I am seeing about a 50 watt difference from my CT to my SRM… Anyone else see this great of a disparity?
This is not a road to CT comparison. This is while using my SRM on the CT.
I am seeing about a 50 watt difference from my CT to my SRM… Anyone else see this great of a disparity?
Only when one or both are miscalibrated. If they’re calibrated correctly (and by that I do not mean just performing the coast down test for the CompuTrainer, or setting the zero offset for the SRM), they should agree to w/in a few percent (i.e., the amount of power consumed by the drivetrain).
I am assuming that my CT is not calibrated and my SRM is okay. Is there an easy way to confirm calibration other than the coast down or zero offset.
I am assuming that my CT is not calibrated and my SRM is okay. Is there an easy way to confirm calibration other than the coast down or zero offset.
I’m not sure that’s a safe assumption. Fortunately, however, you can calibrate your SRM yourself, and then use it to calibrate your CompuTrainer. You can do this by hanging weights of known mass from the cranks to determine the relationship between frequency and applied torque. Once you’ve confirmed/established the proper slope to use when calculating your power, you can compare steady-state power (i.e., 2+ min at various levels) as measured by the SRM against the CompuTrainer, and if necessary adjust the potentiometer that’s hidden behind a decal on the load generator. Of course, all the standard ‘rules’ with respect to setting the zero offset, warming up the CompuTrainer, etc., should be followed.
After further review it looks like User Error was the culprit… 
Ater doing the roll down calibration and hitting the zero offset again I am back within 5 watts or less…