CORRECT PHASE MATCHING BETWEEN CHANNELSPhase matching of the system is another critical issue.The errors induced in the system at PF = 1 are minimal.A power factor of 0.5 with a phase error as little as0.5 degrees will cause a 1.5% error in the power mea-surement.
Hi guys and gals,I hooked up the front end of my ADC to my oscilloscope and measured something interesting. Specifically, there appears to be a variable phase lag between the transformer for the voltage signal (ERA 0.08VA) and the current transformer (CR Magnetics CR8348-2500-N) as a function of load. Voltage always is lagging current. The phase lag ranges from ~ 1.32ms at a 40W load to 0.722ms lag with a 1340W load. Both loads have unitary gain, i.e. a 40W light bulb and a toaster. Is this normal?