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    Doubt about Suunto 9 Baro altimeter/barometer calibration

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    • freeheelerF Offline
      freeheeler @mario_b
      last edited by

      @mario_b
      😱 15’000km service?!
      what was wrong with it?

      living sideways

      mario_bM 1 Reply Last reply Reply Quote 0
      • J Offline
        johann.fuehrer Bronze Member @mario_b
        last edited by

        @mario_b Hm, then I do not understand that:
        LOWW at 8:50 local time: 1020 mBar at 22 degree Celsius, altitude 183m
        ZAMG reading of Schwechat, 9:00 local time 1019.8 (998.6) hPa at 22.1 degrees Celsius, alt 183m
        ZAMG reading in Vienna at 9:00 for all stations in between 1019.4 and 1019.9, of course depending on altitude and temerature, which varies about 2 degrees Celsius.
        My reference from yesterday, Unterlaa at 9:00: 1019.6 mBar (996.6) at 21.8 degrees C, alt 200m
        My reading on the watch: 1024 hPa at 22 degree, alt 209 m

        So it’s off about 4 mBar. Or can you explain this?

        J 1 Reply Last reply Reply Quote 0
        • J Offline
          johann.fuehrer Bronze Member @johann.fuehrer
          last edited by

          @johann-fuehrer … that would be an altitude difference of about 35 m. I used this calculator: https://www.mide.com/pages/air-pressure-at-altitude-calculator

          mario_bM 1 Reply Last reply Reply Quote 0
          • mario_bM Offline
            mario_b @freeheeler
            last edited by

            @TELE-HO šŸ™‚ more a 1000km service. but to be honest. it was nothing wrong. just a few other guys had the same value with ambient pressure, and mine did not match them. but altimeter worked flawlessly.
            i have to say thank you again to @Dimitrios-Kanellopoulos and the awesome suunto customer service for help. they wanted me to send the watch in to check if everything is ok. they’ve exchanged the pressure sensor. now it is spot on. i was just tooo nitpicky. (also i know that it will show a different value over time).

            freeheelerF 1 Reply Last reply Reply Quote 1
            • freeheelerF Offline
              freeheeler @mario_b
              last edited by

              @mario_b
              my experience with Suunto customer service is one of the best I’ve ever experienced!
              My wife had problems with her A3R from start (battery capacity calculation etc) and it was fixed within a week šŸ‘Œ

              Ok, I did not expect huge problems with your watch, good to know šŸ™‚

              I did not play around on the baro settings, I actually only use the alti mode and really never look at the baro itself.
              But it was a very good hint from you regarding the fused alti and when it kicked in. Next time I will know, thank you!

              living sideways

              mario_bM 1 Reply Last reply Reply Quote 1
              • mario_bM Offline
                mario_b @johann.fuehrer
                last edited by

                @johann-fuehrer just to be sure:

                • you know the exact elevation you are when reading your watch pressure? and the altimeter is set correctly?
                • you did the fridge test which @Dimitrios-Kanellopoulos mentioned above?
                • you are not inside a building?
                J 1 Reply Last reply Reply Quote 0
                • mario_bM Offline
                  mario_b @freeheeler
                  last edited by

                  @TELE-HO yes suunto service is fantastic.
                  no it really didn’t.

                  on small hikes i do not record it, but wanna know the nearly correct elevation. and a guy from search and rescue (with an a3p) told me: if you look at the nearest weatherstations ambient pressure and compare that with your watch, you know about +/-10-15 meters if your elevation is correct, without the need of activating gps. and that works very well. šŸ‘

                  1 Reply Last reply Reply Quote 1
                  • J Offline
                    johann.fuehrer Bronze Member @mario_b
                    last edited by

                    @mario_b said in Doubt about Suunto 9 Baro altimeter/barometer calibration:

                    @johann-fuehrer just to be sure:

                    • you know the exact elevation you are when reading your watch pressure? and the altimeter is set correctly?

                    Definitely!

                    • you did the fridge test which @Dimitrios-Kanellopoulos mentioned above?

                    Yes, coming back to exact the same altitude. In my opinion it was very quick, some 5 minutes. But I’ll do it again if you like.

                    • you are not inside a building?

                    No.
                    I did check this also inside the office (open windows), so ambient pressure inside and outside should be equal, no aircondition and the behaviour is the same like outside.

                    mario_bM J 2 Replies Last reply Reply Quote 0
                    • mario_bM Offline
                      mario_b @johann.fuehrer
                      last edited by

                      @johann-fuehrer so maybee it should be recalibrated. i would ask the support.

                      1 Reply Last reply Reply Quote 0
                      • J Offline
                        johann.fuehrer Bronze Member @johann.fuehrer
                        last edited by

                        @johann-fuehrer said in Doubt about Suunto 9 Baro altimeter/barometer calibration:

                        @mario_b said in Doubt about Suunto 9 Baro altimeter/barometer calibration:

                        @johann-fuehrer just to be sure:

                        • you know the exact elevation you are when reading your watch pressure? and the altimeter is set correctly?

                        Definitely!

                        • you did the fridge test which @Dimitrios-Kanellopoulos mentioned above?

                        Yes, coming back to exact the same altitude. In my opinion it was very quick, some 5 minutes. But I’ll do it again if you like.

                        • you are not inside a building?

                        No.
                        I did check this also inside the office (open windows), so ambient pressure inside and outside should be equal, no air condition and the behavior is the same like outside.

                        Finally, meetings are over: watch was 1 hour in the fridge @ 8 degrees Celsius:

                        10:00 before fridge, 1024 hPa, 30 C, @ 210 m
                        11:00 immediately after taking out the fridge, 1024 hPa, 8 C, @ 210m
                        11:15 another 15 mins later…, 1024 hPa, 25 C (still going up) @ 210m

                        LOWW & ZAMG still at 1020/1019.5

                        Dimitrios KanellopoulosD mario_bM 2 Replies Last reply Reply Quote 0
                        • Dimitrios KanellopoulosD Offline
                          Dimitrios Kanellopoulos Community Manager @johann.fuehrer
                          last edited by

                          @johann-fuehrer if not affected by temp your sensor is pretty well clean and no defect

                          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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                          • mario_bM Offline
                            mario_b @johann.fuehrer
                            last edited by

                            @johann-fuehrer are you at the ā€œUmspannwerk Südostā€? that’s the only point which is on 200m elevation. according to different maps, the rest of unterlaa is between 165 and 180m of elevation.

                            J 1 Reply Last reply Reply Quote 0
                            • J Offline
                              johann.fuehrer Bronze Member @mario_b
                              last edited by

                              @mario_b I had been, but now im at Hauptbahnhof/Belvedere which is (funny) also at 200m (Info from Geodatenviewer, wien.gv.at).But the pressure in different altitudes here in Vienna is not that big at the moment so that this would have an effect.

                              mario_bM 1 Reply Last reply Reply Quote 0
                              • mario_bM Offline
                                mario_b @johann.fuehrer
                                last edited by

                                @johann-fuehrer if the baro works, so altimeter is correct, meanwhile i would not mind, because i know over time it slightly drift anyway. but if you care, i would contact the support. the support is really great and helpfull.

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                                • Fatih KaleF Offline
                                  Fatih Kale
                                  last edited by

                                  Hi all,

                                  Yesterday I ran on a track while raining so watch was covered by my jacket.

                                  When I check altitude profile it’s veird. It shows that I went downhill but it’s not possible as I was at the same location turning around. Why could this strange values observed?

                                  Here is altitude profile
                                  link text

                                  Here is the temperature graph
                                  link text

                                  Suunto 9 Baro

                                  freeheelerF sartoricS Brad_OlwinB 3 Replies Last reply Reply Quote 0
                                  • freeheelerF Offline
                                    freeheeler @Fatih Kale
                                    last edited by

                                    @Fatih-Kale
                                    I’ve seen a similar behavior with my Suunto Core some years ago.
                                    When the sensor is covered or in contact with wet skin it seals off and or has a pumping effect.
                                    I would expect that this wrong measurement is detected by fusedalti, but until today I still don’t understand how fusedalti works in detail and what it does over an entire activity or when for some reason the alti is completely off reality.

                                    living sideways

                                    1 Reply Last reply Reply Quote 1
                                    • sartoricS Offline
                                      sartoric Moderator @Fatih Kale
                                      last edited by

                                      @Fatih-Kale
                                      Check if you also have some magnetic stuff (like magnetic jacket cuffs)

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                                      Mff73M 1 Reply Last reply Reply Quote 0
                                      • Mff73M Offline
                                        Mff73 @sartoric
                                        last edited by

                                        @sartoric said in Doubt about Suunto 9 Baro altimeter/barometer calibration:

                                        @Fatih-Kale
                                        Check if you also have some magnetic stuff (like magnetic jacket cuffs)

                                        For altitude issue? 🧐

                                        Suunto Spartan Ultra (since 2016) FW: 2.8.24 (retired)
                                        Suunto Vertical all black
                                        Wife : S9PP
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                                        • isaziI Offline
                                          isazi Moderator
                                          last edited by

                                          Also if it was raining and there was a storm coming in, or any other air front, and you just came out of your place, the altimeter may be adapting to pressure change.

                                          Watch: Suunto Vertical Ti

                                          Blog: isazi's home

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                                          • sartoricS Offline
                                            sartoric Moderator @Mff73
                                            last edited by

                                            @Mff73
                                            mostly for gps (so fusedalti)

                                            SVTS - 2.40.38
                                            SSSWHR BARO Amber - 2.8.32
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                                            Samsung A33 2022 - Android 14 - One UI 6.1
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