I have a DC electronic system that takes approx. three minutes to boot up, and I have to decide what gauge wire to make power cables. During boot up, this system powers on several different sub-systems, cooling fans, LCD display, processor etc... each producing their own current spike. With what tool can I measure max inrush current (amps rounded to .5) over approx 3 minutes?
A Tektronix scope with a current probe. Most of the newer tek scopes can measure in the minutes range. If you needed to catch a spike you could trigger. Othwise set it into roll mode and integrate over 3 minutes. You do need to be able to do a calibration on the scope and back convert voltage (on the scope) back to current.