Hewlett-packard Company

Agilent Technologies, Inc.

Keysight Technologies, Inc.

Warren S Tustin

Matthew S Holcomb

Douglas James Beck

Michael R Fender

A method and test system are provided for selectively emphasizing waveforms on a display of the test system. The method includes presenting a graphical user interface (GUI) on the display of the test system; receiving through the GUI a selection of channels to be viewed on the display; receiving through the GUI an indication enabling a waveform emphasis feature; receiving through the GUI an indication of a cycle time; and displaying through the GUI multiple waveforms, respectively produced by the selected channels, by sequentially emphasizing each waveform of the multiple waveforms for the cycle time as a viewable waveform, while de-emphasizing each remaining waveforms of the multiple waveforms in relation to the emphasized waveform for the cycle time.

System and method for selectively displaying waveforms using graphical user interface

Systems and methods for performing multi-measurements are provided. One such method includes: displaying a first icon corresponding to a multi-source measurement, displaying waveforms, visually associating the first icon with at least one of the waveforms responsive to user input, and performing a multi-source measurement related to the waveforms.

Systems and methods for performing multi-source measurements

A self-framing serial trigger within an oscilloscope or specialized analyzer construes an absence of the data's clock signal for at least a selected length of time as implying the occurrence of a framing signal. This frees the serial trigger from otherwise needing an externally supplied framing signal. The serial trigger may include a shift register containing the most recent N-bits of the data, which is then bit-wise compared to the trigger pattern (stored in a register). This level of comparison may provide for don't care bits in the trigger pattern. The results of this bit-wise comparison are then inspected for a certain uniformity indicating that the trigger pattern has been matched. An additional circuit may count clock signals since the last implied framing pulse. If this additional count has not yet reached M (or counted down from M to zero) the match is premature, and no trigger signal is generated. The implied framing signal itself may be generated by loading a down counter with a preselected value each time a selected edge occurs in the clock for the data. The down counter is clocked by a high speed clock running several times faster than the clock for the data. If the down counter ever reaches zero a framing pulse is implied. The implied framing pulse may be generated by decoding a value of zero in the down counter.

Self-framing serial trigger for an oscilloscope or the like

An oscilloscope has a trigger circuit which is operable in any one of three different modes. The trigger circuit has a number of edge detect circuits which generate pulses in response to a rising edge, falling edge, or both rising and falling edges of one or more signals. The trigger circuit has a multiplexer which routes one of three signal sources depending upon the selected mode. With a first mode, the multiplexer routes signals from a pattern detect circuit and the trigger circuit operates in a conventional manner to trigger based on the duration of the signal. In the second mode, the multiplexer routes signals from one edge detect circuit and the trigger circuit measures the frequency or rate of the signal. In the third mode, the multiplexer routes signals from a flip-flop which generates a pulse based upon the outputs from two different edge detect circuits and can be configured to measure setup or hold violations between two signals. The trigger circuit according to the invention can therefore trigger on events more complex than just the duration of a signal and provides this triggering ability without the need for any instrument or circuitry external to the oscilloscope.

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Colorado Springs, CO, United States of America

Warren S Tustin