Hewlett Packard
HP-6521A
High Voltage Power Supply
0 to 1000 VDC Adjustable
200 mA ( Adjustable current limit)

BNC Output terminals at rear of enclosure
Rack mountable – see photos

Output tested up to the full 1000 Volt rating
includes input power cable

Could use a calibration confirmation

Packaged Weight ~ 25 KG or 55 lb.

Note – only the HP power supply is for sale