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- Posts: 3475
- Joined: Mon Jan 07, 2013 8:54 pm
- Location: Western Kentucky
dsarf wrote:
Hi xutang2000,
Sorry for late response, I didn't clean my HED since the instrument noise report said, there is no different noise between clean reference HED with my instrument report. And unfortunately my noise background still persist . Do you have any suggestion for this? since you seem face equal problem.
for mgaskins,
Thank you for your help to identified HED. Do you have any idea with the screen shot i shared?
About the second macro command I did
for bigbear,
The insulator suggestion, I still looking forward on that
I still struggle on this problem any advice could be very valuable for me.
Hope any other member could give other help
Thanks all
Try reducing the EM volts to 2200 and see if you still get enough sensitivity for your work and also lose the high background noise.
It could be that your EM is starting to go bad slowly. Also if you are not getting enough vacuum, it could be the tune is compensating and raising the EM too high giving you the high background. A Electron Multiplier that is in good shape should give you those abundances you see there at below 1400 volts if all else is working well.