How temperature affects EDM measurements

rfc · 2015-05-06T23:28:00Z

On a recent outing, I set the temperature and pressure on the gun to what it was in the am (about 45 degrees F), and forgot to increase it as the day progressed (to nearly 80 degrees F).Wondering if there was a way to "post process" measurements and change them according to what the temperature actually was at the time, I wanted to see what the errors might be, so I set up a quick test at about 100' and sequentially set the temperature in the gun from 35 degrees up to 80 degrees.The distance did not change much at all across that range, and not linearly...it seemed more random and residuals were on the order of less than +/-.001'.When I checked the ppm, it did indeed change (+ above 68 degrees or so, - below)as it should, but what's the use of setting it frequently if it doesn't make a difference?What am I missing?

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loyal

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Jim in AZ, post: 378313, member: 249 wrote: It also helps to not have both the Total Station and Data Collector applying the corrections.!

All I ever had was a field book and a pen/pencil, so that was never an issue.

My first "data collector" came along with my first GPS System.

B-)

Posted : June 20, 2016 2:03 pm

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How temperature affects EDM measurements

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