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<blockquote data-quote="mag" data-source="post: 4124833" data-attributes="member: 47842"><p>Drammatico</p><p>Io non ho ancora visto nulla perchè il p2m è in viaggio ... Ma semplicemente drammatico</p><p></p><p>Il post piu interessante direi che è questo</p><p></p><p></p><p>I have looked in to this issue more with regards to the average power value. There are other related power problems that Garmin are working, but I will just address the average power issue here.</p><p></p><p>What Joe is seeing is being caused by a communication issue between his Edge and his power meter so other users may not see this.</p><p></p><p>One of the new features on the 510/810 is that it records the accumulated power value that is passed from the power meter to the Edge. This allows the Edge to keep track of the total power identified by the power meter even if it does not get all the individual message from the power meter.</p><p></p><p>The power averages on the Edge are being computed by using the accumulated power reported by the power meter and are thus a more accurate reflection of the work done.</p><p></p><p>Currently all the analytical tools out there are using the 1 second power values and not the accumulated power value. Im not sure how many of the tool vendors know about the accumulated power value in the FIT file.</p><p></p><p>If the communication drop between the power meter and the Edge is short then the Edge will back fill the missing 1 second values using the accumulated power data, but if the gap is too long it will record zero power for these 1 second entries.</p><p></p><p>If the communication drops are short and infrequent you will not see much difference between averaging the 1 second power and averaging the accumulated power.</p><p></p><p>In this case there were enough drops of sufficient length that the work difference between using the 1 second power values and the accumulate power values is around 9%.</p><p></p><p>In short the 188 average power for the Sunday ride is actually correct, but it is not fully accounted for in the 1 second power values due to communication drops.</p><p></p><p>I went back over the data from a number of my rides and the difference between the sum of the 1 second power values and the accumulated power is less than 0.4% and is often as low as 0.01% so something might be up with this power meter to give a difference of 9%.</p><p>Last edited by AWEATHERALL; 03-14-2013 at 02:48 PM.</p></blockquote><p></p>
[QUOTE="mag, post: 4124833, member: 47842"] Drammatico Io non ho ancora visto nulla perchè il p2m è in viaggio ... Ma semplicemente drammatico Il post piu interessante direi che è questo I have looked in to this issue more with regards to the average power value. There are other related power problems that Garmin are working, but I will just address the average power issue here. What Joe is seeing is being caused by a communication issue between his Edge and his power meter so other users may not see this. One of the new features on the 510/810 is that it records the accumulated power value that is passed from the power meter to the Edge. This allows the Edge to keep track of the total power identified by the power meter even if it does not get all the individual message from the power meter. The power averages on the Edge are being computed by using the accumulated power reported by the power meter and are thus a more accurate reflection of the work done. Currently all the analytical tools out there are using the 1 second power values and not the accumulated power value. Im not sure how many of the tool vendors know about the accumulated power value in the FIT file. If the communication drop between the power meter and the Edge is short then the Edge will back fill the missing 1 second values using the accumulated power data, but if the gap is too long it will record zero power for these 1 second entries. If the communication drops are short and infrequent you will not see much difference between averaging the 1 second power and averaging the accumulated power. In this case there were enough drops of sufficient length that the work difference between using the 1 second power values and the accumulate power values is around 9%. In short the 188 average power for the Sunday ride is actually correct, but it is not fully accounted for in the 1 second power values due to communication drops. I went back over the data from a number of my rides and the difference between the sum of the 1 second power values and the accumulated power is less than 0.4% and is often as low as 0.01% so something might be up with this power meter to give a difference of 9%. Last edited by AWEATHERALL; 03-14-2013 at 02:48 PM. [/QUOTE]
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