The most common method for measuring currents in electronic circuits is to place low-value sense resistors in series with the load and measure the voltage drop across them. These voltage drops are very low, so their outputs are applied to precision instrumentation amplifiers with high input impedances. The high impedance minimizes loading on the sense resistor, and the instrumentation amplifiers are engineered to have a very linear transfer characteristic....
Register or Sign in below to download the full article in .PDF format, including high resolution graphics and schematics when applicable.