Measure VBAT, VBUS, and VOUT using an oscilloscope

Measure the current with an oscilloscope by probing the voltage drop across a current-measurement resistor.

Measurement steps:

1. Connect an oscilloscope in differential mode (or a similar mode) with two probes across the probe points of interest, depending on the measurement case prepared initially.
   The following figure shows the VBAT current-measurement case, with probe points across the IBAT resistor between pins 1 and 2 on P1.

   
2. Plot the voltage drop measured across the probe points and calculate the current. The measured voltage drop across the resistor is proportional to the current, depending on the resistance. For instance, a 100 mΩ resistor causes a 0.1 mV drop for each 1 mA drawn by the current being measured.
   The current can be averaged or integrated to analyze current and energy consumption over a period. A minimum of one sample every 5 µs is needed to accurately measure the average current.