Qalvin is Quarq's application for iPod Touch, iPhone and iPad that enables calibration and advanced diagnostics of CinQo powermeters.
The Qalvin manual goes through each of Qalvin's functions one-by-one and contains troubleshooting information. The manual is in high resolution - zoom in to see the screen shots.
Qalvin User Manual v1.4 (PDF, 1.3MB)
Video: Calibrating Your Powermeter
Qalvin enables you to calibrate your powermeter’s slope by hanging weights from the bike’s cranks. This video explains what weights to use and how to set up the bike, and goes through the calibration process end-to-end.
The weight used in the video is McMaster-Carr's 20kg Grip-Handle Test Weight. Part # 1788T26. These come with a certificate of accuracy to +/- 2g.
Can I run Qalvin without the Wahoo Key?
Can I use a Digifit Connect ANT+ sensor with Qalvin?
Can I use a Garmin ANT+ sensor with Qalvin?
Will Qalvin work with 1st Generation CinQo powermeters (not the CinQo Saturn)?
Why does the Adjust Slope function make inconsistent changes, particularly when reducing the slope?
When using Advanced Diagnostics, I stopped rotating the crank and a reed switch in the Reed States box stayed as 1. Does that mean a reed switch is stuck on?
What is raw torque?
I want to swap between two sets of rings, road and TT. How can I use Qalvin to do that?
There are three ways to adjust the calibration of the CinQo in Qalvin.
- Adjust the slope.
- Enter a known Slope value.
- Carry out a complete calibration, with a standardized weight.
How can one determine what the difference in slope is between two different sets of rings?
Where can I purchase the weight and hook seen on the video?
The weight used in the video is a 20kg Grip-Handle Test Weight, Part Number 1788T26 from MCMaster-Carr.
The hook specifically designed for the weight, stays upright when not engaged on the pedal, with a polished powder coat finish, can be purchased from Quarq for $5.
Can you please step through what Jim says in the video about weights?
The reference weight should have 10 times the precision of what you're measuring. If you want +/- 2% accuracy in your CinQo, you want +/- 0.2% accuracy in your reference weight.
We did the following tests prior to creating the video:
- Took a 20lb reference weight to UPS. It weighed 19.95lb, which is 0.2% accuracy. You could therefore use UPS (the one in Spearfish, SD, anyway) to check your weight.
- Took a 20lb reference weight to USPS. It weighed 19lb 15.8oz, which is 0.06% accuracy. In this case USPS is an ever better choice.
- Took a department store 50lb dumbbell to both places and found it weighed 51.05lb at UPS and 51lb 1.2oz at USPS.
You must check your weight. If it is not a calibrated test weight, the USPS scales will give you better than the desired level of accuracy.