Best Voltage Regulators

Beleeb 20 Amp Variable Voltage Regulator Transformer, 2000VAC Max,120VAC Input, 0-120V/130VAC Output If you have an unlimited budget or are running an official lab, please buy a dedicated lab-grade variac or regulated high-voltage power supply. If you're using this at home for hobbyist use, I definitely recommend! Variac Variable Transformer to power equipment for testing with on oscilloscope. Without isolation, oscilloscope probing can be dangerous, as the BNC connector sheaths are shorted to mains earth. What this means is that if your testing equipment is referenced to mains earth and you accidentally connect your ground probe to something other than mains earth, you have a short with the potential for massive current through your scope. With isolation, the secondary side of the transformer floats, so long as the product does not include an internal mains earth connection to one of the sides of the secondary. A floating secondary can go a long way to protecting your equipment, since touching ONE probe to either side of the secondary will not cause a short, but rather just unfloat the secondary so that the potential of the probe in contact is now defined as ground,One point of contact is OK with an isolated system, but once you define the ground, any other place you touch on the secondary will cause a short through the two points in contact.