Apparatus and method for monitoring the effects of contact resistance

摘要

An electronic module tester measures the difference between the voltage provided by the tester during testing and the voltage actually delivered to an electronic device. The difference corresponds to a voltage drop associated with the contamination contact resistance. This resistance builds up on contact surfaces of the tester as many modules are inserted and extracted. One power line and one ground line from the electronic module are isolated and connected to a voltmeter for a direct measurement of voltage on the device. A comparison is made with the power supply voltage provided by the tester to the device under test. A voltage difference exceeding a predetermined value initiates further action prior to continued testing, such as contact cleaning.