User talk:Dalle

Dear Dalle,

I read your bio and comments regarding metrology and you are certainly the most knowlegable preson I've encountered in this area. I have recently been given an opportunity within my company for a possible job as a metrology technician. Usually we are trained and then tested for aptitude before being awarded a position. This time, in lieu of training, I was given a few websites to train myself by until my test in a couple of weeks. Honestly, the sites are useles at this point. I was provided with some sample questions that are so varied I am unsure where to begin. Would you have any recommendations on books that may cover the basics of metrology so I may get an overview? (To give an example, some sample questions are What is the Rise-time/Fall-time measured on the slope of the pulse when using an oscilloscope? and What is the difference between p and (a symbol that looks like an inverted L)? I would appreciate any suggestions you may have. Thank you, Kmskimberly Kmskimberly 01:31, 1 April 2006 (UTC)

Sorry guys, I did not see that there was messages here. It's been a while since I looked at these pages.

Kmskimberly: For some of the basics on metrology, you could have a look at "Calibration: Philosophy in Practice" published by Fluke Corporation. It's mainly electrical calibration (Fluke makes calibration instruments), but a lot of the basics are there. Otherwise, look at some of the information at the national metrologi institutes sites, e.g. nist.gov or npl.co.uk, they often have som basic information as well. Many engineering handbooks discuss metrology in some form.

As to you questions, rise- and fall-times are often a matter of definition, depending on the pulse shape. Often a 10%-90% rule is used, i.e. the time from the signal to change from 10 % of the amplitude to 90 % of the amplitude. The p could be a lot of things, pressure or power (this would normally be a capital P), the inverted L is a capital greek gamma, used for reflection coefficient (in microwave engineering). --Dalle 15:05, 17 August 2006 (UTC)

Dear Dalle,

since you are interested in metrology and chaos I would appreciate your help and you neutral POV on the things that happen on the mass-to-charge ratio page. The source of the problem is that in mass spectrometry it has become usual to turn the a quantity mass-to-charge ratio into a dimensionless quantity by dividing it through physical units and constants, specificaly Da and e. Of course, every quantity could be made dimensionless in this way. Please have a look at the discussion page, too.


 * thanks, Kehrli 12:45, 17 April 2006 (UTC)

i dunno if you're still active here but...
... could you fix at least the most salient problems with the metrology article? just telling us how bad it is doesn't help except to warn us away from it. but i could really use a good metrology reference article. take a look at the Talk:Metrology page, if you want. r b-j 02:11, 16 August 2006 (UTC)

Rbj: Yeah, it haven't gotten around to it. My comments came out of frustration, but may appear somewhat hollow when I haven't contributed yet... --Dalle 15:05, 17 August 2006 (UTC)

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