Temp sensor BUG

msstefan 7 days ago

Around +5/6 degree difference
Can be software fixed?

Top Replies

US78 3 days ago in reply to sl91 +1

I've noticed this many times: the measured temperature is simply incorrect. Only after switching it on does the room temperature appear to be correct for a moment. During operation, the displayed temperature…
mcinner1 3 days ago in reply to US78 +1

The problem is that Garmin simply displays the sensor temperature as an unspecified temperature, which naturally leads one to assume that it is the ambient temperature.

However, the temperature sensor…
sl91 3 days ago in reply to mcinner1 +1

Yes of course ! The backlight can lead to some warming. This issue can also induce some security problems. In the winter time, I used the Edge 830 indicated temperature to know if I was going to face some…

All Replies

0 sl91 5 days ago

I have observed the same. The indicated by the 850 is almost 5 degrees above the right temperature. I have tested with and without a Garmin Tempe ant+ sensor. May be there is a design issue with the Edge 850. I mean its thermal sensot is may be too close to the main processor that can be warm/hot. Regards

0 US78 3 days ago in reply to sl91

I've noticed this many times: the measured temperature is simply incorrect. Only after switching it on does the room temperature appear to be correct for a moment. During operation, the displayed temperature is always approx. 3-5°C too high because the device warms up the sensor. This seems to be a classic design problem. It's a shame, because I need the temperature measurement a lot.

0 mcinner1 3 days ago in reply to US78

The problem is that Garmin simply displays the sensor temperature as an unspecified temperature, which naturally leads one to assume that it is the ambient temperature.

However, the temperature sensor is part of the barometer chipset and measures the temperature of the chip in order to correct the calculation of air pressure. That is its only purpose. And, of course, the ambient temperature of the baro chipset changes due to the CPU, but above all due to the use of the backlight.

So it is logical that no outside ambient temperature can be displayed, but Garmin does not mention this.

0 sl91 3 days ago in reply to US78

Hi US78,

My previous Edge 830 didn't have this issue at all. Indeed, it is really a shame. Regards

0 mcinner1 3 days ago in reply to sl91

My guess:

While the 830 works without (or with little) backlighting, the 850 requires a lot of backlighting due to its design. That's why the temperature is higher.

0 sl91 3 days ago in reply to mcinner1

Yes of course ! The backlight can lead to some warming. This issue can also induce some security problems. In the winter time, I used the Edge 830 indicated temperature to know if I was going to face some icing conditions. The indicated temperature was really reliable...

0 Doodle 2 days ago in reply to mcinner1

So why bother to allow a user to show the temperature in the first place? Knowing the temperature from part of the chipset is not particularly helpful when out for a ride.

0 US78 2 days ago in reply to sl91

YEs, My old Edge 830 and my wifes 530 are also correct...

0 sesulak 17 hours ago

Today was foggy and temperature difference was 4°C. So yes, it displays incorrect temperature.