The Nanoscale World

signal access module

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Deepak posted on Fri, Jun 19 2015 2:17 AM

Hi Friends

 

This is regarding using the signal access module with Nanoscope III a controller.

I am interested in retrieving the friction data of a sample  from the nanoscope through the signal access module. Is the above possible and if yes what are steps to be followed. 

I have been trying to read the SAM manual but am not able to understand it clearly. Any help would be greatly appreciated

 

Thanks in advance

 

Deepak 

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Suggested by Bede Pittenger

Hi Deepak,

the lateral photodiode signal can usually be accessed from the "output" BNC terminal of the Aux A channel on the SAM in both contact and tapping mode on NS3a instruments, if the SAM is connected between the extender module and the AFM. I have not tested if this is still the case if the SAM is connected between the extender and controller.

The value for the lateral deflection measured at the SAM is a factor of 1.5 smaller than that displayed in the software on the instruments that I have tested (Multimode, D3100) and the signal at the SAM appears to be lowpass filtered, but I have not measured the cutoff frequency. 

I hope this is of some help.

Nic

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Bruker Employee

Hi Deepak,

What kind of microscope are you using?  A Multimode?  Do you have an 'extender' box between the microscope and the controller?

--Bede

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Deepak replied on Wed, Jul 15 2015 12:20 PM

Hi Bede

I am using Nanoscope IIIa. The signal access module is connected between the extender and the controller

 

Deepak

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Thanks Nic,

That sounds right, although I think the scaling factor is 1.2 not 1.5 (this is due to the difference in range of +-10v vs +-12V).  Also, make sure the switch is in the 'output' position if you are just reading the signal.

--Bede

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Top 500 Contributor
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Hi Deepak:

 

Where can I find the SAM manual?

I am beginning to do friction studies using a DI-300 system.

Any help is greatly appreciated.

 

Vinnie Gupta

Professor, Mechanical Engineering

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