IQ engineers resolve a lot of very diverse test engineering issues for electronics manufacturers. Here are some typical problems they might face. At Intrinsic Quality, we know that the test engineers that we work with are a busy group, but we thought it would be fun to share some of the problems we face in the form of a quick quiz.
Have fun, and keep us in mind for your next project!
Test Engineering Quiz #1
Question 1:
A test fixture requires three small (150W) closed frame power supplies to be mounted near one another. Because space is limited, should these supplies be mounted right side up and stacked one on top of the other? Or should the supplies be turned on their sides and mounted side by side? Why?
Question 2:
Jeremy needed to measure voltage at a test point that should have a nominal value near 200VDC. However his low cost A/D instrument only had a 10V range. So Jeremy connected a series 20MΩ and 1MΩ resistors from the test point to ground to drop the voltage.
Jeremy set up his software so that it would display a value of 21 * (A/D Value).
With his Keithley DMM Jeremy confirmed the value at 200V but his test setup across the 1MΩ kept returning 102.5V. What was Jeremy’s error?
Question 3:
At In-Circuit Test the system is capable of measuring the impedance of resistors, capacitors and inductors even though the devices are part of a complex circuit. What technique is used to perform these measurements that prevents the surrounding circuitry from dramatically influencing the measurement?
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Intrinsic Quality LLC 