On Fri, 08 Jul 2005 15:10:39 -0700, you wrote: >how hard can it be to just put an analog ammeter on the battery
Naudin states he uses an "Analog Voltmeter and Ammeter with a high current shunt." It's trickier than you would think because that analog ammeter and shunt still has to pass 166 A with minimal voltage drop, and yet have a reasonably accurate indication at 400 mA. With an appropriate shunt to go full scale at 166 A, the needle will barely move at 400 mA. And analog meters tend to be inaccurate at low scale readings. You could use a 500 or so mA at full scale ammeter and a big capacitor (one side to ground) after the meter. Add a big inductor between the meter and cap for a touch more accuracy. And nothing wrong with putting a scope across a low ohm shunt and measuring the pulse and calculating the power. Unless you miscalculate... Brad
