The AIAcompact is a portable unit for in-service acoustic and electric (UHF) partial discharge measurements on gas insulated switchgear (GIS), transformers and cable accessories. The instrument is fitted with a battery pack for independent operation up to 3 hours. It adapts to a variety of piezo-electric acoustic sensors and is supplied with a versatile sensor fixture. Additionally, the AIAcompact allows partial discharge measurements on external UHF sensors.