JimW, HugoP,

We recently huddle-tested the T240s received in LLO's shipment #4386. We took power specra that look fine. We also checked the pressure readouts which appeared surprisingly low: ~40kPa instead of the usual ~100kPa.

We investigated this issue and found that it was caused by a model discrepancy at X1, which does not match what is installed at ETMY and ITMY (see attached screenshots of the models: X1, ETMY, ITMY).
Pressure signal processing at X1:                      Pressure_Displayed   =   Pressure_Input * 2.879e-3
Pressure signal processing at ETMY/ITMY:       Pressure_Displayed   =  (Pressure_Input * 5.065e-3 ) + 30.625

If we reverse the processing applied at X1, and then apply the one of ETMY/ITMY we then obtain:
( 40kPa / 2.879e-3 * 5.065e-3) + 30.625 = 101 kPa    
... Which is what we expected in the first place. The four T240 pods received in shipment #4386 were huddle-tested OK at recption. Results are available under the seismic SVN.

Other measurements performed during the investigation, at X1:
-We read 0 kPa when nothing is plugged into the T240 interface
-We read ~40 kPa with the T240s are plugged in
-We measured 8.36V at the T240 interface (D1002696) "to-Anti-Alias" output
-The power supplied to the T240 interface is:
   -17.96V
   +17.75V