[evlatests] 3-bit status

[Barry Clark]

Perhaps we should wait on returning the old samplers until we do the
test to decide whether we prefer bits 012 to 123.

Michael Rupen wrote:
> There were a number of tweaks to the 3-bit system yesterday.  This is
> my understanding of what I've heard -- please send along any corrections!
> 
> 
> * New samplers in ea10, ea12; all old samplers removed from array
> 
>    We currently have all the first article sampler boards out on
>    the array, with 4 samplers (2 modules) each in:
> 
>        ea06  ea07  ea10  ea12  ea14  ea26
> 
>    ea06, ea07, ea10, ea14, and ea26 have new T304s
>    ea12 is still using old T304s -- we expect no fringes for A2C2, and
>      possibly low amp on A1C1
> 
>    The old samplers will be returned to the array once Mike is done with
>    them (primarily putting in the new firmware), probably next week.
>    T304s for these will appear a few weeks thereafter.
> 
>    Note that the sampler that was in ea15-A1 looked quite dead when on the
>    array.
> 
> 
> * The monitor point on the d301/d303 reports the following
>    serial numbers for the samplers currently on the array:
> 
>      ea06-d301  073 110921|1417
>          -d303  115 110919|1109
> 
>      ea07-d301  121 110906|1727
>          -d303  119 110907|0748
> 
>      ea10-d301  001 111003|0904
>          -d303   67 111003|1705
> 
>      ea12-d301  085 111003|1323
>          -d303   99 111004|0812
> 
>      ea14-d301  125 110912|1325
>          -d303  127 110908|1556
> 
>      ea26-d301  blank ???
>          -d303  123 110919|1421
> 
>      ea15, ea28: no 3-bit samplers any more
> 
>    Note that ea26-d301 has no serial number in there -- maybe Mike can
>    fix this?
> 
> 
> * Hichem fixed the MIB code per Barry's request, to ignore 3-bit
>    power commands if the 3-bit sampler is already on.  This should
>    eliminate various oddities we saw in our last tests (Tuesday I think?).
>    The most prominent problem from those earlier data sets was a reset of
>    the 3-bit samplers 15-20 seconds after the beginning of each 3-bit scan.
>    I believe this at least has been eliminated (thanks Hichem!) but am
>    waiting to hear back from Vivek about the more subtle issues.
> 
> 
>              -- Michael
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