Hi all,
Looking for some assistance. We are seeing an high wattage spike with our power meter and we are having a difficult time tracking it down.
We are using the crank torque event based power profile. I have attached an excel spreadsheet with some data that we are seeing. It appears to be a random event and our power meter is not sending values greater than 2000 watts so I am confident that we are not transmitting the wattage value. I believe the issue is related to one of two possibilities; 1) is related to how the power display is calculating the average during a transmission failure, 2) or a zero cadence event. It may be that we are not handling a zero cadence event correctly or we are missing a use case.
From the excel spreadsheet there are 4 sets of data from separate tests that display the problem:
The first test takes place outdoors and is in normal operation. Test 1 data is a different case then the other 3 tests which are indoors and non standard operation (low to no torque on sensor).
The commonality between all of the tests though is the cadence and wattage values are repeated typically 2-3 times before the spike event occurs. A repeat event is typically related to a zero cadence event where the display is suppose to repeat the previous page if the event counter is not updated. This appears to hold true for test cases 2-4 where the cadence approaches the power meter minimum cadence of 30 RPM, at or below 30 RPM the power meter will transmit 0's for cadence and wattage and not update the event counter or accumulated values.
Cases such as test case 1 are occurring at random, we see them on some rides and not on others.
Cases such as test cases 2-4 we can repeat easily by riding with a trainer in a very high gear with no or low friction on the back wheel.
Also, we are using the Garmin Edge 500, multiple units.
If anyone has any ideas, or if you need more info please let me know, .
Best regards,
