DAQ Testing/20180730

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July 30th, 2018 Testers: Cameron and Chandan

See Today's Meeting Notes

Goals

Figure out why the last few ADCs in the Counting House crate are giving strange signals

• Was it user error, plugging channels in the wrong places? - some was, still crosstalks on same board
• Are the neighboring channels experiencing cross talk? - yes, investigate more after lunch
• Are the neighboring channels hard wired in a strange way? - maybe, may be software instead
• Is the neighboring board (4) connected via VME backplane (to 3)? - no, probably just user error - note this in prior day run logs
• Is this intentional? - Caryn had set the vqwk# initialization in the boot script instead of the .crl file... - no, why would you sabotage your ADCs like this?

Test a backup QWeak ADC to see if the crosstalk/mislabeled ADC channels are hardware or software

• Replace vqwk3 with replacement and do dedicated runs for each channel and compare all signals

Testing ADCs

• Testing Qweak ADCs to understand strange channel mapping and crosstalk
  • vqwk3 (board 4) - channel 0 - run 4107 -
    • Signal shows up in channels 0 and 1, channel 0 is 0.25 times the signal in channel 1
    • Neighboring vqwk4 doesn't see any crosstalk from vqwk3 - so that was some user error
  • vqwk3 (board 4) - channel 1 - run 4108 -
    • Signal shows up in channels 2 and 3, channel 3 is 0.25 times the signal in channel 2
    • The first 4 channels are doubled, top 5 channels are dead
• After Lunch: Take all wires out and test the board (vqwk3) with no extra signals in it - to see if the cross-talk/multiplied channel problem is hardware or software
  • Run 4109 has all extra signal wires unplugged, replaced the EXT Gate trigger wire, plugged
    • Run 4109 - 0-1200 events - Ramp in channel 0 (expect signal in 0 and 1 if error persists)
    • Run 4109 - 1200-2600 events - Ramp in channel 1 (expect signal in 2 and 3 if error persists)
    • Problem persists - channels are coupled strangely still
• Replace QWeak ADC in 4th sloth (index 0, vqwk3) with a replacement board to see if it was a hardware or software problem
  • The old vqwk3 board has a strange device attached to it (see image - left is old, right is replacement)
  • Run 4110 has new board
    • Run 4110 - 1200 events - Ramp in channel 0 (expect signal in 0 and 1 if error persists in VME crate or software)
      • Error persists, channel 0 input still affects 0 and 1
    • Run 4110 - 1200 events - Ramp in channel 0 (expect signal in 0 and 1 if error persists in VME crate or software)
    • Run 4112 - Ramp in channel 1 (expect signal in 2 and 3 if error persists in VME crate or software)