I am building a mid-size Tesla coil. I want to study the frequencies produced and map the EM field potentials produced by my coil. Considering the high voltages and frequencies involved, typical RF measuring gear will not work. Does anyone have suggestions or links to help me build the device I need to do my experments?
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For voltage, use a bunch of NE2 neon bulbs wired in series on a long wood stick. Each lamp lit stands for about 100 volts. For frequency, the coil probably operates at or below the broadcast band. If you can't hear it on a standard AM radio, buy or borrow a set with the long-wave band. None of this is lab-quality but I assume you want cheap and easy.