For common issues, check below. You may also reference the User Guide here or in the app. If you need additional help, please contact me at support@briffidi.com.
SW1 Common Issues
After calibration, the calibration rod measures correctly, but the measurements of my racquets are way too high. With the new, extendable calibration rod, I’ve received a couple such reports. This can be caused by calibrating with the rod partially extended. It should have four internal sections exposed and should be a bit longer than a racquet (29″ or 74 cm). For example, if only three sections are exposed, the swingweight of the rod is somewhere around 165 kg·cm², but after calibration, the app “thinks” it is ~300 kg·cm² (the larger value on the rod label). A typical racquet will then measure 500-650 kg·cm².
When calibrating, the “Periods: 2 [greater or less] than 1 and 3” check isn’t satisfied. You probably measured the calibration rod in the wrong order. For the extendable rod, the first and third measurement groups should be of the collapsed rod, and the second measurement group should be of the extended rod. For the rod with removable weight, the first and third measurement groups should be of the bare rod, and the second measurement group should be of the rod with weight.
TWA Common Issues
When oscillating a racket, the handle wobbles, or measurements vary a lot with small adjustments to the centering of the racquet. If the racquet is secure in the TWA, these issues both indicate that the racquet is not centered. Start by lining up the racquet with the center indicator of the TWA centered between the two center main strings, but you may need to tweak it slightly. When centered, the measurement will be at a minimum, and it will increase slightly as you move the racquet in either direction. I see this issue with one of my racquets, and it appears that the drill registration is slightly off. Note the location of the center dot relative to the strings of the top racquet in the photo below.
