A water leak detector can work perfectly with a wet finger on a bench and still miss a real leak under an appliance. The liquid may be less conductive, the enclosure may keep it away from the electrodes, or dried contamination may leave the board permanently reporting wet. Designing the sensing copper is therefore only […]
Read articleA percentage on an X-ray report is not a complete acceptance decision. An LED thermal-pad solder void review must identify the package, the inspected area, the image-analysis method and the product conditions that make the joint acceptable. Otherwise a supplier can measure exactly what was requested while the customer assumes that a different requirement has […]
Read articleA USB fixture is part of the circuit you measure. Its connector launches, copper, probes and ground connections can change the waveform before the oscilloscope records it. A useful USB 2.0 test fixture therefore starts with a defined measurement task, not a collection of convenient test pads. This guide explains how to specify an engineering […]
Read articleCamera sensor board power noise is a system problem: regulator behavior, distribution impedance, sensor operating mode and nearby loads can all contribute. Replacing a regulator without identifying the coupling path may leave the image unchanged. A useful investigation connects an electrical observation at the sensor to a repeatable change in image behavior, then verifies the […]
Read articleHVAC controller relay isolation is a system-boundary decision. Identify what each contact switches, which circuits are accessible, and what insulation function is required before selecting a relay footprint. A contact current rating, a coil-to-contact dielectric test and a PCB spacing rule answer different questions. None can be substituted for the other two. This article is […]
Read articleAn edge AI thermal interface is a mechanical, thermal and production design problem. A high conductivity number cannot compensate for the wrong gap, uneven contact or an enclosure that cannot reject the heat. Start with the accelerator’s permitted cooling surface, define the complete path to ambient, and validate sustained application performance inside the intended enclosure. […]
Read articleA USB PD power sequence is a state transition, not just a list of rail delays. Review what powers the controller before attachment, which path may conduct after attachment, when the system may consume the negotiated power, and how the board returns to a safe state after detach or a fault. The useful review deliverable […]
Read articleIn a conventional non-isolated boost converter, review the compact switching loop formed by the rectifier, high-frequency output capacitor and power switch return. Draw both switching states before routing. Then measure output ripple at a defined location with a controlled probe connection, so that pickup is not mistaken for converter behavior. This article focuses on an […]
Read articlePlace the shunt in the current path you actually need to measure, then route two dedicated sense connections from its specified sensing points to the amplifier. A short power path and a clean measurement path are separate layout requirements. Check both, and define when the ADC can sample a valid result during PWM operation. This […]
Read articleAn RTD transmitter PCB should preserve a known measurement circuit, not merely place an ADC close to a terminal block. Separate lead resistance, excitation, reference accuracy and thermal effects before routing. Then use dedicated bench experiments to find out which error source the board actually exhibits. Define the measurement before placing components Write down the […]
Read article