器件名称: 2790-HH型双模块系统
功能描述: 适用于低、高电压/电阻应用
文件大小: 505.08KB 共12页
简 介:Number 2378
Application Note Series
Introduction
Testing Dual Airbag Inflators and Modules with the Model 2790 SourceMeter Switch System
100mV or less. A four-wire connection must be used to ensure reasonable accuracy for this test. For more information, refer to the section titled “Lead Resistance.”
A typical airbag inflator is a two-terminal device in a metal housing and is used to initiate the deployment of the bag in an automobile crash. Modern passenger restraint systems incorporate a dual inflator, which allows for variable inflation rates, depending on the speed of the vehicle crash. One inflator is used to deploy the bag for low speed scenarios; the other is used for higher speed collisions. The pyrotechnic device that actually triggers the gas discharge, which inflates the airbag, is called an initiator. The resistance of the initiator is a valid indication of a good device. Testing the initiator is much like testing a fuse; if too high a current is used, the fuse will open up and must be scrapped. For an initiator, the test current must be kept below some specified level to prevent activating the inflator prematurely, which would not only destroy the DUT, but also presents a potential hazard. An initiator must be electrically isolated from the inflator housing because excessive leakage current between the housing and the initiator can prevent proper operation of the device. Consequently, an airbag module requires two resistance measurements. One test (for the ini……
