With Takahashi-san.
Summary: we calibrated the BF Damper vertical LVDTs.
We calibrated the SF LVDT and the BF Damper vertical LVDTs. There was no known problem with the SF LVDT, only with the BF Damper ones. However, we also measured data to double-check the previously measured value (klog 19431).
The table below shows the new calibration factors that must be written in the medm screen. Comparison with the previous values from the medm screen is also shown. The new ones for the BF Damper are 1.86 times larger than the old ones.
| Device | calibration factor (cnt/mm) | New calibration factor for medm screen (um/cnt) | Old calibration factor in medm (um/cnt) | Ratio New/Old |
|---|---|---|---|---|
| SF | 3802.3 | 0.263 | 0.240 | 1.1 |
| BF V1 | 1204.7 | 0.830 | 0.460 | 1.8 |
| BF V2 | 842.65 | 1.187 | 0.704 | 1.7 |
| BF V3 | 951.84 | 1.051 | 0.495 | 2.1 |
I wrote in the medm screen the new values only for the BF Damper Vertical LVDTs. I kept the current value for the SF LVDT because the new value is close enough (within 10%) . I accepted the changes in the SDF (lines 7, 8 and 9 in screenshot).
