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Best would be a direct DC meter; i've seen some meters that are like almost a full circle and the wires of the device you'd like to test go through the circle; anything that goes through is measured. Don't know what the exact name is for such a device, but i'm sure it will serve your purpose.
Generally SSD is 0.1-0.5W idle and 1-2W when stressed with I/O.
Hmm i would have expected that a DC meter would be more accurate than a wall-socket AC meter, especially since that would include your whole system and fluctuates alot; so makes it very hard to measure power used only by the SSD. What would be a good measuring device for his purpose?
There are some nice power consumption comparisons of SSDs on the web; the only real spikes are SSDs like OCZ Apex which uses several JMicron controllers in RAID0. High power consumption and still piss poor performance.
Some reviews disagree on the idle power usage of SSDs. Some quote the Intel as 0.6W idle others as 0.1W.
i've seen some meters that are like almost a full circle and the wires of the device you'd like to test go through the circle; anything that goes through is measured. Don't know what the exact name is for such a device, but i'm sure it will serve your purpose.
Current clamp: immensely convenient, but bad at measuring smaller currents (unless you spend the big bucks).
series ammeter: less convenient (you have to be able to break your circuit and insert the ammeter), but more accurate at lower currents.