is a single channel signal offsetter. It adds or subtracts an accurate 5V offset to an analogue input up to ±50 V. It is designed for recording unipolar (0 V to 10 V or -10v to 0 V) signals using a ±5 V recording system, or for driving equipment that has a unipolar input from bipolar (±5 V) output devices. The unit is battery-operated, with an estimated battery life of over 1000 h. When switched off, the inputs and outputs are connected together to provide zero offset.