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Difference between edge 500 and forerunner 310xt

I have both of these devices (bought the 500 first and picked up the forerunner with a gift card).  I like them both, but when I did my ftp test  yesterday the edge 500 gave me a normalized power over my 42 minutes of testing that was 3 watts higher than the 310.  Not much, but just wondering why it would be different.

Comments

  • There will be slight differences between units because sampling only occurs once every second. If one unit records half a second off of the other there may be slight variations in the power you are applying at that exact moment.

    There also may be some differences if one unit experiences some data dropouts.

  • Thanks - that makes perfect sense - I just never noticed it before
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