https://devzone.nordicsemi.com/f/nordic-q-a/105876/ppk2---voltage-drop-between-input-and-output-in-ampere-modeHi, I tried to measure the current consumption of a system that consist of a supercapacitor supplying a MCU. I placed the PPK2 between the supercapacitor and the MCU to measure the current consumption of the MCU and found out that the voltage is differenten-USTelligent Community 13Tue, 21 Nov 2023 14:52:38 GMThttps://devzone.nordicsemi.com/thread/456725?ContentTypeID=1Tue, 21 Nov 2023 14:52:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:80ca4b1f-8a82-4f13-a09a-2701ce1b1435PaKa<p>No, the ranging is automatic in HW. You should never see a drop that large as that would impact the application. The system should swap the resistance to keep the drop inside a predefined range. With 1A/51mOHMs I am tempted to say between 0V and 51mV. If you have damaged some of the circuitry inside then the switching may fail.</p> <p>Not had any ESD issues, high inrush currents (above 1A) or done hot swapping of power sources?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/456641?ContentTypeID=1Tue, 21 Nov 2023 10:51:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f39846db-99b8-4b89-a7d2-9c92e9c9e74cabernabeu<p>Hi,&nbsp;</p> <p>Thank you for the answer. Yes, the 110 Ohms must be the problem. Is there a way to force the resolution of the current measurement ? Within the&nbsp;power profiler from the nrfConnect app, I can&#39;t find any option that will modify the resolution.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/456531?ContentTypeID=1Mon, 20 Nov 2023 18:01:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e3e6565f-14ab-4f0f-b556-0942bf1b7230hmolesworth<p>Not sure if this is what you are looking for, but depending on the current range there is a series resistor between the supercapacitor and the DUT which will drop V=IR volts. The series resistor R is low (51 mOhm) for high current, but large (110 Ohms) for lowest current measurements. I made these notes from the original PPK-2, it may have changed since then. Reduce the voltage drop by&nbsp;selecting a coarse measurement range on the PPK2.</p> <p><pre class="ui-code" data-mode="c_cpp">// Resistor Rc for current sense is 1k0 in parallel with one or more of 110R, 11R0, 1R0 and 0R051 // // &lt;- +ve Supply to DUT From VOUT External Battery +ve To VIN // +------------------------------+ +-----------------------+ // | | | | // | +---------+ | | +---------+ | // | | GND | | VOUT VIN | | GND -ve | | // +=========O=========+ | +====O=====O=============================O=====O====+ | | Battery // | Vdd (+) | | | | #----+ | | | | | + 3 volts // | | | | | | |Rc AMPERE \ | | | | +-O-+ // | | | | | | +++ \ | | | | | | // | | | | | | | | +-----------O O----# | | | | | // | Device Under Test | | | | | | | | | | | | | | // | DUT | | | | 120k| | | | |120k | | | | | // | | | | | +++ +++ | \ SOURCE +++ | | | | | // | | | | | | | | | \ | | | | | +-O-+ // | | | | | | | +----#--O O-- PPK LDO | | | | | | Gnd (-) // | | | | | | | | | | | +-------+ // | | | | | +++ +++ | | // | | | | | | | | | // | | | | | #-- VDUT VIN --# | | // | | | | | | Sense Sense | | | // | | | | | +++ +++ | | // | | | | | | | | | | | // | | | | | | | | | | | // | | | | | | | | | | | // | | | | | +++ +++ | | // | | | | | | 30k 30k | | | // | | | | +--#--+ +--#--+ | // | | | | | | | // | | | | ===== &lt;&lt;== Common Gnd ==&gt;&gt; ===== | // | | | | === (Common -ve) === | // | Gnd (-) | | | = = | // +=========O=========+ | +===================================================+ // | | PPK-II // +--------------+</pre></p><div style="clear:both;"></div>