Static conductivity tester

Claim 1

A tester for comparing the resistivity or conductivity of an elastomeric article against a predetermined standard to determine its suitability for a specific application, said tester comprising: a direct current voltage source capable of supplying the tester with a source electrical potential; means for flowing the electrical current of the testing device through the elastomeric article to be tested; switching mechanism circuitry with multiple settings that provides a means for selecting one of the settings, each setting selected to trip a switch within the switching mechanism circuitry that corresponds to a particular configuration of electrical components to correspond to a type of test; wherein at least one setting is capable of checking the source electrical potential of the direct current voltage source so that the output indicator will indicate "pass" if the direct current voltage source is holding a voltage sufficient to supply the tester with the source electrical potential necessary to allow the tester to test the elastomeric articles against the predetermined standards; a comparator network comprising two direct current differential-input comparator amplifiers, each amplifier having a first inverting and second non-inverting input terminal and an output terminal, wherein each of the first inverting input terminals is connected to a reference branch circuit comprising at least one known resistance and the source electrical potential, and wherein each of the second non-inverting input terminals is connected to an input test branch circuit comprising the source electrical potential, the switching mechanism, and the means for flowing the electrical current; the comparator network serving to compare the potential generated from the reference branch circuit with the potential generated from the input test branch circuit; and an output indicator comprising a "fail" indication means connected to one of the two comparator amplifiers by way of its output terminal, and a "pass" indication means connected to the other one of the two comparator amplifiers by way of its output terminal; the output indicator to indicate "pass" when the potential generated from the input test branch circuit exceeds the potential generated from the reference branch circuit, and the output indicator to indicate "fail" when the potential generated from the reference branch circuit exceeds the potential generated from the input test branch circuit.