I currently have a power supply that will be able to supply around -60 kV DC and 10 mA under the load that I will be hooking up to it. However, the internal resistance of the load will fluctuate and may not be pulling the full 10 mA at all times, thus, a means of monitoring the current flow will be needed. The tricky situation is that I will need to connect the negative power line from the power source directly to a multi meter that will measure the current. Please look to the graph below to reference the design:
The negative side of the power source will provide the -60 kV DC, which must be manageable for the multi meter. Thus, I was curious what I could do to inexpensively allow a multi meter or ammeter to handle such high voltages and such a high power while still being able give an accurate measurement of the current.