Thermal Profiler Setup: Getting a True Reflow Reading A thermal profiler records the temperature history that a board actually experiences, and the value of that record depends entirely on how the sensors were attached. A reading taken beside a pad instead of on it, or routed so that heat drains…

PCB Statement of Work Timing: How Long It Takes Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB statement of work timing gives you a practical…

Laminate Moisture: 4 Checks Before the Press Cycle Laminate moisture is the water that a core or a sheet of prepreg holds inside it, and it has no place in a press cycle. When the stack is heated, that water turns to steam, and the steam has to go somewhere:…

Pogo Pin Fixtures: Contact Resistance and Maintenance A pogo pin is a spring loaded contact that presses a probe tip against a test point, and a bed of nails fixture holds hundreds of them in a plate that is lowered onto the board. Every measurement the fixture makes passes through…

Busbar Contact Resistance: 4 Checks for Even Plating Current Current leaves the rectifier through copper busbars, crosses a series of bolted and clamped joints, and enters the tank through the rack hooks. Every one of those interfaces has a resistance, and the sum of them decides how much of the…

Solder Mask Ink Viscosity: 4 Checks Before Screen Printing Ink viscosity is the property that decides how a solder mask behaves as it passes through the screen. Too thick and the ink will not flow into the openings; too thin and it bleeds under the emulsion, closing the fine clearances…

PCB Statement of Work Handover: Passing It On Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article explains…

Solder Mask Spray Coating: 6 Rules for Even Films Solder mask spray coating builds the protective film by atomizing liquid ink and depositing it on the panel surface, layer by layer, instead of pushing it through a screen. It is chosen where the copper is tall, the features are dense…

Poka Yoke in PCB Assembly: 7 Devices That Stop Mistakes A poka yoke is a device or a rule that makes a mistake impossible to commit, or impossible to pass on unnoticed. The term comes from Japanese manufacturing practice, and on a PCB assembly line the idea is simple: rather…

PCB Statement of Work Specification: Writing It Down Precisely Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article…