A method and apparatus for telemetry, wherein first and second electrical signals are generated and applied across a remotely located electrical quantity, such as voltage or resistance, desired to be measured. The interaction of such first and second electrical signals with the electrical quantity to be measured produces first and second resultant electrical signals which are used by a computer or analog portion of the telemeter to determine the value of the electrical quantity in question.

A resistivity value measuring circuit comprises: a capacitor to accumulate charges; a switch to electrically connect a device to be measured such as a thermistor with the capacitor; a transistor to discharge the charges accumulated in the capacitor; and a measuring circuit to repetitively measuring the first time and the second time by performing the connecting operation by the switch. The first time corresponds to the period of time until the voltage of the capacitor which is accumulated by onl...

A circuit including an adjusting control (e.g. a potentiometer) which has two end connections and a slider which is adjustable for setting different resistance ratios. The two end connections of the potentiometer are each connected to one of two connections of a microprocessor and the slider is connected to one connection of a capacitor. The other capacitor connection is connected to a predetermined potential. To each of the two microprocessor connections at least one controllable switch is conn...

A methodology for decomposing a three-wire equivalent circuit into a cascade arrangement of a two-wire transmission line and a three-port terminating network is disclosed. Decomposition synthesis is accomplished by iteratively separating the equivalent circuit into the two component parts according to a predetermined algorithm and then comparing the derived three-port network to each network within a class requiring identification, thereby effecting an identification whenever a match occurs. Upo...

A system for determining the service type to which an energy meter having meter elements is connected. The system includes a memory for storing reference information relating to different service types. The system determines which meter elements of the energy meter are active, and then determines relative phase angles and phase voltages of the meter elements. The relative phase angles are determined in to be in an ABC or a CBA rotation. Power quality monitoring is used in determining the phase v...

Various embodiments of the present invention are directed to methods for determining the resistance state of nanowire-crossbar junctions, and can also be used to determine the resistance state of sub-microscale crossbar junctions. A pair of wires interconnected through the crossbar junction is biased to determine a first signal for the crossbar junction. The pair of wires interconnected through the crossbar junction is then biased again to increase the resistance of the crossbar junction. The pa...

Apparatus and method for determining characteristics of a bit stream of binary pulses. The apparatus has control apparatus for defining a window comparator and logic apparatus for accumulating and mapping numbers derived from a count of the number of times the bit stream pulses fall at points inside the window comparator and drawing an eye diagram defining characteristics of the bit stream.

A method for measuring the value of an electronic component, including applying a voltage or a current signal to the electronic component, where the signal has a first tone and a second tone of a different frequency, measuring a response signal from the electronic component, where the response signal also has a first tone and a second tone, applying signal processing on the measured response signal to generate a frequency domain signal, and calculating the value of the electronic component by us...

An electric current controller for field-device electronics controls and/or modulates the supply current. The supply current is driven by a supply voltage provided by an external energy supply. The field-device electronics has an internal operating and evaluating circuit for controlling the field device, as well as an internal supply circuit, the internal input voltage being derived from the supply voltage for feeding the internal operating and evaluating circuit. In the supply circuit is a volt...

A variable gain amplifier circuit 1 includes an amplifier A1, an amplifier A2, an inductor L1, and an inductor L2. The amplifier A1 has a predetermined gain and is connected at a terminal to a circuit output section. The amplifier A2 has a different gain from the amplifier A1 and is connected at a terminal to the circuit output section. The inductor L1 is connected at an end to a circuit input section and at the other end to the input terminal of the amplifier A1. The inductor L2 is connected at...