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I need some advice regarding Bioscope SZ that I recently have started to operate (I have extensive knowledge from pervious MultiMode usage).
When aligning the laser on any cantilevers and adjusting the detector, I’m getting problem with a dropping sum signal (time dependent) ending up on low sum signals. At this point I do not know if this is hardware or software related. I will try to explain my problem and I’m glad for any suggestions on how to solve this issue.
The Bioscope SZ is us is today running NanoScope 6.13r1 software.
The problem arises when trying to align the laser on a cantilever, when having the laser on the cantilever and having adjusted the detector with normal and horizontal signals close to zero. Now the strange is happening the sum signal starts to drop from 1 down to low values close to zero. This happens on coated respectively uncoated cantilevers. Also the same effect happens after moving the laser spot slightly on the cantilever followed by rearranging the detector. For me this is strange and I have not seen this behavior in MultiMode before.
Why is this happen?
How can I avoid it?
Is the sum signal generated in the Bioscope controller or in the software?
Is it possibly to change the engage sum signal limit in the software?
Why do I have a sum signal when the laser is not reflected on the cantilever? (-1.2 V)
Why is the sum signal jumping between -10 to +10 V when adjusting the detector?
Best regards,
Torbjorn
Torbjorn, typically this type of behavior with the sum and photo detector signals indicates a problem with the head electronics or the controller. In more unusual cases it can be a dsp communication problem. Most likely a repair of one of those components will be required. Our tech support group may be able to help pin down the problem a little better.
It is possible to change the minimum engage sum signal in software but there is clearly a fault in the electronics. I would not recommend running the microscope in that state.
Please use this link to find a service contact: http://www.veeco.com/contact/Tech_Support/index.aspx
or contact me offline (mmaybrun@veeco.com) and I can give you the service office in your area.
Hello Torbjorn,
From the information in your message it seems very likely that the electronics in your scanner (TIA loops) are defect. These electronics process the signals coming from the different detector segments and finally result in the SUM signal displayed.
But to start it would be easier to help you communicating through email or phone. Please send me your contact details (email, tel, adress etc) and the serialnumber of the Microscope.
Email: mlaarhoven@veeco.com
Tel: +31-613058564
Kind regards,
Marcel van Laarhoven