FEB ID | Diode & Protection Res. Rework | Tested
w/ 4 Hybrids
FEB on Support Plate | Cleaned | Ready for Loading on Final FEB Support Plate | Comment |
|---|
1 | Yes | 12/10/2014 | | | Ben 12/15/14: "Board 1 wasn't getting a link when Omar tested last week. When I run on my desk with the test firmware it works fine. I recommend we flash the normal firmware back and try again." |
| 2 | No | - | - | - | FEB mezzanine Amtech connector has been replaced but the board does not have any rework done. Ben 12/15/14 - Rework is now done. Had incorrect resistor divider on 3.3V rail resulting in 4.8V output. May have damaged the FPGA. |
| 3 | No | - | - | - | Waiting to be reworked. Initial test have shown that only 19/20 APV's can be synced. |
| 4 | No | 12/10/14 results | - | - | Waiting to be reworked. Initial test have shown that, except for the edge channels, the noise on FEB CH 0-2 ranges from ~47-50 ADC counts. This is consistent with previous observations so these channels seem fine. There is a ripple in the noise present on FEB CH 03 and the noise across the whole hybrid is ~10 ADC counts higher than the rest of the channels. |
| 5 | Yes | 12/11/14 results | 12/11/14 | Yes | It looks fine. |
| 6 | Yes | 12/11/14 results | - | No | The baseline and noise of FEB CH 00 has issues. Most of the events had a baseline at ~6150 ADC counts and the noise was ~900 ADC counts. The behavior worsened in subsequent runs. Ben 12/15/14 - VREF level for CH 00 preamps was 1.8V instead of 1.25. This is now fixed. Board is awaiting retesting with the RCE.
|
| 7 | No | | | | Waiting to be reworked. |
| 8 | Yes | 12/11/14 results | 12/11/14 | Yes | This board looks fine. |
| 9 | ?Yes | - | | | No | Ben 12/15/14 - Had short on C743. Fixed now. Needs testing with RCE. |
| 10 | Yes | 12/11/14 results 1, results 2 | 12/11/14 | Yes | After power cycling? everything looks fine now. |
| 11 | Yes | 12/10/14 results 1, results 2 | | No | Again, overall the noise looks fine (~50 ADC counts) but there seems to be some samples that still have a large shift in the noise. Looking at the baseline distribution, there seems to be some large tails so that's probably the problem (ADC sampling point is off?). |
| 12 | Yes | 12/11/14 results | 12/11/14 | Yes | The baseline, once again, has tails but overall the noise looks fine on all FEB channels. The baseline and noise on FEB CH 1 and 3 have features similar to what we saw yesterday -- first sample noise is shifted by ~5-10 ADC counts. All other samples look fine. |
| 13 | Yes | 12/10/14 | | | A link to the FEB couldn't be established. Board 13 has some known issues on its D1.0V rail Ben 12/15/14 - Works on my desk. Seem to have intermittent problems. We should avoid using it in the system if we can.
|
| 14 | Yes | 12/10/14 results | 12/11/14 | Yes | Looks fine. |
| 15 | Yes | 12/10/14 results | 12/11/14 | Yes | Baseline has tails and the shifts in the noise are present on the same APV's as before (on CH 1) but otherwise it looks fine. |
/EPP