Abstract: An air conditioner charging station withdraws refrigerant from an air conditioner, reclaims it by removing certain materials, and returns the reclaimed refrigerant to the same air conditioner from which it was withdrawn, and also provides new, make-up refrigerant to the air conditioner, in the amount necessary to make a full charge. A microprocessor provides a diagnostic capability, and includes tables of acceptable values of parameters, such as air discharge temperature, suction pressure, etc., for different automobile makes and air conditioner types; provision is made for adjusting the acceptable ranges of such values due to one or more ambient factors, of which ambient relative humidity may be one. The microprocessor, after comparing actual values to acceptable value ranges of the air conditioner operating values, displays possible causes of air conditioner malfunction on a video screen.

Abstract: A microprocessor provides a diagnostic capability, and includes tables of acceptable values of parameters, such as air discharge temperature, suction pressure, etc., for different automobile makes and air conditioner types; provision is made for adjusting the acceptable ranges of such values due to one or more ambient factors, of which ambient relative humidity may be one. The microprocessor, after determining whether the air conditioning system has a cycling or a non-cyling clutch and providing a valid set of actual system values based on whether the clutch is cycling or non-cycling, compares actual values to acceptable value ranges of the air conditioner operating values, and displays possible causes of air conditioner malfunction on a video screen. Self-testing of both the microprocessor and associated electrical elements, and of mechanical elements such as conduits, valves and a scale is performed.

Abstract: An air conditioner charging station withdraws refrigerant from an air conditioner, reclaims it by removing certain materials, and returns the reclaimed refrigerant to the same air conditioner from which it was withdrawn, and also provides preselected commands upon receipt of signals indicating conditions of temperature, pressure, etc. The reclaimed refrigerant is deposited into a reservoir, which contains a float that cooperates with a level sensor and signal generator to send a signal when the liquid level has reached a predetermined position. This signal causes a valve in the discharge line from the reservoir to close, to prevent discharge of gas from the reservoir.

Abstract: Each of a plurality of data modules employing commercially available microprocessor circuitry, process pulse rate information from a plurality of remote monitors to develop a digital indication of a desired parameter, i.e., radiation level. A digital check module, incorporating microprocessor electronics comparable to that of the data module, scans the respective data modules to determine the operational integrity of the data modules and automatically assumes the operational responsibility of a data module determined to be operating improperly.While the radiation level is proportional to the rate of the pulses developed by the radiation monitor the instantaneous pulse rate is random. The data modules and check module are digitally designed, incorporating commercially available micro-computers, to determine the true average rate of random pulses or events and to automatically optimize the trade-off between statistical error and system response time.

Abstract: A micro-computer circuit including a read-only memory averages pulse information at a plurality of averaging levels with each averaging level corresponding to a progressively increasing maximum count level and generates a best estimate of the true mean rate of the pulse information wherein the best estimate corresponds to the average of the averaging level of the highest full count. If the pulse information remains stationary the averaging process continues to provide desired system resolution. If however the pulse information is determined to be non-stationary a new best estimate is developed to provide desired system accuracy. An optimum trade-off between system accuracy and resolution is thus achieved.

Abstract: A series arrangement of a plurality of divide by N circuits, where N is a predetermined number of events, develops an output signal in response to the occurrence of each integer power of N events. A logic circuit increments a counter in response to each output signal and the contents of the counter provide an indication of the integer power of N events.