Force Sensor Calibration — 4 lb Spring Test
Digipot 159
Sterilization: heat to 55°C for 24 hrs
5-point cal
Linear fit
All
None
Pre-steril measured
Pre 5-pt line
Pre 5-pt ideal pts
Pre 0+8.88 line
Pre 0+8.88 ideal pts
Post 0 & 4 lb measured
Post 0+4 line
Post 0+4 ideal pts
Post 0+8.9 line
Post 0+8.9 ideal pts
Post-steril measured
Post 5-pt line
Post 5-pt ideal pts
Projection error at ~49 lb vs actual measured
| Model | Projected (mv) | Actual measured (mv) | Error (mv) | Error (lb equiv.) |
|---|
| Pre 5-pt @ 49.44 lb | 2264.1 | 2236 | +28.1 | +1.1 |
| Pre 0+8.88 @ 49.44 lb | 2040.3 | 2236 | −195.7 | −7.5 |
| Post 5-pt @ 49.35 lb | 2381.6 | 2340 | +41.6 | +1.5 |
| Post 0+4 @ 49.35 lb | 2474.0 | 2340 | +134.0 (+5.73%) | +4.9 |
| Post 0+8.9 @ 49.35 lb | 2479.0 | 2340 | +139.0 (+5.94%) | +5.0 |
Ideal decade forces by model
| Force (lb) |
Pre 5-pt |
Pre 0+8.88 |
Post 0+4 |
Post 0+8.9 |
Post 5-pt |
All measured forces — measured vs estimated
| Force (lb) |
Pre 5-pt |
Pre 0+8.88 |
Post 0+4 |
Post 0+8.9 |
Post 5-pt |
Italic values are model estimates. Normal weight values are direct measurements. 0 and 4 lb pre/post values are means of repeated readings.