Suunto HR Belt unreliable with 9 Peak Pro since firmware update - anyone can confirm?

Brad_Olwin

@Pyranya Here is the example from my run, a 20 min walk today was fine as well. V2 and S9PP paired to SHRM2

Walk with Run 2 OHR and S9PP with SmartSensor, these don’t match as well as I would have expected.

Pyranya

I’m not sure, but you can see from the graph that there’s a regular drop in heart rate at that point. It seems to me that this happens every time the connection is lost.

During this run, I made sure to maintain a consistent pace throughout. The first 5 minutes and the last 5 minutes were slower than the 20 minutes in between.

greez

isazi

@Pyranya have you checked the R-R plot of your heart rate data? The strap may be not working anymore, and that is not fixed by changing a battery.

Pyranya

@isazi

Where do I find the R-R plot of my HR data?

greez

isazi

@Pyranya it is not in Suunto App. Export your file to an external service, such as Runalyze or quantified-self.io and check it there. If it is very noisy, then there is some issue with your strap.

Pyranya

@isazi

Used Runalyze:

It seems to look very noisy.

greez

sartoric

@Pyranya
indeed

it looks ok at the beginning, then it goes bananas
What’s that sample duration ?

Pyranya

@sartoric

Duration for the run was 30min.

greez

Pyranya

I’m going to test the HR Belt with a different phone and a different app and then see what the results look like.

greez

Swaddy61

@Brad_Olwin It seems to me there are some pretty big (like huge) HR spikes on the V2. I am not sure I am understanding what you have written. Are both the V2 and the S9PP paired to the HRM2 at the same time? If so, why are there big spikes on one, and why don’t the traces match exactly?

Brad_Olwin

@Swaddy61 said:

@Brad_Olwin It seems to me there are some pretty big (like huge) HR spikes on the V2. I am not sure I am understanding what you have written. Are both the V2 and the S9PP paired to the HRM2 at the same time? If so, why are there big spikes on one, and why don’t the traces match exactly?

Yes, both connected to the same SHRM2, it could be that the V2 was not receiving the signal as well. The V2 is on field test firmware and that could be an issue. I would not pay much attention to it.

Brad_Olwin

@Pyranya said:

I’m going to test the HR Belt with a different phone and a different app and then see what the results look like.

greez

The data look bad on Runalyze, it is most likely the strap. Depending on smoothing with whatever device you test it may be ok but not for the 9PP or any other Suunto watch. I have had this issue as well when my straps wear out. The SmartSensor straps last between 6 months to 1 year for me.

Pyranya

@Brad_Olwin

So the sensor may be fine?

greez

sartoric

@Pyranya usually yes

Pyranya

@sartoric

Thank you

Brad_Olwin

@Pyranya said:

@Brad_Olwin

So the sensor may be fine?

greez

Yes, my sensors last forever, still using one from Ambit 3 Peak

Pyranya

@Brad_Olwin

I bought a new HR belt (without a sensor) and tested it with my old sensor today. The problem persists:

The connection to the sensor is constantly being lost and re-established after a few seconds.

Is it possible to reset the sensor? Apart from removing the battery for a few seconds?
Is it possible to buy the sensor cheaply (at Movesense, the sensor on its own is more expensive than at Suunto with the heart rate belt)?

greez

Pyranya

So I reset the sensor and disconnected it from the watch. Then I reconnected it to the watch and restarted the watch. After that, I did a test run. During those 5 minutes, the connection wasn’t interrupted or lost even once.

I’ll test it again tomorrow – I’m running a half-marathon then.

MarTej_cz

Honestly, I don’t think the HRM is wet from the activity or the body.

Pyranya

I just ran the race and didn’t have any problems at all with the new heart rate belt or the sensor. It seems that resetting the sensor helped.
I’m also going to test my old heart rate belt with the sensor just to see if it might have something to do with the old belt.

greez