mainly location) complicating things – allows for sending data multiple times per second and SRM used to utilize this in both their power meters and head units, but recently they seem to have dialed back on this feature. The ANT+ power meter protocols – there are many depending on power meter type (i.e. Ideally one would combine separate and combined strain gauges and calibrate the three sensors continuously against each other. A combined meter that reports pseudo balance based on down- and upstroke cannot report the true balance but does not suffer from separate calibration on the other hand, a biased sensor for crank position could be, though less likely, a problem. A (cumulative) histogram of the power difference between two meter can also tell more about the meters than a time sequence comparison.Ī potential problem with left/right separate meters is that their left and right gauges cannot be calibrated against each other, so there may be a bias in the reported balance that goes unnoticed. If really a lot of the data points are far from the trend line, it’s probably not just a sync issue or a delay issue but really noise in the data of at least one of the compared meters. If all dots are very close to the trend line, both meters have high precision (i.e. If the line is more like a curve, you know that at least one of them is not really responding linearly to your power. Using a peak power graph doesn’t make a scientific comparison either – it will show how much a peak power graph will be off but not much more.Ī scatter plot graphing the output of one power meter against that of another is slightly more scientific as it makes spotting trends easier although you need to be aware of the fact that the sampling isn’t synchronized so the dots won’t line up perfectly – still how they distribute can give some hints about the behavior of each meter. If you draw a trend line for all dots and that line has an angle of 45 degrees, you know that both meters are accurate relative to each other. When comparing power meters, graphing them separately on a power vs time graph of averaged power only allows for rough visual checking, meaning that you’d notice only if it’s really far off – and it can be difficult to spot trends. If the “delay” is same for power in- and decreases it wouldn’t change the overall data, but often those characteristics differ and together with some built-in averaging short bursts can get swallowed. No manufacturer I know makes statements about the delay of its power meters and crit racers seem to complain when they accidentally switched to a power meter with more delay than their previous one. and isn’t comparable between manufacturers. This means that a statement like “within 2%” doesn’t say more than there was at least one testing condition under which it showed less than 2% error in comparison to some reference about which we don’t know much. I’ve written about this in some other posts already so I will spare the details here and just summarize: While most manufacturers make some accuracy claims about their products, there is currently no standard about how accuracy is measured. The first one now has been retired because of unexplainable spikes that appear only outside when going downhill, but on the way, I learned a few things that are not often mentioned. In the days since, I have tried five more power meters – a Pioneer, two Power2max (S and NG), Vector 2 and P1 – out of engineering interest. When I bought my first power meter – a Power2max, later renamed “classic” to distinguish from subsequent models – some four years ago, I mainly depended on DC Rainmaker’s blog to guide my choice. tak87 on Thoughts on choosing pedals, shoes and insoles. Karl Billeter on A few thoughts on choosing power meters.tak87 on A few thoughts on choosing power meters.Thomas Heller on Connect IQ app description: Live Peak Power Graph data field for Edge.tak87 on Connect IQ app description: Live Peak Power Graph data field for Edge.Using comparative statistics of cycling power to guide training directions.Connect IQ app description: Live Peak Power Graph data field for Edge.A few thoughts on choosing power meters.Thoughts on choosing pedals, shoes and insoles.What (I think) the Pioneer power meter tells me about my pedaling.Biometrics BSX Connect IQ Cycling Analytics Cyclo-Sphere Data analysis Data collection Garmin Garmin Connect HR KICKR LT Moxy P1 Pioneer Power2Max Power Meter PowerTap Recovery SGY-PM910H SmO2 Software SRM TrainerRoad Trainers TrainingPeaks TruTrainer Uncategorized Vector2 Verve Cycling WASP Websites 未分類 Search for: Recent Posts
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