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Thermo Fisher Scientific

No DF4 Signal on EELS


No DF4 signal on EELS


Themis Z G3


These are possible resolutions for the issue:

  • Select DF4 in the Idle STEM Detector of Acquistion Monitor


These are possible causes for the issue:

  • User didn't select the type of STEM signal in Idle STEM Detector of Acquistion Monitor manually.


This is a Win 7 based system, the signals from the STEM detector enter via PIAM X11 and X14 (see attach image 1) and route to PIAM X23. This routing mechanism is called “Idle stem detector”.

Detector signal is available on connector X23 as soon as PIA stops acquiring. In order to channel DF4 to EELS, it need to be selected in the Acquisition monitor, see attach second picture. This is a service tools, selecting can only be make in customerservice account.




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