Device to aid in the determination of ovulation in a female mamalian
First Claim
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1. A body voltage and temperature measuring instrument comprising:
- a housing which is sufficiently small to be held in a hand;
two electrical terminals on said housing which are accessible from the exterior of said housing;
a differential amplifier within said housing;
means coupling the input of said differential amplifier to said electrical terminals;
a first voltage ladder circuit within said housing coupled to the output of said differential amplifier;
a first plurality of output indicators on said housing which are visible from the exterior of said housing;
means coupling each of said output indicators to a separate rung of said voltage ladder;
a probe;
a temperature responsive element in said probe;
a second voltage ladder circuit within said housing coupled to said temperature responsive element;
a second plurality of output indicators on said housing which are visible from the exterior of said housing;
and means coupling said second plurality of output indicators to said second voltage ladder circuit.
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Abstract
A body voltage measurement circuit and body temperature measurement circuit are simplified to the point that they can be both included in a single low cost hand held package through the use of twin voltage ladder output circuits. The temperature and voltage measurements circuits are functionally joined together by virtue of the fact that the temperature probe of the temperature measurement circuit is used as a common mode rejection voltage reference for the differential amplifier in the voltage measurement circuit.
25 Citations
10 Claims
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1. A body voltage and temperature measuring instrument comprising:
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a housing which is sufficiently small to be held in a hand; two electrical terminals on said housing which are accessible from the exterior of said housing; a differential amplifier within said housing; means coupling the input of said differential amplifier to said electrical terminals; a first voltage ladder circuit within said housing coupled to the output of said differential amplifier; a first plurality of output indicators on said housing which are visible from the exterior of said housing; means coupling each of said output indicators to a separate rung of said voltage ladder; a probe; a temperature responsive element in said probe; a second voltage ladder circuit within said housing coupled to said temperature responsive element; a second plurality of output indicators on said housing which are visible from the exterior of said housing; and means coupling said second plurality of output indicators to said second voltage ladder circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification