Tektronix, Inc.

P E Ramesh

Srikrishna H Nadig

John J Pickerd

Tsuyoshi Miyazaki

Godfree Coelho

Darshan Mehta

K T Anurag

Roger Lo

A test monitor extracts waveforms from a differential transmission line of an automobile network without disrupting the differential transmission line, and stores the data decoded from the extracted waveforms. The test monitor includes a first input configured to receive a voltage waveform from a voltage probe electrically coupled to the differential transmission line that electrically connects a first ECU device and a second device, a second input configured to receive a current waveform from a current probe electrically coupled to the differential transmission line, and one or more processors configured to receive the voltage waveform and the current waveform and determine a voltage of the first ECU device and a voltage of the second device based on the voltage waveform and the current waveform. The test monitor may be embodied in an FPGA. The test monitor enables monitoring of message transfers across a network in a non-intrusive and non-invasive manner, without the necessity of using a repeater or switch.

Test monitor including signal separator and data recorder

A test and measurement instrument for extracting waveforms from a differential transmission line without disrupting the differential transmission line. The test and measurement instrument includes a first input configured to receive a voltage waveform from a voltage probe electrically coupled to the first and second lines of the differential transmission line that electrically connect a first device and a second device, a second input configured to receive a current waveform from a current probe coupled to the differential transmission line, and one or more processors configured to receive the voltage waveform and the current waveform and determine a voltage of the first device and a voltage of the second device based on the voltage waveform and the current waveform.

Device signal separation for full duplex serial communication link

A system and method for performing power spectral density (PSD) and power level measurements for measuring PSD required by 10GBaseT applications, using a single test and measurement instrument, such as a real time oscilloscope is described. That is, an oscilloscope includes processing circuitry which receives an input signal and converts it to raw data, it then transforms the raw data into specific analyzed displayable data by algorithmically deriving PSD from spectral data and plotting the PSD data along with limit values on a display screen of the oscilloscope.

System and method for performing power spectral density and power level measurements

An oscilloscope performs an in-circuit measurement of voltage across, and current through, a core winding of an inductor, and derives the actual B and H values with n number of turns, receives data indicative of the magnetic length of the circuit, and plots the B_H curve. The oscilloscope then derives the value of Saturation flux density (Bsat), Remnant flux density (Br), Permeability (&#x3bc;), and Coercivity (Hc) from this B-H plot. Characterizing the operating region of the magnetic component while it operates in a Switch Mode Power Supply (SMPS) under test, provides information concerning the stability of the power supply that was heretofore unavailable.

In-circuit measurement of saturation flux density Bsat, coercivity Hc, and permiability of magnetic components using a digital storage oscilloscope

A method and apparatus for measuring inductance. The method and apparatus include processing current and voltage waveform data associated with an inductive device to determine edge and slope parameters for each of a plurality of current waveform data cycles. Furthermore, proportional magnetic flux and proportional magnetic current is determined from the acquired current waveform data and the voltage waveform data proximate determined edge regions of the waveform data. An inductance value of the inductive device may then be calculated from the proportional magnetic flux and proportional magnetic current.

Measurement of inductance using a digital storage oscilloscope under real-time operating environments

A method and apparatus for identifying and analyzing high power dissipation peaks across a switching device. The method and apparatus include processing voltage waveform data associated with a switching device to determine switching edge and slope parameters for each of a plurality of switching cycles, and identifying those portions of the voltage waveform data associated with switch state transition portions of the plurality of switching cycles. For a plurality of the identified switch state transition portions, respective peak power levels are calculated using portions of the voltage waveform data temporally corresponding to the plurality of identified switch state transitions, and portions of current waveform data associated with the switching device temporally corresponding to the plurality of identified switch state transitions.

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Bengaluru, India

P E Ramesh