The toughest faults to find are the ones that materialize only Occasionally—intermittent occasions. They may be because of lousy connections, dust, Filth, corrosion or simply broken wiring or connectors. trong m?t kho?n th?i gian nh?t ??nh tr??c khi ?i?u ch?nh, t?t nh?t b?n nên dùng ph??ng pháp t? ??ng ho?c xây d?ng hàm ?? ki?m tra v?i d? l