Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-06-26
1976-11-16
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2700
Patent
active
039926656
ABSTRACT:
Apparatus for measuring the electrical impedance of a variety of materials including an electrode arrangement providing sample data to an impedance bridge, a frequency generator providing a test signal to the impedance bridge, the impedance bridge including a transformer having three separate windings, two of which are highly symmetrical to each other and all three of which have an impedance below 10,000 ohms, and four resistors having resistance values differing from the impedance of the transformer windings but comparable to the unknown impedance, two of the four resistors connected to each of the two symmetrical windings of the transformer. Output devices for displaying the electrical impedance are also disclosed. In one embodiment, a sample box useful in the measurement of the electrical impedance of bulk materials including novel means for mounting an electrode therein is disclosed. Also disclosed in another embodiment is apparatus useful for measuring the electrical impedance of thin sheet material including novel mechanical thermal compensation means.
REFERENCES:
patent: 2204196 (1940-06-01), Straatman
patent: 3081429 (1963-03-01), Moe
patent: 3566260 (1971-02-01), Johnston
patent: 3691457 (1972-09-01), Kriellaars
patent: 3731187 (1973-05-01), Hausler et al.
patent: 3761810 (1973-09-01), Fathauer
patent: 3794911 (1974-02-01), Fathauer
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