During one of Fabrice's final measurements on our Unit#1 Assy, it was noticed that the V2 GS13 appeared to have a gain of 2 lower than everyone else.  We wanted to check this out.

Today, the Seismic Team finished moving all the GS13's from Unit#1 to Unit#2.  Today, I ran power spectra looking at the GS13's in various states.  [See attached plots]

Meas UL:  This was with Unit #2 Locked.  Here V2 looks to be ok (if anything it seems bigger than everyone else (in contrast to the Meas LL below).

Meas LL:  This was an old measurement from a locked Unit #1.  Here may be the gain of 2 less on the V2 GS13.

Meas UR:  Here Unit#2 was UNLOCKED.  Everything looks normal here.  All the H's look similar and the V's look similar.

Meas LR:  The H2/V2 cable was swapped with the H3/V3 cable (Unit#2 is locked).  Nobody looks glaringly different on this plot.

The DTT data taken for this measurement is available for your perusal here:

/opt/svncommon/seisvn/seismic/HAM-ISI/X1/Data/unit_2/dtt/20100729_geo_V2check.xml