Multimeters are a necessary tool for developing electronic devices. In this article, we will explore the challenges of using a multimeter to estimate the energy consumption of an example device: a microcontroller-based wireless sensor.
Current measurement is performed using an “ammeter”, which is included in most multimeters. The most common ammeter implementation places a current shunt resistor in series with the load:
The ammeter works by measuring the voltage across the resistor.