Doubt about Suunto 9 Baro altimeter/barometer calibration
-
@mario_b same opinion. Somewhere at 1 h 15 mins after start it started to look ok.
-
@Dimitrios-Kanellopoulos Thanks
. Again, sounds logic.
After my test that I described below I have this doubt: you know with which frequency the S9B take samples of the barometer to calculate and show the altitude? or which is the frequency that update the altitude displayed?I made a simple test using the S9B, Mobile with barometer and Samsung Gear Frontier. I went downstairs one floor (~4m difference).
1st try: S9B not show differences even after ~20sec or a bit more. Mobile and Gear displays the -4m variation instantly, the altitude on these both devices is continuing updating almost on each step that I do down.
I went up. Mobile and Gear displays the variation of +4m. S9B again no differences. After around 5 minutes, I see that the S9B display me a -4m difference (wrong), looks like displays me the value from when I was down, but do not register that I went up again.2nd try: Mobile & Gear again displays correct results instantly and continuously. S9B: I decide give more time waiting on each floor. After few seconds or minute waiting on the lower floor, start to display me a variation of -3m, after few minutes I get the -4m. I went up again, +4m after few seconds or almost a minute.
Results: Mobile & Gear displayed correct value all the times and instantly. S9B worked tricky. One time showed me a correct result but maintained the difference error created on 1st try. 2nd try was perfect, but need sometime to show me the correct values.
-
@flypg I have read about some threshold value which must be reached until an altitude change is recognized by the watch, I think it was about 3m or somewhere in that range. Maybe this kicks in as well …
-
@johann-fuehrer Thanks, yes, this is why I would like know with precision to understand a bit more the watch. I think that also exist some timelapse to process this or display this and this results in the “delay” that I see to display the information.
-
@flypg if it’s the same algorythm that is used in the ambit3 peak for automatic mode then:
When in watch mode, it messures every 10 sec. if you move up/down more then 5 meters in elevation (around 0,6hpa) in 3 minutes, it switches to alti-mode. when your are moving less then 5 meters in 12 minutes the watch switches back to baro-mode -
Thanks @mario_b! Now I can understand for what on 1st try the reaction not was immediately and I got better results on 2nd try.
it messures every 10 sec
Wow, I imagined that should be a lower value, by this I expected a faster response in the update of the altitude readings. But really not need a faster update in watch mode, because for this I have the Sport Modes.
Thanks to everyone again! -
@flypg it counts higher than 3-5m variations in 12 minutes. If you would go a bit more low then both devices should react the same.
That is to wipe out pressure changes as we talked before
-
If you are at a constant altitude (less than 5 meters of vertical movement within 12 minutes), your watch interprets air pressure changes as weather changes and adjusts the barometer graph accordingly.
-
Thanks again to everyone!
Yes @Dimitrios-Kanellopoulos, this explains that on all my attempts I generated a altitude variation > 30m in less than 12 minutes (because I went up and down several times more than the 2 tests).
The only that is not totally clear is the variation of 1st try that the S9B not registered this +4 of when I went up. -
@Dimitrios-Kanellopoulos I have a Spartan Ultra: I’m sitting at the moment in my office at 214m above sea level. I know from the weather station on my altitude just some 2km away, that we have 2015.4 hPa at 30 C temperature. My watch shows me 2021 hPa. If I like to have a correct pressure reading, I would have to change the altitude to 165m. SO how can I bring this together to see correct altitude AND correct pressure?
-
@flypg said in Doubt about Suunto 9 Baro altimeter/barometer calibration:
If you are at a constant altitude (less than 5 meters of vertical movement within 12 minutes), your watch interprets air pressure changes as weather changes and adjusts the barometer graph accordingly.
I published this myself a couple of weeks ago
-
@johann-fuehrer is it sea level pressure? Can you give me now a coarse location (town)? I can look that up for you
-
@Dimitrios-Kanellopoulos
https://www.zamg.ac.at/cms/de/wetter/wetterwerte-analysen/wien/luftdruck/?mode=geo&druckang=redIt’s Vienna and “Wien Unterlaa” is the station I mentioned …
-
@Dimitrios-Kanellopoulos … and yes, it’s seal level pressure. Local pressure is about 993 hPa
You can switch in the pressure chart caption!
-
@Dimitrios-Kanellopoulos said in Doubt about Suunto 9 Baro altimeter/barometer calibration:
Lets keep an eye on this.
I think that I understood some extra… On my workings days I use a lot the stairs. This results in variations of more than 5m in less than 12 minutes, that result that my watch change to alti-mode. When I have a weather change the pressure variation is assinged to the altimeter and by this I see this big changes on the altitude… can be possible or I´m totally wrong?
-
@flypg On watch mode there is no mode
-
@flypg for indoor activities there is automode
-
@johann-fuehrer yeah I see the same from my sources indeed looks like the watch is about 6hpa wrong right ? There is a tool that can calibrate the abs pressure but unfortunately only support can do that.
-
@Dimitrios-Kanellopoulos is there any support here in Vienna which can do this?
-
@johann-fuehrer I am not sure
I am very far away (in terms of internal comms) with support stations etc
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login