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US 5,489,841 AGranted
Multimeter for measuring various measurable variables
AssigneeABB Patent GmbH
InventorDieter Henkelmann
Life of this patent
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AssigneeABB Patent GmbH
InventorDieter Henkelmann
Estimating the term…
A method for measuring various measurable variables with a multimeter includes specifying one of a plurality of measurable variables to be determined through a position of a measurement range switch and/or through a selection between various input connections respectively assigned to the measurable variables. Input circuits are assigned to respective measurable variables. A preliminary test is performed for at least one of the measurable variables to check if an input circuit is suitable for picking up an applied test signal, before an actual main measurement is carried out. A given input circuit is enabled for picking up the test signal only if the preliminary test has shown that the test signal is suitable for the given input circuit. An error signal is issued if a test signal being unsuitable for the given input circuit ensues. A multimeter for measuring various measurable variables includes a measurement range switch and/or various input connections for specifying a measurable variable to be picked up. Input circuits are each associated with a respective one of the measurable variables. At least one input circuit switch in at least one of the input circuits is open in a position of repose and is switched on for measurement only if a test of the test signal has shown that one of the input circuits to be switched on is suitable for picking up a test signal from a test object.
A multimeter for measuring various measurable variables, comprising means for specifying a measurable variable to be picked up, input circuits being connected to said measurable variable specifying means and each being associated with a respective one of the measurable variables for picking up a test signal from a test object, means for testing the test signal as to whether or not a respective one of said input circuits is suitable for picking up the test signal for obtaining an actual measurement;
A multimeter for measuring various measurable variables, comprising means for specifying a measurable variable to be picked up, input circuits being connected to said measurable variable specifying means and each being associated with a respective one of the measurable variables for picking up a test signal from a test object, a pair of input terminals for connecting two test leads to said input circuits, said pair of input terminals being suitable for picking up test signals for any of voltage, resistance and current measurements, means for testing the test signal as to whether or not a respective one of said input circuits is suitable for picking up the test signal in an actual measurement and at least one input circuit switch in at least one of said input circuits being open in a position of repose and being switched on for measurement only if a test of the test signal by said testing means has shown that one of said input circuits to be switched on is suitable for picking up the test signal for obtaining an actual measurement.
Dependencies are inferred from the claim text.