Abstract: A method of testing a design of a satellite payload transponder with modules of radio frequency (RF) communications circuitry includes executing a modeling application for establishing a modeling environment for generating a virtual satellite payload transponder and virtual test equipment. The virtual satellite payload transponder has virtual modules of RF communications circuitry, with functionality equivalent to that of the satellite payload transponder with modules of RF communications circuitry. The virtual test equipment has functionality equivalent to that of physical test equipment in conjunction with modular test system software. The modeling environment establishes an executable block diagram for performing a simulation of executed satellite payload transponder command, RF signal performance and telemetry response testing, utilizing a given version of the modular test system software corresponding to the modules of RF communications circuitry of the design of the satellite payload transponder.

Abstract: A method of testing a design of a satellite payload transponder with modules of radio frequency (RF) communications circuitry includes executing a modeling application for establishing a modeling environment for generating a virtual satellite payload transponder and virtual test equipment. The virtual satellite payload transponder has virtual modules of RF communications circuitry, with functionality equivalent to that of the satellite payload transponder with modules of RF communications circuitry. The virtual test equipment has functionality equivalent to that of physical test equipment in conjunction with modular test system software. The modeling environment establishes an executable block diagram for performing a simulation of executed satellite payload transponder command, RF signal performance and telemetry response testing, utilizing a given version of the modular test system software corresponding to the modules of RF communications circuitry of the design of the satellite payload transponder.

Abstract: A method of testing designs of wiring harnesses includes generating a virtual electrical system including virtual wiring harnesses that interconnect virtual modules of communications circuitry including signal sources and signal destinations. The method also includes testing signal pathways and thereby the virtual wiring harnesses. The testing includes generating a simulated signal that is input to a specific electrical connection at a signal source and routed through a signal pathway to a specific electrical connection to a signal destination. The testing includes verifying receipt of the simulated signal by the specific electrical connections via the signal pathway. And in an instance in which receipt is not verified, the testing includes identifying a particular electrical connection at which an error occurred in the receipt of the simulated signal, and a particular virtual wiring harness and a particular virtual module respectively connected to and including the particular electrical connection.

Abstract: An apparatus for monitoring bioelectric signals of a patient which includes a processing system and an interface for receiving external electrical signals representative of a condition of the patient. The interface is configured to convey a representation of the received external signals to the processing system, and includes a common mode cancellation amplifier circuit which is adapted to reduce common mode signal noise present in the external signals.

Abstract: A portable hand-held electrical testing device including a processor housed within an enclosure. The processor is configured to operate on commands by a user to process sub-microvolt electrical signals received through an input/output interface. The input/output interface includes a capacitive coupled amplifier with adjustable gain settings. Onboard memory linked to the processor stores processing data and instructions. A display device is mounted to said enclosure and is operatively connected to the processor to display processing results in real time.

Abstract: A portable hand-held electrical testing device including a processor housed within an enclosure. The processor is configured to operate on commands by a user to process sub-microvolt electrical signals received through an input/output interface. The input/output interface includes a capacitive coupled amplifier with adjustable gain settings. Onboard memory linked to the processor stores processing data and instructions. A display device is mounted to said enclosure and is operatively connected to the processor to display processing results in real time.

Abstract: A fluid delivery system is disclosed which includes a pump and a fluid delivery set. The fluid delivery set includes a stop cock valve, and the pump includes a valve actuation unit into which the stop cock valve is positioned for operation of the system. The valve actuation unit includes a valve receiving mechanism which requires the valve to be closed in order to be inserted into or removed from the valve actuation unit, thereby preventing accidental free flow of fluid at all times. The fluid delivery set may also include an auxiliary fluid source to allow periodic flushing of the fluid delivery line, and the valve actuation unit can be programmed by the pump to automatically initiate periodic flushing cycles if desired.

Abstract: A fluid delivery system is disclosed which includes a pump and a fluid delivery set. The fluid delivery set includes a stop cock valve, and the pump includes a valve actuation unit into which the stop cock valve is positioned for operation of the system. The valve actuation unit includes a valve receiving mechanism which requires the valve to be closed in order to be inserted into or removed from the valve actuation unit, thereby preventing accidental free flow of fluid at all times. The fluid delivery set may also include an auxiliary fluid source to allow periodic flushing of the fluid delivery line, and the valve actuation unit can be programmed by the pump to automatically initiate periodic flushing cycles if desired.

Abstract: A drop detector circuit and method are provided for a drop detector of the type including a drop chamber and a light emitter and corresponding detector located on opposite sides of the drop chamber. The detector is saturated by light emitted from the light emitter to produce a saturated detector output signal. The detector circuit senses variations in the detector output signal caused by drops passing through the drop chamber between the emitter and detector that block light emitted by the emitter from reaching the detector. The detector circuit senses the slope of the variations in the detector output signal and produces a control signal when the slope exceeds a threshold value.

Abstract: A drop detector circuit and method are provided for a drop detector of the type including a drop chamber and an electro-optical sensor. A detector detects drops passing through the drop detector in an optical sensing path between the detector and at least one light source. In response to the detection of a drop passing through the optical path, the detector produces an output signal. A capacitor is connected between the detector and an amplifier to block the DC component of the output signal. After amplification, the signal is passed through a low pass filter to further block signals caused by undesirable factors. The cutoff frequency of the low pass filter is controlled by a microprocessor that controls the pump that pumps liquid from the drop chamber. The detector and light source or sources are arranged to detect drops falling in the drop chamber at virtually any angle and in virtually any ambient light condition.

Abstract: A drop detector circuit and method are provided for a drop detector of the type including a drop chamber and an electro-optical sensor. A photodiode detects drops passing through its optical sensing path, and a capacitor is connected between the photodiode and an amplifier to block the DC component of the diode signal. After amplification, the signal is passed through a low pass filter to further block signals caused by undesirable factors. The cutoff frequency of the low pass filter is controlled by a microprocessor that controls the pump that pumps liquid from the drop chamber.

Abstract: A device having a rechargeable power source with an associated battery charger base having a quick charge current output and a trickle charge current output. A control circuit within the device is also provided that monitors if and for how long the device is attached to the base and determines the present capacity of the power source. Based on these signals, the control circuit selects an appropriate charge current output. The control circuit also includes timer circuits and circuits to measure the battery voltage during charging to allow for maximum but safe quick charging to protect the power source from long-term damage.