On 1/16/07, Daniel Schouten wrote: > Thanks Sean. > > That has crossed my mind as well. However, building a very accurate 10 Amp > current source is not that easy and consumes too much engineering time. > Buying a very accurate 10 Amp current source might cost much as well. I > haven't found any yet, only a 100mA max. unit from Keithley (6220). I am > waiting for a quote on this unit, but I guess it will not be cheap. > > Daniel... > The current source doesn't have to be accurate, just measurable. That is, just put a precision shunt in series with it. Here's a suggestion: Use a standard AT/ATX computer power supply, which can provide 10A on the 5V rail, no problem. Use a 0.5 ohm, 50 watt (minimum) resistor in series with a 0.1% precision shunt resistor and the device under test. Measure the voltage on the precision resistor to get the actual current, then measure the voltage across the device under test. Ohm's law does the rest. The whole setup will be about $100. Regards, Mark markrages@gmail -- You think that it is a secret, but it never has been one. - fortune cookie -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist