Engineers may face a challenge when designing low current measuring circuitry for pin leakage and isolation resistance. In consumer electronics, low pin leakage can reduce power dissipation. In power modules such as 110VDC railway applications or 1200VDC PV (photovoltaic) applications, there could be direct physical and electrical damage without isolation, so it’s generally necessary to strengthen the isolation. Current is required to achieve this higher isolation resistance and lower leakage. This presentation will discuss design considerations for measurement, including a circuit concept for circuit design, component selection that avoids affecting the performance of your circuits, and PCB design techniques for a circuit’s performance.