ISO 9336-2-1994 光学和光学仪器光的传递函数应用第2部分:办公复印机用镜头

上一篇: ASTM E677-1994(2004) 可互换的圆球形接头
下一篇: ASTM E982-1994(2004) 实验室用玻璃试管

标准名称：	工业自动化仪表通用试验方法 频率响应
中标分类：	仪器、仪表 >> 工业自动化仪表与控制装置 >> 工业自动化与控制装置综合
替代情况：	被JB/T 9233.21-1999代替
发布日期：
实施日期：	1990-01-01
首发日期：
作废日期：
出版日期：
页数：	3页

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Product Code:SAE J2790
Title:Test Method for Evaluating the Electrical Resistance of Coolant System Hose Covers
Issuing Committee:Non-Hydraulic Hose Committee
Scope:This test method provides a standardized procedure for evaluating the electrical resistance of automotive coolant hose covers. It is know that an electrical potential exists between the engine and the radiator. Coolant hose cover conductivity has been determined to be a factor in reduced hose clamp life when vehicle build variations allow possible contact of the hose or the clamp to contact metal components on the radiator and engine thus completing an electrical circuit. The ensuing electrical current can undercut the clamp protective coating, leaving it vulnerable to the corrosive effects of road salts, moisture, and other environmental contaminants. SAE Recommended Practice J1684 addresses the conductivity of the tube portion of the coolant hose.