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Metrology Control Charts for Reference and Working Standards

R

Rmack

#1
Hello,

I've recently picked up the responsibility for the control charts we use to track our refernce and working standards. The method they were using was to record each reading in an excel spreadsheet and graph the results. Seems like there has got to be better way, especially when using that method to track the performance of a Fluke 5720 or Agilent 3458.

I am considering narrowing the scope and maybe tracking the top and bottoom readings for each range. Still a lot of data but a little better.

Any suggestions on a better method?

Thanks,

Rick
 
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BradM

Staff member
Admin
#2
Hello Rick! Glad to see you post here at the Cove!:bigwave:

I guess I would be interested to know what you are using the data for.

If you are making decisions about extending calibration intervals, I would just be interested in the % of full tolerance it was found at calibration. If the percent is low, then you can possibly extend the cycle. If it is at 100%, maybe shorten the cycle. If it is at 50-80%, then it is probably just right. :)
 
Last edited:
R

Rmack

#3
Brad,

Thanks for your reply and welcome :). The truth of the matter is that while there is a ton of data, going back 20 years in some cases, it's not in a format that can be used for interval analysis. The existing charts don't work properly and there is so much data in the ones that do that they're nearly unreadable. I'm trying to get it organized so it can be.

What's puzzling me is how best to go about it. I could chart out each measurement point (190 for a Fluke 5720A or 226 for a Wavetek 9100) but it seems like overkill. How do you guys track these sorts of things?

Thanks,

Rick
 

BradM

Staff member
Admin
#4
Rick, I am just not sure what the value would be you to, but I am unfamiliar as to your risk level.

Now... do note I am one person out of... a billion or so..:lol:, but I just keep general data on the test instruments to determine a trend. If the process is stable, obviously less data is needed than the new processes/less-stable processes.

My suggestion would be to chart out each instrument, maybe on the percent of tolerance (overall) the instrument was found as last calibration period.
 

BradM

Staff member
Admin
#5
If you are making decisions about extending calibration intervals, I would just be interested in the % of full tolerance it was found at calibration. If the percent is low, then you can possibly extend the cycle. If it is at 100%, maybe shorten the cycle. If it is at 50-80%, then it is probably just right. :)
Fixed!! :agree1:

Thank you very much, DV8Shane, for noticing my error and sending me a note about it. Much appreciated. :agree1::yes:
 

ScottBP

Involved In Discussions
#6
Fluke put out a paper on using MET/CAL to do control charts. Of course, this takes software wizardry, as you have to go through the nitty-gritty of setting up MET/CAL procedures to take the data in the first place, and then execute SQL queries to pull the data out of the database to be charted and set up some macros to insert the data into control charts. Have a look at the paper.
 

Attachments

R

Rmack

#7
Thanks for the paper. Looks like it might be well worth the tinkering time it'll take to get it going for that level of results.
 
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