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Message ID: 2538     Entry time: Fri Mar 12 16:29:36 2021
Author: Aidan 
Type: Update 
Category: 2um Photodiodes 
Subject: Vacuum needs leak checking 

I pumped the small vacuum volume down but the pressure started rising as soon as I turned off the vacuum pump. Closing the main valve to the pump and the valve to the chamber did little to change the leak rate. So the main leak seems to be from the volume around the pressure gauge - best guess, the section and O-ring that I connected to the chamber yesterday.

Vacuum pressure was recorded from vacuum gauge to text file in Python (using pyserial). Haven't got this into EPICS just yet. 

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