Newbie level 6
i want to measure 220V ac voltage and 5-15A current using pic.for this i have to convert the voltage to 5V using a transformer.I need help in choosing a suitable transformer and other components that may be required.
i hope it...
Could you explain which CT transformer you use ? also current to volt coefficient of that (for measure current)
May do you show your circuit in forum
You can calculate the uncertainty introduced by sampling a sine voltage at 1 ms intervals without synchronization to the input signal. In addition, you must expect harmonics and interferences to affect the measurement. Did you check the input waveform?
By using a bridge rectifier, the measurement circuit will have a floating ground or a safety transformer is needed.
A filter capacitor in parallel to the 1 k resistor should reduce the voltage variation.
Harmonics can still involve a considerable deviation from true voltage measurements. Personally, I would expect a sampled measurement (preferably of AC input rather than full-wave rectified voltage) for a RMS and PF or real power measurement. But a sampling intervall of 1 ms would be somewhat slow for this purpose.This could be one way to avoid a capacitor. (...)
You can calculate the uncertainty introduced by sampling a sine voltage at 1 ms intervals without synchronization to the input signal...