General settings
The Otii hardware can be set up with the following configurations in the General Settings section:
Please note that there are some differences in settings between the Otii Arc Pro and Otii Ace Pro.
Supply mode
Power Box: The Otii hardware will supply a constant voltage to the Device Under Test (DUT).
Battery emulator: Otii hardware will emulate a battery. (Only available with Battery Toolbox)
In-line: This particular mode is exclusive to the Otii Ace Pro version. It works like an ampere meter by being in-line between the power source and the DUT. The Otii Ace Pro automatically switches between different measurement ranges but provides no power. To also measure voltage, 4-wire must be enabled.
Over current protection
The OC current protection setting allows users to set a maximum current limit that the Otii hardware can supply. For the Otii Arc, if the current exceeds the assigned limit, the unit will switch OFF the main supply to protect the DUT.
Within the dropdown, choose among the available options how the current limits must be detected, along with expected device behavior:
Limit: enabled for Otii Arc Pro and Otii Ace Pro, it limits the output current to the set current, lowering the output voltage.
Cut-off: enabled only for the Otii Arc Pro, it detects when the current exceeds the set current to turn the power OFF and open the output relay.
Digital voltage
The digital voltage setting allows the output voltage desired for the pins available within the expansion port to be set up. Also, depending on the digital voltage setting, the level for deciding if it is a logical 0 or 1 is also changed.
Some configurations in this section differ based on the version of Otii hardware used.
Otii Arc Pro
GPO1 & GPO2 - enable digital outputs
5V - enables an additional fixed 5V output
4-wire - enables 4-wire measurements to compensate for voltage drop in the power supply leads.
Otii Ace Pro
0-15V - Enables an additional voltage output ranging from 0 to 15V.
GPO1 & GPO2 - enable digital outputs
4-wire - enables 4-wire measurements to compensate for voltage drop in the power supply leads.
Main current
The main current enables the Otii hardware to switch automatically between the different measurement intervals.
Auto range: when selected, the highest available measurement accuracy interval is selected.
High range: when selected, it prevents the Otii hardware from going to the lowest measurement range. Therefore, there is no switch in or out of the shunt resistor.
Use this setting if the device resets when the Otii hardware switches measurement interval.
Use this setting if higher voltage output is needed for Otii Arc Pro, as the voltage drop internally within this Otii hardware version is lower.
Otii Arc cannot supply above 3.75V in USB mode and 4.55V when supplied with DC plug when selecting auto range. In high range, it can supply 4.2V in USB mode and 5.0V when supplied with DC plug. Note, Otii Ace can supply the full voltage range both in USB mode and when supplied with DC plug.
ADC resistor
When using the ADC pins to measure the current of a specific system, an external shunt resistor is required. Therefore, the resistance must be set. To ensure that the resistor impedance is set correctly, refer to the "Measuring a subsystem" example; this example will guide you through connecting the DUT to the ADC connectors and setting the impedance of the resistor.
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