Keysight technologies u2802a thermocouple box keysight technologies u2802a opt abd the u2802a thermocouple box from keysight technologies amplifies weak input voltage signals from a temperature or a voltage measurement into output voltage signals that can be analysed for data capture the accompanying software enables analysis of the measured values thanks to the easy test set up and the accurate recording of data this device also offers an option to connect up to 31 thermo elements keysight