Abstract: A method and apparatus for synchronizing presentation of multi-domain measurements using actual or quasi 3-D representation. The synchronization between data streams acquired in different measurement domains is performed by using timestamps, a common trigger event, or a common clock, or a combination of any or all of them. In this way, for example, a transient anomaly in the RF spectrum of a communications signal may be correlated with, and displayed with, a related corrupted data communications packet.

Abstract: A real-time data display in a control window of a measurement instrument receives real-time data corresponding to an application, wherein the real-time data is to be displayed to a user. A control window is also displayed, including one or more user-selectable options within the control window and at least a portion of the real-time data within a portion of the control window. A user selection of an option to alter a display of the real-time data is then received, and the real-time data being displayed is altered within the portion of the control window in accordance with the user-selected option.

Abstract: A user interface for a tester or simulator includes a menu for creating templates. The templates organize a set of the user's decisions regarding the timing, direction, and masking of all of the signals occurring during one tester cycle into a convenient form for use in another menu where test vectors are actually specified. In this other menu, the templates serve as a shorthand way of describing the function of each channel and its timing characteristics during one tester cycle. Thus, these templates organize and simplify the user's decision making, since many decisions, that would otherwise have to be made again and again, may now be made only once and then incorporated again and again by reference to the appropriate template. The use of the templates also conserves total memory requirements. The template menu can provide visual feedback that includes timing diagrams and icons to assist the user in constructing the template.

Abstract: A differential amplifier includes an input stage and an output stage which are electrically isolated from each other to permit the input and output portions of the circuit to be operated at different voltage levels. A pair of optical couplers are employed to couple the differential signal from the input stage to the output stage. The output stage comprises a linear gain cell to provide an output signal proportional to the differential signal through the couplers divided by the common-mode signal through the couplers to stabilize gain and minimize D.C. offset drift caused by small changes in physical parameters or temperature.