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[Two designs of t hin ribbon resistors have been devised which a rc sui table for hi gh-voltage surges and have very low t ime constan ts (2X 109 sec) . They were used in mak ing up dividers for measuring linearly rising chopped impulses wi th peak voltages up to 300 kilovolts a nd t imes to spark over from 0.03 to 50 microseconds. Errors in divider ratio due to residual inductance were found by computation t o be less t han 1 percent. Stray cap acitance errors were kept low by making total divider resistan ce 1,000 ohms or less. By a combination of computation and experimentation, capacitance errors were deduced to be not greater t han 1 percent for t imes to sparkover 0.1 microsecond or greater. A la rge number of oscillograph records were obtained of spark-gap flashove r voltage wit h linearly r ising voltage impu lses at rates of ri se up to 10,000 ki lovolts per mi crosecond. F rom t hese oscillograms data were deri ved giving a relat ion betwecn rate of rise (or rise tim c) a nd flashover voltage for (1) 12.5-cm-dia mcter spheres spaced 6 cm a part, (2) 25-cm-diameter spheres spaced 6 cm, a nd (3) 6.5-inch-diameter uniform fi eld electrodes spaced 5 cm. Voltt ime curves showing these relations were plotted. It is reeo mme llded t hat the curve fo r 25-c m-diameter spheres be used as a refcrence standard for inte rlaboratory compariso n of measurement methods.

Spark-gap flashover measurements for steeply rising voltage impulses