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Profilometer Calibration - Presently I calibrate a roughness specimen patch


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calibration procedures and methods, profilometer
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  Post Number #1  
Old 12th January 2007, 12:01 PM
Phil Fields

 
 
Total Posts: 376
Please Help! Profilometer Calibration - Presently I calibrate a roughness specimen patch

Hello,
I am asking for input to how other deal with calibration of profilometers. Presently our company calibrates a roughness specimen patch, then verifies the profilometer against the calibrate specimen.
Does anyone actually calibrate the profilometer (in-house or outside service)?
We have a Hommel Tester T500, the brochure I have, from there website, states, “No calibration required.” I do not understand this, how do I trust the measurement without comparing it to a know standard?

Thanks for the input,
Phil

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  Post Number #2  
Old 12th January 2007, 12:47 PM
Jerry Eldred's Avatar
Jerry Eldred

 
 
Total Posts: 528
Re: Profilometer Calibration

This will probably age me, but back in the 80's I calibrated some Dektak Surface Profilometers. It was done with a certified Step Height Standard. Basically is is a certified "ridge" on a flat surface, with a known height. These were in the microns (in terms of their size). I am not familiar with the profilometer you mentioned, but my input would be that you are correct. You have to have some sort of traceable standard to know your profilometer is accurate.

You could do a web search for Dektak, Step Height Standards, or "VLSI Standards". The third one (VLSI Standards) is a company in California that makes very good standards (at least they used to). I actually have some of these standards in my garage I grabbed during a factory closure a number of years ago (although I am not trying to sell them here), just a general comment to illustrate my familiarity.
Thanks to Jerry Eldred for your informative Post and/or Attachment!
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  Post Number #3  
Old 12th January 2007, 12:50 PM
D.Scott's Avatar
D.Scott

 
 
Total Posts: 1,592
Re: Profilometer Calibration

We use a roughness specimen purchased from and calibrated by the manufacturer. This is traceable to NIST and is kept in our lab for the sole purpose of verification of our profilometer.

So far, the method has never been a problem.

It sounds as though the Hommel tester comes with a similar specimen block so you can do your own verifications without sending the tester out for calibration. I am not familiar with that tester so I can't say for sure.

Dave
Thanks to D.Scott for your informative Post and/or Attachment!
  Post Number #4  
Old 12th January 2007, 01:48 PM
jane_ackerman - 2010's Avatar
jane_ackerman - 2010

 
 
Total Posts: 76
Re: Profilometer Calibration

The previous 2 replies are correct in that you should have your specimen outsourced to a calibration house that has that type of specimen within their scope.
Then you can use the specimen to verify the gage is reading correctly and make adjustments if necessary.
  Post Number #5  
Old 12th January 2007, 02:31 PM
Phil Fields

 
 
Total Posts: 376
Re: Profilometer Calibration - Presently I calibrate a roughness specimen patch

Thank you for your replies, this verifies that I doing this correctly and will satisfy managements’ questions.

Phil
  Post Number #6  
Old 6th January 2014, 01:59 PM
dublbee

 
 
Total Posts: 1
Re: Profilometer Calibration - Presently I calibrate a roughness specimen patch

Thank you very much! This site is spectacular!
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