Loop troubleshooting effort -- fail

Each student, in nearly every lab activity, must troubleshoot a fault the instructor places into a measurement or control loop. They are given 5 minutes to isolate the type and general location of the fault, and more time (if necessary) to precisely identify and rectify it. The instructor begins by playing the part of a bewildered operator, telling the student (the technician) what the system isn't doing right. Throughout the exercise, the instructor asks the student to explains their reasoning and their diagnostic method to ensure they aren't just guessing theuir way through. In this activity, the student's troubleshooting procedure was not rigorous enough to locate the fault in the allotted time, and he failed the exercise as a result. Being a "mastery" type of assessment, the student is given multiple opportunities to re-try and get it right (on a different loop, with a different problem each time).