Why We Stress-Test Every Single Wafer IR Sensor
When you’re processing silicon, the stakes are crazy high. One tiny electrical leak? That’s it. Your entire batch is scrap. That’s why we don’t do “sample testing.” We don’t just check every tenth sensor and hope for the best. We put every single unit through HiPot and insulation resistance testing before it even thinks about leaving our floor.
Breaking things on purpose
Here is the thing: we intentionally push the insulation to its limit. We want to find the weak spots. By cranking the voltage way past what you’ll ever see in normal operation, we force the hidden flaws to show themselves. We’re looking for the stuff you can’t see—a microscopic air bubble in the epoxy or a hairline crack in the ceramic. If it’s going to arc, we want it to happen here.I’d much rather burn out a sensor in my lab than have it short out inside your vacuum chamber.
The difference between a “blowout” and a “leak”
High voltage tests are great for finding the catastrophic failures. But “leaks” are a different story. That’s where insulation resistance comes in. We measure things in mega-ohms to make sure the electricity stays exactly where it belongs. In a fab, you’re always fighting electromagnetic interference. If the insulation is sloppy, you get signal noise. That noise drifts your temperature readings, and suddenly your thermal profile is a mess.
The balancing act
Now, you can’t just blast a sensor with infinite voltage. If we over-test, we actually start wearing down the materials. It’s a bit of a tightrope walk. We set the voltage high enough to catch the defects, but not so high that we shorten the sensor’s life. But there’s a catch. Even the best-insulated sensor in the world will fail if your machine’s chassis has a floating ground. You’ve got to make sure your system’s grounding is dialed in. We’ll provide the hardware that handles the heat; you just provide the clean electrical environment to keep it steady.