Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With amplifier or space discharge device
Patent
1974-10-31
1976-08-10
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With amplifier or space discharge device
324119, 324126, G01R 130, G01R 1504
Patent
active
039744450
ABSTRACT:
A portable kilovoltmeter especially suited for measuring the secondary voltage of an ignition coil includes an operational amplifier whose input is connected via an input circuit to the ignition coil secondary winding and whose output is connected via an output circuit to a galvanometer on which the secondary voltage is read. The input circuit to the operational amplifier includes a probe which forms a portion of a capacitive voltage-dividing network via which the secondary voltage is reduced in amplitude before it is supplied to the operational amplifier input. The probe includes a capacitive probe element which makes contact with the hot terminal of the ignition coil secondary and a length of high-tension, high-resistance conductor which leads from the probe element to the console containing the galvanometer and the kilovoltmeter circuitry. The input circuit further includes filters and dropping resistors to filter and further drop the secondary voltage before it is supplied to the operational amplifier input. A switch means in the input circuit selects either positive or negative polarity portions of the secondary voltage for input to the kilovoltmeter. A switch means in the output circuit selectively connects the galvanometer with the operational amplifier output so that the galvanometer can indicate the magnitude of whichever polarity of secondary voltage is selected by the switch means in the input circuit.
REFERENCES:
patent: 2255502 (1941-09-01), Bousman
patent: 3045199 (1962-07-01), Shobert
patent: 3300713 (1967-01-01), Fulton
patent: 3617881 (1971-11-01), McCormick
patent: 3829774 (1974-08-01), Cerveny
Crouch Thomas J.
Hait Larry G.
Karlsen Ernest F.
Merc-O-Tronic Instruments Corporation
Rolinec R. V.
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