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An inductive comparator is desc ribed for measuring ra tio-co rrec tion·fac to r a nd phase·a ngle e rror of voltage transformers by com parison with refe rence tra nsformers. The s im ple c irc uit utili zes a res is tance-capacitance ne twork and a n induc ti ve vo ltage divide r. The re lative magnitude of the ratio· correction·factors is obtained from the dia l readings of the induc tive vo ltage divide r, and the phase angle between the voltage phasors is equal to ± wC R. The acc uracy of these meas urement s at 60 and 400 he rtz is within 2 parts-per-m illion for ra ti o and within 10 microradians for phase a ngle a t the limits of the phase·angl e range of ± 38 milliradians. O nl y a few ranges of refere nce transform e rs a re required s ince fractional ratios from 1/1 to 1/4 may be measured as readil y as ratios nea r unit y, without diminution in accuracy. A general discussion of a resis tive co mpa rator, which has bee n in con· tinuo us operation a t NBS s ince 1939, is included.

Comparators for voltage transformer calibrations at NBS