Neville – my comments on missed counts:
You said:
It is not necessary to check for occasional lost impulses with the Protege, because, except for the cases I mention below, they never occur.(All or no impulses are recorded.) One impulse is always lost in the following cases:
1. A ride of half a marathon without rezeroing.(Does not apply to the two-magnet method.) I stopped my bike when the count got to 9998, and gently rolled forward. Counting proceeded normally until 10,000 revolutions were recorded. Then the wheel rolled one revolution and a count was not recorded. On the next revolution counting resumed normally.
2. The wheel is stopped for five minutes and is started again without first waking the computer. I have noticed that if you do not “wake up” the counter a revolution will not be recorded the next time the magnet passes the sensor, thus will be “lost.”
3. Rezeroing is done with the wheel slightly ahead of the zero point. (Also does not apply to the two-magnet method.) When I rezero, I set the zero mark on the ground reference, then roll back a bit and rezero the counter. This arms the thing and subsequent operation – all the way to 9999 – is proper.
More comments:
I have found that the best way to learn about the Protégé 9.0 is to buy one and play with it. By rolling back and forth, and observing what happens, you will quickly learn how it works and gain confidence.
By the way – I originally had a Sigma Sport 600, with four magnets. It worked OK, but I did not like having to be alert about where I stopped, so as not to get a double-count if a magnet was close to the sensor. I bought a Protégé 9.0, set it at 9999, with one magnet.
Now I let the Protégé accumulate counts and use the Sigma Sport as a resettable counter for laying out splits. I record data only from the Protege. I never allow the Protégé to accumulate 9999 or more revolutions.
I like the electronic system and now use it.