Formerly the arc length error for the insulationresistance instrument is defined by scale arc length. At present national standard determines that the percentage of indicated value expresses it.
绝缘电阻表以前是按标度尺弧长定义的弧长误差，现行国家标准规定以指示值的百分数表示。
2
It has excellent electrical insulation property, flame retardant, arcresistance, suitable for clapboard of switch cabinet and can be machined to all kinds of insulating structural parts.