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公开(公告)号：US5227984A
公开(公告)日：1993-07-13
申请号：US666254
申请日：1991-03-08
IPC分类号： G01R31/02
CPC分类号： G01R31/026
摘要： An instrument having a continuity test feature wherein a change in continuity state from open-to-short or short-to-open is captured and displayed. A comparator provides continuity state information for a circuit under test. A storage device receives the state information and provides logic indicative of the continuity state which is read by a controller that executes a continuity capture program initiated by keypad or function selector input. A first transition between different continuity states is captured during a present capture cycle and is displayed in a form indicative of the type of transition captured. Subsequent transitions during the present capture cycle are ignored.
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公开(公告)号：US5432706A
公开(公告)日：1995-07-11
申请号：US811
申请日：1993-01-05
IPC分类号： G01D1/12 , G01R15/12 , G01R19/165 , G01R19/30
CPC分类号： G01D1/12
摘要： A min/max time stamp for a multimeter provides display of minimum and maximum measured values recorded since enabling a min/max function. The minimum and maximum values, as well as a present value, may be displayed, together with the relative or absolute time at which the measured minimum or maximum occurred. An alert signal is generated to indicate a new maximum or a new minimum measurement.
摘要翻译： 万用表的最小/最大时间戳显示了启用最小/最大功能后记录的最小和最大测量值。 可以显示最小值和最大值以及当前值，以及发生测量的最小值或最大值的相对或绝对时间。 生成警报信号以指示新的最大或新的最小测量。
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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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