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公开(公告)号：US4321530A
公开(公告)日：1982-03-23
申请号：US56729
申请日：1979-07-11
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。
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公开(公告)号：US4520310A
公开(公告)日：1985-05-28
申请号：US389723
申请日：1982-06-18
CPC分类号： G01R15/125 , G01R15/09
摘要： Circuitry for use in a voltage measurement and display device provides automatic function change for measurement of AC or DC voltages. Voltage measurement in a predetermined mode (DC, for example), is assumed. Upon detection of an input voltage component exceeding a predetermined threshold of the other mode, (AC, for example), the measurement function is changed to that other mode. Upon detection of a component in the other mode, in a range between the predetermined threshold and a second (preferably lower) threshold, an annunciator is activated to alert the user to the presence of the other mode (AC) voltage, for manual activation of a function-selecting switch if desired. Thus, in a specific embodiment, automatic function changeover is provided upon detection of AC components exceeding a predetermined threshold, along with activation of an AC annunciator. Alternatively, in the presence of low magnitude AC ripple voltage components on a DC voltage being measured, the annunciator is activated to attract the operator's attention, with measurement continuing in the DC function.
摘要翻译： 用于电压测量和显示设备的电路可以对AC或DC电压的测量提供自动功能更改。 假设在预定模式（例如DC）中的电压测量。 当检测到超过另一模式的预定阈值的输入电压分量（例如，AC）时，测量功能被改变为该另一模式。 在另一模式中检测到组件时，在预定阈值和第二（优选较低））阈值之间的范围内，激活报警器以警告用户存在其他模式（AC）电压，以便手动激活 如果需要的话功能选择开关。 因此，在具体实施例中，在检测到超过预定阈值的AC分量以及AC信号器的激活时，提供自动功能切换。 或者，在测量的直流电压上存在低幅度交流纹波电压分量的情况下，信号器被激活以引起操作者的注意，测量继续在直流功能中。
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公开(公告)号：US4150310A
公开(公告)日：1979-04-17
申请号：US871278
申请日：1978-01-23
申请人： Philip Emile, Jr.
发明人： Philip Emile, Jr.
CPC分类号： G11C27/026 , G01R15/12 , G01R19/04 , G01R29/02
摘要： A track and hold system for use with a test instrument such as a multimeter includes an input circuit, a buffer amplifier, a storage device such as a capacitor, an output amplifier, an output circuit, a detector for detecting a pulse on a signal passing from the input to the output, and a switch responsive to the detector for isolating the storage device from the input circuit but not the output circuit for a predetermined period. The system also includes a timer responsive to the detector to provide an isolation command to the switch for the predetermined period. Further, the system includes a delay circuit, responsive to the detector, for interposing a delay of variable duration prior to activating the timer. In a preferred embodiment, where the system is used in conjunction with a multimeter having a "hold" circuit which directs the meter to display the last-measured signal, an output is provided to the hold input of the meter directing the meter to "hold" for predetermined periods whenever the switch opens or closes. The "hold" output circuit is also used to provide indefinite retention of a reading and trigger lockout for the detector circuitry.
摘要翻译： 用于万用表等测试仪器的跟踪和保持系统包括输入电路，缓冲放大器，诸如电容器的存储装置，输出放大器，输出电路，检测信号通过脉冲的检测器 从输入到输出，以及响应于检测器的开关，用于将存储装置与输入电路隔离，而不是预定时间段的输出电路。 系统还包括响应于检测器的定时器，以在预定时间段内向开关提供隔离命令。 此外，系统包括响应于检测器的延迟电路，用于在激活定时器之前插入可变持续时间的延迟。 在优选实施例中，当系统与具有引导仪表显示最后测量信号的“保持”电路结合使用的万用表时，将输出提供给仪表的保持输入，指示仪表“保持 “每当开关打开或关闭时，预定时间。 “保持”输出电路还用于为检测器电路提供不确定的读取和触发锁定保持。
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4.发明授权Gated precision offset circuit for a digital meter having a dual slope analog-to-digital converter 失效具有双斜率模数转换器的数字仪表的门控精密偏移电路
公开(公告)号：US4303880A
公开(公告)日：1981-12-01
申请号：US79310
申请日：1979-09-26
申请人： Irwin Munt , Philip Emile, Jr. , John G. Walden
发明人： Irwin Munt , Philip Emile, Jr. , John G. Walden
IPC分类号： G01R19/255 , H03M1/00 , G01R17/06 , H03K1/02 , H03K13/02
CPC分类号： G01R19/255 , H03M1/06 , H03M1/52
摘要： An offset circuit for use in providing an offset signal to an analog-to-digital converter. The analog-to-digital converter has an integrator for performing signal integrate operations and is connected to a digital display. The offset circuit is gated to provide a variable offset current directly to the integrator of the analog-to-digital converter, thereby eliminating adverse loading effects on the high input impedance of the analog-to-digital converter.
摘要翻译： 用于向模数转换器提供偏移信号的偏移电路。 模数转换器具有用于执行信号积分操作并且连接到数字显示器的积分器。 偏移电路被选通以将模拟数字转换器的积分器直接提供可变的偏移电流，从而消除对模数转换器的高输入阻抗的不利负载影响。
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公开(公告)号：US4367467A
公开(公告)日：1983-01-04
申请号：US230408
申请日：1981-01-30
申请人： Philip Emile, Jr.
发明人： Philip Emile, Jr.
CPC分类号： G02F1/133308 , H05K7/12 , H05K7/14 , G02F1/133526 , G02F1/13452 , H05K1/141 , H05K3/325
摘要： In a device for mounting a liquid crystal display (LCD) to a circuit board, a holder is positioned between the LCD and the circuit board and a cover member positioned around the LCD and holder is secured to the board. The LCD is recessed slightly within the cover member and is exposed through the cover at a display opening. To compensate for the recess of the LCD within the cover member, an optically clear lens is positioned with its lower surface in contact with the LCD and upper surface extending outwardly through the display opening. An image of the alphanumeric characters displayed by the LCD is projected on the outer surface of the lens of create an optical illusion of the display characters at the surface of the cover.
摘要翻译： 在用于将液晶显示器（LCD）安装到电路板的装置中，保持器位于LCD和电路板之间，并且围绕LCD和保持器定位的盖构件固定到板上。 LCD稍微凹入盖构件内，并通过盖在显示开口处露出。 为了补偿盖构件内的LCD的凹部，光学透明透镜被定位成其下表面与LCD接触并且上表面向外延伸穿过显示开口。 由LCD显示的字母数字字符的图像投影在透镜的外表面上，从而在盖的表面产生显示字符的视觉错觉。
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6.发明授权
公开(公告)号：US4386308A
公开(公告)日：1983-05-31
申请号：US249411
申请日：1981-03-31
CPC分类号： H02J7/0091 , Y10S320/19 , Y10S320/21 , Y10T307/527 , Y10T307/625
摘要： A hysteresis type battery charger includes a circuit for monitoring battery voltage and in response controlling a pass transistor to supply charging current to a battery. When the battery voltage is below a first predetermined value, high charging rate current is supplied to the battery; when the battery voltage is above a second predetermined value, the battery is supplied with trickle charging current. First and second light emitting diodes (LEDs) are selectively energized to indicate whether the battery is receiving high charging rate current or trickle charging current. The second LED is connected in circuit with the pass transistor to provide charging current foldback during excessive current demand, e.g., short circuit. The battery charger includes a low battery monitor that is energized when the expected battery lifetime is at a predetermined value, e.g., one hour. Temperature compensating networks, are provided whereby battery charging and low battery monitor operating characteristics are substantially temperature independent.
摘要翻译： 滞环型电池充电器包括用于监测电池电压的电路，并且响应于控制通过晶体管以向电池提供充电电流。 当电池电压低于第一预定值时，向电池供应高充电速率电流; 当电池电压高于第二预定值时，电池被提供涓流充电电流。 选择性地激励第一和第二发光二极管（LED）以指示电池是否接收高充电速率电流或涓流充电电流。 第二LED与传输晶体管连接在一起，以在过电流需求（例如短路）期间提供充电电流折返。 电池充电器包括当预期电池寿命处于预定值（例如1小时）时通电的低电量监视器。 提供了温度补偿网络，由此电池充电和低电池监视器操作特性基本上与温度无关。
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公开(公告)号：US4125993A
公开(公告)日：1978-11-21
申请号：US702034
申请日：1976-07-02
申请人： Philip Emile, Jr.
发明人： Philip Emile, Jr.
CPC分类号： G04G99/006 , G04G3/025 , G04G9/082
摘要： Digital display devices and digital timepieces in which the display is remotely updated. The method permits continuous updating with simple and inexpensive TTL Logic and less frequent updating with microprocessor means. The remote updating signal can be transmitted through telephone means, broadcast means or other standard communications means to simultaneously update multiple digital displays.A single improved digital display device can be utilized as a master for controlling the display of multiple devices.
摘要翻译： 显示器远程更新的数字显示设备和数字时计。 该方法允许使用简单且便宜的TTL逻辑进行连续更新，并且使用微处理器手段更少地更新频率。 远程更新信号可以通过电话装置，广播装置或其他标准通信装置传输，以同时更新多个数字显示器。
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