Agilent Testing Automotive Fuse Boxes with i1000D SFP In-Circuit Test System - Application Note 5991-4353EN free download

File name Testing Automotive Fuse Boxes with i1000D SFP In-Circuit Test System - Application Note 5991-4353EN

Keysight Technologies Testing Automotive Fuse Boxes with i1000D SFP In-Circuit Test System Application Note Introduction The fuse box inside the car is the only part that connects to every electric feature - the lights, the engine, the transmission, and the audio. This fuse box, comprising a board with a bunch of fuse seems to be simple, but it is definitely critical for the smooth running of all the cars on the street. The Keysight Technologies, Inc. i1000D small footprint (SFP) inline in-circuit tester is designed to test it with the best fit of features. Inside this little black box is an array of colorful fuse plugs inserted in terminals mounted on a printed circuit board. Each fuse is color-coded to represent its specifications. A fuse board is not a complicated circuit to comprehend. Basically, it's made up of a bunch of fuse terminals, each soldered and connected on the printed circuit board. There will be some passive components like resistors, capacitors and diodes mounted as well, but nothing complex. However, it is not as easy as it seems when it comes to testing this board. Being one of the critical components in a vehicle, a simple board like this does warrant some serious test requirement considerations. Let's begin with a look at a typical manufacturing line setup. Typical fuse box manufacturing process Plastic Molding SMT Board level Test AOI testing Assembly Final assembly Functional Test Fuse placement Cover Laser marking The process begins with surface mounting of the components and fuse terminals onto the printed circuit board. The printed circuit board is usually built in a panel of multiple boards to cater for lower manufacturing cost. The assembled circuit boards then get to their first test station where they are tested at Board level. At this stage, none of the fuse plugs are inserted yet. So the board simply contains only some components and a lot of fuse terminals. Testing at this stage basically ensures that the printed circuit board is in good condition before the rest of the parts are installed. After passing the Board level test, fuse plugs are then inserted along with the rest of the components and plastic parts. The unit then move onto the Functional test station to undergo a more detailed test for the inserted fuses and parts. Finally, when the unit passes the Functional Test, it is then boxed up and marked. 3 Inspection and Test Strategy Fuse box manufacturing test requirements