oli.patane@LIGO.ORG - posted 14:21, Monday 31 August 2026 (91609)
Rest of test results for HAM-A ECR E2400048 chassis
Jackie, Oli
Jackie finished retesting the modified HAM-A coil driver chassis that had failed (91418), and they all pass now. Four of the chassis (S1200608, S1201155, S1201162, and S1201165) have the C6 and C20 capacitors as 2.2nF instead of their nominal values, which explains why they deviate from the ideal model at higher frequencies.
| S/N | Latest date tested | Output Impedance (kOhm) | SUS Stage OSEMs | Rack - Height | OSEM Type | Looking good? | Results saved? | Comments |
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Installed for BHD
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| S2001178 | 2026-08-18 | 1p2 | AM2 M1 | SUS-M2, U34 | BOSEM | 2026/08/18: Looking good; 2026/02/02: maybe? CH4 bad above 3000Hz |
y | Capacitors are nominal |
| S1200608 | 2026-08-18 | 1p2 | OMA2 M1 | SUS-M2, U24 | BOSEM | 2026/08/18: Looking good; 2026/02/09: ?? CH1-4 bad above 3000Hz |
y | *** |
| S1201155 | 2026-08-18 | 1p2 | OMB2 M1 | SUS-M2, U23 | BOSEM | 2026/08/18: Looking good; 2026/02/02: CH1-4 bad above 3000Hz |
y | *** |
| S1201162 | 2026-08-18 | 1p2 | OMA3 M1 | SUS-M2, U21 | BOSEM | 2026/08/18: Looking good; 2026/02/09: ?? CH1-4 bad above 3000Hz |
y | *** |
| S1201165 | 2026-08-18 | 1p2 | OMB3 M1 | SUS-M2, U19 | BOSEM | 2026/08/18: Looking good; 2026/02/02: CH1-4 bad above 3000Hz |
y | *** |
Non-image files attached to this report
