Quote:
Originally Posted by Bernie Wolfard
Arct1k,
You cannot measure the amount of resistance with a standard multimeter it is too low. Even though it is low, it is significant because resistance goes up with the square of amperage.
To measure very low resistance values you put a set amount of amperage, say 10 amps, accost the part being measured with a lab quality power supply then measure the voltage accost the part with a voltmeter accurate to at least ten thousands of a volt. Then use Ohm law to calculate the resistance, ohms = volts / current. I don't know how to measure internal resistance or a battery but obviously this method will not work with them.
Artur, I think Patrick, Castle Creations owner and chief engineer explained why tantalums are not appropriate for these applications, one of these being they can explode from the amount of inrush current we get in these applications. Patrick is a systems engineer who has a long resume including being lead engineer at Garmin, Allied Signal and others.
Bernie
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:)
You can do the same measurements with batteries as with caps.
BrignG - You need to have something as precision reference.
P.S. Resistance also would be temp and current dependant not to mention vibration...