Simple set-up for battery profiling
Three things are needed: Otii box, a battery of your choice, and a connection between the battery and Otii box (e.g. battery holder or spot welded cables)
What battery can be profiled and emulated?
Otii Arc can sink currents up to 2.5 A and source currents up to 5 A. Monitor load currents from 50nA to 5 A with high accuracy up to 0.1%.
Otii Ace Pro can sink currents up to 5 A and source currents up to 5 A. Monitor load currents from 25nA to 5A with high accuracy up to 0.05%,
Model sleep & active modes for profiling
Create discharge profiles of the batteries with specific conditions for the discharge that reflect how your application is behaving. There are two levels of discharge: low and high discharge for sleep and active mode respectively.
Since the conditions are set by how your application is intended to run, the profiling gives you a more realistic battery performance.
Three options for battery discharge
Discharge the battery with a constant current. The current will not change as the battery voltage drops. This is similar to as if there were a linear regulator as load.
Discharge the battery with constant power. Voltage is measured and discharge current is calculated to get set power. The discharge current will increase as the battery voltage drops during the profiling.
Discharge the battery by simulating a resistance connected to the battery. The discharge current will decrease as the battery voltage drops during the profiling.
Fixed and follow discharge options for the emulation
Select Fixed emulation to simulate the battery with a constant “Used capacity”. Pick a spot on the discharge curve and remain in this position, emulating the battery at this specific position (position = how much used capacity is drawn from the battery).
The Follow option will simulate a discharge over the time you are recording. Choose this option if you want the tool to emulate the battery and change behavior as the energy is consumed from the battery. Position in the discharge curve will then move as your device consumes energy.
Parallel and series battery set-ups
Emulate set-ups with battery cells in parallel and/or series – up to 4 batteries for parallel set-up and flexible number for series set-up depending on the Open Circuit Voltage (OCV). Note the max OCV of 5V for Otii Arc and 25V for Otii Ace Pro.
Multi set-up
Connect as many units as there are batteries that are going to be discharged. More than two Otii boxes are easily connected with a powered USB hub. All connected batteries will be discharged with the same chosen profile.
4-wire set-up (COMING SOON)
Compensate for the cable resistance when discharging batteries with high current or if battery cables are very thin. Connect Sense+ to the battery positive pole and Sense- to the battery negative pole, and Otii box will then compensate for the voltage drop in the cables by using 4 terminal sensing.
