Hand held testing device for measuring different electrical quantities

Claim 1

A hand held testing device having means for selecting independently one of several functions and one of several ranges, respectively, for measuring different electrical quantities within a wide range of magnitudes, comprising in combination: (a) a first handle, a second handle and a cable connecting the two handles, each of said handles being provided with a hollow body for accomodating electrical units and with a test prong for contacting a respective measuring point; (b) a function selecting switch and a range selecting switch both arranged on said first handle; a first printed circuit board assembly mounted within the body of said first handle and carrying two separate groups of contacting areas assigned to said function selecting switch and to said range selecting switch, respectively; each of said switches further having a switch frame and movable contact elements arranged in parallel thereon and being movable in common and stepwise, between different selector positions, in the direction of the long axis of said first handle, and when in a selector position, being in close contact with respective neighboring contact areas; each of said switch frames having a finger grip element extending through said first handle body at opposite sides for manual operation of the respective switch; (c) two selector areas arranged side by side and between the two finger grip elements on one surface of said first handle, the first selector area marking selector positions of said function selecting switch and the second selector area marking selector positions of said range selecting switch; (d) a semiconductor display device mounted in said body of said first handle, and having a display area arranged to be visible through the body of said first handle on the same side of said first handle as said selector areas; (e) a second printed circuit board assembly mounted aside said first printed circuit board assembly in said body of said first handle and electrically connected to said first printed circuit board assembly, said second printed circuit board assembly carrying measurement processing circuit arrangements on one surface and means for connecting the display device to outputs of said measurement processing circuit arrangements arranged on the opposite surface; and (f) a chargable voltage source unit and means for charging the same built into said second handle.