公开(公告)号：US5367250A

公开(公告)日：1994-11-22

申请号：US994723

申请日：1992-12-22

申请人： Jeffery E. Whisenand

发明人： Jeffery E. Whisenand

IPC分类号： G01R19/165 ,  H01R11/18 ,  H01R11/22 ,  H01R13/66 ,  G01R31/02 ,  G01R19/16

CPC分类号： G01R19/16561 ,  H01R11/18 ,  H01R11/22 ,  H01R13/665

摘要： An instrument for performing electrical tests includes a housing adapted to be held in the hand. A conductive probe and a two-conductor power cable adapted to be connected to a vehicle battery protrude from the housing. Red and green light emitting diodes (LED's) mounted in the housing are operatively interconnected with the probe and power cable through circuitry which causes the red LED to glow when the probe contacts a positive voltage, and the green LED to glow when the probe contacts a low voltage, ground, or a negative voltage. Continuity testing may be performed by contacting the probe against one terminal of a device to be tested, and contacting the other terminal of the device to ground or to an auxiliary test lead extending from the housing, causing the green LED to glow. The instrument includes a momentary contact switch that permits the probe to be energized by internal connection to the positive or ground input terminal. Actuating the switch momentarily to energize the probe with a positive voltage causes the green LED to cease glowing and the red LED to glow if the test probe is in contact with a low resistance device, rather than directly to ground, thus providing means to determine whether ground or the supply terminal of a high-current load device has been probed.

摘要翻译： 用于执行电测试的仪器包括适于保持在手中的壳体。 适于连接到车辆电池的导电探针和双芯电力电缆从壳体突出。 安装在外壳中的红色和绿色发光二极管（LED）通过电路与探头和电源电缆可操作地互连，电路会在探针接触到正电压时使红色LED发光，当探针接触到绿色LED时，绿色LED发光 低电压，接地或负电压。 可以通过将探针接触待测试设备的一个端子，并将设备的另一个端子接地或从壳体延伸的辅助测试导线接触探针，使绿色LED发光，从而进行连续性测试。 仪器包括一个瞬时接触开关，允许通过内部连接到正极或接地输入端子来激发探头。 瞬间致动开关，以正电压激励探头，如果测试探针与低电阻器件接触而不是直接接地，绿色LED将停止发光，红色LED发光，从而提供了确定是否 已经探测到大电流负载装置的接地或供电端子。

公开(公告)号：US4706289A

公开(公告)日：1987-11-10

申请号：US770266

申请日：1985-08-28

申请人： Jorgen S. Jensen

发明人： Jorgen S. Jensen

IPC分类号： G01R19/30 ,  G01R19/16

CPC分类号： G01R19/30

摘要： A method and apparatus for continuously measuring and indicating the variations of the intensity of an electric signal, such as a signal to be recorded on a tape recorder, which provides measuring to take place at successive measuring periods in such a manner that a measured result is yielded representing the maximum value of the signal intensity. The signal intensity is measured during consecutive measuring periods and registered. The indicator has the ability to maintain the read-out of a maximum value, read during a measuring period, during a following hold period, whereby the measuring periods provided have a duration being an order of size less than the time of reaction of the human eye. The system stores the maximum intensity values being detected during each of a series of consecutive measuring periods, and provides hold periods having substantially longer durations by being an order of size longer than the time of reaction of the human eye. The indicating means is connected so as to provide indication of the largest of the intensity values being registered within the series of consecutive measuring periods during the hold period. Hereby, a display of the varying intensity of a signal as an observable display of peak values of the intensity is achieved.

摘要翻译： 一种用于连续测量和指示电信号的强度变化的方法和装置，例如要记录在磁带录音机上的信号，其提供在连续的测量周期进行的测量，使得测量结果为 产生代表信号强度的最大值。 在连续的测量期间测量信号强度并注册。 该指示器能够在随后的保持期间保持读取最大值，在测量期间读取，由此所提供的测量周期的持续时间小于人类的反应时间的大小 眼。 系统存储在一系列连续测量周期中的每一个期间被检测到的最大强度值，并且通过比人眼反应的时间长的顺序提供具有基本上更长持续时间的保持期。 指示装置被连接以便在保持期间内提供在一系列连续测量周期内登记的最大强度值的指示。 因此，实现了作为强度的峰值的可观察显示的信号的变化强度的显示。

公开(公告)号：US4388590A

公开(公告)日：1983-06-14

申请号：US165762

申请日：1980-07-03

申请人： John W. Richards ,  Ian Craven

发明人： John W. Richards ,  Ian Craven

IPC分类号： G01R13/40 ,  G01R19/04 ,  G01R19/16

CPC分类号： G01R19/04 ,  G01R13/405

摘要： An arrangement which displays an indication of the amplitude level of digital audio signals. The arrangement includes an acquisition means which receives digital audio signals and determines the peak amplitude value of the signals received between successive interrogations by a control means, and at least this value is indicated by a display means. If the currently indicated value exceeds the last determined value, then the indicated value is caused to decay at a predetermined rate.

摘要翻译： 显示数字音频信号的振幅电平的指示的装置。 该装置包括：接收数字音频信号并通过控制装置确定在连续询问之间接收的信号的峰值振幅值的获取装置，并且至少该值由显示装置指示。 如果当前指示的值超过最后确定的值，则指示的值被以预定的速率衰减。

公开(公告)号：US4365193A

公开(公告)日：1982-12-21

申请号：US174695

申请日：1980-08-01

申请人： Adriano Bollero ,  Bruno Carpinello ,  Giuseppe Galliano ,  Roberto Pomponi

发明人： Adriano Bollero ,  Bruno Carpinello ,  Giuseppe Galliano ,  Roberto Pomponi

IPC分类号： G01R19/17 ,  G01R29/027 ,  G01R29/033 ,  G01R29/00 ,  G01R19/16

CPC分类号： G01R29/0273 ,  G01R19/17 ,  G01R29/0276 ,  G01R29/033

摘要： A system for measuring and storing the amplitudes plus duration and/or rise times of overvoltage pulses occurring on a transmission line comprises a voltage divider working into a first and a second comparator respectively detecting an abnormal voltage exceeding a predetermined sensitivity threshold and discriminating among different amplitude levels above that threshold. The first comparator triggers an oscillator driving a pulse counter which measures the duration of an overvoltage pulse and also provides quantized information on rise time to the highest amplitude threshold surpassed by that pulse as determined by the second comparator. This information is stored in a memory with two groups of cells respectively assigned to combinations of amplitude with duration and combinations of amplitude with rise time, the occurrence of any such combination incrementing the contents of the respective cell. These cells are cyclically scannable and their contents can be selectively displayed on a visualizer such as an oscilloscope.

摘要翻译： 用于测量和存储幅度加上在传输线上发生的过电压脉冲的持续时间和/或上升时间的系统包括分压器，分压器分别工作在第一和第二比较器中，分别检测超过预定灵敏度阈值的异常电压，并在不同幅度 高于该阈值。 第一比较器触发振荡器驱动脉冲计数器，该脉冲计数器测量过电压脉冲的持续时间，并且还将上升时间的量化信息提供给由第二比较器确定的该脉冲超过的最大幅度阈值。 该信息被存储在具有两组信元的存储器中，这两组信元分别被分配给具有持续时间的幅度和振幅的组合与上升时间的组合，任何这样的组合的出现增加了相应单元的内容。 这些单元是循环可扫描的，并且它们的内容可以有选择地显示在诸如示波器的可视化器上。

公开(公告)号：US4321530A

公开(公告)日：1982-03-23

申请号：US56729

申请日：1979-07-11

申请人： Austin T. Kelly ,  Philip Emile, Jr. ,  Alan H. Stolpen

发明人： Austin T. Kelly ,  Philip Emile, Jr. ,  Alan H. Stolpen

IPC分类号： G01R15/12 ,  G01R19/145 ,  G01R15/08 ,  G01R19/16

CPC分类号： G01R19/145 ,  G01R15/125

摘要： A digital multimeter having a tone generating circuitry and operable in a tone mode of operation for providing an audible indication when a measured electrical characteristic has a predetermined relationship with a reference value. The audible indication may be provided when a voltage level exceeds a preselectable limit, such as 1 or 2 volts. Predetermined limits for resistance values may also be selected for actuation of the audible tone. The device may be utilized as a conventional multimeter when the tone mode is non-operative.

摘要翻译： 一种数字万用表，其具有乐音产生电路，并且可以在音调操作模式下操作，以便在测量的电特性与参考值具有预定关系时提供可听见的指示。 当电压电平超过预置极限（例如1或2伏特）时，可以提供可听见的指示。 还可以选择电阻值的预定极限以用于致动可听音。 当音调模式不工作时，该装置可以用作常规的万用表。

公开(公告)号：US4171512A

公开(公告)日：1979-10-16

申请号：US849392

申请日：1977-11-07

申请人： Shin Tsuda

发明人： Shin Tsuda

IPC分类号： G01R1/36 ,  G01R19/14 ,  H02H11/00 ,  G01R19/16 ,  H02H9/00

CPC分类号： G01R1/36 ,  G01R19/14 ,  H02H11/002

摘要： In a circuit for preventing breakdown of a load resulting from a wrong connection of a power source, there are provided a first load to which a DC voltage source should be applied at a predetermined polarity and to which a wrong polarity connection of the DC voltage source should be prevented, a second load to which the DC voltage should be applied, and a transistor having the base thereof connected to the second load and the collector thereof connected to one terminal for connection with the DC voltage source. The first load is connected between the base electrode and emitter electrode of the transistor. The junction of the first and second loads is connected to another terminal for connection to the DC voltage source.

摘要翻译： 在用于防止因电源错误连接而引起的负载故障的电路中，提供了一个第一负载，其中以预定极性施加直流电压源，并且直流电压源极性连接错误 应该防止施加直流电压的第二负载，以及将其基极连接到第二负载的晶体管，其集电器连接到一个端子，用于与直流电压源连接。 第一负载连接在晶体管的基极和发射极之间。 第一和第二负载的接点连接到另一个端子，用于连接到直流电压源。

公开(公告)号：US4166245A

公开(公告)日：1979-08-28

申请号：US851135

申请日：1977-11-14

申请人： John H. Roberts

发明人： John H. Roberts

IPC分类号： G01R13/28 ,  G01R13/40 ,  G01R19/16 ,  G01R19/00

CPC分类号： G01R13/28 ,  G01R13/40

摘要： Related multiple characteristics of a single complex waveform are displayed as a variable length line of light with a floating spot which moves relative to the line. Logic circuitry, in response to an electrical input signal, causes energization of a plurality of the light emitters in response to the first input signal characteristic and the energization or extinguishing of a single light emitter in response to a second characteristic of the input signal.

公开(公告)号：US4160206A

公开(公告)日：1979-07-03

申请号：US860598

申请日：1977-12-14

申请人： Victor Bojarski

发明人： Victor Bojarski

IPC分类号： G01R15/12 ,  G01R19/155 ,  G01R27/14 ,  G01R19/16 ,  G01R27/00 ,  G01R31/02

CPC分类号： G01R19/155 ,  G01R15/12 ,  G01R27/14 ,  G01R1/06788

摘要： An audible voltage-impedance tester for generating distinct sounds when its test probes are connected across an unknown source, be it a resistive source, a DC voltage source, an AC voltage source or combination thereof. No switching is required between resistive testing and voltage testing nor between DC voltage testing and AC voltage testing. The tester is able to generate distinct sounds for different resistance values, for different DC voltage amplitudes, for different AC voltages with the same frequency but different amplitudes, and for AC voltages with different frequencies but the same amplitudes.A visual indicator of the audible sound is disclosed along with circuitry that utilizes a multi-vibrator whose powered operation by a battery is not affected by the unknown source.

摘要翻译： 一种用于在其测试探针（12）和（14）跨越未知源连接时产生不同声音的可听见的电压 - 阻抗测试器（10），不管是电阻源，直流电压源，交流电压源还是其组合。 在电阻测试和电压测试之间，也不需要在直流电压测试和交流电压测试之间进行切换。 对于具有相同频率但幅度不同的不同交流电压，对于不同的直流电压幅度，测试仪（10）可以产生不同的电阻值，并且对于具有不同频率但具有相同幅度的交流电压，可产生不同的声音。 公开了可听见的声音的视觉指示器（20）以及电路（18），电路（18）利用其中由电池（21）供电操作不受未知来源影响的多重振动器（18）。

公开(公告)号：US4110684A

公开(公告)日：1978-08-29

申请号：US779435

申请日：1977-03-21

申请人： Philip F. Gale

发明人： Philip F. Gale

IPC分类号： G01R31/08 ,  G01R19/16

CPC分类号： G01R31/083

摘要： For detecting faults on low voltage alternating current electric power distribution cables, recorders are provided, each triggered by a selected occurrence, e.g. a decrease in signal amplitude or a change in the waveform, to cease recording, after a short delay, of the waveform data in digital form, so that a store holds digital data enabling the waveform of the last few cycles covering the period before and after the selected occurrence. Using a voltage gradient technique analysis of the data enables the position of the fault to be located.

摘要翻译： 为了检测低压交流电力配电电缆上的故障，提供了一个记录器，每一个触发选择的事件。 信号幅度的减小或波形的变化，以在数字形式的波形数据的短暂延迟之后停止记录，使得存储器保持数字数据，使能覆盖前后周期的最后几个周期的波形 选定的事件。 使用数据的电压梯度技术分析可以确定故障的位置。

公开(公告)号：US4101826A

公开(公告)日：1978-07-18

申请号：US805694

申请日：1977-06-13

申请人： Hendrik Horsitmann

发明人： Hendrik Horsitmann

IPC分类号： G01R19/165 ,  G01R31/02 ,  G01R19/16

CPC分类号： G01R19/16509

摘要： A fault indicator includes a reed relay disposed for responding to a magnetic field surrounding a conductor particularly when conducting above-normal current. The relay triggers a latch which enables a counter and starts a pulse generator which, in turn, drives a flasher, and the pulses are counted for resetting the device by resetting the latch after a number of pulses have been counted. The reed relay is disposed in a position for adjustment of alignment and misalignment in relation to the conductor.