A module that works on a desk can still fail in a car, a warehouse, or a medical cart. Testing is how you find that before the customer does. This is the factory view, rewritten from our older test note, not a certificate wall.
What we actually check
The list below is the core of incoming and outgoing inspection for OEM camera modules. Exact limits follow the customer drawing. If the drawing is silent, we still do not ship a part that only worked once at room temperature.
- High temperature and humidity storage, typically 50 C and 95% RH, then a full function and appearance check.
- High temperature storage and low temperature storage (down to about -40 C) for the hours the spec asks.
- Powered high and low temperature function tests, and a cycle between cold and hot so connectors and focus do not walk.
- Vibration along the axes the product will see in the field.
- Image checks: dust, stains, focus, resolution or MTF, colour shading, and dead pixels.
Image is a test, not a screenshot
Power-on is not image quality. We look at the chart the way the line will: is the centre sharp, do the corners hold, is there a dust ring from a dirty holder, did the IR-cut stick? A pretty JPEG from one sample is not a lot.
That is why the custom camera module flow puts test and calibrate in the same sentence as industrialize. Packaging choices leak into the picture too. See black PCBs.
What this is not
We do not invent an ISO number the drawing does not name. If you need PPAP, IATF, or a medical protocol, that is a project, not a blog post. The tests above are the baseline that keeps a USB, MIPI, or endoscope lot honest.