Tektronix - Fundamentals of Floating Measurements and Isolated Input Oscilloscopes

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This guide will provide you with a fundamental glossary of power measurement terms, explain the different options available for making floating measurements, and highlight the advantages and trade-offs of each option.


The most demanding floating measurement requirements are found in power control circuits, such as motor controllers, uninterruptible power supplies, and industrial equipment. In such application areas, voltages and currents may be large enough to present a hazard to users and/or test equipment. When measuring floating high voltage signals there are many options to consider. Each option has its advantages and trade-offs.


Differential vs. Floating Measurements


All voltage measurements are differential measurements. A differential measurement is defined as the voltage difference between two points. Voltage measurements fall into two sub-categories:


1. ground-referenced measurements
2. non-ground-referenced measurements (also known as floating measurements)...


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