Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With amplifier or space discharge device
Patent
1976-11-03
1978-01-03
Mullins, James B.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With amplifier or space discharge device
324 51, 324 60C, 324 62, 324133, 324149, G01R 130, G01R 3102
Patent
active
040669530
ABSTRACT:
An electrical testing instrument including an amplifier circuit having a pair of inputs, one comprising a probe and the other being adapted for manual engagement by the user for completing an input circuit through the body of the user. The circuit has a battery and a current-responsive indicator in its output circuit to provide a signal when current flows in the input circuit to provide a critical forward biasing of the amplifier. The battery is connected to furnish such input current when the input terminals are connected in a closed circuit having a resistance of at least approximately the resistance of the user's body. The amplifier circuit is further arranged that when the probe is contacted with a live AC power line and the manually engageable input terminal is so manually engaged, an operating indicating current will also be present in the output circuit.
REFERENCES:
patent: 3328684 (1967-06-01), Dorris
patent: 3412327 (1968-11-01), Murray
patent: 3437928 (1969-04-01), Baker et al.
Gold Lawrence
Mullins James B.
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