- verify Hsync, Vsync, Pixel clock outputs from Zeiss PC, these look good.
- Pull multichannel receiver out of rack, verify signals arrive on board, they do.\
- Shut down PC and reseat PCI cards (Zeiss control and Omicron data acq)
- this was suggested as a possible fix for detector contrast problem
- Now try ISEM DMA
- now it works. no obvious problem fixed???
- put back in rack, still works
- image acq will be painfully slow. Test with spectra at, for example, 1 ms acq time. cannot see Si KLL on Si, for example
- with CRR 3 and 25 ms/pixel, can start to see spectra (10 kV max current)
- with 200 ms, not bad
- image time line by line ~ 2-3x raw image time (zeiss) for fast scans, overhead may reduce
- optimal image (no OH) at 0.2 sec, for 2x512x384, around 20 hours...
- there is a line scan mode, can do point by point or line by line, but cannot get line data, only peak/back. No chance for own processing.
- for Au on Si, large backscatter and noise effects, swamps real contrast
To try
- can take reduced image for test
- can modify data 'schema' to get access to raw images peak/back acquired line by line, for post process later
- can try multipoint acq to get family of spectra, but OH and data format may be a pain.
- need to test data export, image dynamic range may be reduced either to 256 or 100 values (bad)
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