# Arc/Ace Pro **URL:** https://forum.qoitech.com/c/community-support/otii-arc-ace/17.md [Latest](https://forum.qoitech.com/latest.md) · [Categories](https://forum.qoitech.com/categories.md) --- ## [About the Otii Arc Pro category](https://forum.qoitech.com/t/about-the-otii-arc-pro-category/396)
**Author:** [@vanja79](https://forum.qoitech.com/u/vanja79)\ **Replies:** 0
All about Otii Arc Pro hardware and software --- ## [Otii Arc reverse current whlie not in sink mode](https://forum.qoitech.com/t/otii-arc-reverse-current-whlie-not-in-sink-mode/571)
**Author:** [@dstude](https://forum.qoitech.com/u/dstude)\ **Replies:** 3\ **Last updated:** [May 19, 2026, 7:05am UTC](https://forum.qoitech.com/t/otii-arc-reverse-current-whlie-not-in-sink-mode/571 "2026-05-19T07:05:51Z")
I have a charger trying to drive about 600 mA constant current into the Otii Arc while at 4V. the current actually driven increases as i reduce the voltage so it appears I’m running into some limitation. Is this practi… --- ## [OTII-ACE-PRO not powering on / "Failed to open COM" error](https://forum.qoitech.com/t/otii-ace-pro-not-powering-on-failed-to-open-com-error/556)
**Author:** [@polgero](https://forum.qoitech.com/u/polgero)\ **Replies:** 1\ **Last updated:** [September 22, 2025, 6:20am UTC](https://forum.qoitech.com/t/otii-ace-pro-not-powering-on-failed-to-open-com-error/556 "2025-09-22T06:20:10Z")
Hello Qoitech Community, I’m seeking some urgent assistance with my OTII-ACE-PRO. I recently used it to power a Starlink device, and unfortunately, it no longer seems to be functional. When I connect the OTII-ACE-PRO t… --- ## [Arc unresponsive](https://forum.qoitech.com/t/arc-unresponsive/554)
**Author:** [@hi1](https://forum.qoitech.com/u/hi1)\ **Replies:** 2\ **Last updated:** [July 28, 2025, 9:55am UTC](https://forum.qoitech.com/t/arc-unresponsive/554 "2025-07-28T09:55:51Z")
After I pressed and held the reset button on its back until an audible click occurred, the Arc has gone dark. No serial port visible (Linux), no blinking LED, no nothing. What state have I entered, and how do I exit it? … --- ## [Change UART Line terminator 3.x.x](https://forum.qoitech.com/t/change-uart-line-terminator-3-x-x/553)
**Author:** [@sleinwoib](https://forum.qoitech.com/u/sleinwoib)\ **Replies:** 1\ **Last updated:** [July 28, 2025, 6:04am UTC](https://forum.qoitech.com/t/change-uart-line-terminator-3-x-x/553 "2025-07-28T06:04:08Z")
Hello, Coming from version 2.x to the version 3.x, I fail to find how to change the line terminator and adding an external UART to the recording. Do I miss something or is this option not available on version 3.5.5 of… --- ## [Otii Ace pro power supply for Jetson AGX Orin](https://forum.qoitech.com/t/otii-ace-pro-power-supply-for-jetson-agx-orin/514)
**Author:** [@romyull](https://forum.qoitech.com/u/romyull)\ **Replies:** 8\ **Last updated:** [December 27, 2024, 1:15pm UTC](https://forum.qoitech.com/t/otii-ace-pro-power-supply-for-jetson-agx-orin/514 "2024-12-27T13:15:18Z")
Hi, Can you recommend any power supply that can perfectly work to supply enough power for the Jetson AGX Orin device? It can work on 12V-3A and 20V-4.5A. I am using just a USB cable to supply power to Raspberry Pi from… --- ## [Bricked device - need help](https://forum.qoitech.com/t/bricked-device-need-help/515)
**Author:** [@dduchna](https://forum.qoitech.com/u/dduchna)\ **Replies:** 1\ **Last updated:** [October 25, 2024, 6:18am UTC](https://forum.qoitech.com/t/bricked-device-need-help/515 "2024-10-25T06:18:07Z")
Dear support, please help mi with an issue. I got Otii Arc which is discovered under windows in device manager as: “Arc Firmware Upgrade Port”. But Otti 3.5.2 do not recognize it. I have found some topics on this forum … --- ## [Nothing is printing on UART Console](https://forum.qoitech.com/t/nothing-is-printing-on-uart-console/489)
**Author:** [@john7560](https://forum.qoitech.com/u/john7560)\ **Replies:** 1\ **Last updated:** [June 20, 2024, 7:49am UTC](https://forum.qoitech.com/t/nothing-is-printing-on-uart-console/489 "2024-06-20T07:49:30Z")
When linking the TX pin from the Nucleo-L053R8 board to the RX pin on the OTii, and grounding (GND) to the digital ground (DGND) of the OTii, and activating UART with a baud rate set to 9600, followed by initiating the U… --- ## [Failed to firmware upgrade](https://forum.qoitech.com/t/failed-to-firmware-upgrade/484)
**Author:** [@baldurlabs](https://forum.qoitech.com/u/baldurlabs)\ **Replies:** 0\ **Last updated:** [December 23, 2023, 9:27pm UTC](https://forum.qoitech.com/t/failed-to-firmware-upgrade/484 "2023-12-23T21:27:50Z")
I have one of the good old Otii devices that I have not been using for a couple of years, so I wanted to firmware upgrade it. However, this has given some unexpected issues. I have both tried to firmware upgrade it from… --- ## [Otii Arc Pro - Core error 3221226505](https://forum.qoitech.com/t/otii-arc-pro-core-error-3221226505/479)
**Author:** [@federico](https://forum.qoitech.com/u/federico)\ **Replies:** 2\ **Last updated:** [November 27, 2023, 8:08am UTC](https://forum.qoitech.com/t/otii-arc-pro-core-error-3221226505/479 "2023-11-27T08:08:39Z")
Hi all, I’m using the Otii Arc Pro device and the TCP Server API to conduct a rather long experiment campaign, but after about 3 hours the experiments crashed. In my script log I found the line “Undocumented error: {‘ty… --- ## [Time Offset for charts](https://forum.qoitech.com/t/time-offset-for-charts/477)
**Author:** [@mtudvikling](https://forum.qoitech.com/u/mtudvikling)\ **Replies:** 2\ **Last updated:** [October 2, 2023, 8:50am UTC](https://forum.qoitech.com/t/time-offset-for-charts/477 "2023-10-02T08:50:35Z")
Hi, I am confused about the features of the Otii 3 (v.3.4.0 - Pro license) Given this comment : Feature requests - improved charting; I was under the impression that you can add a time offset to easily compare recordin… --- ## [Otii Arc non-stop sourcing?](https://forum.qoitech.com/t/otii-arc-non-stop-sourcing/476)
**Author:** [@ebikeotii8](https://forum.qoitech.com/u/ebikeotii8)\ **Replies:** 1\ **Last updated:** [September 8, 2023, 6:07am UTC](https://forum.qoitech.com/t/otii-arc-non-stop-sourcing/476 "2023-09-08T06:07:26Z")
Hi guys. I have been using our Otii Arc in an automated test setup for some time, the setup is like following: Otii powered by external DC power supply + USB. Device under test is powered by Otii, and the device is nev… --- ## [Otii Ace Pro external wall adapter](https://forum.qoitech.com/t/otii-ace-pro-external-wall-adapter/470)
**Author:** [@bc\_metco](https://forum.qoitech.com/u/bc_metco)\ **Replies:** 4\ **Last updated:** [May 16, 2023, 6:10pm UTC](https://forum.qoitech.com/t/otii-ace-pro-external-wall-adapter/470 "2023-05-16T18:10:41Z")
Hey, can anyone recommend a wall adapter for ACE pro? Thanks! --- ## [ERROR: Registry editing has been disabled by your administrator](https://forum.qoitech.com/t/error-registry-editing-has-been-disabled-by-your-administrator/466)
**Author:** [@marcinpostek](https://forum.qoitech.com/u/marcinpostek)\ **Replies:** 1\ **Last updated:** [April 12, 2023, 10:44am UTC](https://forum.qoitech.com/t/error-registry-editing-has-been-disabled-by-your-administrator/466 "2023-04-12T10:44:28Z")
Hi, On my corporation laptop, I have access to Windows registers blocked. So when I want to run Otii 3x, I get: “2023-04-11T13:46:03.349Z \[error:renderer\] Error: Error while obtaining machine id: Error: Command failed:… --- ## [Otti 3 - The basic software has a limit of max 1 recording](https://forum.qoitech.com/t/otti-3-the-basic-software-has-a-limit-of-max-1-recording/455)
**Author:** [@pavlos](https://forum.qoitech.com/u/pavlos)\ **Replies:** 3\ **Last updated:** [December 5, 2022, 7:55am UTC](https://forum.qoitech.com/t/otti-3-the-basic-software-has-a-limit-of-max-1-recording/455 "2022-12-05T07:55:01Z")
Dear Qoitech team, A few weeks ago, I upgraded my software and firmware to Otii3.0. I ended up creating an account as well. I have to say it seems to be better in terms of UI(when you get used to it) and more stable tha… --- ## [Reading Otii Arc data to Labview or Python](https://forum.qoitech.com/t/reading-otii-arc-data-to-labview-or-python/443)
**Author:** [@shayc](https://forum.qoitech.com/u/shayc)\ **Replies:** 5\ **Last updated:** [October 4, 2022, 8:24am UTC](https://forum.qoitech.com/t/reading-otii-arc-data-to-labview-or-python/443 "2022-10-04T08:24:35Z")
We consider buying the OTII ARC as part of a Testing Automation Project, to measure accurately the work and idle currents. We are using a testing automation software (Quali TestShell) for the entire test bench My quest… --- ## [Adjusting max sink current to 1.5A](https://forum.qoitech.com/t/adjusting-max-sink-current-to-1-5a/450)
**Author:** [@arandasan](https://forum.qoitech.com/u/arandasan)\ **Replies:** 0\ **Last updated:** [November 2, 2022, 3:29pm UTC](https://forum.qoitech.com/t/adjusting-max-sink-current-to-1-5a/450 "2022-11-02T15:29:18Z")
Hello forums, I’ve just got up and running with my new Otii Arc, and I’m loving the experience so far. It has added a lot of value to my projects already. So thank you for a great product. I have an application where I… --- ## [The oti arc messes up transmissions on my lora module](https://forum.qoitech.com/t/the-oti-arc-messes-up-transmissions-on-my-lora-module/434)
**Author:** [@sejsbo](https://forum.qoitech.com/u/sejsbo)\ **Replies:** 1\ **Last updated:** [April 12, 2022, 6:12am UTC](https://forum.qoitech.com/t/the-oti-arc-messes-up-transmissions-on-my-lora-module/434 "2022-04-12T06:12:08Z")
Hi, I have a small project where I have a raspberry pi connected to a lora module. We wanted to test the power consumption of the lora module connected to the otii arc So we took the oti arc and clipped it on to gorund… --- ## [Long tests and Calibration messages](https://forum.qoitech.com/t/long-tests-and-calibration-messages/430)
**Author:** [@wleatlanta](https://forum.qoitech.com/u/wleatlanta)\ **Replies:** 6\ **Last updated:** [February 23, 2022, 7:04am UTC](https://forum.qoitech.com/t/long-tests-and-calibration-messages/430 "2022-02-23T07:04:32Z")
My otii shuts off when the UI puts up '‘reminder’'s about “calibration recommended”… Is there ANY way to let the logging continue and the power stay on!\>??? nightmare for long testing!!! wle --- ## [Version 2.8.3 looses ARC during operation](https://forum.qoitech.com/t/version-2-8-3-looses-arc-during-operation/426)
**Author:** [@shrikrishna.b](https://forum.qoitech.com/u/shrikrishna.b)\ **Replies:** 1\ **Last updated:** [February 10, 2022, 1:36pm UTC](https://forum.qoitech.com/t/version-2-8-3-looses-arc-during-operation/426 "2022-02-10T13:36:20Z")
Hi, I am using version 2.8.3. Sometime I see during operation, I could not control ARC from the application. I need to restart the application. Has anyone seen this issue? Thanks Shri --- ## [Main voltage](https://forum.qoitech.com/t/main-voltage/423)
**Author:** [@appulz](https://forum.qoitech.com/u/appulz)\ **Replies:** 2\ **Last updated:** [January 5, 2022, 9:06am UTC](https://forum.qoitech.com/t/main-voltage/423 "2022-01-05T09:06:49Z")
Hi, I am new to the otii arc and have a question about the power source. I set mine to 3.6V (connected by usb port). On the graph, the average is 3.6V but there seem to be fluctuations (see photo). Is this normal… --- ## [What kind of upgrades can I make to my PC to make big datasets more usable?](https://forum.qoitech.com/t/what-kind-of-upgrades-can-i-make-to-my-pc-to-make-big-datasets-more-usable/410)
**Author:** [@jaanshgo](https://forum.qoitech.com/u/jaanshgo)\ **Replies:** 4\ **Last updated:** [November 30, 2021, 8:22am UTC](https://forum.qoitech.com/t/what-kind-of-upgrades-can-i-make-to-my-pc-to-make-big-datasets-more-usable/410 "2021-11-30T08:22:54Z")
Hello, currently when working with multiple days worth of data it is almost impossible to use the program. It is very slow and has even frozen up on me multiple times. I’ve let it run days to find it is still frozen, rea… --- ## [Where do the log files live, what is their extension?](https://forum.qoitech.com/t/where-do-the-log-files-live-what-is-their-extension/390)
**Author:** [@larryenglish](https://forum.qoitech.com/u/larryenglish)\ **Replies:** 2\ **Last updated:** [September 17, 2021, 1:25pm UTC](https://forum.qoitech.com/t/where-do-the-log-files-live-what-is-their-extension/390 "2021-09-17T13:25:55Z")
where do the log files live, what is their extension? \[windows 10\] wle --- ## [How does Otti Arc estimate battery lifetime?](https://forum.qoitech.com/t/how-does-otti-arc-estimate-battery-lifetime/389)
**Author:** [@hoan](https://forum.qoitech.com/u/hoan)\ **Replies:** 1\ **Last updated:** [September 10, 2021, 6:58am UTC](https://forum.qoitech.com/t/how-does-otti-arc-estimate-battery-lifetime/389 "2021-09-10T06:58:34Z")
I just wonder, how does Otti Arc calculate battery lifetime (in years, months, days,…) in Battery Life Estimator tool? I’ve looked for tutorials on Google, found some equations, formulas,… but some current & time paramet… --- ## [OTII voltage regulator broken?](https://forum.qoitech.com/t/otii-voltage-regulator-broken/387)
**Author:** [@angelicacz](https://forum.qoitech.com/u/angelicacz)\ **Replies:** 2\ **Last updated:** [September 6, 2021, 8:01am UTC](https://forum.qoitech.com/t/otii-voltage-regulator-broken/387 "2021-09-06T08:01:03Z")
Hi, I have been performing measurements with OTII HW version 1.3 and firmware version 1.1.5. The DUT has a supply voltage of 3.6V. I have seen higher voltage drops (up to 1V drop) than expected: I have measured by … --- ## [The 500mA sink limit](https://forum.qoitech.com/t/the-500ma-sink-limit/375)
**Author:** [@tts](https://forum.qoitech.com/u/tts)\ **Replies:** 2\ **Last updated:** [April 27, 2021, 9:00am UTC](https://forum.qoitech.com/t/the-500ma-sink-limit/375 "2021-04-27T09:00:09Z")
Hello, When in a constant voltage mode there is a 500mA current sink capability but what happens if it needs to sink more? is it safe to go over it as long as the voltage won’t rise over 5V? --- ## [Use OTII in docker](https://forum.qoitech.com/t/use-otii-in-docker/344)
**Author:** [@jcheng](https://forum.qoitech.com/u/jcheng)\ **Replies:** 17\ **Last updated:** [March 22, 2021, 1:16pm UTC](https://forum.qoitech.com/t/use-otii-in-docker/344 "2021-03-22T13:16:30Z")
Hi there, I have been using the product locally for a while and it works perfectly fine. Now our team wants to integrate OTII into Jenkins and running in a docker container environment, but right now seems have some iss…