Evaluation of Linearity Characteristics in Digital Voltmeters Using a PJVS System With a 10-K Cooler. - Michitaka Maruyama; Hikari Takahashi; Kenichi Katayama; Takahito Yonezawa; Takahiro Kanai; Akio Iwasa; Chiharu Urano; Shogo Kiryu; Nobu-hisa Kaneko (IEEE Trans. Instrum. Meas., 2015)