Otii Ace Pro

Otii Ace Pro

Power profiler, DC energy analyzer, power supply, digital multimeter, source measure unit, power debugger. One box to rule all. 

Now for higher voltages.
Still easy to use, yet more advanced. 

Power supply: 0V-25V

Wide dynamic range: nA-5A

Current measurement resolution: 0.4nA

No burden voltage

Adjustable sample rate up to 50ksps

Isolated power supply

UART sync with the measurements

Best-in-class multiplatform UI and software

Otii Ace Pro is the big brother to Otii Arc, and is an instrument that can precisely source voltage (up to 25 V) and current (up to 5A) and simultaneously measures voltage and/or current with a high sample rate (50ksps) and low step size. It computes power and energy and enables engineers and developers to easily see and optimize the energy consumption and battery life of their devices under test.

It comes with featured-packed Otii basic perpetual software and 1-year Otii Pro software.

Use Otii Ace Pro every day to: 

  • power your devices under development
  • energy profile microcontrollers, sensors, devices and electronics up to 25V in real-time and over time
  • optimize sleep current, extend battery life
  • measure inrush current 
  • measure component leakage current over time 
  • design power-efficient hardware, firmware and software through regression testing
  • troubleshoot your hardware and software

and much more!

Key features

Powerful power supply and analyzer, all in one

Otii Ace Pro is a 2 quadrant source measure unit (SMU) with a constant voltage/constant current source and sink and a high precision multichannel multimeter.

Use it as an isolated power supply, 0V-25V.   Use it as a power analyzer/profiler to record and display real-time currents, voltages, power and/or UART logs. It provides less than nA resolution current measurements with adjustable sample rate up to 50ksps. The high sample rate and low step size enable accurate analysis of current consumption and inrush current.  

Otii Ace Pro has active voltage regulation and compensates for burden voltage.

Isolated power supply

Otii Ace Pro is an isolated power supply that enables diverse use cases and power configurations. 

Connect several Otii Ace Pro devices in series and parallel to increase voltage and current capabilities. Measure systems where battery negative terminal is not the system ground. Measure with your energy source (for example your battery or energy harvester) in series while switching between measurement ranges.

Best in class software, for all our boxes

Test and measurement instruments can have killer software and we are here to prove it. The best hardware deserves nothing less than the best software so you get to spend your time energy optimizing your product. 

Otii software comes as a powerful yet easy-to-use desktop application for Ubuntu, Windows & macOS. 

Check the statistics of the accumulated energy consumption continuously while recording. Compare recordings, hide and show relevant data and stats. 

Synchronize expansion port and power measurements

Connect your device to Otii Ace’s expansion port. Log GPIs, ADC subsystem measurements and UART logs. All the recordings are synced to the current and voltage graphs making it easy to correlate power consumption to the application state.

Very wide dynamic range

Measure accurately over 9 orders of magnitude from amps down to tens of nanoamps with the wide dynamic range of Otii Ace Pro.

Display and work with accurate visualization of the active and sleep modes on the same screen and in the same project. 

Compact, portable and quick to get started

From unpacking Otii Ace Pro to measurement in less than 1 minute. Power it by USB C for portability. 

Otii Ace Pro measures 10,9cm x 14,4cm x 4,4cm (WxLxH) and weighs 450 grams, just as Otii Arc. 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 is needed and therefore no noise. 

Min Unit Max
Temperature 10 °C / 50 °F 30 °C / 86 °F
Humidity 30% 60%
Output voltage 0V 25V
Output voltage setting resolution 1 mV
Self-consumption 3.5W
Output power, max continuous 30W(1,5)
Output power, max peak 50W(1)
Voltage between USB/DC jack and Main – -200V(2,3) 200V(2,3)
Voltage between expansion DGND/AGND and Main – -200V(2,3) 200V(2,3)
PROGRAMMABLE CURRENT SINK (requires an Otii Toolbox license)
Sink current 0 A 5 A
Sink current, setting resolution 1 µA
Sink voltage 0 V 25V
Sink power, max continuous 15W
Sink power, max peak 125W
Digital I/O
Accuracy 0-5A ±(0.05% + 25nA)
Resolution 0.4nA
Internal sample rate 250 ksps
Analog bandwidth (3 dB) 50 kHz
Accuracy ±(0.01% + 1 mV)
Internal sample rate 250 ksps
Analog bandwidth (3 dB) 50 kHz
Output voltage readback resolution 3.5uV
Bitrate 50 bps 5.25 Mbps
Digital I/O
Digital IO operating voltage 1.2V Vio 5V
VIL Low-level input voltage Vio*0.2V
VIH High-level input voltage Vio*0.8V
Imax Maximum sink/source current (total for all GPIOs) -10mA 10mA
ADC, Differential Analog/Digital Conversion pins ADC-,ADC+
Voltage input -10V 25V
Shunt voltage range -102.4mV 102.4mV
Resolution 12.2nV
Accuracy ±(0.1% + 1 uV)
Input impedance >100Mohm
ADC, Single ended Analog/Digital Conversion pins ADC-,ADC+
Voltage input -10V 25V
Resolution 3.1uV
Accuracy ±(0.1% + 250uV)
Input impedance >100Mohm
Voltage input -10V 25V
Resolution 3.1uV
Accuracy ±(0.1% + 250uV)
Input impedance >100Mohm
Output voltage 0V 15V
Output voltage setting resolution 5mV
Output current 600mA
Voltage between USB/DC jack GND and Expansion Port DGND/AGND -200V(2,3) 200V(2,3)
Input voltage 7V 20V
Input current 5A
VBUS voltage(4) 4.75V 20V
VBUS current(4) 3A
(1) Depends on available input power
(2) USB and DC jack GND is connected internally to chassis GND
(3) DGND and AGND are internally connected
(4) USB PD 2.0
(5) Max 3A in on DC plug in and max 4A output current

Otii Ace Pro comes with Otii Basic and 1-year Otii Pro Software license for free. 

Otii Pro and its add-ons – Otii Toolboxes can be purchased monthly, yearly or as a perpetual license.

Otii software runs on Windows, Ubuntu and macOS.

To run Otii Ace Pro, download Otii software here: 

Software comparison

Feature Basic Pro
Basic measurements (current, voltage, power)
GPI measurements
ADC (sub-system) measurements
Save/load projects
Basic statistics
Unlimited undo/redo
Offset calibration
Export CSV
Export project
Multiple recordings
Record more than 10 minutes
Record UART logs
Sync data with UART logs
Sync multiple recordings
Multiple Otii boxes
Set sample rate (Otii Ace Pro only)
Customize statistics
Filter log
Battery life calculator
4-wire support
In-line measurement support (Otii Ace Pro only)
Offline license (Otii Ace Pro only)
Import from another project
Import logs
Record UART TX
Logarithmic scale

Software add-ons for Otii Pro

Feature Otii Automation Toolbox Otii Battery Toolbox
Scripting in any language using JSON API
Packaged scripting modules available for Python, Matlab, C#, Java
Battery emulation
Battery profiling

Want to manage shared or offline licenses, or looking for volume licenses across the teams?

Looking for perpetual licenses?

What is the difference between Otii Arc Pro and Otii Ace Pro?

The biggest difference between the Otii Arc Pro and Otii Ace Pro hardware is in the power supply and sampling rate. Otii Arc Pro goes up to 5 V and has the sampling rate of 4ksps and goes Otii Ace Pro up to 25 V and has the sampling rate of 50 ksps.

Here is the detailed hardware comparison between Otii Arc Pro and Otii Ace Pro.

What is included when I purchase Otii Ace Pro?

In the package, you will receive Otii Ace Pro with 1-year free Otii Pro software, a USB C cable and a USB A to USB C adapter.

What is Otii Pro software that comes with Otii Ace Pro?

Otii Pro is the best-in-class software for measuring and analyzing energy consumption. It works with all Otii hardware boxes. You can subscribe to Otii Pro software on a monthly or yearly basis. If you are not a subscriber, you can request a perpetual license that best suits your needs.

Check out Otii Pro software features list here.

How do I activate my license?

Please follow these simple steps here.

How can I request customized plan for my team?

If you are looking for a customized plan for your team’s and company’s needs, please contact our Sales team directly. We will be more than happy to respond to your request and help you achieve your project or business goal with our most suitable tools.

How do I choose the right external DC adapter for Otii Ace Pro?

If you choose to run with an external DC adapter, we recommend you to pick one from an established supplier. The adapter should be low noise, approved for IEC 60950-1 as a Limited Power Source. The output from the DC adapter can be in the range 7-20V, max 5A. Pick an adapter that is able to provide a little more than the output power you will need. Be aware that the voltage drop in most cables at 5A is not negligible.

Otii Ace voltage and power output range: 0-25V, 0-15W
In most cases, the power supplied by your computer’s USB C ports will be sufficient since Otii Ace has PD implemented. However, not all computer’s USB C ports are created equal, today you mainly find 15W support, and if you experience problems you might need an external power supply, see the next section. Hint: By enabling ”meters” (Device => Meters) you can see the actual voltages. VBUS is the USB voltage. If this goes below 4.75V, you should switch to an external DC adapter. The input voltage from the external DC connector is also monitored (VDC) and this should not go below 7V.

Otii Ace voltage and power output range: 0-25V, 15-30W continuous power
For this you should use an external DC adapter. There are many good ones available, and we recommend you pick a certified one of good quality with sufficient power rating and 7-20VDC, max 5A output. One example is TRH70A180-11E03 VI from Cincon Electronics Co. LTD, and available through Digikey.com but there are many more to pick from.

Otii Ace voltage output range: 0-25V, 30-50W peak power
Otii Ace can support output power of more than 30W and less than 50W but not continuously. Otii Ace will be overheated if too much power is sourced and an overtemperature protection will shut down the power supply if needed.

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