https://devzone.nordicsemi.com/f/nordic-q-a/122292/ppk2-current-meter-testing-methodsIs a common ground required when measuring current in current meter way? Can externally supplied voltage exceed 5V? Will this cause inaccurate test results?en-USTelligent Community 13Tue, 17 Jun 2025 11:40:16 GMThttps://devzone.nordicsemi.com/thread/539531?ContentTypeID=1Tue, 17 Jun 2025 11:40:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2dc3f4fa-ceee-47b7-a55d-641104f844d6SwRa<p>Hello,</p> [quote user=""]Is a common ground required when measuring current in&nbsp;current meter way?[/quote] <p><span>Yes, a common ground is required. The PPK2 GND must be connected to the ground of the Device Under Test (DUT) and the external power supply. This ensures accurate current measurement and proper operation of the measurement circuit. This has been discussed in other threads like this:&nbsp;&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/105202/using-power-profiler-2-for-measuring-current-of-my-custom-pcb-with-nrf52832">Using Power Profiler 2 for measuring current of my custom PCB with nrf52832</a>&nbsp;&nbsp;</span></p> [quote user=""]Can externally supplied voltage exceed 5V? Will this cause inaccurate test results?[/quote] <p>No, the externally supplied voltage must <strong>not&nbsp;</strong>exceed 5V. The recommended voltage range for the external supply in Ampere Meter mode is 0.8V to 5.0V. Supplying a voltage above 5V can damage the PPK2 or cause inaccurate measurements. The voltage is applied directly to the circuits without regulation, so exceeding this range is not supported and may result in incorrect or unsafe operation. Refer:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ug_ppk2/page/UG/ppk/ppk_power_supply.html">https://docs.nordicsemi.com/bundle/ug_ppk2/page/UG/ppk/ppk_power_supply.html</a>&nbsp;</p> <p><span>Best Regards,</span></p> <p><span><span>Swathy</span></span></p><div style="clear:both;"></div>