High-impedance voltage measurement, 1950s style. The problem of meter resistance was one for which there were solutions in the age before digital meters. Many decades ago you could buy a valve ...

When electrical issues arise, these quick receptacle power tests will come in handy. Learn how to measure voltage, conduct a ...

Back in the day you could make one fairly easily with a decent panel meter and a set of precision resistors, and now a digital one can ... ADC and its associated voltage reference, and for that ...

For instance, if the customer has an air conditioner and a water heater in a single phase (power connection), irregulated use will surely damage the digital meter as both consume high voltage.