摘要:
A position detector includes a magnetic recording medium on which a prescribed magnetic pattern has been formed, a magnetoresistive element the amplitude value of which varies in response to the magnetic pattern, an amplifier for amplifying the output of the magnetoresistive element, the offset voltage of the amplifier output being variable, and an output observing element for observing the output of the amplifier. The offset voltage of the amplifier is set based upon the results of observation provided by the output observing element. Adjustment of the offset voltage is thus set automatically.
摘要:
A method and apparatus for determining the parameters (i.e., proportion, mean, and standard deviation) of constituent subpopulations within a sample population of particles which contains overlapping populations. The invention includes the use of the EM algorithm, an iterative process which estimates the probability that a particle belongs to any given overlapping subpopulation.
摘要:
Apparatus for monitoring an externally applied parameter to selected products. The invention involves a housing enclosing a sensor, and a monitoring and output network. The sensor has a characteristic that varies in some predetermined manner with variation in the monitored parameter. The monitoring and output network involves a sensor which produces a signal representative of the monitored characteristic. Values associated with the signal are stored in a memory device for subsequent, selected retrieval.
摘要:
A monitoring system for an electric motor including a temperature sensor (5) for monitoring the operating temperature of a motor, a memory (4) in which is stored the absolute maximum operating temperature and a predetermined maximum permitted operating temperature of the motor, and an indicator (6) for indicating the sensed temperature as lying: a) within a safe operating range, below the predetermined maximum permitted operating temperature; b) within a hazardous operating range, between the predetermined maximum permitted operating temperature and the absolute maximum operating temperature; and c) at or above a dangerous operating range, lying at or above the absolute maximum operating temperature. The monitoring system further includes a recorder (93) for recording the number of times the motor is operating beyond the predetermined maximum permitted operating temperature and the number of times the motor is operated beyond the absolute maximum operating temperature.
摘要:
An AC waveform monitoring system includes detecting circuitry for providing a sensed analog signal. Oscillator circuitry is coupled to the detecting circuitry for providing a zero crossing signal. The oscillator circuitry is synchronized with a frequency of the sensed analog signal. Signal processing circuitry is coupled to both the detecting circuitry and the oscillator circuitry for identifying a peak voltage signal and an integral volt-seconds signal of the sensed analog signal responsive to the zero crossing signal. Digital processing circuitry is coupled to the signal processing circuitry and the oscillator circuitry. The digital processing circuitry includes memory for storing a plurality of predetermined signal voltage boundary values and a program utilizing the identified peak voltage signal, the integral volt-seconds signal and the stored predetermined signal values to identify an abnormal voltage event.
摘要:
System operating regimes are identified by dividing a range of each one of a plurality of sensed system parameters into a plurality of predetermined range segments, assigning an alphanumeric character to each range segment of each parameter, and generating a composite number, each digit of which is made up of one of the alphanumeric range segment characters of each parameter. Apparatus compares the current sensed values of each parameter to the corresponding predetermined range segments to determine the current range segment of each sensed parameter, generates a current composite number made up of the current range segments of all of the parameters, and compares the current composite number to a plurality of predetermined system operating regimes to determine if the current composite number identifies one of a plurality of system operating regimes. The current composite number is converted to a base ten equivalent to facilitate the comparison of the current composite number to the plurality of system operating regimes.
摘要:
A low-cost data logging device, particularly suitable for recording gas meter performance having an electrical transducer to produce an electrical analogue of a parameter to be recorded, a calculator circuit to perform an analysis of measurements of the parameter and a plurality of memories to store the results of the analyses.
摘要:
An arrangement for controlling the scan of a spectrometer employs a computer and associated equipment for initiating one complete scan of the spectrometer. During this scan where partial ranges of signal values are detected, said ranges being of particular interest, repeated scans of these ranges occurs until a sufficient number to provide useful information is obtained and, thereupon, the continuous scan of the spectrometer is continued. The equipment employed includes address registers and comparison circuitry for indicating and storing the addresses of those signal values which the computer has selected after a determination has been made that a partial range exists. Where signal values far exceed the threshold value which defines a partial range, no repeated scanning is employed or is necessary.