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It is also possible that the electronics are not grounded properly.  You
can get electronic noise from an improper ground loop.  It's also possible
you have light leaking in from somewhere; I've gotten stripes in images
from flashing LEDs on equipment near the microscope.  A quick piece of
black tape over the offending LED and no more noise!

Craig


On Thu, Dec 13, 2012 at 11:46 PM, Pascal Weber <[log in to unmask]>wrote:

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>
> Hi everebody,
>
> I had heard about the problem of sensitivity of PMT has been set by a
> technician
> linearization sensitivity. (Procedure to apply)
> For sensitivity to mobile I am very surprised and I do the same test!
>