Impulse generators, known colloquially as ‘thumpers,’ send out brief, high-current or high-voltage surges to transmission lines and cable networks. High-voltage impulse generators are used to verify integrity of high voltage systems where power transmission is taking place. A thumper has the ability for multiple tests including high voltage insulation testing, or hipot testing. Additionally, a thumper has the ability to send an impulse down a cable, allowing a fault to be detected with either a TDR (time domain reflectometer) or a cable fault detector/pinpointer. Other tests these impulse generators can perform are proof/burn testing and arc reflection to assist in pinpointing the location of a fault.