Research on verification method of AC low voltage meter

摘要

Application of AC low-voltage technology is introduced in this paper, and the essentiality of AC low voltage''s verification is indicated. Respective discussed some methods applied in AC low voltage meter verification, include method of resistance divider, method of inductive divider, method of AC-DC transfer and method of standard source. Principle and actuality development of those four methods be expatiated. At the last the characteristic and specification of an AC low voltage standard source is introduced, this instrument manufactured by our Institute, which consist of 10V voltage reference, 7-bit programmable decimal divider, sine wave generator and low noise programmable divider, voltage reference be used to change amplitude of standard output, sine wave generator be used to output AC voltage signal, low noise divider be used to generate AC low voltage, uncertainty is 120×10⁻⁶ mV at 10 mV 1 kHz.