Chromatography Forum

Hello
We are running EPA 524.2 Drinking water. Agilent GCMS 7890A/5975C
We are performing some procedure to help pass BFB criteria.
After Autotune go to manual tune - Entlens to 0 - ramp
For a while we have double emission.Never saw before.
Does it mean that something wrong with GCMS?
If somebody has any suggestion about please post it.
Thank you

Perhaps I do not understand, but this looks like a ramp of the emission current, rather than the entrance lens. Is that what you meant?

Yes, this is an emission.
I did not mentioned in my 1st post.
Yes we do Entlens to 0, then emission and ramp. Then all 3 ramps should max around same point.
Before we did not have this split at 20. It was just 3 ramps went from 0 and max at 35.
Now it looks like we have to sets. First at 20 and 2nd at 34.