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- Posts: 1108
- Joined: Wed Dec 22, 2010 10:17 pm
- Location: Chicago
-I have 10^-6 torr vacuum with the new E2M2 and the serviced diff pump. However, I tried tuning it and the first time it barely competed it but turned the detector to 2600 when the last good tune was at 1300. Since then cannot achieve constant peak widths. The tune masses like either like blobs of peak, noise, or occasional flashes of good mass peaks.
-I took the source apart and cleaned it. Nothing popped out. insulators look good, it is missing the washer that sits behind the repeller nut and in front of the insulator but I just made sure not to over tighten it. Source was a bit dirty in the usual spots but not too bad.
-I tried restoring the tune file from setup. I also tried inputting the last known good values to give it a starting point.
-I also tried both filaments.
-The only thing that is hard to see is the calibrant level. It looks competely full but it is hard to tell as the vial is far into the collar so it is either completely full or completely empty.
-Vacuum goes down when tune starts so it looks like the valve is opening.
Ideas??