Circuit lets you isolate and measure current

摘要

You often need to measure current during circuit design and debugging. You can perform that task by breaking a path, inserting a shunt resis-rntor, measuring its voltage, and converting the voltage to current. Unfortunately, that approach is sometimes impractical with an oscilloscope because one sidernof an oscilloscope probe connects to ground. Thus, you need to isolate the oscilloscope from the circuit under test.rnThe circuit in Figure 1 produces a voltage proportional to current and isolates the oscilloscope from the measurement point.