D-40DShift Error S(MPE)The Shift Error for calipers is the error of indication for areas other than the outside measuring face. In the ISO-2019 standard, all measurement errors (inside, depth, step, and I.D. measurement error) other than the outside measurement error (EMPE) are Scale Shift Errors (SMPE). Test points and their number were newly quantified as the type of errors included in the Scale Shift Error were better specified. (Fig. 2, 3, Table 3)For example, for depth measurement or step measurement, the standard specifically requires one or more test points at less than 50 mm and a testing arrangement using gauge blocks.(See Table 3)Support for ISO 13385-1:2019The ISO standard for calipers, ISO 13385-1, was revised and published as ISO 13385-1:2019 in August 2019. The major point of this revision is that it more specifically quantifies the notation and the inspection methods, etc. related to caliper accuracy. This quantification does not affect the quality of calipers manufactured in the past, as they were measured and inspected in an agreed, standardized way in line with certain methods and criteria. The following paragraphs explain points and changes in the revised ISO 13385-1:2019.Partial surface contact error E(MPE)The partial surface contact error of a caliper is an indication error applied to outside measurement.The ISO-2019 standard quantifies for each measuring range the testing method and criteria, such as test points, number of tests, and testing arrangement that were previously left to the manufacturers’ own criteria.(Fig. 1, Table 1)Furthermore, the revised standards require testing in 90% or more points within the product measuring range as well as testing at the root and tip of the jaw at the maximum/minimum point. Therefore, it is important to conduct tests following the newly defined standard.The following is an example of measurement for a 150 mm caliper. To comply with the ISO-2019 standard, the minimum number of test points is five for a 150 mm caliper. (Table 1) Five or more test points are necessary to comply with the ISO-2019 standard. These include testing at the maximum and minimum point, as well as at the root and tip of the measuring unit. These test points must add up to a total of five. (Table 3)Ex.) Step and depth measurement[ISO 13385-1:2019]Test numberingTest pointReference standard1Less than 50 mmGauge blockScale Shift Error measurement example-depth measurementEx.) For a caliper with a measuring range of 150 mm, the revised standard requires five or more test points.Scale Shift Error measurement example-step measurementMeasuring range (mm)Minimum number of test points15053006100071000 or more8Number of partial surface contact error test points (Table 1)(Fig. 1)(Fig. 2)(Fig. 3)

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