Zero-setting device for electrical measuring instrument and method for raising air breakdown-resisting voltage value of electric measuring instrument
A technology for electrical measuring instruments and breakdown voltage, which is applied to the parts, instruments, and measuring electronics of electrical measuring instruments, and can solve the problems of failure to meet safety standards and small resistance to air breakdown voltage of electrical measuring instruments.
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[0022] One of the present inventions relates to a mechanical zero adjuster for electrical measuring instruments.
[0023] The mechanical zero adjuster 2 of the present invention is installed in the electrical measuring instrument, as shown in Figs. , Mechanical zero adjuster 2, shell 4.
[0024] As shown in FIGS. 4( a ) to ( b ), the zero adjuster of the present invention includes an eccentric shaft 22 and a disk surface 23 , and the eccentric shaft 22 is eccentrically connected to the disk surface 23 through a connecting piece 24 . The whole zero adjuster 2 is in the shape of a disk with a thick center and a thin outer edge.
[0025] As shown in FIG. 6 , the disk surface 23 is sandwiched between the plexiglass cover 5 and the casing 4 of the electrical measuring instrument.
[0026] The center of the disc surface 23 is provided with a stud 21 exposed in the middle of the surface of the shell 4 with a "one" groove, and the user can easily rotate the zero adjuster by 360° wit...
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