![]() ![]() Measuring the voltage drop across the sense resistor with an active differential probe will provide good results, as long as the common-mode signal is within the probe’s specified operating range and the voltage drop is large enough. If a current sense resistor (“shunt” resistor) is designed into the power supply, this is the most convenient approach. Each of the above two methods has its advantages and disadvantages, which we’ll explore below: Measuring current as a voltage drop across a shunt resistor To make sure your current measurements are as accurate as possible, the most appropriate technique must be selected and applied correctly. Measuring current with a current probe – When used in conjunction with an oscilloscope’s voltage measurements capabilities, current probes can enable a wide variety of important power measurements, such as instantaneous power, average power, and phase. ![]() These are generally low-value resistors, often smaller than 1 Ohm.Ģ. One technique is to measure the differential voltage drop across such a resistor. Measure the voltage dropped across a shunt resistor – some power supply designs may have shunt resistors built into the design for feedback. Most oscilloscopes only directly measure voltage, not current, however, there are a couple of ways it is possible to measure current using a scope:ġ.
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