If you put the electrodes in the right position and you measure in the right way you can detect the electrical activity of the heart and record it on a strip recorder like this one shown here, or display it on a computer.

如果将电极放置正确,并采用正确的方式检测,就能检测到心脏的电活动,并将它记录在像这样的长图记录仪上,或者显示在电脑上

耶鲁公开课 - 生物医学工程探索课程节选

DirecTV sends out such signals about twice a month, but according to The Carmel Group's Sean Badding, intrepid pirates can effectively block ECMs using devices called emulators, or if that fails, reactivate a "burned" card using a "card strip box" that connects to a personal computer.

FORBES: DirecTV Declares War On TV Pirates

Officers also recovered an electronic strip containing batteries and a camera, and a black bag being carried by Sorin contained a computer device.

BBC: NEWS | UK | England | Devon | Card fraudsters face deportation

"We completely strip each of the browsers' processes of all their privilege to access the rest of the computer, " says Linus Upson, Google's engineering director.

FORBES: The Web's Edge