Otii
Arc

Otii Arc

Gain full insight into what drains the battery throughout the product development cycle. Foresee pitfalls and avoid firefighting.

Otii Arc, power analyzer and power supply, comes with the featured-packed free standard Otii software.

Made for hardware, firmware and software developers.

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Features
Tech Spec
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Features
Tech Spec
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Features

Features

Power supply and analyzer

Otii Arc is truly versatile. It is a 2 quadrant source measure unit (SMU) with a constant voltage or constant current source and sink together with a high precision multichannel multimeter.

Set it up as a constant, linear power supply. Use it as a power analyzer or profiler to record and display real-time currents, voltages and/or UART logs. It provides nA resolution current measurements with a sample rate up to 4 ksps.

For every developer’s desktop

Powerful and easy-to-use desktop application for Ubuntu, Windows & macOS. Collect and analyze data from Otii Arc and export the data to popular formats. 

For every developer’s desktop

Powerful and easy-to-use desktop application for Ubuntu, Windows & macOS. Collect and analyze data from Otii Arc and export the data to popular formats.

Quick configuration

From unpacking Otii Arc to measurement in less than 1 minute. Download Otii app, connect Otii Arc via USB to your computer, start the app and you are ready to start your next measurement project.

Power it by USB for portability, or by using an external DC-adapter.

Compact, robust and portable

Otii Arc measures 10,9cm x 14,4cm x 4,4cm (WxLxH) and weighs 450 grams. It is designed for the office, the lab, and usage at home, as well as field measurements. Also, the innovative mechanical design allows for efficient heat dissipation, hence no fan needed and therefore no noise. 

Compact, robust and portable

Otii Arc measures 10,9cm x 14,4cm x 4,4cm (WxLxH) and weighs 450 grams. It is designed for the office, the lab, and usage at home, as well as field measurements. Also, the innovative mechanical design allows for efficient heat dissipation, hence no fan needed and therefore no noise. 

Wide dynamic range

Measure accurately over 8 orders of magnitude from 5 amps down to tens of nanoamps with the wide dynamic range of Otii Arc. Display and work with accurate visualization of the active and sleep modes in one and the same screen and project.

Real-time data display and statistics

Check the statistics of the accumulated energy consumption continuously while recording. You can also select a part of the recording – while recording, or afterwards – to see the statistics for the selected part.

Real-time data display and statistics

Check the statistics of the accumulated energy consumption continuously while recording. You can also select a part of the recording – while recording, or afterwards – to see the statistics for the selected part.

Battery Life Estimator

Perform quick battery life estimations taking into account both active and idle consumption of your device. The consumption can either be entered directly, or imported from a measurement performed with Otii Arc.

Synchronize debug logs

Connect your device UART to Otii Arc’s expansion port RX/TX (TX from your device to RX on Otii Arc and vice versa). The UART logs recorded are synced to the current and voltage graphs making it easy to correlate power consumption to the application state.

Synchronize debug logs

Connect your device UART to Otii Arc’s expansion port RX/TX (TX from your device to RX on Otii Arc and vice versa). The UART logs recorded are synced to the current and voltage graphs making it easy to correlate power consumption to the application state.

Compare recordings

To see the impact of the software and/or hardware improvements that you have done to your device during development, as for example part of regression testing, you can add new recordings to previously saved Otii projects to easily compare the energy consumption profiles.

Crop and Downsample

Crop your data using the selection tool. All data, in all measurements and channels, outside the selection will be deleted. Easily choose what recording(s) the downsample should be performed on, and the downsample ratio. The downsample function makes an average of the sample values and removes the samples in-between.

Crop and Downsample

Crop your data using the selection tool. All data, in all measurements and channels, outside the selection will be deleted. Easily choose what recording(s) the downsample should be performed on, and the downsample ratio. The downsample function makes an average of the sample values and removes the samples in-between.

Measure a sub system

Supply and measure a device and at the same time measure voltage and current consumption for a subsystem of the device, by means of the ADC pins in the Otii Arc expansion port.

Meters

Monitor the input and output status of the Otii Arc.

MAIN V: The voltage at the main outlet; MAIN I: The measured current from the main outlet; VBUS: Measured VBUS voltage in the Otii Arc; VDC: DC barrel plug voltage; SENSE+: Voltage on SENSE+ pin; SENSE-: Voltage on SENSE- pin; TEMP: Otii Arc internal temperature.

Meters

Monitor the input and output status of the Otii Arc.

MAIN V: The voltage at the main outlet; MAIN I: The measured current from the main outlet; VBUS: Measured VBUS voltage in the Otii Arc; VDC: DC barrel plug voltage; SENSE+: Voltage on SENSE+ pin; SENSE-: Voltage on SENSE- pin; TEMP: Otii Arc internal temperature.

Sense pins

Use Sense pins in the Otii Arc expansion port to monitor the voltage rails of your device (for example 1.8 V and 3.3 V rails). Use them also for a four-wire measurement, which compensates for voltage drop in your cables. Note, four-wire measurement only available with Battery Toolbox (during profiling) or with Automation toolbox (during scripting).

GPI/O

There are two GPIs (General Purpose Input) and two GPOs (General Purpose Output). With the GPIs it is possible to see the logical state for two signals. The GPI and GPO voltage is in relation to the DGND pin on the expansion port.

GPI/O

There are two GPIs (General Purpose Input) and two GPOs (General Purpose Output). With the GPIs it is possible to see the logical state for two signals. The GPI and GPO voltage is in relation to the DGND pin on the expansion port.

Multiple Otiis

Measure with multiple Otii Arcs. Connect several Otii Arcs to the same computer, control and measure individually.

Share and collaborate

Share Otii files with your customers, colleagues and suppliers. Download Otii application for free and use it to open the Otii files, and view the measurement and work with them (crop, mark, move, read stats). Add new measurements in the same project by connecting Otii Arc and your set-up.

Share and collaborate

Share Otii files with your customers, colleagues and suppliers. Download Otii application for free and use it to open the Otii files, and view the measurement and work with them (crop, mark, move, read stats). Add new measurements in the same project by connecting Otii Arc and your set-up.

Tech Spec

Tech Spec

Min Unit Max
Operating Environment
Operating environment 15 °C / 60 °F 25 °C / 77 °F
 
USB Power Supply(1)
Output voltage (auto range) 0.5 V 3.75 V
Output voltage (locked to high current range) 0.5 V 4.2 V
Output voltage setting resolution 1 mV
Output current 250 mA
 
External 7.5 – 9 V Power Supply(2)
Output voltage (auto range) 0.5 V 4.55 V
Output voltage (locked to high current range) 0.5 V 5.0 V
Output voltage setting resolution 1 mV
Output current, max continuous(3) 2.5 A
Output current, max peak(3) 5 A
 
Programmable Current Sink (requires an Otii Battery Toolbox license)
Sink current 0 A 2.5 A
Sink current, resolution 39 µA
Sink voltage, USB power supply 0.85 V(4) 4.2 V
Sink voltage, external power supply 0.85 V(4) 5.0 V
 
Current measurement
Accuracy ±(0.1% + 50 nA)(5)
Sample Rate in ±19 mA range 4 ksps
Sample Rate in ±2.7 A range 1 ksps
Sample Rate in ±5.0 A range 1 ksps
Analog bandwidth (3 dB) 400 Hz
 
Voltage measurement
Total accuracy ±(0.1% + 1.5 mV)
Sample Rate 1 ksps
 
UART
Bitrate 110 bps 5.25 Mbps
 
Digital I/O; GPO1, GPO2, TX(6)
VIO Expansion port operating voltage 1.2 V VIO(7) 5 V(8)
VIL Low-level input voltage VIO * 0.2 V
VIH High-level input voltage VIO * 0.8 V
Imax Maximum sink/source current 10 mA
 
ADC, Differential Analog/Digital Conversion pins ADC-, ADC+ (9)
Voltage input 0 V 5 V
Shunt voltage range -81.9175 mV 81.2 mV
Resolution 2.5 µV
Accuracy ±(0.1% + 10 µV)
Input impedance 220 kΩ
 
ADC, Single Ended Analog/Digital Conversion pin ADC+
Voltage input 0 V 5 V
Resolution 1.25 mV
Accuracy ±(0.1% + 7.5 mV)
Input impedance 830 kΩ
 
SENSE, pins SENSE- and SENSE+
Voltage input 0 V 5 V
Resolution 1.5 mV
Accuracy 1%
Input impedance 1 MΩ
(1) USB power capacity and reliability in laptops and desktops greatly depend on host USB port/cable design.
(2) See list of recommended external power supplies and powered USB hubs at our FAQ
(3) Depends on chosen power supply. Otii Arc will monitor internal temperature and cut off if temperature limit is reached.
(4) Sink voltage can go below this specification if locked to high range. It is possible to go down to 0.5 V if the sink current is below 1.9 A. For currents below 19 mA, the measurement will have a lot more noise when locked to high range than in auto range.
(5) Up to 19 mA current in auto range, for higher currents, the accuracy is ±(0.1 % + 150 µA). Average > 1 s.
(6) See Nexperia SN74LVC8T245 for details.
(7) Expansion Port Digital voltage level is set by user in Otii SW.
(8) Maximum voltage will depend on your USB power supply and USB cable.
(9) See TI INA226 for details.

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So, what’s next?

So,
what’s next?

Check out the simulator in the Otii application

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Check out the simulator in the Otii application

Read more

Book a demo session with our tech expert

Book demo

Get your own Otii Arc from one of our distributors

Buy Now

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