Multimeter with at least three input connections and means for p

Details Multimeter with at least three input connections and means for p Multimeter with at least three input connections and means for p

1991-09-03

1992-11-24

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural ranges, scales or registration rates

324116, 324157, 324110, G01R 1512

Patent

active

051665999

ABSTRACT:
In multimeters having a plurality of input connections there is a danger of the measuring conductors being incorrectly connected in such a manner that the setting of the measurement range switch does not correspond to the input connections to which contact is made. In order to avoid damage which may be caused by making an incorrect contact to the input connections, an electrically and/or mechanically acting disabling device is coupled to the measurement range switch for permitting a disabling of particular input connections. The disabling is carried out in such a manner that contact can always only be made to that input connection for receiving a test signal through the measuring conductors, to which a measurable variable is assigned that corresponds to the measurable variable set with the measurement range switch.

REFERENCES:
patent: 2288241 (1942-06-01), Holcomb
patent: 4604569 (1986-08-01), Tedd et al.
patent: 4632479 (1986-12-01), Jacobson
patent: 4733017 (1988-03-01), Wolfe-Taylor et al.
patent: 4952755 (1990-08-01), Engel et al.

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