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https://drive.google.com/file/d/0B_Tcj92ikWdPWWNVUF9Lc29RdW8/view?usp=sharing
It's very consistent that pulsations appear at approx. 70-min interval and each pulsation lasts for around 20 min.
At first we suspected that it is due to the new suppressor, so we replaced it with a CSRS300 which is working perfectly on another IC system. The problem persists. It could rule out the suppressor problem. The pressure has been monitored and it appears to be very stable.
Any advices/suggestions are highly appreciated!