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Cleveland, OH, United States

Patent
Keithley Instruments Inc. | Date: 2015-09-04

Embodiments of the present invention provide an improved two-cable connection system for connecting electrical test instrumentation to a device under test (DUT). In one embodiment, a single pair of equal-length triaxial cables each has a desired characteristic impedance. Each cable has a center connecter, intermediate conductor, and outer conductor. The proximal end of each cable is connected to the test instrumentation, and the distal ends are located at the DUT. At the distal end, the center conductors are connected to the DUT, the intermediate conductors are allowed to float, and the outer conductors are connected to each other. The proximal end of each cable is connected to the device using an appropriate connection for the test that will be performed. This allows the test instrumentation to perform different types of tests without changing connections to the DUT.


Patent
Keithley Instruments Inc. | Date: 2013-05-24

An isolated DC-to-DC switching power supply includes an isolation transformer having a magnetic core, a first winding around the magnetic core, a first winding-shield around the magnetic core, a second winding-shield within the first winding-shield, and a second winding within the second winding-shield. There is no direct coupling between the first winding and the second winding since the second winding is enclosed within the second winding-shield and the second winding-shield is enclosed within the first winding-shield.


Patent
Keithley Instruments Inc. | Date: 2014-10-24

A circuit structured to drive an isolated high speed voltage metal-oxide-semiconductor field-effect transistor (MOSFET) switch, including a first MOSFET and a second MOSFET configured to operate as a switch, a capacitor, a charging component in parallel with the capacitor, a first switch in series with the charging component, and a second switch in parallel with the charging component and the capacitor. The stored voltage in the capacitor is sent to the gates of the first MOSFET and the second MOSFET when a second switch is open and a first switch is closed.


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.


Patent
Keithley Instruments Inc. | Date: 2013-05-30

A circuit can include operational amplifier having a first input, a second input, and an output, first and second resistors in series between the output of the op-amp and a ground, and multiple switches configurable to toggle the circuit between a positive phase and a negative phase.

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