The Keysight (formerly Agilent) 33502A is a dual-channel, high voltage output amplifier. It has an isolated analog front end with up to 50 Vpp (±25 V) output voltage range. It is also a very low-distortion amplifier with < 0.01% @ 10 kHz and 40 Vpp. The 33502A is designed to work as a companion for function generators to offer low-distortion, higher voltage outputs.
The 33502A is compatible with function generators including the Keysight 33120A, 33220A and 33250A. It can also be used to amplify signals from any output such as the analog output channel on a data acquisition card.