Beaverton, OR, United States
Beaverton, OR, United States

Tektronix, Inc. is an American company best known for manufacturing test and measurement devices such as oscilloscopes, logic analyzers, and video and mobile test protocol equipment. In November 2007, Danaher Corporation acquired Tektronix as a subsidiary. The company received a 2007 Technology & Engineering Emmy Awards for compliance standards monitoring systems for Advanced Television Systems Committee standard and Digital Video Broadcasting transport streams. Several charities are or were associated with Tektronix, including the Tektronix Foundation and the M.J. Murdock Charitable Trust in Vancouver, Washington. Wikipedia.

SEARCH FILTERS
Time filter
Source Type

Patent
Tektronix Inc. | Date: 2017-01-25

A test and measurement instrument including an input configured to receive a reflected and/or transmitted pulse signal from a device under test, a reference clock input configured to receive a reference signal, the reference signal being asynchronous from the reflected pulse signal, a phase reference module configured to acquire samples of the reference signal, a sampling module configured to acquire samples of the reflected pulse signal; and a controller configured to determine a scattering parameter of the device under test based on the acquired samples of the reference signal and the acquired samples of the reflected pulse signal.


Embodiments of the invention include a network-based timing instrument that has a master unit and an internal switch that communicate with a slave device. The master unit includes a timing compensator. The internal switch is coupled to the master unit by the internal network and is also coupled to an external network that is outside of the network-based timing instrument. The internal switch is structured to provide speed information of the internal network and the external network to the master unit, and the timing compensator of the master unit is modified based on the speed information provided by the internal switch. The master unit may also modify the timing compensator based on a message length of messages sent by the master unit. Also the internal switch may be structured to provide incoming and/or outgoing message residence time information to the master unit, and the master unit may modify the timing compensator based on such residence time information. The same techniques may be applied to a slave node of a network-based timing instrument. Methods of adjusting network timing compensation of a network-based timing device are also described.


A method of detecting image quality in a wavelet transform-encoded image includes receiving wavelet transform-encoded image data partitioned into tiles, each tile partitioned into a number of subbands, evaluating a number of wavelets in fewer than the number of subbands, assigning a measure to each of the subbands evaluated for each tile, using the measures to determine a perceptual visual quality score for the image, and adjusting operation of the decoder based upon the perceptual visual quality score. A decoding system includes a memory to receive wavelet-transformed compressed image data having a predetermined number of subbands, and a decoder to determine a number of wavelet coefficients in a subset of the predetermined number of subbands, measure an amount of blur in the image data based upon the number of wavelet coefficients, and adjust a decoding process based upon the amount of blur.


Patent
Tektronix Inc. | Date: 2017-03-08

A probe for making electrical contact with a device-under-test test point includes a body, a rigid member capable of travelling linearly with respect to the body, a flexible arm having a test point contact at one end and fastened to the rigid member at the other end, and a flexible linkage fixed to the body and to the flexible arm. The flexible linkage is structured to cause the flexible arm to bend in response to travel of the rigid member in one direction, and to cause the flexible arm to unbend in response to travel of the rigid member in the other direction. A second flexible arm may be included, the two arms opening and closing to change the distance between test point contacts. A light source may be disposed on a portion of the flexible linkage that simultaneously articulates to automatically track the orientation of the test point contact.


Patent
Tektronix Inc. | Date: 2017-01-04

A test and measurement instrument including an input port configured to receive an input signal. One or more divider circuits, coupled to the input port, employ a plurality of divide ratios such that each divide ratio scales an event signal indicating events in the input signal by a predetermined integer value. A control system is also included. The control system is configured to iteratively determine an estimated signal frequency of the event signal, and automatically select a divide ratio for the event signal based on the estimated signal frequency. The instrument may also include one or more counters to count triggers in the event signal subsequent to application of the divide ratio. The instrument may also employ frequency hysteresis to prevent chatter in divide ratio selection.


Patent
Tektronix Inc. | Date: 2017-02-15

Embodiments of the present invention provide an improved cable assembly for connecting an electrical test and measurement probe to a device under test. One end of the probe is connected to a device under test (DUT), while the other end is connected to the instrument through one or more cables. To prevent mechanical stresses to the probe-DUT interface caused by the cables resistance to bending and twisting, embodiments of the improved cable assembly use one or more pliable spines to hold the cable assembly in position after it has been bent or twisted. This provides a more secure connection to the DUT and prevents damage to the probe-DUT interface. Each spine is anchored to the tip of the probe, and may be further secured by an outer housing or additional anchors. A flexible boot may surround the cable assembly and/or outer housing, further protecting the cables from damage. Alternatively, one or more spines may be placed inside the boot.


A test and measurement instrument, including a splitter configured to split an input signal into two split input signals and output each split input signal onto a separate path and a combiner configured to receive and combine an output of each path to reconstruct the input signal. Each path includes an amplifier configured to receive the split input signal and to compress the split input signal with a sigmoid function, a digitizer configured to digitize an output of the amplifier; and at least one processor configured to apply an inverse sigmoid function on the output of the digitizer.


A system and method of multi-symbol communications from a transmitter to a receiver via a channel, including transmitting signals as a waveform representing a sequence of symbols, each symbol of unit-interval duration and each symbol associated with its own signal level. This method includes graphically representing the waveform as an eye diagram having a horizontal time axis and a vertical signal level axis arranged to form one or more eyes, and using a sampling point in each eye to determine which signal the waveform in any unit interval represents. Each sampling point has a phase and a decision threshold. The method further includes identifying the eyes in the eye diagram, finding a convex polygonal region fitting within each eye, finding a largest rectangle fitting the convex polygonal region of each eye, and positioning the sampling point in each eye at a center of the rectangle of that eye.


Patent
Tektronix Inc. | Date: 2017-02-22

A connector (100) for terminating a cable (101) including a compressible fitting (102) and a crimp nut (103). The compressible fitting (102) has an inner passage (118) to receive a portion (105) of the cable (101) and a threaded outer wall (117) coaxial with and surrounding the inner passage (118). The outer wall (117) includes a first slot (111) extending radially through the outer wall (117) and axially away from a first end (120) of the outer wall (117). The crimp nut (103) is configured to thread onto the outer wall (117) of the compressible fitting (102). The crimp nut (103) is further configured, in a first position (126), not to constrict the inner passage (118) and, in a second position (127), to radially compress the outer wall (117) of the compressible fitting (102) to reduce a bore diameter (128) of the inner passage (118) and to electrically connect the outer wall (117) with the portion (105) of the cable (101) received in the inner passage (118) of the compressible fitting (102). Methods are also disclosed.


A test and measurement instrument, including a splitter configured to split an input signal having a particular bandwidth into a plurality of split signals, each split signal including substantially the entire bandwidth of the input signal, a plurality of harmonic mixers, each harmonic mixer configured to mix an associated split signal of the plurality of split signals with an associated harmonic signal to generate an associated mixed signal, a plurality of digitizers, each digitizer configured to digitize a mixed signal of an associated harmonic mixer of the plurality of harmonic mixers, and a linear time-periodic filter configured to receive the digitized mixed signal from each of the digitizers and output a time-interleaved signal. A first-order harmonic of at least one harmonic signal associated with the harmonic mixers is different from a sample rate of at least one of the digitizers.

Loading Tektronix Inc. collaborators
Loading Tektronix Inc. collaborators