Multimeter having an erroneous input prevention mechanism

Details Multimeter having an erroneous input prevention mechanism Multimeter having an erroneous input prevention mechanism

1996-01-18

1997-04-08

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

324 7611, 324110, G08B 2100, G01R 2316, G01R 1512, G01R 100

Patent

active

056191294

ABSTRACT:
A multimeter is provided having an erroneous input prevention mechanism that allows more than one mode to be assigned to an input terminal hole located in a central section of a shutter board based on movement of a rotary switch. When the rotary switch is rotated, the first and the second drive-side protrusions formed at separate locations from the selector push away the first or second slave-side protrusions in the slave shell to rotate the shutter board about the center at the negative common terminal hole. Thus, only a specific terminal hole is in the open state. Even when the rotary switch is rotated to a predetermined position, the shutter board does not rotate to leaving the first input terminal hole in the open state.

REFERENCES:
patent: 5166599 (1992-11-01), Hochreuther et al.
patent: 5243275 (1993-09-01), Nakazawa et al.
patent: 5442337 (1995-08-01), Hwang

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