This is the setpoint of GAS filters for DC controls.
[count]
| IX | EX | |
| F0 | -11600 | -8500 |
| F1 | 7800 | -12500 |
| F2 | 2300 | X |
| F3 | 3500 | 12600 |
| BF | 2900 | 8500 |
I tried to offload the GAS_LVDT value for all stages of ITMX. but some stages (F0, F2, F3) are not offloaded.
| Target(klog#17715) | Today | Memo | |
| F0 | -11600 | -14600 | No. I could not move anymore because the limit switch was touched. |
| F1 | 7800 | 7600 | OK! |
| F2 | 2300 | 2900 | No. I could not because keystone may be touched some where around 2600. |
| F3 | 3500 | 4000 | No. Stepper motor could not move the fishing rod. |
| BF | 2900 | 2900 | OK! |
I will try it with Ikeda-san, and try ETMX after ITMX.
[Takahashi, Sato, (remote) Ikeda]
We tyied to adjust the filter height for F0, F2, and F3.
F0: We found mismatching between the FR range and the keystone range. The ballasts (0.44kg x2) were added onto the F0. The FR range was measured and the limit switches were reset along the range. Relation between the FR height and the keystone height has hysteresis, so one ballast (0.44kg) was removed to set the keystone height to the setpoint.
F2: The keystone height passed through the setpoint once, but the keystone has reached upper mechanical limit. After that the FR didn't work at all.
F3: The keystone height was set to the setpoint using the stand alone driver.
[Takahashi, Sato]
We adjusted the filter height to the setpoint in EX. Detail of the FR operations will be reported later.
[Takahashi, Sato]
This is detail of the FR operations in EX yesterday.
(Log on 8/16)
[Takahashi, Sato]
We checked the F2 FR.
- The relation between the step in FR and the LVDT signal was revised. The sign of step was wrong in the last time.
- Put a small weight (~30g) on the BF cup. The F2 keystone was released from the upper limit (from -980 to -100 in LVDT count).
- Moved the stepper motor by -25600 step. The keystone could go down from -100 to +960.
- Removed the small weight. The keystone went up from +960 to +260, but it was still free.
I revised the setpoints in IX along the new height setting.
| LVDT count | comment | |
| F0 | 15600 | near upper limit |
| F1 | 6750 | mid point |
| F2 | 6100 | lower point |
| F3 | 3000 | higher point |
| BF | 4100 | mid point |
I revised the setpoints in EX owing to the recalibration of F0.
| LVDT count | |
| F0 | 4520 |
| F1 | -12500 |
| F2 | X |
| F3 | 12600 |
| BF | 8500 |
This is a present summary of the setpoints in count and um.
| IX | count | um | EX | count | um | |
| F0 | 15600 | 4362 | F0 | 4520 | -1782 | |
| F1 | 6750 | -1215 | F1 | -12500 | 2791 | |
| F2 | 6100 | -1327 | F2 | X | X | |
| F3 | 3000 | 623 | F3 | 12600 | -2831 | |
| BF | 4100 | -1197 | BF | 8500 | 1730 |
According to the calibration factor in klog18909, there still seems to be some discrepancies between LVDT count and setpoint.
For example, IX F0 LVDT setpoint in the unit of cnts are 15600 according to klog18898.
This value is corresponding to 15600*0.280=4368 um (0.280 is coming from the calibration factor which is posted in klog18909).
However, your summary says F0 LVDT setpoint is 4362 um.
Of course, this discrepancy is negligible in practical application but I would like to confirm what is the origin of the discrepancy to make sure there is no misunderstanding each other.
I updated the summary of the setpoints for the GAS filters.
| IX | count | um | EX | count | um | |
| F0 | 15600 | 4362 | F0 | -1500 | 591 | |
| F1 | 6750 | -1215 | F1 | -12500 | 2791 | |
| F2 | 6100 | -1327 | F2 | X | X | |
| F3 | 3000 | 623 | F3 | 13700 | -3078 | |
| BF | 4100 | -1197 | BF | 8500 | 1730 |