Tools · SciSpinner Max
Set the frame and core speeds and watch what a motion sensor module in the core would read, and how far the time-averaged gravity falls over 2 minutes, 15 minutes and an hour. Everything is calculated in your browser.
0.050–5.000 rpm per axis in 0.001 rpm steps; 0 holds the axis still. Direction is as seen from the axis's motor end.
Run time 00:00:00. Changing a speed or direction starts a new run.
| Time-averaged gravity | ⟨g⟩ |
|---|---|
| 2 min | — |
| 15 min | — |
| 1 h | — |
| Whole run | — |
| Sphere coverage | — |
Readings in g. Windows are trailing and computed from one-second means, as on the instrument's Gravity tab.
Gravity direction in the sensor frame, as seen looking down each axis end: front hemisphere (+z) and back hemisphere (−z). Shaded cells have been visited at least once (288 equal-area cells); the line is the last 30 s of run time and the dot is now.
Last 60 s of run time.
15 min and 1 h trailing windows, log scale. Dashed line: 10⁻³ g.
The sample frame turns with the core, which turns inside the frame. With frame speed ωo and core speed ωi, a sensor at the centre reads the gravity direction g = (sin ωot · cos ωit, sin ωot · sin ωit, cos ωot), Clary et al. (2022) Eq. 1, the same kinematic model the g-level analysis tool compares runs against. The sensor is sampled at 20 Hz; ⟨g⟩ is the magnitude of the mean of one-second means over each trailing window, the instrument's own calculation. A real run adds the sensor's small zero-g offset, which the instrument and the analysis tool measure and remove. Coverage counts 288 equal-area cells of the unit sphere (12 bands in sin(latitude) × 24 in longitude) visited by the gravity direction.