This completes WP #7119 and WP# 7134.  

PT525 finally "woke up" when, by opening GV20, the X-end pressure changed by a factor of x10.  We have noted in the past how the new-to-us Bayard-Alpert/parani wide-range gauges differ from our traditional Cold Cathode gauges, both in magnitude and general behavior.  This difference is greater as the real pressure increases.  The Parani portion of the new gauges agree well with our traditional convection enhanced paranis but in the HV pressure ranges they are just "different".  We know that the CC gauges pump with about 1 or 2 l/s pump speed while the nude BAs don't pump.  For the conductance due to our arrangement of fittings, this can explain a difference between the two gauge technologies of up to 50% but not factors of 3, 5 and 10! 

The newest odd behavior shows up as a complete "lock up" of the gauge.  It gives valid but non-changing output in the example shown recently at the X-end (see attached graphs)  
 

 
Note:  In WP #7134, I mistakenly indicated that I was leaving the 1.5" valve which isolates GV20's gate annulus from the rest of the annulus piping "open" after opening GV20 and that this was a policy change.  In fact, I am leaving this 1.5" valve "closed", as is standard policy when the 44" gate is open.  I believe that the new, "Chandra era", change in practice applies only to when the 44" gate is closed for prolonged periods.  For this case, we will now be leaving the 1.5" open so as to eliminate the need to "dump" the un-pumped gate annulus volume into a temporarily connected aux. pump cart.