[b1_ana] Fwd: bcm asym plot

[J. P. Chen]

Hi, Dustin and All,

This plot is one BCM (up) vs another (down), which is not just
calibration constant, but the actual performance of the BCMs.
The oscillation is not that important: one should be able to get rid
of them by careful thermal isolation of the BCMs. Due to the large
oscillation, the long-term drift is not clearly shown out. We need to 
extract
the long-term drift from this plot to give us some idea how good/bad
the low current BCMs can achieve.

Cheers.

Jian-ping

On 5/31/2013 5:14 PM, Dustin Keller wrote:
> These changes are too big.  What I see using variation in the
> calibration constant of the BCM is 0.02% for six days.  We
> need something on that scale.  It looks like what this plot is
> showing is the deviation in up and down.  A drift with
> respect to one another, rather than the Cal. Con.
>
> dustin
>
> On Fri, 31 May 2013, J. P. Chen wrote:
>
>> Hi, Karl,
>>
>> Here is a plot from g2p data on BCM drift from comparison of two
>> BCMs. Apparently there is an oscillation, which probably is due to
>> one of the BCMs might not be thermal isolated too well. They are very
>> sensitive to temperature changes. We need to do a better job for the 
>> future
>> experiment.
>>
>> Let me know if you have any questions.
>>
>> Cheers.
>>
>> Jian-ping
>>
>>
>> -------- Original Message --------
>> Subject:     bcm asym plot
>> Date:     Fri, 31 May 2013 16:58:44 -0400 (EDT)
>> From:     Melissa Cummings <melissac at jlab.org>
>> To:     jpchen at jlab.org
>>
>>
>>
>> Hi JP,
>>
>> Attached is the bcm asymmetry plot.  Let me know if you need the
>> formatting changed, it's easy enough to fix.
>>
>> Have a good weekend!
>> Melissa
>>
>>
>>
>>