Kiểm tra PCB bằng kính hiển vi không đơn giản là chọn mức phóng đại càng lớn càng tốt. Khi phóng đại tăng, trường nhìn thu hẹp và vùng quan sát thay đổi. Với công việc sửa chữa, người dùng còn cần khoảng trống đủ lớn để đưa mỏ hàn, nhíp hoặc dụng cụ vào dưới vật kính.
A binocular model is primarily intended for direct observation and hands-on work through two eyepieces. A trinocular model adds an optical port for connecting a camera, allowing users to capture images or record videos for training, documentation, or research.
Pulse Counting in Automatic Packaging Machines: Distinguishing Between Double-Counting Errors and Actual Product Shortages
Worn bearings do not cause an immediate drop in the engine's average speed. What changes first is speed stability slight fluctuations in speed occur from one rotation to the next even though a standard tachometer continues to display a seemingly normal RPM reading. This is precisely what many people overlook. While the average figure looks fine, detecting instantaneous fluctuations reveals that the bearings had actually begun to develop play quite some time earlier
A practical overview of the ISO 12945-2 Modified Martindale approach for assessing textile surface pilling, fuzzing, and matting.
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