Open AccessPrecision DC Voltage Reference - Metrology Laboratory Report
Author(s) -
G.E. Kater
Publication year - 1978
Language(s) - English
Resource type - Reports
DOI - 10.2172/1059956
Subject(s) - voltage , resistor , voltage divider , ohm , metrology , direct current , electrical engineering , voltage reference , current (fluid) , voltage source , physics , engineering , optics
A precision dc voltage reference has been constructed to serve as a driver for a regulated direct current source used in the callbration of ammeters, resistors, and shunts. Variable output voltages are generated by dividing the output of a 10-V supply (CODI Semiconductor Inc. Model PVS10CA) to a nominal 0.16 and 1.6 V, selected by range switching. These voltages are applied to the input of a 320-k{Ohm}, six-decade, Kelvin-Varley divider, the output of which is used to drive the regulated direct current source. Provision has been made for precision adjustment of the input voltages to the Kelvin-Varley divider. The resolution of the output voltage is 0.625 ppm of full scale, with an estimated uncertainty of {+-}50 ppm of the setting or {+-}10 {micro}V, whichever is greater. The voltage reference is easy to use, and it has improved measurement accuracy