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1. Close 'Process Eye Window' fully, and reopen.
2. Select the multiplier calibration button  and hit next.
3. Choose 'Multiplier 1' and hit next
4. Select 'Use Faraday detector to determine the pressure at the calibration mass and hit Next
   1. 
5. Change the mass to be used to 28 and hit next
6. Select 'Define the gain in terms of the exact gain
   1. Enter 50 for the Detector gain and hit Next
7. Select 'Run with no operator intervention', 'acquire data from the peak centre only', and 'apply the results of this calibration to both filaments'
   1. Double Check that the pressure at the CCG still reads the anticipated value, if not, open the leak valve slightly to until CCG reads that anticipated value
8. Hit Finish
   1. Note: If calibration stability is poor, calibration needs to be done again.
9. Repeat M1 Steps 1-7 for Multiplier 2 calibration, except now entering 100 for Detector gain

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1. Close 'Process Eye Window' fully, and reopen.
2. Once in the e-8 or e-9 regime, Select the multiplier calibration button  and hit next.
3. Scale to an externa, pressure gauge on the process Chamber
   1. Insert CCG Value
4. Change the mass to be used to 28 and hit next
5. Select 'Define the gain in terms of the exact gain
   1. Enter 200 for detector gain
6. Select 'Run with no operator intervention', 'acquire data from the peak centre only', and 'apply the results of this calibration to both filaments'
   1. Double Check that the pressure at the CCG still reads the anticipated value, if not, open the leak valve slightly to until CCG reads that anticipated value
7. Hit Finish
   1. Note: If calibration stability is poor, calibration needs to be done again.

Step 4: Testing Calibration Status/Effectivity

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1. Collect data, about 4 scans, in accuracy 5, with Multiplier 3.
2. Observe the pressure (sum of scanned masses) at the RGA head
3. It should now be within a factor of 2 of the CCG
   1. If this is not the case, repeat the calibration process for the multipliers, increasing or decreasing the gain depending on if the pressure reads to low or too high, respectively
4. Collect 2 hours of data, Accuracy 6, and report RGA status to Peter, and later to ServiceNow
5. Insert Calibration result into Google spreadsheet under 'Cart Qual Status' and to its respective Cart Tab.

Related Documents

• HPS_FRS_Template_and_Outline .docx 
  • Look at section 7.2 (RGA Calibration)

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