This Agilent HP 6652A 20Vdc 25Amp 500Watt power supply is fully tested including GPIB and is guaranteed to operate as it was intended. It has a special option making the output local sense inactive. The local remote switch has been removed and the unit is hardwired internally for remote sense. If you want local sense you can wire the sense connections the the appropriate positive or negative output terminal as seen in the photos. if you want remote then you would need to hook the sense leads to the input of the load at the appropriate terminals.