For COIL BALANCE for MC suspensions, I repeated her measrement all for the MC suspensions, and came to a strange conclusion.
Measurement conditions
- all Oplevs were centered before the measurement
- Oplev matrix are confirmed to be the same between the all three suspensions (which doesn't mean the all of them are correct).
- Oplev calibration factors [urad/cts] are off
- Applied offset on each coil +30000 cts
MCO
| Oplev P (cts) | Oplev Y (cts) | |
| H1 | +0.8 | +10 |
| H2 | +2 | -10 |
| H3 | -0.5 | -7 |
| H4 | -2 | +8 |
MCI
| Oplev P (cts) | Oplev Y (cts) | |
| H1 | -0.05 | -0.4 |
| H2 | +0.05 | -0.4 |
| H3 | +0.04 | +0.5 |
| H4 | -0.05 | +0.4 |
MCE
| Oplev P (cts) | Oplev Y (cts) | |
| H1 | +0.1 | +0.9 |
| H2 | -0.1 | +0.7 |
| H3 | +0.1 | +0.6 |
| H4 | +0.1 | -0.9 |
From the table, we can assume MCE's magnet sign of H1 or H3 is flipped. I cannot determine whether H1 or H3 by this measurement.
Presumably H1 is flipped, because so far -1 sign had been applied to H1 coil output filter.
Assuming MCE's H1 sign is flipped, PIT and YAW sign are opposite between MCE and MCO.
Assuming MCE's H1 sign is flipped, the actual coil configurations (coil assignments for the digital system) are all different.