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Subject: Re: How can I convert AC voltage to DC voltage?
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Date: 01/23/01 at 8:20 PM
Posted by: Arthur
In Reply to: How can I convert AC voltage to DC voltage? posted by Hugh on 05/17/00 at 7:37 AM:
The problem of AC power monitoring is more difficult than it may seem. AC current and AC voltage must be measured separately to be meaningful. The AC voltage could be anything, only by measuring the TRUE RMS current and RMS voltage can you then compute some Power Factors, i.e. power, apparent power, reactive power, etc... Your best option is to purchase an AC RMS voltage only monitor that outputs a porportional 0 to 20mA signal. Place a 125 ohm 0.1% 1/8Watt shunt resistor across the 0 to 20mA to make 0 to 2.5V dc . A 10K ohm 1/16W resistor should be placed in series after the shunt as a current limiter into your data logger. Search the internet for "energy monitor or power monitor".
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