With Washimi-san.
This entry supersedes previous entries.
I realized that some of the information given to us (JGW-T1604798, Feb 2016) about how to set up the card ready for calibration was wrong. Namely, in order to set the phase, it is instructed to use the wrong probe points.
The signals, whose relative phase must be set before calibration and measured for LVDT card replacement, must be sampled from points P_{i} and G_{i} with i = 0,...3, where former is the reference signal and the latter is the signal coming from the LVDT secondary.
PR2
- In the phase measurement the signal at probe point G_{i} goes ahead of the reference signal P_{i}.
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We measured the amplitude of the reference signal directly from the signal generator using the oscilloscope: it was 5.87 Vpp with nominal value 6 Vpp (repored already in 15376) at 10 kHz.
| LVDT | Input gain resistance (kOhm) | Output gain resistance (Ohm) | Phase (µs) | Board and probe points index |
| BF GAS | 5.282 | 39.1 | 10.1 | Left, 0. |
| SF GAS | 5.350 | 38.6 | 51.4 | Left, 1. |
| Not used | 5.330 | 100.2 | Not used | Left, 2. |
| Not used | 5.304 | 99.8 | Not used | Left, 3. |
| BF-V1 | 5.441 | 26.2 | 56.4 | Right, 0. |
| BF-V2 | 5.533 | 26.1 | 10.0 | Right, 1. |
| BF-V3 | 5.262 | 29.3 | 7.3 | Right, 2. |
| Not used | 4.032 | 101.5 | Not used | Right, 3. |
- Chassis number: S1403050 in PR2 rack.
- Phases measured on 10-11-2020 after Shimode-san fixed a minor problem with the driver.
- Data on page 12 in Fabian's notebook.
| LVDT | Input gain resistance (kOhm) | Output gain resistance (Ohm) | Phase (µs) | Board and probe points index |
| BF-H1 | 5.219 | 29.9 | 57.6 | Right, 0. |
| BF-H2 | 5.390 | 29.6 | 57.7 | Right, 1. |
| BF-H3 | 5.535 | 28.5 | 8.8 | Right, 2. |
| Not used | 5.304 | 94.5 | Not used | Right, 3. |
- Chassis number: S1403047.
- Note for Fabian: this information is on page 13 in the notebook.
PR3
The amplitude produced by the signal generator should still be measured with the oscilloscope. The nominal value is 7 Vpp at 10 kHz.
| LVDT | Input gain resistance (kOhm) | Output gain resistance (Ohm) | Phase (µs) | Board and probe points index |
| BF-V1 | 5.721 | 79.6 | 7.3 | Left, 0. |
| BF-V2 | 5.534 | 81.6 | 58.1 | Left, 1. |
| BF-V3 | 5.791 | 76.7 | 7.9 | Left, 2. |
| Not used | 5.675 | 88.3 | --- | Left, 3. |
| BF-H1 | 5.442 | 89.3 | 57.7 | Right, 0. |
| BF-H2 | 5.438 | 98.5 | 12.0 | Right, 1. |
| BF-H3 | 5.422 | 88.2 | 13.2 | Right, 2. |
| Not used | 5.671 | 98.5 | --- | Right, 3. |
- Chassis number: I forgot to check, in PR3 rack.
- Note for Fabian: this information is on page 15 in the notebook.
| LVDT | Input gain resistance (kOhm) | Output gain resistance (Ohm) | Phase (µs) | Board and probe points index |
| BF GAS | 5.374 | 82.9 | 20.3 | Right, 0. |
| SF GAS | 5.144 | 84.5 | 17.4 | Right, 1. |
| Not used | 5.595 | 83.0 | Not used | Right, 2. |
| Not used | 5.512 | 84.3 | Not used | Right, 3. |
- Chassis number: S1403131, in PR3 rack, the driver is shared with PRM.
- Note for Fabian: this information is on page 15 in the notebook.
PRM
- The settings for the driver for the BF recoil mass LVDTs was not measured because a problem with how some cables are connected. Once that's fixed I'll go back to it.
- The signal generator is shared with PR3.
| LVDT | Input gain resistance (kOhm) | Output gain resistance (Ohm) | Phase (µs) | Board and probe points index |
| BF GAS | 5.371 | 124 | 9.4 | Left, 0. |
| Not used | 5.258 | 1.1 | Not used | Left, 1. |
| SF GAS | 1.2 Ohm | 86.7 | 19.7 | Left, 2. |
| Not used | 5.010 | 100.4 | Not used | Left, 3. |
- The driver is is shared with PR3 and is in PR3 rack: S1403131.
- The input gain resistence in SF GAS channel looks anomalous. It's value is 1.2 Ohms whereas typical values are larger then 5 kOhm.