For example: Agilent E4440A or Anritsu 68369
Power Supply
Keysight / Agilent 6515A
1600 V, 0.005 AMP, High Voltage DC Power Supply
Manufacturer: Keysight / Agilent
Keysight / Agilent 6516A
3000 V, 0.006 AMP, High Voltage Power Supply
Manufacturer: Keysight / Agilent