= PR2 =
As reported in klog#6423, one BF-LVDT signal (BF-LVDT-V2) was *NOT* what we expected even though the coils were electrically connected properly.
Then in order to check if this issue was caused by the circuit or not, I swapped the BF-LVDT-V2(Not good one) and BF-LVDT-V3(healthy one) cable at the LVDT distributor.

== Procedure ==
-- check the original time series, Figure 1.
-- swap the V2 and V3 cable, Figure 2.
-- revisit original configuration (V2 was connected to V2 port, and V3 as well), Figure 3.

As shown in Figure1 and 2, V3 signal was not shown in V2 monitor properly but the V2 signal showed up in V3 monitor, and thus the problem should be in LVDT board (or could be distributor).
HOWEVER, as Figure 3 showed, after re-swapping (by a few times) V2 signal went back in a typical one somwhow maybe the condition of electrical connections are not rigid in somewhere..