1769-OW16

1769-OW16总电阻值

定义为电位器两终端(1, 3 端) 之间的电阻值。标定任何电位器时, 都需要规定标称阻值。同时应规定标称阻值的允许偏差, 而总电阻值应在允许偏差范围内。

测量总电阻值时, 一般采用数字欧姆表。在电位器有机械止档时, 动触点应尽可能靠近一个终端引出端。如果是连续旋转的电位器, 应将动触点调节到与电阻元件工作段完全脱离为止。标准测试还规定了测量总电阻值的高(直流) 电压, 以限制电阻体在测量过程中温度无明显上升。

终端电阻(零位电阻)

定义为当动触点位于邻近的止档时, 动触点引出端与该终端引出端之间获得的小阻值。连续旋转的电位器没有止档, 不规定终端电阻。

测量终端电阻时, 施加到电位器上的电压应使动触点电流不超过产品标准中规定的极限值。当动触点位于止档位置时, 1, 2 两引出端之间的小电阻值称为前终端电阻,2, 3 两引出端之间的小电阻值称为后终端电阻。

1769-OW16

1769-OW16

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