公开(公告)号：US4789824A

公开(公告)日：1988-12-06

申请号：US065020

申请日：1987-06-19

申请人： Dieter Henkelmann

发明人： Dieter Henkelmann

IPC分类号： G01D1/00 ,  G01D7/00 ,  G01R13/02 ,  G01R1/00 ,  G01R15/08 ,  G01R19/26

CPC分类号： G01R13/02 ,  G01D1/00 ,  G01D7/002

摘要： In order to display a measured value, a digital measuring instrument is provided with a digital display and an analog display. The display value emitted by the digital display is fixed during a predetermined holding time. The analog display displays the difference between the current measured value and the particular display value of the digital display at the time. The current measured value may be read off at the beginning of a new holding time on the digital display, or it can be ascertained as the sum of the values of the digital and analog displays.

摘要翻译： 为了显示测量值，数字测量仪器具有数字显示器和模拟显示器。 数字显示器发出的显示值在预定的保持时间内固定。 模拟显示屏显示当前测量值与当时数字显示器的特定显示值之间的差异。 可以在数字显示器上的新保持时间开始时读取当前测量值，或者可以将其确定为数字和模拟显示器的值的总和。

公开(公告)号：US4161691A

公开(公告)日：1979-07-17

申请号：US883543

申请日：1978-03-06

申请人： Stanley L. Vermeers

发明人： Stanley L. Vermeers

IPC分类号： G01R15/12 ,  G01R19/252 ,  G01R27/02 ,  G01R19/26 ,  G04F8/00

CPC分类号： G01R15/125 ,  G01R19/252 ,  G01R27/02

摘要： Apparatus for selectively measuring voltage, resistance, and time durationf an event, each of which is associated with an electrical network, includes a device for providing a first train of digital pulses, the frequency of the pulse train being related to an analog voltage coupled thereto. The measuring apparatus also includes a clock for generating a second train of digital pulses of fixed frequency, and a constant current source to be coupled to a resistive element being measured by the apparatus. The apparatus further includes counters selectively receiving one of the digital pulse trains for counting the number of pulses received during a selected time period, and for providing a digital output in which the value of a quantity measured by the apparatus is encoded. A display coupled to the counter provides a visible numerical display of a measured value at the conclusion of the selected time period, and control means couples a plurality of binary control signals to the counters to determine the duration of each time period.

摘要翻译： 用于选择性地测量与电网相关联的事件的电压，电阻和持续时间的装置包括用于提供第一列数字脉冲的装置，所述脉冲串的频率与模拟电压耦合 到此。 测量装置还包括用于产生固定频率的第二数字脉冲序列的时钟和要耦合到由该装置测量的电阻元件的恒流源。 所述装置还包括选择性地接收数字脉冲串中的一个的计数器，用于对在选定的时间周期期间接收的脉冲数进行计数，并且提供数字输出，其中由装置测量的量的值被编码。 耦合到计数器的显示器在所选择的时间段结束时提供测量值的可视数字显示，并且控制装置将多个二进制控制信号耦合到计数器以确定每个时间段的持续时间。

公开(公告)号：US4143318A

公开(公告)日：1979-03-06

申请号：US794218

申请日：1977-05-05

申请人： Philip C. Harvey

发明人： Philip C. Harvey

IPC分类号： G01L21/32 ,  G01R19/252 ,  G01R19/26 ,  H03K13/20

CPC分类号： G01L21/32 ,  G01R19/252

摘要： In the ion gauge system disclosed herein, the ion current obtained from an ion gauge tube is directly converted to a signal having a frequency proportional to the ion current so that a digital measurement of vacuum may be obtained. The ion current charges an integrating capacitor which is periodically discharged after reaching a preselected threshold. Preferably, the threshold is adjusted in proportion to the ion gauge emission current so that automatic compensation for variation in the emission current is obtained, the output frequency being proportional to the ratio of the ion current to the emission current. The variable frequency output signal generated by the integration and discharge process is counted by a scaling circuit which automatically changes the timing interval to provide the desired number of significant figures while incrementing the exponent value in a scientific notation display in keeping with the active time base.

公开(公告)号：US3792352A

公开(公告)日：1974-02-12

申请号：US3792352D

申请日：1970-09-10

申请人： SOLARTRON ELECTRONIC GROUP

发明人： METCALF E ,  DOREY H

IPC分类号： H03M1/00 ,  G01R17/06 ,  G01R1/00 ,  G01R19/26

CPC分类号： H03M1/00 ,  H03M1/50

摘要： An analog-to-digital converter provides improved resolution without attendant loss of accuracy or speed of operation over known converters. This is achieved by providing slow-acting feedback to the integrating circuit for increasing resolution. The fast-acting feedback consists of quanta of charge of defined magnitude and the slow-acting feedback is derived from the fast feedback either by smoothing or by reducing the frequency of the quanta.

摘要翻译： 模数转换器提供改进的分辨率，而不会伴随着对已知转换器的精确度或操作速度的损失。 这是通过向积分电路提供慢效反馈来提高分辨率来实现的。 快速反馈由定义幅度的电荷量子化构成，慢动作反馈通过平滑或通过降低量子的频率从快速反馈导出。

公开(公告)号：US3654483A

公开(公告)日：1972-04-04

申请号：US3654483D

申请日：1970-02-06

申请人： WESTINGHOUSE ELECTRIC CORP

发明人： LENEHAN BERNARD E

IPC分类号： G01R15/14 ,  H02H1/00 ,  G01R19/26 ,  G01R15/06

CPC分类号： H02H1/0061 ,  G01R15/14

摘要： An apparatus for transferring intelligence such as current magnitude from a high potential conductor to ground potential through the capacitive effect of a coupler to eliminate the necessity of providing sufficient insulation in the current transducer to withstand the high potential difference between that of the conductor and that of ground.

摘要翻译： 一种用于通过耦合器的电容效应将诸如电流大小的电流从高电位导体传递到接地电位的装置，以消除在电流传感器中提供充分绝缘的必要性，以承受导体与电导体之间的高电位差 地面。

公开(公告)号：US3622881A

公开(公告)日：1971-11-23

申请号：US3622881D

申请日：1969-03-21

申请人： FORD MOTOR CO

发明人： SILVER ARNOLD H ,  ZIMMERMAN JAMES E

IPC分类号： G01R19/00 ,  G01R19/252 ,  H03B15/00 ,  G01R19/26 ,  H03C1/00

CPC分类号： G01R19/0084 ,  G01R19/252 ,  H03B15/00 ,  Y10S505/843

摘要： This disclosure relates to a superconducting circuit means that may be utilized as an ultra-high sensitivity voltmeter or a generator generating a voltage having a substantially constant amplitude. It comprises a superconductive material having a weak link positioned therein with means for applying a voltage of unknown magnitude across the weak link. An oscillator has its output coupled to the weak link so that the output signal of the oscillator generates an oscillating current through it. The voltage of unknown magnitude causes an oscillating current to be generated through the weak link with a frequency proportional to the unknown magnitude of the voltage. The weak link mixes the frequency of the two currents and a demodulating means detects the frequency of the oscillating current produced by the voltage of unknown magnitude. When the circuit means is to be employed as a voltmeter, a frequency meter may be connected to the demodulating means which has a scale readable in voltage units. If the circuit means is to be employed as a generator of a voltage having a substantially constant amplitude, a standard frequency may be fed to a comparator that also receives the output from the demodulating means. The output from the comparator may be fed back through suitable means to the weak link and the amplitude of the voltage having a substantially constant magnitude may be read out across a circuit component connected to the superconducting material.

公开(公告)号：US3581203A

公开(公告)日：1971-05-25

申请号：US3581203D

申请日：1969-01-02

申请人： WILLIAM FLOWER

发明人： FLOWER WILLIAM

IPC分类号： G01R1/30 ,  H03M1/00 ,  G01R31/00 ,  G01R19/26

CPC分类号： G01R1/30 ,  H03M1/30

摘要： The invention disclosed within this specification pertains particularly to an instrument for digitalizing the output of an analogue device by following a meter movement and counting the meter indications from a given point down to zero.

公开(公告)号：US5396168A

公开(公告)日：1995-03-07

申请号：US858799

申请日：1992-03-27

申请人： Jerry J. Heep ,  Frank P. Mimick

发明人： Jerry J. Heep ,  Frank P. Mimick

IPC分类号： G01R15/12 ,  G01R1/00 ,  G01R19/26

CPC分类号： G01R15/125

摘要： A digital multimeter includes a microprocessor control and a keyboard input. The microprocessor functions to control the display of parameters measured by the meter and displays such measured parameters. The keyboard includes switches to allow the user to select a parameter which is desired to be measured as well as a range of values for that parameter for use in measuring parameters of a device under test connected to the multimeter. The microprocessor communicates with the keyboard and functions to control a resistor and switch network to configure the multimeter to test selected parameters within selected ranges. The multimeter incorporates an overload protection function which compensates for an over-large voltage on the input leads of the multimeter, thus preventing damage to the circuit and to the multimeter.

摘要翻译： 数字万用表包括微处理器控制和键盘输入。 微处理器用于控制由仪表测​​量的参数的显示，并显示这些测量参数。 键盘包括开关以允许用户选择期望测量的参数以及该参数的值的范围，用于测量连接到万用表的测试设备的参数。 微处理器与键盘进行通信，并用于控制电阻和开关网络，以配置万用表来测试选定范围内的选定参数。 万用表包含一个过载保护功能，可以补偿万用表输入引脚上的过大电压，从而防止损坏电路和万用表。

公开(公告)号：US4810953A

公开(公告)日：1989-03-07

申请号：US24690

申请日：1987-03-11

申请人： Tan D. Huynh

发明人： Tan D. Huynh

IPC分类号： G01D1/02 ,  G01D3/02 ,  G01D3/06 ,  G01F23/00 ,  G01R19/26 ,  G01R15/08

CPC分类号： G01D3/066 ,  G01D1/02 ,  G01D3/02 ,  G01F23/0076

摘要： An electronic interface device is provided for use between a sensor and a display unit, including a controllable generator which delivers a signal to the display unit and is connected to an input of a comparator whose other input receives the output signal of the sensor. The output of the comparator controls the up counting or the down counting of an up-down counter of clock pulses. The sign output of the up-down counter controls the generator.

摘要翻译： 提供了一种用于传感器和显示单元之间的电子接口装置，包括可控制的发生器，其将信号传送到显示单元，并连接到比较器的输入端，其另一输入接收传感器的输出信号。 比较器的输出控制时钟脉冲上升计数器的向上计数或递减计数。 升降台的符号输出控制发电机。

公开(公告)号：US4437058A

公开(公告)日：1984-03-13

申请号：US274368

申请日：1981-06-17

申请人： Dainichiro Kinoshita

发明人： Dainichiro Kinoshita

IPC分类号： G01D7/00 ,  G01N27/28 ,  G01R19/252 ,  G01R19/26 ,  G01N27/42

CPC分类号： G01R19/252 ,  G01N27/28

摘要： An indicating device for measuring instruments having a voltage-frequency converter for converting measurement signals expressed as voltage values into frequency signals with a frequency proportional to the voltage values, a counter for counting the frequencies of the frequency signals sent from the voltage-frequency converter and sending the counted number to an indicator for digitally indicating the measured values corresponding to the counted number. A switch is connected between the voltage-frequency converter and the counter, and a controller for holding the switch in the closed state only during a predetermined time is connected to the switch. Analog signals sent from the measuring device can be indicated digitally and the digital values indicated can be held by a simple, inexpensive and miniaturizable construction.

摘要翻译： 一种用于测量仪器的指示装置，具有用于将表示为电压值的测量信号转换成与电压值成比例的频率的频率信号的电压 - 频率转换器，用于对从电压 - 频率转换器发送的频率信号的频率进行计数的计数器， 将计数的数字发送到用于数字地指示对应于计数的测量值的指示符。 开关连接在电压 - 频率转换器和计数器之间，并且仅在预定时间内将开关保持在关闭状态的控制器连接到开关。 从测量装置发送的模拟信号可以数字显示，并且所指示的数字值可以通过简单，便宜且可小型化的结构来保持。