The most common application of PCB/FPC wired near-field communication (NFC) applications is the induction coil printed on the inner layer of mobile payment cards. The printed coils may make contact with each other and result in micro-short circuits due to poor silver printing processes which, in turn, lead to poor induction in terminal products or even induction failure and data communication interruption.

PCB coil micro-short circuit meter 933 is a non-destructive tester. By applying voltage at both ends of the coil, this resonates a cluster of energy by induction and capacitance charging and discharging. We then use the waveform from release to attenuation to analyze the PCB coils for its insulation, induction amount, and parallel connection-based capacitance change to control micro-short circuiting in coils caused by the production process.