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Author Topic:   Linearity
Lurker (<10 Posts)

Posts: 3
From:Costa Rica
Registered: May 2001

posted 03 May 2001 09:52 AM     Click Here to See the Profile for Zorro   Click Here to Email Zorro     Edit/Delete Message   Reply w/Quote
I need to make a linearity test to a tester designed by me, but I don't know how to select wich values I have to messure to deliver linearity. For example, my tester can messure 1000 ohm with a %error=0.02%, but if I messure 10 ohms with the same scale, this messure has %error=1%.
Is it right if I make a linearity test using patron values fron 10 ohm to 1000 ohm?

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Al Dyer
Forum Wizard

Posts: 622
From:Lapeer, MI USA
Registered: Oct 2000

posted 03 May 2001 06:06 PM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote

You would be correct to measure values throughout the working range of the gage. I can't say where in the scale you could do the measure.

100/200/300/400 etc... might work. What you could do is define which values you will be working with and incorporate them into the study.

Start with the 100/200/300/400 etc... and then review which intervals are called out for on a particular requirement. You might have a customer requirement for 152 +/- 5. Incorporate the 152 as part of the gage study.

There has got to be an easier way to explain it so maybe one of the pro's here can help me!


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Atul Khandekar
Forum Contributor

Posts: 21
From:Pune, India
Registered: Mar 2000

posted 04 May 2001 02:22 AM     Click Here to See the Profile for Atul Khandekar   Click Here to Email Atul Khandekar     Edit/Delete Message   Reply w/Quote

I'm not sure whether you are the manufacturer or also the end user of this instrument.

I'll use an example of a vernier. As a user, if I have to measure jobs
that are below 100 mm, I would go & buy a 0-100 vernier. If dimensions to be measured are higher (say, 300 mm & above), I would use a 0-500 vernier. It would be a very rare case for someone to measure at 150 level with an instrument having a range 0f 0-1000.

For a 0-1000 instrument,IMHO, you can use intervals that are more spaced apart at its lower end.

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