Silego: Voltmeter and Ammeter Autorange Control

January 25, 2017 // By Silego
This application note describes how to design a circuit to control automatic ranging of a volt/current meter. This article focuses on two auto-ranging examples: low-side current sensing using an array of shunt resistors, and dynamically attenuating a voltage input to a simple voltmeter. However, other configurations are possible, such as varying the gain of a digitally-controlled instrumentation amplifier such as the AD8250.
autoranging, voltmeter, ammeter