Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-10-09
1976-06-15
Mullins, James B.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 62, G01R 3102
Patent
active
039639819
ABSTRACT:
A leakage and continuity test unit for checking the ground impedance and leakage current in a medical instrument to ensure that the medical instrument is properly grounded and does not conduct an excessive amount of leakage current through the chassis. The unit includes a test probe which is interconnected with the equipment under test, the unit including a continuity circuit having a comparator which compares a fixed voltage with a voltage representative of the impedance to ground of the equipment under test. The output of the comparator is fed to a flip flop circuit which, when an excessive amount of ground impedance exists, drives a warning lamp circuit. If the impedance is below certain set limits, the flip flop will drive a lamp which indicates that the ground of the equipment under test is proper. The unit also includes a leakage detector circuit which includes an upper and lower limit control circuit which establishes different standards for the equipment under test depending on whether the equipment is to be used in critical service or general service areas within the hospital. The leakage signal is fed through a precision rectifier which in turn feeds the signal to a dual input comparator which dual input comparator is capable of testing either a positive or negative signal. The output of the comparator is fed to a flip flop circuit which drives a set of lamps, one of which warns the user that an excess of leakage current exists and the other of which indicates to the user that the leakage current is within the limit set by the gain control circuit.
REFERENCES:
patent: 3697808 (1972-10-01), Lee
patent: 3700966 (1972-10-01), Morrow
patent: 3784842 (1974-01-01), Kremer
J. M. Richards Laboratories
Mullins James B.
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