DaveB & HughR

Spotted continual saturations on the HAM45 SEI IOP and was traced to the subj sensor.  The saturations don't show on the ISI ADC monitor since the first encountered part in the model is not an epics widget; hey hey pretty smart eh!  Pays to hang out with DaveB!

Sure enough this led us to find the Corner 3 L4C Pressure way out of norm.  Fortunately, maybe, the numbers are not an indication of the Pod leaking but of the electronics going south.  That is, if you believe the numbers etc, the pressure in the pod has increased, alot.  If the pod (in vacuum) were to start leaking, the pressure inside, nominally at atmosphere, would decrease.

There are no alarms on these channels, you know, operators hate alarms, and the channel has been in this state since 12 April.  This was after the vent and subsequent pumpdown of the vertex but on the 12th there was activity around HAM5 with viewports looking and leak checking.

The channel also shows a glitch back around early October.  While all the HAM5 pods show a glitch then, it appears this was a power cycle as most direct readings went to zero.  Anyway, sure looks like the L4C Pod is behaving as if in a 'vacuum' as its sisters are not sympathetic.  Trending all the pods (attached is 300 days) shows another glitch in Late October and one might notice that the Corner3 Pod glitches in the opposite direction as its sisters and hits the value were it now remains since the 12 April excursion.  This is also the saturation value:  (124-30)/2.861e-3=32k.  Nominal value at 1 atmosphere ~101kpascals is (101-30)/2.861e-3=~25k which is where all the other ADC inputs for the HAM5 pods are currently.

Will consider some test to determine if this is or is not an in-vacuum problem.

FRS 10499