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公开(公告)号：US4906996A
公开(公告)日：1990-03-06
申请号：US278878
申请日：1988-12-02
申请人： Richard E. George
发明人： Richard E. George
CPC分类号： H03M1/0663 , H03M1/52
摘要： There is provided according to the invention a method and apparatus for eliminating or minimizing the error due to amplifier offset or drift error in an integrating dual slope analog-to-digital converter. The converter is provided with a switching and control arrangement whereby the integrating capacitor is charged for one-half of the predetermined charging time as a function of the sum of the levels of the unknown signal and the error signal. The integrating capacitor is charged for the remaining half of the predetermined time period as a function of the difference of the levels of the unknown signal and the error signal so that the capacitor reaches a level of charge which is a function of the level of the unknown signal substantially unaffected by the level of the error signal. During deintegration of the capacitor by a reference signal the polarity of the error signal is inverted during successive or consecutive deintegration cycles so that the error voltage is self-cancelling in two successive deintegrations and is eliminated from the summed digital output.
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公开(公告)号：US5073757A
公开(公告)日：1991-12-17
申请号：US248489
申请日：1988-09-23
申请人： Richard E. George
发明人： Richard E. George
IPC分类号： G01R27/26
CPC分类号： G01R27/2605
摘要： An apparatus for and a method of measuring capacitance employs a charge measuring system. While a capacitive element, which may be an unknown capacitor, is charged completely to a predetermined voltage, a charge proportional to the capacitance of the capacitive element is accumulated on the feedback capacitor of an integrating operational amplifier. Thereafter, the charge is measured by measuring the time required to completely remove the charge from the feedback capacitor using the same predetermined voltage as a reference. In a preferred embodiment, the present invention is manifested as a capacitance measurement feature in a hand-held multimeter wherein a largely conventional dual-slope analog-to-digital converter is employed as the charge measuring system.
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公开(公告)号：US4556867A
公开(公告)日：1985-12-03
申请号：US438374
申请日：1982-11-01
申请人： Richard E. George
发明人： Richard E. George
IPC分类号： H03M1/00
摘要： A dual slope analog to digital (A/D) converter starts by auto zeroing and making a number of high speed A/D samples before auto zeroing again. A microprocessor causes output of the high speed samples for a bar graph and applies predetermined correction factors to allow accumulation of the high speed samples to provide a high accuracy numerical output.
摘要翻译： 双斜率模数（A / D）转换器通过自动调零开始，并在自动归零之前产生多个高速A / D采样。 微处理器使得高速样品的输出用于条形图，并且应用预定的校正因子以允许高速样品的积累以提供高精度数值输出。
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公开(公告)号：US5119019A
公开(公告)日：1992-06-02
申请号：US442243
申请日：1989-11-28
申请人： Richard E. George
发明人： Richard E. George
CPC分类号： G01R15/08
摘要： Disclosed is a digital multimeter having an automatic function selection capability. The device includes a sensing circuit connected to its input to respond to the type of analog signal which is sensed and to provide logic signals which are characteristic thereof. These logic signals may be utilized to cause generation of encoding signals to encode and dispose the converter circuit to perform the desired conversion function and provide the desired display as a function of the analog input. The device may include an internal reference signal source such as a DC reference potential and the sensing circuit may sense a differential between such reference source and the external analog signal to make a determination to utilize or disconnect the reference signal source in performing the function dictated by the nature of the analog signal.
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公开(公告)号：USRE34428E
公开(公告)日：1993-11-02
申请号：US846442
申请日：1992-03-06
CPC分类号： H03M1/0663 , H03M1/52
摘要： There is provided according to the invention a method and apparatus for eliminating or minimizing the error due to amplifier offset or drift error in an integrating dual slope analog-to-digital converter. The converter is provided with a switching and control arrangement whereby the integrating capacitor is charged for one-half of the predetermined charging time as a function of the sum of the levels of the unknown signal and the error signal. The integrating capacitor is charged for the remaining half of the predetermined time period as a function of the difference of the levels of the unknown signal and the error signal so that the capacitor reaches a level of charge which is a function of the level of the unknown signal substantially unaffected by the level of the error signal. During deintegration of the capacitor by a reference signal the polarity of the error signal is inverted during successive or consecutive deintegration cycles so that the error voltage is self-cancelling in two successive deintegrations and is eliminated from the summed digital output.
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公开(公告)号：US5142221A
公开(公告)日：1992-08-25
申请号：US615169
申请日：1990-11-23
CPC分类号： G01R15/09 , G01R15/125
摘要： A digital multimeter having automatic function selection capability includes a signal type detector and an analog-to-digital converter formed as an application specific integrated circuit. The signal type detector has a comparator circuit that compares the analog input signal to be measured with predetermined thresholds and stores the resulting values, which are related to the type of analog input signal, in a memory that is also a part of the signal type detector. A controller executes an automatic function selection program that causes the controller to read the stored values and generate a corresponding function code, which causes an analog-to-digital converter to be configured to perform an appropriate conversion function on the analog input signal. When a change in the type of analog input signal is sensed, the controller aborts the present measurement cycle and proceeds with a next measurement cycle in which the changed analog input signal is measured. The controller also produces a change alert signal to indicate that a change in signal type has occurred.
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公开(公告)号：US5136251A
公开(公告)日：1992-08-04
申请号：US648277
申请日：1991-01-31
IPC分类号： G01R27/26
CPC分类号： G01R27/2605
摘要： The capacitance of an unknown capacitor is measured with multimeter instrumentation employing a dual slope analog-to-digital converter. The initial voltage across the capacitor is measured and the capacitor is cyclically charged until the capacitor reaches a predetermined proportion of possible charge. The final voltage is measured. The voltage across the charging resistance is integrated over successive charging cycles to provide a value proportional to the charge delivered to the capacitor and this value is divided by the difference between the initial and final voltages.
摘要翻译： 使用双斜率模数转换器的万用表仪器测量未知电容器的电容。 测量电容器两端的初始电压，电容器循环充电直到电容器达到预定比例的可能电荷。 测量最终电压。 充电电阻两端的电压在连续的充电周期内积分，以提供与传送到电容器的电荷成比例的值，该值除以初始和最终电压之间的差值。
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