Hi,
CRIO 9066,NI 9242,NI 9246 are used to measure 3 phase voltage and current from secondary of transformer.the development platform is FPGA.
Vrms,Irms,Power factor,Apparent power,Active power,Frequency has to be measured using FPGA.
To calculate Vrms value DC and RMS measurement is used in FPGA,but the requirement is to calculate RMS value with zero crossing (negative to positive transition) of voltage waveform.
if reset signal (of DC and RMS measurement.vi) is wired from Zero crossing.vi and number of measurement point given as 1000 the DC and RMS measurement.vi returns results randomly.sometimes its calculating other time its holding the previous value.
if reset signal (of DC and RMS measurement.vi) is not wired to zero crossing,number of measurement point given as 1000 ,RMS measurement.vi giving value continuously.sampling rate of NI 9242 and 9246 is 50 kilo samples/second
How to calculate RMS value (DC and RMS measurement.vi) using zero crossing of voltage waveform
