Zero-setting device for electrical measuring instrument and method for raising air breakdown-resisting voltage value of electric measuring instrument

Abstract

The invention involves the method that the electricity measures appearance to adjust zero machines and exaltation electricity to measure gauge to bear air to broke through an electric voltage value, adjusting zero machines to include partiality stalk and a dish noodles among them, lacking of impartiality stalk to pass to connect piece with a circle dish noodles to make to lack of impartiality a conjunction. Because the invention adjusts zero machines to establish a dish noodles, and clip to establish in the organic glass cover and outer shell of, and establish one to open a head of having the cave slot to nail in the middle of outer shell surface at circle the center of the dish noodles, user as long as use screw knife expediently 360 degree to revolve and should adjust zero machines, lack of impartiality stalk to arouse a direction piece or so swing, arouse to point a needle swing thus, attain to point needle to adjust zero of purpose. Bears air to broke through an electric voltage value for the sake of the exaltation moreover with satisfy new safety standard (request gauge generally at least bear to press 5500 volts above), direction piece and of outer shell which needs enlargement to take to give or get an electric shock a body climb electricity distance, also namely enlargement circle the diameter of the dish noodles, can raise to bear air to broke through an electric voltage value to match various the most strict safety standard.

Description

technical field [0001] The invention relates to an electric measuring instrument, in particular to a zero adjuster for the mechanical zero position of the pointer in the electric measuring instrument and a method for increasing the air breakdown voltage value of the electric measuring instrument. Background technique [0002] Such as figure 1 , 2 As shown, the adjustment of the mechanical zero position of the pointer in the traditional electric measuring instrument is realized through the guide 1 and the mechanical zero adjuster 2 . [0003] One end of the guide piece 1 is stacked on the middle position of the bracket 31 of the measuring structure 3 in the electrical measuring instrument, and the guide piece 1 and the bracket 31 are positioned and pivoted through the coupling piece 32, that is, the guide piece 1 is positioned relative to the bracket 3 And can do relative parallel rotation, again, this end of guide member 1 is fixedly connected with one end of balance sprin...

AI Technical Summary

Problems solved by technology

[0005] Due to the structure of the existing zero adjuster, the minimum air distance (i.e. creepage distance) from the recessed hole in the middle of the cover of the electric measuring instrument (for installing the screw head 21 of the zero adjuster 2) to the charged body of the measuring structure 3 ) is small, such as image 3 As shown, the direction of the thick line represents the direction of creepage, which makes the air breakdown voltage value of the electric measuring instrument small, which cannot meet the requirements of the new safety standard

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