Abstract: The transfer of the temperature of a body to a fertility calculator (7) is only authorized by the time controller (20, 23) when a first counter shows that a first preselected period of time (e.g., 22 hours) has elapsed since the previous temperature measure and when a second counter (23) shows that the temperature is being taken during a second preselected time interval (e.g. 4 hours) following the first period of time. Accordingly, only one measure can be made per day at approximately the same time, thereby eliminating the important problem encountered when the temperature is taken at irregular intervals.

Abstract: An electronic thermometer comprises a temperature sensitive resistance element to be placed in contact with the area of which the temperature is to be measured. A first relaxation oscillator to which the resistance element belongs, provides a frequency depending on the temperature to be measured. A reference oscillator provides a reference frequency. The first frequency is counted in a counter during a period provided from the reference frequency by a divider. If a temperature or power supply drift affects the reference frequency, the same drift affects in the same direction the counted frequency, so that during the counting the effect of the drift is substantially cancelled. A memory and a comparator record the result of the counting only if it is higher than the preceding result, so that the thermometer operates as a maximum thermometer. The recorded result is provided to a decoder which controls a display device.

Abstract: The present invention is intended to solve the problem of the reliable acquisition of accurate temperature data for a miniature calculator provided for the application of family planning methods. The calculator is provided with a receptacle removably carrying a thermometric probe for providing the temperature measurement in a digital form. The circuits of the probe comprise an oscillator including a temperature responsive resistance element to be placed in contact with the area of the temperature to be measured, Tx. The output frequency fx of this oscillator is a function of Tx, and is measured by a counter controlled by a signal formed from a reference frequency fr provided by a reference oscillator and further provided to a frequency divider. A comparator compares the contents of the counter to that of a memory, and in case the counter contents is higher than the stored contents, the comparator controls the entry thereof to the memory so that the probe operates as a maximum thermometer.

Abstract: The memory (80) is intended to be read or modified by an electronic logical system of a pocket calculator. It comprises a plurality of bistable electromechanical flip-flop circuits (82). Each flip-flop circuit (82) comprises an input for setting at 1 (S) and an input for setting a zero (R) and an output (78). The inputs are connected individually to a multiplexor (702) controlled by a control circuit (701). The control circuit (701) is connected in two directions with a central processor via a bus (51). The control circuit (701) manages readings and writings to the memory (80).The memory is intended to memorize data which have to be retained in the calculator in a reliable and convenient way, even if the supply is cut off. The calculator is, for example, intended to make calculations concerning the application of the Ogino method, the data to be memorized being the durations of previous cycles and the date of the last period.