Recently I was using the Joulescope with a super capacitor between the scope and the given low-power circuit (with a battery as power supply) . The problem that I obtained is that measuring at the 18uA range (1111 ohm shunt resistor) will take up more then 3 hours to charge the capacitor (5τ = 5RC = 5* (1111+2*2.5)). This is not the problem, but forcing the Joulescope at the 18uA range ensures that the current draw stays 18uA for a long period of time, because the current draw is above this range for some time. Changing the current range (and also the shunt resistor) to the automatic mode makes the measurements too complex and fluctuating the whole time.
Is there any way to measure this setup properly? And how to deal with the super capacitor. It is working as a energy buffer, so in the end it won’t make a big difference for the battery lifetime.
Thank you for thinking with me