MEASURING APPARATUS FOR SECULAR DIMENSIONS CHANGE

摘要

PURPOSE:To implement a quickly measuring dimensional changes with the passage of time reliably and accurately by amplifying and recording the output of a differential transformer with a terminal thereof pressed against material to be measured fixed by a jig. CONSTITUTION:A product to be measured is supported with a jig and a terminal of a differential transformer is pressed against the product. The output thereof is amplified and recorded. For example, the product is supported at a fixed position with a ram member 12 provided on a jig plate 11 and differential transformers 20 each mounted on members 13 and 14 each is pressed against the product and the output is amplified and recorded. This facilitates accurate measurement of secular dimensional changes of a resin product or the like.