Safety
-Electrical Safety-discharge capacitor with a 10-ohm resistor rated at 1W or 2W, confirm with multimeter measuring the voltage.
Tools
-->Oscilloscope... for example samples at 1 gigasamples per second, with a bandwidth of 100 MHz. thus, one cycle of the fastest waveform it can display will be broken into ten samples, which is pretty good. at a minimum, the sample rate should be four times the bandwidth