If changes consist of corrections to the schematic, and no changes to the copper, then the version will change to 5.n.
If changes involve modifications to the circuit topology, then the version will change to 6.0.
What's new in Rev 5.0: Significant changes from Rev 4 to Rev 5.0
What's new in Rev 5.1: well... not much. Solder terminals and the test connector have been moved.
Trigger Comparator Input Signal Study
fADC shaping amplifer Study
DOM MB i-v curve Study
Common Clock Study i.e. supplying coherent clock signals to DOR card and DOM MB
DOM Gain presentation
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Rev 5.1 PowerPoint figures
Lighter is warmer. The orange block on the right hand side is a reference temperature source.
Reflective objects may appear to be colder than they actually are because they reflect the surrounding temperature.
The image was taken roughly 40 minutes after the power was turned on.
The first small production run consisted of contract fabrication with debugging done by LBNL. HASS testing, was done by an outside contractor; burn-in and integration testing were done at LBNL. Orders were based on an expected yield of 80% without rework. Rework was required to raise the yield above ~60%, and ultimately resulted in a yield of ~95%.
A few late corrections, and changes were deemed sufficient, and safe enough to warrent a minor redesign of the DOM MB. (See the revision list for details) The result was V5.1
The second year production involved splitting the work between two vendors as part of the ramping up of output. The first half of the production duplicated the first year paradigm. The second half of production used a single vendor contract manufacturer which built, debug, ran HASS test, and burn in boards with LBNL supplementing debugging.
The third year production was done by single vendor contract manufacture, chosen by competitive bid. Unlike previous years, the contractor committed procuring all components (except a few that LBNL made lifetime buys on), and to only deliver good boards. The manufacturer achieved well over 95% yield, mostly due to the skills of their own technical staff debugging problem boards, with a little bit of supplemental help by LBNL engineers.
Collected analysis of V5.0 and V5.1 DOM MBs
[documentation has lagged a little behind repairs; there are more trouble reports than entries in the HTML list]
[some boards are not completely diagnosed, but instead, assigned into software test subsystems]
Disgnosis of DOM failures in the ice at the south pole are somewhat speculative, since it is not possible to probe the board in situ as much as 2500 meters below the south pole. All diagnostics must be based on data collected by the DOM itself, and transmitted to the surface.
From Mark Krasberg's powerpoint, presented at the collaboration meeting, April 12, 2006
