AC-DC difference comparison measuring device and the AC-DC difference comparison measurements using this

摘要

PURPOSE: To keep the constant atmospheric temperature of an apparatus for comparing and measuring the difference between AC and DC for precise measurement of low-frequency AC voltages and currents, to improve measuring accuracy and to make it possible to miniaturize and simplify the apparatus. ;CONSTITUTION: In an apparatus for comparing and measuring the difference between AC and DC, a plurality of standard devices for the precise measurement of low-frequency voltages and currents are connected in parallel. Thus, the measuring circuits are formed. Of these measuring circuits, at least a plurality of standard devices 4a, 4b,...4f are embedded in an aluminum block 1. A heat pipe 2 is provided at the central part of the aluminum block 1.;COPYRIGHT: (C)1993,JPO&Japio