General properties: DMM internal resistance: 10M
DMM max DC voltage rating: 1000V
Desired max measurable voltage with this probe: 20KV
First things first: During construction pay extra attention to proper insulation if you're playing with high voltage. Always discharge caps after use!
Things needed for this instructable:
high voltage resistors from microwave oven caps (I've already had them disassembled for another project) 10M each on ceramic base.
Heatshrink tubing - for insulation
Applicable tube (Xtra big sharpie housing or other blackboard marker) - for the probe body
Double insulated HV wiring
Copper rod - for the tip
Crocodile clip + banana plugs - for connectivity
Some power and handtools for the operation.
First you need to go get some microwave oven capacitors. Be careful with them they are rated at 2100VAC!!! That's lethal if you get shocked. I generally use snippers to cut the upper edge off, then i pour out the mineral oil and remove the resisor. You can put the whole thing back together seal it up with some goop refill the oil, and you have a nice HV DC cap. That way is really cost efficient 'cuz you end up with two useable parts for one move.
For the body I chose to use a old dried out fat ass mega sharpie. I pulled out all the guts and discarded them. Then I made a copper insert to the front to secure the measuring needle (tip) in the nose section (tight tolerances!). It's removable if service is needed.