TEDf-VQWK-Testing

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We will log bad boards and upload plots and descriptions of problems to: https://misportal.jlab.org/mis/apps/peer/submit.cfm

• Run 1654 - testing a board to replace CH "vqwk1" "bad" board
  • Plots
  • It works, this board can be used - has label on top "MDBKG"
  • This board is then used to replace the board in CH "vqwk1" and Tao has taken data to establish pedestals
  • HAPLOG 3619 describes BPM 8 test with new ADC in CH crate
  • run 1233 and 1234 were used to test (run 1233 had address conflict, so ignore)
• Run 1655 - A board that was laying around, board 26
  • Plots
  • It works
• Run 1656 - testing original CH "vqwk1" "bad" board (top 4 channels are bad, ch's 4-7).
  • Plots
  • Top 4 channels are bad, as seen in CH crate data
• Run 1657 - test ADC 15, the one with the strangely wired and tied on Op Amp
  • Plots
  • Works
• Run 1658 - test ADC 37 - ISU board that has recently had new channels go bad on it
  • Plots
  • Bad channels 2, 3, 4
  • Channels 2 and 4 are highly non-linear, basically flat lines offset from pedestal
  • Channel 3 works only in positive voltage range
  • No Japan error codes are reported
• Run 1659 - test ADC 32 - used wrong HW address, no ACC light blinking and many VQWK read errors on telnet session
• Run 1660-1662 - test ADC 32 - corrected HW address (needs to be 0x8400)
  • Plots for first 6 channels tested
  • Plots for intermediate test run to remove VQWK read errors
  • Plots for post-reboot run with no signals at all (also no Japan error codes)
  • So it looks like all 8 channels are bad, and halfway through the run something broke even more
    • At about event 11000 vqwk read error messages started streaming on the telnet session after I plugged ramp DAC into channel 5 (6th on the board)
    • I started a new run to clear read error messages, that didn't fix, so I rebooted, and after rebooting the data is clear - no signal/analog output from ADC channels
  • I removed the board and marked it as dead
• Run 1663 - test ADC 33 - ISU backup board
  • Plots
  • All but channel 6 are bad
  • No error code - just bad channel responses
• Run 1664 - ADC 31 - bad
  • Plots
  • There are read errors for 1/3 events or so
  • All channels have crazy noise and no response to input voltage
  • Read errors get worse when plugging a signal into a channel
  • Some channels show differing response to input... characterizing problems will be a bit hard, so assume normal input stage problems? Or wiring to the later stages is bad across all channels?
• Run 1665 - ADC 31 - bad
  • Plots
  • Same ADC, same issues, rebooting VME crate didn't help
  • All 8 channels are bad, but some appear to have effects on their neighbors?
• Run 1666 - ADC 3 - a repaired board, previously tested in run 4642 in CH crate in November
  • Plots - old bad
  • Plots - new fixed, abridged plots (zoom x axis for ease of viewing)
  • Plots - new fixed
  • So Mark Taylor has fixed the board.
  • Here are plots comparing channel (indexed) 1, 2, and 3 old data with new
• Run 1667 - ADC 6
  • Plots
  • All channels look good

Status

Most spare boards have problems, but Mark Taylor can fix them