According to this posts here https://forum.xda-developers.com/smartwatch/amazfit/spo2-amazfit-pace-t4069147
We could measure level of spo2 with ppg sensors.
My amazfit gtr 42mm have double leds on the back so in theory it could measure level of spo2. Is that true?
Thank you for your time and help.
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I bought a Stratos to replace my amazfit bip and playing soccer, my stratos show around 185 bpm. It's impossible such reading. My old bip never showed more than 150 bpm (using treadmill as activity).
Is this sensor so bad? Can be improved in future updates?
As test I compared it to my fitbit and garmin and al readings are quite the same in workout and rest/sleep.
If I have a sprint or Hiit training my heart rate can spike to 190bpm. So 185 is possible depending on your workout.
Make sure your watch has the latest firmware, reset its data (factory reset then do not restore old data when pairing again) and use continuous HR for at least 24h and it should works a little better. Unfortunately the PPG sensor used in both Pace and Stratos isn't the best one around...
Hi Vogal , I'm experiencing the same as you.
I had a Bip for a year and a half. In the beginning HR was always 20 beats too low. If I wore in on the inside of my wrist, it was almost perfect.
I recieved my Stratos yesterday, it updated itself 3 times, even to the latest 2.3.8 that was released yesterday. I unpaired, rebooted, repaired, but didn't factory reset. HR is ALSO 20-30 beats to high. When standing still, measurement is perfect. But when moving, it's awful. On both watches.
Did you do a factory reset? Did it help?
My stratos HR works fine in spinning and elliptical machine. I compared it with another hr monitor with chest strap and both show very similar values. The problem is in outdoor activity like MTB. Here the stratos seems not realize about peaks of exercise and It always shows moderate values below 150 when the chest strap gives me values over 165. I tried tighting it more and different positions on my wrist but without any read improvement.
People, Pace/Stratos/Verge use a PPG sensor, it will never be accurate if you move your wrist/arm a lot, it is specially true when riding a bike... If HR accuracy is needed, use an external HR band.
The problem isnt the Stratos
Vogal said:
I bought a Stratos to replace my amazfit bip and playing soccer, my stratos show around 185 bpm. It's impossible such reading. My old bip never showed more than 150 bpm (using treadmill as activity).
Is this sensor so bad? Can be improved in future updates?
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The problem isnt the Stratos, its de Bip. I had one and never gave me the same value of the HR mesure of the running machine, also I tried with an Apple watch in other wirst and both, the running machine (also the eliptical) and the apple show me the same HR but the Bip was allways 30-40 beats lower
I bought Amazfit Bip two days ago, but barometer is only showing very low hPa (948.3-951.5) although the weather is clear and sunny (30 Celsius), is this normal or is this sensor defective?
Thank you for your help!
blackmatrix64 said:
I bought Amazfit Bip two days ago, but barometer is only showing very low hPa (948.3-951.5) although the weather is clear and sunny (30 Celsius), is this normal or is this sensor defective?
Thank you for your help!
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I have the same problem. Were you able to resolve this?
Did you check if it measures differences in air pressure correctly? Sometimes the body heat from your wrist can throw off the sensor as well.
I've noticed that the baseline elevation stats on my unit are off by around 30 meters, but the relative elevation stats are usually accurate.
Ideally there should be an option for manual recalibration but I doubt that Amazfit will ever add such feature, especially now when the device is already a few years old.
Your barometer is just fine. I had the same issue ( which was infact not an issue).
Go through this thread.
https://www.reddit.com/r/amazfit/comments/mkc7y9/_/gtgzy3y
I always wondered what would happen at Panama Canal. Which side would be sea level.
recently got the verge but it always shows my hr around 110, The BiP and a cheap fitness band shows my hr around 85-90. So I did a test and even in the air, it measures hr, https://www.youtube.com/watch?v=DsbO8fZcisA . Firmware version 3.2.5.0 global. Should I return it?
Hi guys,
I just got my new Amazfit GTR and noticed strange behavior of heart rate monitor. It shows values even if the device is not on my wrist. I left the device on the table for more than hour and any time I looked on main screen there was heart rate value and it was also changing the values. So it wasn't just last value stuck. I tried to run exercise activity while leaving device on the table and it was showing heart rate as well. Not all the time but sometimes there was value and sometimes not. So is the device faking heart rate values? Is it normal behavior?
It is how PPG sensors work, they use the reflected light to estimate the number of beats. Search the internet for more info.
Well, I have another watch with PPG sensor but they don't show nothing when they are not on wrist.
So it will probably not be about sensor type. In this case they for example report my rest heart rate during the night even if they lay next to me on the table so the values will be completely faked.
The sensor works that way, but other devices may use *other* sensors to disable the reading when they detect the watch isn't being used, the accelerometer for instance.
HR
lfom said:
The sensor works that way, but other devices may use *other* sensors to disable the reading when they detect the watch isn't being used, the accelerometer for instance.
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HEyy,
- Also got 2 other product with the same comportment `` Fitbit Charge Hr ´´ and `` Fitbit Blaze ´´ , both detect when they are not in the wrist. Why doen's GTR do the same?
- Also both got more accuracy in Heart rate measurments...Because they are doing it consistently. With Amazfit GTR i only can program it to do it 1min in 1min. Already change it with Notify & Fitness. nothing seems to change....
- Another outburst from my side : heart rate scale doen't save scores higher than 180 BTM !
Are some of them just software issues ?
Regards to all
The heart beat sensor on the GTR is utter garbage. It does indeed fake heart beat results. Also the sleep analysis functionality is totally broken.
Just got my GTR and the heart rate monitoring is way off. Always some 20 to 35 Beats above the real one. As I have some hair I tried it in my finger and in my belly with the same wrong results. The firmware version is 1.3.4.19 which was updated immediately after first turn on. In contrast the free Android app I use is pretty accurate. I will still test the GPS.
Kaka0 said:
Just got my GTR and the heart rate monitoring is way off. Always some 20 to 35 Beats above the real one. As I have some hair I tried it in my finger and in my belly with the same wrong results. The firmware version is 1.3.4.19 which was updated immediately after first turn on. In contrast the free Android app I use is pretty accurate. I will still test the GPS.
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I returned the GTR and got another one from another vendor and it has the same problem. I can now say that the heart rate monitoring in the GTR is useless, just a boring toy.
Amazfit admits that the heart rate monitor is "prone to inaccuracies" in its faq: https://support.amazfit.com/us/faq/839
As the heart rate sensor is basically a pulse oximeter which monitors the perfusion of blood to the dermis, it’s prone to inaccuracies.That’s because skin perfusion — a measure of how much blood flows through your skin-varies significantly from person to another. Especially the ones who have dark skin, hairy wrists, tattoo, and scar.
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Kaka0 said:
Amazfit admits that the heart rate monitor is "prone to inaccuracies" in its faq: https://support.amazfit.com/us/faq/839
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Oddly enough I have found the heart rate monitor to be remakably accurate if worn correctly and over the range 60-110. A few moments ago I confirmed previous results and while the watch showed 91 bpm a simultaneous ECG showed 90 bpm. The problem I have with the HR monitor is that it seems, when the cpu is stressed, to produce crazy results. To get around this I run exercise from the phone and get sensible results from the HR monitor. I might add that I was cooling down after exercise!
Well seems I am testing today. Had the watch about 2 days. I am guessing the watch does NOT show the current temperature? Like that matters. The GPS took about 45-60 seconds to connect, as others had. Seem to do faster NOT on wrist. Now my heart-rate monitor works really good. Tested it and I when I got 86 the watch got 85. did it again I got 84 thee watch got 85. Now I did take it off put it on the rubber mat and it kept going up to about 96 lol Put on my keyboard( light on top of keys) it went down to 40. Yet on my wrist works really good.
Hi to all,
I've had the Amazfit GTR 47mm for four months. From the beginning I have a problem with the pressure gauge and altimeter accuracy. The difference from the weather station values is from 40 to 90hPa and 50 to 200m.
I have a question, is there an application or procedure to calibrate a pressure sensor?
I'm sorry for my bad English
JT2020 said:
Hi to all,
I've had the Amazfit GTR 47mm for four months. From the beginning I have a problem with the pressure gauge and altimeter accuracy. The difference from the weather station values is from 40 to 90hPa and 50 to 200m.
I have a question, is there an application or procedure to calibrate a pressure sensor?
I'm sorry for my bad English
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Click to collapse
I have the same problem. Were you able to resolve this?