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    [Watch] SSU : altitude changes with temperature

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    • Mff73M Offline
      Mff73
      last edited by

      Hello,
      I would like to present you one thing that drives me crazy these days with my SSU (with baro) watch.

      I know that the altitude is calculated from relative atm pressure mesurements, given a reference altitude/atm pressure.
      And I also know that there is a temperature compensation inside watch to correct physical relation between air temperature and read pressure, and then altitude. Everything works perfect with my old Ambit1.

      But these days, with my SSU, I more go outdoor with friends or familiy, and I often need to wait for them, and for each pause I gain meters and meters of descent first, and when I walk/run again, ascent is coming.

      I really think this is due to temperature : when in movement, air near sensor is also moving, and temperature is quite soften, but when stop moving, body temperature impact sensor, and altitude decrease --> D- is increasing.

      Let’s watch this video where i try to simulate this : I start a move with my trail profil (alti settings)
      My video
      1- watch has not been worn since minutes to let it have stable temperature : altitude 545m
      2- i only put two fingers behind watch to warm it --> -9mD- lost in 30s, and when I put my fingers away, altitude increase, and D+ increase.
      3- and I can repeat this process, each time I loose meters and meters. Even more, when body is very hot like these days, and when I stop moving it can be 15mD- lost in a one or two minutes pause.

      In movescount, temperature recorded for this test, in not in relation, you can see altitude profile for this two minute record, with no real change in altitude, but only fingers behind and away.
      0_1532871704365_49a34038-7913-4390-8b97-f9f39cf8e416-image.png

      What do you think about that ?
      Someone can test with his watch, maybe mine has faulty sensor ?

      Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
      Suunto Vertical all black
      Wife : S9PP
      SA: Always the latest beta :)
      Android 13, Galaxy S205G

      Mff73M valdis830V 2 Replies Last reply Reply Quote 0
      • Mff73M Offline
        Mff73 @Mff73
        last edited by

        A comparison of my today move with my SSU red, and my wife Ambit1.
        Same path, just some pause for me :
        0_1532872761335_344b8a33-6430-4804-87c4-d11e70775fa7-image.png

        Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
        Suunto Vertical all black
        Wife : S9PP
        SA: Always the latest beta :)
        Android 13, Galaxy S205G

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        • sartoricS Offline
          sartoric Moderator
          last edited by sartoric

          @Mff73 said in [Watch] SSU : altitude changes with temperature:

          My video

          For sure there is something wrong. In your case you have also negative Avg speed.
          I’ve done “your test” with my baro and it works as expected, just got some few meter asc but I suppose it’s due to gps altimeter fix.

          Have you already tried a reset / reflash ?

          SVTS - 2.40.38
          SSSWHR BARO Amber - 2.8.32
          Samsung A5 2016 - Android 7.0
          Samsung A33 2022 - Android 14 - One UI 6.1
          Suunto App Android 5.2.5 beta
          Suunto App IOs 2.45.0 (19123) beta on MBP M1

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          • Mff73M Offline
            Mff73 @sartoric
            last edited by

            @sartoric
            Thanks for the test.
            And yes, I have done 12s reset, and firmware flash as well.
            Maybe it is time for my SSU to go back Finland for some guaranty expertise.
            I will let some other experts here tell me their feeling before 😉

            Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
            Suunto Vertical all black
            Wife : S9PP
            SA: Always the latest beta :)
            Android 13, Galaxy S205G

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            • Dimitrios KanellopoulosD Offline
              Dimitrios Kanellopoulos Community Manager
              last edited by

              Looks like a problem I need to report!

              The temperature of course affects altitude but it should not when paused.

              Community Manager / Admin @Suunto
              Creator of Quantified-Self.io
              youtube.com/c/dimitrioskanellopoulos
              https://instagram.com/dimitrioskanellopoulos
              https://www.strava.com/athletes/7586105

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              • sartoricS Offline
                sartoric Moderator
                last edited by

                Maybe there is something wrong with GPS receiver (or the accelerometer ?).
                Also the average speed changes significantly

                SVTS - 2.40.38
                SSSWHR BARO Amber - 2.8.32
                Samsung A5 2016 - Android 7.0
                Samsung A33 2022 - Android 14 - One UI 6.1
                Suunto App Android 5.2.5 beta
                Suunto App IOs 2.45.0 (19123) beta on MBP M1

                Dimitrios KanellopoulosD Mff73M 2 Replies Last reply Reply Quote 0
                • Dimitrios KanellopoulosD Offline
                  Dimitrios Kanellopoulos Community Manager @sartoric
                  last edited by

                  @sartoric good point

                  Community Manager / Admin @Suunto
                  Creator of Quantified-Self.io
                  youtube.com/c/dimitrioskanellopoulos
                  https://instagram.com/dimitrioskanellopoulos
                  https://www.strava.com/athletes/7586105

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                  • Mff73M Offline
                    Mff73 @sartoric
                    last edited by

                    @sartoric said in [Watch] SSU : altitude changes with temperature:

                    Maybe there is something wrong with GPS receiver (or the accelerometer ?).
                    Also the average speed changes significantly

                    Hi,
                    My video was made indoor, so GPS was certainly awful.
                    But this phenomenon is totally the same than when I am really outdoor for activity : pause in movement (but not a pause in recording activity).

                    Hi @Dimitrios-Kanellopoulos , thank you for reporting, and I can send you fit files for my last faulty move and my wife’s one to compare if needed.

                    Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                    Suunto Vertical all black
                    Wife : S9PP
                    SA: Always the latest beta :)
                    Android 13, Galaxy S205G

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                    • Mff73M Offline
                      Mff73
                      last edited by

                      @Dimitrios-Kanellopoulos said in [Watch] SSU : altitude changes with temperature:

                      Looks like a problem I need to report!

                      Hi,
                      I can reproduce my issue 100% times.
                      I have just unworn my watch from my wrist, altitude was 520m, 1min after, 530m.
                      And when put watch on my wrist ragain, 30s only after and altitude id 520m again.
                      All that on watch mode.

                      Should I open à ticket ?

                      Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                      Suunto Vertical all black
                      Wife : S9PP
                      SA: Always the latest beta :)
                      Android 13, Galaxy S205G

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                      • Dimitrios KanellopoulosD Offline
                        Dimitrios Kanellopoulos Community Manager @Mff73
                        last edited by

                        @Mff73 Hey hi! !!!

                        Can you shake it? It should change then as well and that is a pressure sensor issue.

                        I just now did the test with running and my Alti changed 1m only and that was due to GPS alti.
                        Take a Look:

                        0_1533061538328_Screen Shot 2018-07-31 at 21.25.16.png

                        This is a 5m pause.

                        0_1533061580238_Screen Shot 2018-07-31 at 21.25.46.png

                        IMHO it looks like a faulty sensor or the sensor got dirty etc.

                        I had my dad watch with the same issue. These are the tests I did:

                        • I shaked it and changed alti.
                        • Make sure you shake it in a way that you “bang” the pressure sensor grill on your palm. That should shake the sensor vertically and change the altitude.
                        • Temperature as only it self should not matter.

                        But there is a solution as well.

                        Hot water at ~35 and:

                        • Leave it in a glass or have it running constantly on the pressure sensor grill under the tap.
                        • Flush again
                        • Very soft toothbrush if there is debrys.

                        If the above do not help then please ask support.

                        PS. If you are leaving in a humid area that affects even more a ‘dirty sensor’

                        Community Manager / Admin @Suunto
                        Creator of Quantified-Self.io
                        youtube.com/c/dimitrioskanellopoulos
                        https://instagram.com/dimitrioskanellopoulos
                        https://www.strava.com/athletes/7586105

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                        • Mff73M Offline
                          Mff73
                          last edited by

                          Thanks for tips.
                          Shake this evening and no effet, but I am waiting for after shower revival 🙂
                          Yes, another symptôme, after shower, or hand in water, altitude decrease by around 80/90m, and stay constant during more than 2 hours.
                          0_1533066196388_IMG_20180731_214219.jpg

                          Will try thé warm water and see.

                          Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                          Suunto Vertical all black
                          Wife : S9PP
                          SA: Always the latest beta :)
                          Android 13, Galaxy S205G

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                          • Dimitrios KanellopoulosD Offline
                            Dimitrios Kanellopoulos Community Manager @Mff73
                            last edited by

                            @Mff73 the water gets in? Then its normal.

                            Community Manager / Admin @Suunto
                            Creator of Quantified-Self.io
                            youtube.com/c/dimitrioskanellopoulos
                            https://instagram.com/dimitrioskanellopoulos
                            https://www.strava.com/athletes/7586105

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                            • Mff73M Offline
                              Mff73 @Dimitrios Kanellopoulos
                              last edited by

                              @Dimitrios-Kanellopoulos
                              Yes, but 2 hours to get out 😞
                              If I put my old ambit 1 in water and Shake it, I retreive good altitude in à couple seconds.
                              With my SSU, now, whatever I do, I have to wait.
                              For now, watch is in warm water. Let see.

                              Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                              Suunto Vertical all black
                              Wife : S9PP
                              SA: Always the latest beta :)
                              Android 13, Galaxy S205G

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                              • Dimitrios KanellopoulosD Offline
                                Dimitrios Kanellopoulos Community Manager @Mff73
                                last edited by

                                @Mff73 oh. Something is funky. Mine comes back at about 30m Max after poool swimming 1hour. Both s9 and ssu. From what you say looks kapot.

                                Community Manager / Admin @Suunto
                                Creator of Quantified-Self.io
                                youtube.com/c/dimitrioskanellopoulos
                                https://instagram.com/dimitrioskanellopoulos
                                https://www.strava.com/athletes/7586105

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                                • Mff73M Offline
                                  Mff73
                                  last edited by

                                  Hi folks,

                                  My ticket is on the way
                                  0_1533287340283_163309fc-25d4-4846-9d02-5accf241fee6-image.png
                                  Let’s wait and see, I will let you know 😉

                                  Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                                  Suunto Vertical all black
                                  Wife : S9PP
                                  SA: Always the latest beta :)
                                  Android 13, Galaxy S205G

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                                  • valdis830V Offline
                                    valdis830 @Mff73
                                    last edited by valdis830

                                    Temperature affects, but I think not so much. Around 0.6 m for each degree ??

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                                    • Mff73M Offline
                                      Mff73 @valdis830
                                      last edited by

                                      @valdis830
                                      I think the same, but, it is the only parameter that I think is modifiés when I just put my finger behind thé watch.
                                      No news from support for now. 🤔

                                      Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                                      Suunto Vertical all black
                                      Wife : S9PP
                                      SA: Always the latest beta :)
                                      Android 13, Galaxy S205G

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                                      • Mff73M Offline
                                        Mff73
                                        last edited by

                                        Support answers me to restart watch and let it on table for a day (for électrostatic reason) and if nothing better, send it to Finland.

                                        My SSU is on the way to Finland 😁
                                        Wait and see : repair/replacement or maybe they will find nothing 😲

                                        Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                                        Suunto Vertical all black
                                        Wife : S9PP
                                        SA: Always the latest beta :)
                                        Android 13, Galaxy S205G

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                                        • Mff73M Offline
                                          Mff73
                                          last edited by

                                          No news from Finland, but since then, I re use my Ambit 1, and Altitude doesn’t change without any reason, and after shower, just shake the watch to make water out sensor, and altitude becomes correct (more than two hour with SSU).
                                          I wait eagerly my spartan to come back to see how it works 🙂

                                          Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                                          Suunto Vertical all black
                                          Wife : S9PP
                                          SA: Always the latest beta :)
                                          Android 13, Galaxy S205G

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                                          • Dimitrios KanellopoulosD Offline
                                            Dimitrios Kanellopoulos Community Manager @Mff73
                                            last edited by

                                            @Mff73 try blowing gently air in the spartan. It takes then 1minutes.

                                            Community Manager / Admin @Suunto
                                            Creator of Quantified-Self.io
                                            youtube.com/c/dimitrioskanellopoulos
                                            https://instagram.com/dimitrioskanellopoulos
                                            https://www.strava.com/athletes/7586105

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