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AssigneeABB Patent GmbH
InventorsKarl Hochreuther, Gunter Roppelt, Herbert Ziegler, Robert Kindermann, Horst Hopfner
Estimating the term…
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.
A multimeter, comprising at least three input connections assigned to measurable variables for receiving two measuring conductors in a position for determining one measurable variable and for receiving at least one of the measuring conductors in another position for determining another measurable variable, a measurement range switch to be moved between switch setting positions assigned to the measurable variables, and a disabling device coupled to the setting positions of said measurement range switch for selectively operatively disabling said input connections and permitting said input connections to receive only one of the measuring conductors carrying a test signal corresponding to a measurable variable set with said measurement range switch.
Dependencies are inferred from the claim text.