Combination Waveform Generator : A surge generator with a 2-ohm internal impedance producing a 1. 2/50 s open circuit voltage and an 8/20 s short-circuit current waveshape
NFPA 780 Standard for the Installation of Lightning Protection Systems, 2008 ed. http://www.uscg.mil/Petaluma/TPF/ET_SMS/Manuals/NF PA_780.pdf, (Std: Instll of Lightning Prot Sys - Amer) {347 NFC}