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CT Calibration Acting Up--Thoughts?

Linda PatchLinda Patch
in General Training Discussions

Hi--

Before I get into a back-and-forth with the Computrainer people, I thought I'd ask here...

For the past 2 weeks, the calibration on my CT has been acting up. Get on, ride a little, calibrate. Finish warm-up, calibrate again before the MS. Then, in the middle of the interval, the calibration goes kerflooey. I know because pedaling suddenly gets super easy, and it's clear something is wrong. I check the calibration again, and it's at 9.54-ish. Re calibrate and it goes back to the proper 2.5-ish. Sometimes the calibration stays solid for the entire workout (or after a recalibration mid-workout), and sometimes this happens 3-4x, which is incredibly annoying.

Checked all the cables, and everything is plugged in properly. Anyone know what this is, and what to do about it? I hope I don't have to send it off for repair on the eve of the Jan OS.

TIA!

 

Comments

  • arzaskearzaske
    Hmmm... Just got my CT this year, so very far from an expert here, but that sounds pretty not right. If you are saving your results after a full calibration process (8-10min warm-up and then the whole pedal to above 25mph and coast thing...repeated until you get 3 similar values...and then save) and then checking the callibration later and it is dramatically different (which 9.5 lbs to 2.5 lbs certainly seems to be!) yet then reverts, then it would seem to stand to reason that you've got a mechanical problem...perhaps there is an other explanation, but it seems unlikely... sorry, what a pain!
  • Linda PatchLinda Patch
    Posted By Art Zaske on 16 Dec 2010 11:44 AM

    full calibration process (8-10min warm-up and then the whole pedal to above 25mph and coast thing...repeated until you get 3 similar values...and then save) and then checking the callibration later and it is dramatically different (which 9.5 lbs to 2.5 lbs certainly seems to be!)

     

    Hi Art--thanks for manking that clear. Yes, I do exactly that for calibration.

  • manconamancona
    I doubt this is the same issue, but last year I noticed that through a workout the resistance was getting less and less even though I calibrated correctly. The calibration value was stored fine and if I re-calibraed it would be fine again for a bit. Ended up I had a slow leaking inner tube and as it lost air my intervals got easier.

    IIRC, Over an hour the tire lost about 30 or so PSI and it made a a very noticable difference in effort.

    It sounds like your issue is more related to the CT itself but it may make sense to check your tire pressure before and after just to make sure.
  • TundraCatTundraCat
    I had a calibration issue come up last week where everytime I calibrated it would show 99.99. A search on the racermate forums pointed to either the load generator or a bad DIN cable. Lucky for me it was the DIN cable as I was able to calibrate with someone else. If you know someone else with a DIN cable, it might be worth it to swap them out and see what happens.


  • gilliattgilliatt
    Agreed, Linda try the cable, I had one that I had stepped on a good number of times with bike cleats, it had a short in it. Hopefully it is the cable and not the load generator. They are 10 bucks on the CT site. Good luck and report back
  • Al TruscottAl Truscott
    Linda, the same thing happened to me a year ago, along with dropping HR and cadence readings. I had to get it back to Racermate for some new hardware, $250. No shipping for me cause Im in driving distance from them
  • Linda PatchLinda Patch

    Thank you so much, everyone. Cable check to start. I knew it would be days to get a reply from Racermate, so thanks for giving me a head start. DH will be put on the cable case this evening! image

  • Jeff BraatenJeff Braaten
    Totally agree, I have had this happen twice and it was the DIN cable both times.
  • Trent ProughTrent Prough
    Linda.. same issue for me at the start of my OS this year and yes what a pain. What many others have said mine also was the DIN cable. I'd start there too.
  • Linda PatchLinda Patch

    Hi All,

    We tracked down the problem, and I thought I'd put it up here as another piece of info to keep in mind should this kind of thing happen to you (or to you *again in some cases image).

    DIN cable was fine. Swapped with my DHs CT--same problem.

    Swapped head units--same problem.

    My husband then unplugged the power supply cable and there was corrosion there. A little sand paper action, and it's working as good as new.

    I'm just glad I didn't have to send it off for repair. Thanks again for all your help!

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