Posted by MarkB_MI on December 06, 2012 at 02:36:57 from (75.241.74.19):
In Reply to: Re: truck eletric drain posted by OLarry from MD on December 05, 2012 at 19:17:32:
>Nothing i use is digital.
OK, thanks for sharing that information. So what is the input impedance of your analog voltmeter?
Analog voltmeters don't have an input impedance spec, instead they have a "sensitivity" spec, which is given in ohms per volt. Your meter should have this value printed somewhere on the panel. But let's assume you have a cheap POS meter with a 10K ohm/volt sensitivity and you're using the 20 volt range. That gives an input impedance of 10K x 20 = 200 kilohms. So if you're reading two volts, the current is 2 / 200K = 10 microamps.
Holy Toledo, you better do something about that! At ten microamps, your battery will be dead in 1142 years!
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