[Spm] Re:Spm Digest, Vol 40, Issue 7

[philippe.carl@tiscali.fr]

Hi Debby,
I guess that you are dealing with the very same issue I had problems with something like two years ago and for which I had posted a message on the spm-list.
The way I figured it out the problem is when I made an ASCII export of the same data file with the version 5.12r3 and 6.12r3 of the Nanoscope software. As both software should export exactly the same results, what you get actually out is very different.
What happens is that there was a bug in the export feature in all the versions of the Nanoscope software up to a version 5.3 something (I don’t remember exactly which version it was).
What is annoying with such a bug is that if you don’t know of such a bug, you may publish wrong results. And if Veeco is aware that there was a bug in several versions of their software, they should write something in their manual.
In all cases, the way I calculate now the scaling factor is that I look for the parameter:
\@1:DeflectionLimit: V (20.00000 V/LSB) 2.500000 V (or \@2:DeflectionLimit: V (20.00000 V/LSB) 2.500000 V)  
and then make the transformation 20/2^16=20/65536=0.00030517578125
Feel free to contact me for any addition information.
Best regards,
Philippe

---------- Initial Header -----------
Message: 1
Date: Thu, 15 Nov 2007 11:32:14 -0500
From: Debby Chang <dpc7 at duke.edu>
Subject: [Spm] Convert DI files
To: spm at spmlist.di.com
Message-ID: <473C748E.6040107 at duke.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi all,

I'm trying to figure out the correct scaling factor to convert DI files into ascii.  I'm using Nanoscope III 5.12r3 program.  It seems like the display graph by the nanoscope software is different from the ascii export. Does anyone know which one is correct??

I followed the procedure described in the Command Reference Manual and got the same result as the ascii export.  

Ex. 

\@2:Z scale: V [Sens. Zscan] (0.006713765 V/LSB) 202.2 V

Following the manual, I got the scaling factor of 0.002085 V/LSB (202.2/2^16=0.002085 V/LSB), which gives me the same result as the ascii export.  But if I use the hard-scale (0.00613765 V/LSB) to convert my data, I get the same result as the displayed graph by nanoscope. Can someone tell me which one is the correct scaling factor to use? 

Thanks,

~Debby

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