Assignee: Keithley Instruments, Inc.

Location: Cleveland, OH
No. of patents: 62

Number	Title	Issue Date
8099739	Java applet management method A method for managing Java applets in HTML pages, the HTML pages being rendered by a web browser, includes: browsing a page having an applet, the applet being loaded into the page and creating a connection to a server; leaving the page, the applet providing an idle ...	01/17/2012
8059639	Switch matrix A switch matrix for selectively connecting at least one of N signal inputs to at least one of M signal outputs, N and M being integers greater than two, includes a cluster of N input switches arranged about each of the M signal outputs resulting in at least M cluste...	11/15/2011
8055468	Output leakage compensation and method for implementing the same An electronic instrument having in its circuitry a specific solid state switch that exhibits detrimental current leakage at elevated temperatures, a variable voltage device in the instrument connected to the specific switch, the variable voltage device being capable...	11/08/2011
7948248	Cable length correction A transmission line impedance compensation method includes the step of providing a measurement device that is adapted to source a test signal having a frequency to a device under test and to determine a corresponding impedance of the device under test using an auto-...	05/24/2011
7923985	Active autoranging current sensing circuit A range-changing circuit for a measurement device having a desirable range includes an array of graduated impedances. And amplifier supplies an electrical voltage to at least one of the impedances of the array. A voltage sensing and limiting switch is provided in a ...	04/12/2011
7920038	Dual shielded relay Provided is a relay that includes first and second contacts that are selectively connectable for closing an electric circuit. A coil wound around the contacts along a longitudinal axis can generate a magnetic field that connects the contacts in one of an energized o...	04/05/2011
7906977	Dual output stage source measure circuit A circuit for alternatively controlling a current through a device and permitting measurement of a voltage across the device or controlling a voltage across the device and permitting measurement of a current through the device includes a sense impedance in series co...	03/15/2011
7872481	Low glitch multiple form C summing node switcher A measurement system with selectable feedback paths includes a DUT interface including a first and a second DUT sensor, the first sensor being connected to a first feedback path for providing a measure of a first DUT characteristic, the second sensor being connected...	01/18/2011
7868692	Low noise and common mode current power supply A power supply includes: a switching amplifier including an input and an output, the amplifier input being adapted to be powered by an electrical power source; a transformer including a primary and a secondary winding on a magnetic core, the number of winding turns ...	01/11/2011
7855544	AC low current probe card A probe system for connecting a measurement apparatus to a DUT includes an AC probe having an AC shield conductor and an AC probe conductor shielded by the AC shield; a first DC probe having a first DC probe conductor and a first guard conductor for guarding the fir...	12/21/2010
7853425	Parallel testing in a per-pin hardware architecture platform Provided is a method and system for testing a DUT. The system includes a plurality of testing devices for interacting with the DUT and conducting a plurality of different tests on the DUT, and a computer-readable memory for storing computer-executable instructions d...	12/14/2010
7834641	Phase-gain calibration of impedance/admittance meter A method for calibrating an impedance/admittance meter for measurements of a DUT includes measuring a pure capacitance at a desired frequency; using the capacitance measurement to establish the phase response of the meter; measuring the admittance value of a resisto...	11/16/2010
7724017	Multi-channel pulse tester A method for testing a plurality of DUTs using a plurality of DC instruments and a pulsed instrument includes contemporaneously applying DC signals to the DUTs with respective DC instruments and sequentially performing pulsed measurements on the DUTs with the pulsed...	05/25/2010
7683650	Measurement instrument with synchronized interference signals An instrument for measuring electrical parameters includes a measurement section having a measurement aperture; and a support section providing at least one of power and digital control for the measurement section. The support section has an interference signal freq...	03/23/2010
7683647	Instrument per pin test head A test head for testing a DUT includes a probe card having a plurality of DUT probes, the probes being in contact with the DUT during the testing; an instrument carrier, the instrument carrier being located above the DUT during the testing; and a SMU mounted on the ...	03/23/2010
7680621	Test instrument network A test instrument network for testing a plurality of DUTs includes a plurality of communicating script processors, the script processors being adapted to execute computer code; and a plurality of measurement resources controllable by the script processors in respons...	03/16/2010
7680619	Parallel test architecture A measurement system for testing a DUT includes a plurality of procedures for performing test functions, each procedure having a phase variable; a task queue where the procedures are entered in the task queue with a sign-up value of the phase variable; and a multiph...	03/16/2010
7633308	Combined pulse and DC test system A system for making HF and DC measurements on a DUT includes a HF unit having a HF connection terminal that is switchable to a connected or disconnected state; a DC unit having a DC connection terminal that is switchable to a connected or disconnected state; and a c...	12/15/2009
7616088	Low leakage inductance transformer A toroidal step-up or step-down transformer includes a toroidal magnetic core, a primary formed from a plurality of primary windings, and a secondary formed from a plurality of secondary windings. Parallel connected windings are added to at least one of the primary ...	11/10/2009
7616014	Pulsed I-V measurement method and apparatus A method and apparatus for measuring a pulsed I-V characteristic of a DUT that has a signal terminal and a return terminal includes connecting a pulse unit between the signal and return terminals, the pulse unit having a pulse source and a pulsed current measuring d...	11/10/2009
7616008	Digital auto balance bridge An AC impedance measurement system is used for measuring the impedance of a DUT. A measured voltage is applied to a first DUT terminal by a first digital to analog converter, the voltage appearing at the second terminal of the DUT is monitored through an analog to d...	11/10/2009
7614274	Method for calibration adjustment verification A method for verifying the adjustment of a plurality of measurement instruments includes measuring a first value of an un-verified test value of a parameter with a first measurement instrument; measuring a second value of the same un-verified test value of a paramet...	11/10/2009
7586314	Multi-pin CV measurement A method for measuring electrical parameters of a DUT having at least three terminals includes applying a first AC voltage to a first terminal; separately driving a second and a third terminal each to a virtual second AC voltage, each virtual voltage requiring a res...	09/08/2009
7568946	Triaxial cable with a resistive inner shield A triaxial cable having a center conductor; an outer shield conductor coaxial with the center conductor; and an inner shield conductor coaxial with the center conductor and located between the center conductor and the outer shield conductor. The inner shield conduct...	08/04/2009
7545155	Parallel AC measurement method A method for making electrical measurements of a first and a second DUT, the DUTs being in sufficient proximity to exhibit crosstalk therebetween, the method comprising: applying a first signal to the first DUT; applying a second signal to the second DUT, the first ...	06/09/2009
7518378	Cable compensation for pulsed I-V measurements The errors related to the resistance of test conductors and sense/load resistances for a pulse I-V measurement system are determined by making open circuit and through circuit measurements using a combination of DC and pulse instrument measurements. ...	04/14/2009
7508240	Power mains zero-crossing detector A zero-crossing detector includes a pair of input terminals, the terminals being adapted to receive an AC input signal; a rectifier, the rectifier rectifying the AC input signal; a current source, the current source being powered by the rectified AC input signal; an...	03/24/2009
7498854	High speed solid state switch A solid state switch includes a solid state device having an input terminal, an output terminal and a gate terminal; a quick response circuit selectively operable to initially place the solid state device in a conducting state; and a sustained response circuit selec...	03/03/2009
7482961	Digital feedthrough cancellation A method for operating a DAC to minimize digital feedthrough includes inputting a clock signal to a DAC clock input, the clock signal having a periodic series of trigger events, wherein input data must be present for a time window between a setup time before a trigg...	01/27/2009
7425837	Spatial transformer for RF and low current interconnect A spatial transformer includes an insulating substrate; a plurality of test terminal assemblies on the substrate; and a plurality of contact surfaces on the transformer, each providing an interconnection point for electrical connection between a respective test term...	09/16/2008
7414414	Spatially distributed guarded impedance A guarded sense impedance for use in a measurement instrument includes a sense impedance adapted to have a spatially distributed electrical potential and at least one guard structure adapted to have the spatially distributed electrical potential. The guard structure...	08/19/2008
7388366	Test system connection system with triaxial cables A connection system for connecting test equipment to a device under test (DUT) includes a first pair of equal-length triaxial cables, each having a desired characteristic impedance between a center conductor and an outer conductor, the outer conductor of each first ...	06/17/2008
7342401	Measurement bias tee A bias tee for connecting a measurement device to a DUT, where the measurement device has a guard output, includes a DC port; a HF port; and a measurement port. The HF input port is guarded with the guard output during operation of the bias tee. ...	03/11/2008
7280929	Method and apparatus for pulse I-V semiconductor measurements A method for measuring a value of an electrical characteristic of a device under test in a circuit having a load impedance includes applying a voltage to said circuit, the voltage having a selected amplitude; measuring a current in the circuit in response to the vol...	10/09/2007
7276893	Automatic ranging current shunt A range-changing circuit includes an array of graduated impedances in serial relationship, and a voltage sensing and limiting switch across one of said impedances. The switch limits the voltage across said one of the impedances in response to a voltage sensed by the...	10/02/2007
7240258	Parallel test system and method A parallel test device for testing a DUT includes a controller that has a test procedure useful for both sequential and parallel testing, a test regimen that includes a parallel procedure, and a parallel wrapper applied to the test procedure to provide the parallel ...	07/03/2007
7224160	RF and pulse bias tee A RF and pulse bias tee for use with a source measure unit (SMU) includes a SMU source terminal; a SMU measure terminal; an output terminal; a SMU measure terminal pulse/RF block between the SMU measure terminal and the output terminal; a SMU source terminal high fr...	05/29/2007
7205773	Method for calibrating a pulsed measurement system A method for calibrating a pulsed measurement system, the system having a pulse generator unit, a measurement unit and a probe unit having a first and a second probe tip. The first tip, the pulse generator unit and the measurement unit are all interconnected by resp...	04/17/2007
7202676	Source measure circuit A circuit for alternatively controlling a current through a device and permitting measurement of a voltage across the device or controlling a voltage across the device and permitting measurement of a current through the device includes a sense impedance in series co...	04/10/2007
7009486	Low noise power transformer A printed circuit board transformer has primary and secondary windings. The transformer includes a printed circuit board having a plurality of traces forming a plurality of first portions of the primary and secondary windings, an annular magnetic core adjacent to th...	03/07/2006

«First «Previous1 2 Next»Last»

PatentStorm

Quotables

PatentStorm News

Assignee: Keithley Instruments, Inc.