本試驗裝置為桌上型, 合UL 2556標準要求。適用于檢測電線緣體和被覆體的啞鈴狀試片厚度。
測量范圍:0.01~10mm,小分度:0.01mm。(日本三豐百分表)
荷重砝碼:85&plun;3g
試樣測頭:ø6.4&plun;0.2mm
下 測 帖:2×9mm
大理石臺座:150×200mmm
試驗方法
1、松開大理石臺座固定旋鈕,調整上下高度使百分表的指針指到位。
2、取啞鈴狀被測樣品,按下百分表的桿,將樣品放在6.4mm測頭
下,放下桿,直接讀取百分表的數值。即被測樣品的緣厚度。
UL 2556標準參考
4.2 Physical properties (ultimate elongation and tensile strength)
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
exerting a total force of 0.83&plun;0.03 N (3.0&plun;0.1 ozf) on a rectangular anvil measuring
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be slightly convex. Alternatively, these measurements shall be made with a dead-weight dial micrometer having a presser foot 6.4&plun;0.2 mm(0.248&plun;0.010 in) in diameter and exerting a total of 85&plun;3 gf or 0.83&plun;0.03 N (3.0&plun;0.1 ozf) on the specimen – the load being applied by means of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);










