公开(公告)号：US20140218064A1

公开(公告)日：2014-08-07

申请号：US13901430

申请日：2013-05-23

Applicant: Keithley Instruments, Inc.

Inventor： James A. Niemann

IPC: G01R31/26

CPC classification number: G01R31/2601 ,  G01R31/2607 ,  G01R31/2612

Abstract: An RF testing method and system by which a DC measurement pathway can also act like a properly terminated RF pathway. Achieving this requires that the output HI, LO, and Sense HI conductors are terminated in a frequency selective manner such that the terminations do not affect the SMU DC measurements. Once all SMU input/output impedances are controlled, as well as properly terminated to eliminate reflections, the high-speed devices will no longer oscillate during device testing, so long as the instruments maintain a high isolation from instrument-to-instrument (separate instruments are used on the gate and drain, or on the input and output of the device). The output of HI, LO and Sense HI conductors are coupled to various nodes of the DUT via three triaxial cables, the outer shieldings of which are coupled to each other and to an SMU ground.

Abstract translation: RF测试方法和系统，通过该测试方法和系统，DC测量路径也可以像正确终止的RF路径那样起作用。 实现这一点要求输出HI，LO和Sense HI导体以频率选择性方式终止，使得终端不影响SMU DC测量。 一旦所有的SMU输入/输出阻抗被控制，并且正确终止以消除反射，高速器件将不再在器件测试期间振荡，只要仪器保持与仪器到仪器的高度隔离（分离的仪器 用于栅极和漏极，或器件的输入和输出）。 HI，LO和感测HI导体的输出通过三根三轴电缆耦合到DUT的各个节点，其外屏蔽彼此耦合并连接到SMU接地。

公开(公告)号：US10746761B2

公开(公告)日：2020-08-18

申请号：US15015893

申请日：2016-02-04

Applicant: Keithley Instruments, Inc.

Inventor： Michael D. Rayman ,  Gregory Sobolewski

IPC: G01R31/20 ,  G01R1/02 ,  G01R1/067 ,  G01R31/319 ,  G01R31/28 ,  G01R1/04

Abstract: A connection interface for connecting one or more devices under test (DUTs) to one or more remote test and measurement instruments includes a device-under-test connector for connecting a DUT to the interface, a host-instrument connector for connecting the interface to a host test and measurement instrument, and an electrical path between the device-under-test connector and the host-instrument connector. The connection interface also includes a display that has a first portion visually associated with the device-under-test connector and configured to display an identifier for a particular connection point on the DUT. In some embodiments, the first portion of the display is configured to display measurement data from the particular connection point on the DUT. In some embodiments, the display has a second portion that is configured to display information related to the host test and measurement instrument, or to display a name for a particular measurement of the DUT.

公开(公告)号：US20170205988A1

公开(公告)日：2017-07-20

申请号：US15395812

申请日：2016-12-30

Applicant: Keithley Instruments, Inc.

Inventor： George J. Polly ,  Brian P. Frackelton

IPC: G06F3/0481 ,  G06T11/00 ,  G06T11/60

CPC classification number: G06F3/04817 ,  G01R1/025 ,  G05B19/0423 ,  G05B2219/23258

Abstract: An electronic device for running an application can include a display to visually present a user interface corresponding to the application. The electronic device can also include a processor to determine whether the application is an originally-installed application and cause the display to include a visually identifiable feature in the user interface indicating that the application is not an originally-installed application responsive to a determination that the application is not an originally-installed application.

公开(公告)号：US20160118899A1

公开(公告)日：2016-04-28

申请号：US14523745

申请日：2014-10-24

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M1/40 ,  H02M3/3372

Abstract: A method of magnetization balancing for a switching power supply having at least two MOSFETs can include measuring first and second commutation times, adjusting the timing of the on time (pulse width) of the first MOSFET's gate relative to the on time (pulse width) of the second MOSFET's gate, and determining whether the commutation times are equal.

Abstract translation: 用于具有至少两个MOSFET的开关电源的磁化平衡方法可以包括测量第一和第二换向时间，调节第一MOSFET栅极的导通时间（脉冲宽度）的时序（脉冲宽度）相对于导通时间 第二MOSFET的栅极，并确定换向时间是否相等。

公开(公告)号：US09274145B2

公开(公告)日：2016-03-01

申请号：US13657549

申请日：2012-10-22

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: G01R1/30 ,  G01R1/20 ,  H03F3/45 ,  G01R19/00 ,  H03F1/34

CPC classification number: G01R1/203 ,  G01R19/0023 ,  G01R19/0092 ,  H03F1/34 ,  H03F3/45475 ,  H03F2200/261 ,  H03F2203/45138

Abstract: An active shunt ammeter for measuring current flowing through a device under test (DUT) and method are disclosed. The active shunt ammeter includes an input configured to receive an input signal having a frequency within a frequency band and representing the current flowing through the DUT. An output is configured to generate an output voltage representing the current flowing through the DUT. The active shunt ammeter also includes a gain circuit having an amplifier with a gain characteristic that varies respect to frequency within the frequency band and a feedback element having an impedance coupled from an output of the gain circuit to a negative input of the gain circuit, the feedback element impedance being configured to change with frequency to correlate with the amplifier gain characteristic such that the feedback element impedance divided by the amplifier gain over the frequency band has minimal frequency dependency.

Abstract translation: 公开了一种用于测量流过被测器件（DUT）的电流的主动分流电流表和方法。 主动分流电流表包括被配置为接收具有在频带内的频率并且表示流过DUT的电流的输入信号的输入。 输出被配置为产生表示流过DUT的电流的输出电压。 主动分流电流表还包括具有增益特性的放大器的增益电路，该放大器具有与频带内的频率相关的增益特性，以及具有从增益电路的输出耦合到增益电路的负输入的阻抗的反馈元件， 反馈元件阻抗被配置为随频率变化以与放大器增益特性相关，使得反馈元件阻抗除以频带上的放大器增益具有最小的频率依赖性。

公开(公告)号：US20140111186A1

公开(公告)日：2014-04-24

申请号：US13658055

申请日：2012-10-23

Applicant: KEITHLEY INSTRUMENTS, INC.

Inventor： James A. Niemann

IPC: G01R17/02

CPC classification number: G01R31/2839 ,  G01R1/203 ,  G01R15/12

Abstract: An impedance sourcing circuit for a measurement device configured to measure a device under test (DUT) and method are disclosed. The impedance sourcing circuit includes a voltage/current source. An electrically controlled variable resistance having a control input is configured to adjust the variable resistance is coupled to the DUT. A loop gain controller is coupled to the control input of the electrically controlled variable resistance. The loop gain controller is configured to drive the control input of the electrically controlled variable resistance to adjust the variable resistance to generally match the impedance of the DUT. The impedance sourcing circuit may also include a voltage detector configured to detect a voltage across the DUT and a voltage reference. The loop gain controller may be configured to drive the control input of the electrically controlled variable resistance based on the voltage detected across the DUT and the voltage reference.

Abstract translation: 公开了一种用于测量被测设备（DUT）和方法的测量装置的阻抗源电路。 阻抗源电路包括电压/电流源。 具有控制输入的电控可变电阻被配置为调节可变电阻耦合到DUT。 环路增益控制器耦合到电控可变电阻的控制输入端。 环路增益控制器被配置为驱动电控可变电阻的控制输入以调整可变电阻以大致匹配DUT的阻抗。 阻抗源电路还可以包括被配置为检测DUT两端的电压和电压基准的电压检测器。 环路增益控制器可以被配置为基于在DUT和电压基准上检测的电压来驱动电控可变电阻的控制输入。

公开(公告)号：US09847724B2

公开(公告)日：2017-12-19

申请号：US14876538

申请日：2015-10-06

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: H02M3/335 ,  H02M3/337 ,  H02M1/34

CPC classification number: H02M3/33507 ,  H02M3/33569 ,  H02M3/337 ,  H02M2001/342 ,  H02M2001/344 ,  Y02B70/1491

Abstract: Embodiments of the present invention provide improved techniques and devices for reducing transformer commutation distortion caused by large load currents. Traditional power supplies which have two or more phases typically commutate a transformer during the end of each phase. When the load current is large, energy stored in the transformer's leakage inductance can cause undesirable effects during commutation. Embodiments of the present invention reduce these effects by lowering the voltage across the primary side of the transformer prior to commutation. In one embodiment, a capacitor is added to the primary side of the transformer. A switch directs current through the capacitor prior to commutation, allowing the capacitor to absorb the transformer's leakage inductance energy and lower the primary side voltage. Other suitable components, such as resistors, diodes, transistors, or additional transformer windings, may also be used to reduce the primary-side voltage prior to commutation.

公开(公告)号：US09541584B2

公开(公告)日：2017-01-10

申请号：US13849265

申请日：2013-03-22

Applicant: Keithley Instruments, Inc.

Inventor： Wayne Goeke

IPC: G01R1/30 ,  G01R17/16 ,  G01R19/00 ,  G01R19/25 ,  G01R15/22

CPC classification number: G01R19/2503 ,  G01R15/22

Abstract: A system may include two input terminals, e.g., HI and LO, and a floating circuit that is physically separate from the input terminals and includes a gain amplifier. The floating circuit can be surrounded by a conductive enclosure that is electrically connected to the second input terminal. The floating circuit can further switch between input signals received from the first and second input terminals to the gain amplifier and the floating circuit ground.

Abstract translation: 系统可以包括两个输入端子，例如，HI和LO，以及物理上与输入端子分离并包括增益放大器的浮置电路。 浮动电路可以被电连接到第二输入端子的导电外壳包围。 浮动电路可以进一步在从第一和第二输入端子接收的输入信号之间切换到增益放大器和浮置电路接地。

公开(公告)号：US09326369B2

公开(公告)日：2016-04-26

申请号：US13921550

申请日：2013-06-19

Applicant: Keithley Instruments, Inc.

Inventor： James A. Niemann ,  Gregory Sobolewski ,  Martin J. Rice ,  Wayne Goeke

IPC: H05K1/02 ,  H05K3/40 ,  H05K3/46 ,  H05K3/30 ,  H05K1/14

CPC classification number: H05K1/0213 ,  H05K1/0225 ,  H05K1/0256 ,  H05K1/142 ,  H05K1/145 ,  H05K3/306 ,  H05K3/4038 ,  H05K3/4697 ,  H05K2201/0792 ,  H05K2201/09063 ,  H05K2201/093 ,  H05K2201/09618 ,  H05K2201/0969 ,  H05K2201/09981 ,  Y10T29/49139

Abstract: A device with low dielectric absorption includes a printed circuit board (PCB), a component connection area including a first conductor layered on a top surface of the component connection area and a second conductor layered on a bottom surface of the component connection area, an aperture surrounding the component connection area, a low-leakage component connecting the component connection area to the PCB across the aperture, and a guard composed of a third conductor at least substantially surrounding the aperture on a top surface of the PCB and a fourth conductor at least substantially surrounding the aperture on a bottom surface of the PCB.

Abstract translation: 具有低介电吸收率的器件包括印刷电路板（PCB），包括层叠在部件连接区域的顶表面上的第一导体的部件连接区域和层叠在部件连接区域的底表面上的第二导体， 围绕部件连接区域，将部件连接区域连接到穿过孔的PCB的低泄漏部件以及由至少基本上围绕PCB顶表面上的孔的第三导体组成的防护件和至少 基本上围绕PCB的底表面上的孔。

公开(公告)号：US20160091994A1

公开(公告)日：2016-03-31

申请号：US14711572

申请日：2015-05-13

Applicant: Keithley Instruments, Inc.

Inventor： F. Joseph Frese, IV

IPC: G06F3/0354 ,  G06F3/0488 ,  G06F3/0481 ,  G06F3/0484 ,  G06F3/041 ,  G06F3/01

CPC classification number: G06F3/04847 ,  G06F3/04883

Abstract: A method including displaying an orthogonal grid on a touchscreen display. The touchscreen display is in communication with a test and measurement instrument. The orthogonal grid has an axis that is associated with a controlled output parameter of the test and measurement instrument. The method also includes detecting a touch input at the touchscreen display. The touch input includes a continuous slide gesture made by a user substantially along the axis of the orthogonal grid. The slide gesture begins at a first location on the axis and ends at a second location on the axis. Also, the method includes adjusting the controlled output parameter of the test and measurement instrument from an initial value to an adjusted value. The initial value corresponds to the first location of the slide gesture and the adjusted value corresponds to the second location of the slide gesture. Systems are also disclosed.

Abstract translation: 一种方法，包括在触摸屏显示器上显示正交网格。 触摸屏显示器与测试和测量仪器通信。 正交网格具有与测试和测量仪器的受控输出参数相关联的轴。 该方法还包括检测触摸屏显示器上的触摸输入。 触摸输入包括基本上沿着正交网格的轴线由用户进行的连续滑动手势。 滑动手势从轴上的第一个位置开始，并在轴上的第二个位置终止。 此外，该方法包括将测试和测量仪器的受控输出参数从初始值调整到调整值。 初始值对应于滑动手势的第一位置，并且调整后的值对应于滑动手势的第二位置。 还披露了系统。