XAS Plotter Troubleshooting

XAS plotter - I cannot see my XAS data or my data looks really crappy!

 

This is usually due to:
1. Having the wrong display parameters selected for the data you are collecting.
2. The plotter window having the zoom function or the vertical cursor still activated somewhere.

 

Solution to 1:
See here for the detailed list of plot options for XAS plotter. But in general:

  • for fluorescence data being collected in SCA1, you need FF/I0 selected in the Std Plots tab.

  • for fluorescence data being collected in SCA2, 3 or 4, you need to select Custom in the Std Plots tab. Then in the Custom tab select Requested Energy as the numerator, and 1 as the denominator. Then you would select the appropriate SCA channel as the numerator (e.g. SCA2.1), and I0 as the denominator in the Y-axis group area.

  • for transmission data you should have the appropriate ion chambers selected, usually I1, either in Std Plots or in the Custom tabs.

 

Solution to 2:
The display control buttons under the main plotter panel act as toggle switches i.e. one click to turn them on, one click to turn them off. As such they can be inadvertently left on causing the default auto scaling function of the plotter window to be overridden.

 

When the zoom rectangle or the pan scan buttons (highlight by the red box below) are activated the words “zoom rect” or “pan scan” will be displayed to the right of the icons (green box below). If this is the case, click the buttons again to turn them off. Your spectra should now appear and be auto scaling (if a spectrum is currently being collected).

If this doesn’t work then the vertical cursor may be still active somewhere. In the bottom left corner of the XASplotter window (purple box below) there is some small blue text that will either say “Marker at Nonee” (then it is already off) or “Marker at energy”. If it says a number then it is active somewhere so click just off the plot axes to deactivate it. This area should now read “Marker at Nonee” (yes it’s a typo).

Final solution: If none of this works, go to the Math tab and just click one of the radio buttons (try None). 

CONTACT:

Sam Webb

samwebb@sams-xrays.com

 

© 2018 by Sam Webb.

 

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