For example: Agilent E4440A or Anritsu 68369
Ametek - Elgar AC Power Supplies
Programmable AC Power Sources, Frequency Converters
Ametek - Elgar SW10500-1-3-2
0-10500VA Single/Triple Phase AC Power Supply system
Manufacturer: Ametek - Elgar
Ametek - Elgar SGA 60X 250C-0AAA
Programmable Precision DC Power Supply
Manufacturer: Ametek - Elgar