Today both the CTU and the FEDM were acting pretty flaky. I couldn't get the CTU to connect properly to the server so we set up the Tektronix as an input stub to the FEDM. Then the FEDM wasn't reliably doing the threshold comparison on the input, and the input node was sitting at the wrong level. Also the FEDM kept rebooting itself. David and I spent a long time fiddling around and doing various tests. Finally at one point David noticed a little fleck of metal sitting across two pins of one of the DACs. After getting rid of that (and actually even before then!), we no longer had the 10 ohm short of PMT_3 to +2.5VCC. However, we still had an unexplained 500 ohm short from there to ground. So, we went ahead and biased PMT_3 to GND and reintroduced the DAC#6 setting at +300 mV. Also, David noticed that the cooling plate wasn't seating properly on the metal block. Now we finally have a nice reliable input pulse, and no more resets, but still no output from stream_pulse_out_test. We'll have to finish debugging that next week.
Some goals for the coming months, from group meeting:
- By end of January, have timing sync datapath tested, debugged, and validated, and a complete set of all data (timing data plus pulse data from all 3 detectors) streaming to server. (Still at 200 MHz.)
- By end of February, have the LogicLock work finished, and 500 MHz data streaming to server. Also have the mechanical hardware substantially completed (for the midterm hardware demo).
- By April have all hardware ready to install in CLC (if not installed), and have the server software in pretty good shape at least - improvements to it can always be made later.
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