Issue link: https://iconnect007.uberflip.com/i/1150604
70 SMT007 MAGAZINE I AUGUST 2019 ation in measurement results was compared between the digital positioner micrometer tool compared to the new eddy current probe. Fig- ure 2 shows a comparison of the operator mea- surements for each coupon using the existing measurement tool. This shows clear inconsis- tencies between each operator using the digi- tal positioner micrometer tool to measure the same coupon. Figure 3 shows the same four operators measuring the same 20 coupons but now with the eddy current probe, which shows clear improvement compared to the measure- ments in Figure 2. The standard deviation was calculated for each coupon for each measurement tool used, and Figure 4 shows a comparison of the stan- dard deviation of each measurement tool. The eddy current probe has a significantly lower standard deviation between measurements performed by multiple operators measuring the same coupon and therefore has proven to be a much more reliable measurement tool. Ensur- Figure 3: Operator comparison measuring with the new measurement tool. Figure 2: Operator comparison measuring with the existing measurement tool.