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| Searching for some precision mains power meter (0.1mA) |
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| kripton2035:
Hi folks, I experimented some affordable power meter like a kill-a-watt or some chinese modules they are not precise enough for what I want to measure; some modules I make that need less than 1mA current some of the meter I tried had a 1mA resolution, but did not in reality measure anything below 5mA ... do you know a power meter that could measure mains (220v) at a precision of 0.1mA (or less) and that does not cost an arm ? ordo I have to make my own using some ADE77xx chip ? thanks for any hint(s) have a nice day, and an happy new year ! |
| _Wim_:
Hi, what is the max current it must be able to measure? If only low max currents are required, you could just increase the current sense resistor in those power meters to a 10x value and divide the result by 10. Some power meters allow you to attach your own current sense resistor and configure its value in software (like my Voltech PM6000) |
| kripton2035:
I would like to still be able to measure up to some 1-5 A ? |
| _Wim_:
--- Quote from: kripton2035 on January 01, 2023, 09:12:25 pm ---I would like to still be able to measure up to some 1-5 A ? --- End quote --- Measuring 0.1mA on a 5000mA range will be very hard (impossible?) for even a very very expensive power meter. Thats 50000 counts (almost 16 effective number of bits) that needs to be measured at high speed and fully isolated! I would first check to see what high end meters from Yokogawa and the likes can offer here and adjust your requirements accordingly. |
| 1audio:
I would suggest searching for a Clark Hess 255 power meter. https://manuals.repeater-builder.com/te-files/MISCELLANEOUS/CLARKE%20HESS%20255%20Instruction.pdf It can measure down to 5 mA full scale and has bandwidth to 300 KHz with better than 1% accuracy. Accuracy on distorted AC is a challenge and these are among the better instruments. There are several on eBay, the cheapest is around $75. |
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