English 
Italiano 
We used EFISH to measure the electric field evolution of a 200 ns pulse, dielectric barrier, plane-to-plane discharge in humid air. ICCD detected a uniform evolution of the discharge emission during the breakdown. Spectroscopic measurements tracked the N2 second positive and first negative systems to infer the E/N evolution. EFISH measurements showed the electric field persistent during the entire HV pulse, with the residual field between pulses and the field inversion at the start and end of the HV pulse. Experimental data are consistent with simulations, with electron attachment and negative ion kinetics incorporated. Spectroscopic E/N determination showed time evolution at variance with the EFISH measurements, which may be due to the non-locality of the EEDF. Possible explanations will be discussed.
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