Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-10-04
1976-05-11
Kominski, John
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
136182, 320 48, 340249, G01N 2730, G01N 2746
Patent
active
039567206
ABSTRACT:
An instrument for measuring and testing wet cell storage battery charge levels including the total charge level and the charge level of individual cells. The instrument has an autopolarity feature and utilizes a diode rectifier circuit with a DC voltmeter connected across the terminals. Separate circuits may be selected to provide two voltage readout scales including a scale for measuring the total charge level and a scale for measuring the charge of individual cells. The device has unique conductive probes at the ends of the test leads, the probes being adapted for immersion in the electrolyte of the cells in order to measure the charge level of individual cells. The probes are also used to provide electrical contact across the battery terminals for the total charge test. The probes are elongated steel rods coated with cadmium plating and having the outer ends ground off so that a roughened steel end surface is exposed to the electrolyte.
REFERENCES:
patent: 2922104 (1960-01-01), Godshalk et al.
patent: 3060374 (1962-10-01), Strain
patent: 3349322 (1967-10-01), Lowe
patent: 3879654 (1975-04-01), Kessinger
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