Heart Rate Measurement stops

Matúš

@misu763 said:
Could it be the strap fastening? When it’s hot, I wear it looser, and that’s why I’m having doubts.

I’ve just tried and it seems that the optical sensor switches off at about 15-20mm from the skin, but I doubt that you are wearing the watch so loose, plus I think that the HR sampling is pretty unreliable in this condition.

misu763

@Matúš I just thought that perhaps the intermittent contact with the skin could cause the sensor to go haywire, causing the monitoring to block… but I’m not sure that’s a valid hypothesis…

PetervdMeer

@Matúš My hypothesis is that there are some extra features that do not really work well together.

Test 1: new battery installed because watch could not last for more than two days which is somewhat below specs. Before battery switch the sleep tracking was unstable, after the change it never came back.
Test 2: turned of heart-rate measurement completely since it is no use … Surprise it is still trying to ignite the measurement LEDs ???

Restarted it several times, being more than a week since I received it back.
Multiple trainings done, they worked out OK and battery time seems to have improved since I can use the watch more than two days on a charge now.

However it is entirely unlike the other Spartan Sport WHR I own which can be worn a week and still has 80% of battery power. Both have new battery but remarkably different performance, sleep recording broke something in the 9PP as far as I can deduce.

Tamás Tompa

Same issue here since I bought my Peak Pro watch some month ago. Running on Version 2.50.28, after some days it just stop measuring HR, very annoying, then I need to reboot. Please fix this.

jussim

@Tamás-Tompa Don’t you just hate it how you notice it stopping only a day after or so in the morning and you end up missing sleep data

Ádám Patkós

@jussim It’s been like this for months. I downgraded the firmware to the previous version. The heart rate measurement only stops every two weeks. Suunto doesn’t deal with it. They probably know about the bug. I’d like you to buy a new Suunto with a new bug.

jussim

It’s weird how you can try to pre-emptively reboot your watch every once in a while in hopes to prevent this but there’s just no rhyme or reason to it, HR measurement can still stop just like that.

Tamás Tompa

@jussim Yes, it’s very annoying. Hopefully Suunto will rank up this issue!

Matúš

@Tamás-Tompa, it wasn’t done in past years, I really doubt that they’ll do something now.

Mateusz Dąbek

Hi,
I have a strange HR measurement issue with my Suunto 9 Peak Pro. I use latest FW version 2.50.28

During continuous cycling, the optical heart rate measurement works perfectly fine. However, after I stop for a short break (around 2–3 minutes), the HR reading becomes completely inaccurate when I start cycling again.

For example:

Before the stop: watch shows 130–150 bpm, which matches my chest strap.
I stop for 2–3 minutes.
After I start cycling again: the watch may show 50–80 bpm, even though my actual HR is still around 130–150 bpm.
The incorrect reading can continue for many many kilometres.

I have confirmed this using a chest strap, so it is definitely not my actual heart rate.

Interestingly, the green optical sensor LEDs remain active, so the sensor does not appear to be completely switched off.

It happens when I recording activity as cycling as well as I am not recording an activity during these rides, simply use the HR display on the watch face.

Has anyone experienced the same issue? Is there a known problem with the OHR sensor/firmware after a period of inactivity or standing still?