QUOTE(mfa333 @ Jun 12 2007, 09:58 AM)
Watts consumed by digital multimeter = less than 1 watt I take it you mean use the digital multimeter to check PC wattage use. Yes, its possible, set to AC current measurement, then measure the current taken by the PSU and multiply it by 230 (or if you want to be so damn accurate, measure the voltage and use that instead). Perfect accuracy can be achieved if you're using a active PFC psu and a sine wave digital multimeter, but the accuracy of a normal digital multimeter is still pretty ok with an active PFC psu. With non active PFC psu, readings might not be accurate because you have to account for the phase shift in the current, which is pretty hard to measure using easily available equipment.
PS : to measure current you'll have to cut one of the AC power wires and put the multimeter in connected to both cut ends of the cable. DO NOT ever connect the multimeter directly to Live and Neutral on AC while in Ampere (current) measurement mode, if you're lucky you'll just blow the multimeter's fuse, if not you'll see smoke coming from the multimeter.
Jun 12 2007, 06:48 PM

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