Abstract: An oscilloscope probe includes: a connector pod; a probe identification module disposed in the connector pod, the probe identification module having a cross-sectional area; and a resistor disposed in the connector pod, and in-line with the probe identification module and having a substantially identical cross-sectional area as the probe identification module.

Abstract: An oscilloscope probe includes: a connector pod; a probe identification module disposed in the connector pod, the probe identification module having a cross-sectional area; and a resistor disposed in the connector pod, and in-line with the probe identification module and having a substantially identical cross-sectional area as the probe identification module.

Abstract: An oscilloscope probe includes: a connector pod; a probe identification module disposed in the connector pod, the probe identification module having a cross-sectional area; and a resistor disposed in the connector pod, and in-line with the probe identification module and having a substantially identical cross-sectional area as the probe identification module.

Abstract: A method and apparatus for collecting digital sample data from a target system accesses the digital sample data at transitions of a sample clock, acquires information related to an instantaneous average period of the sample clock, and records the digital sample data and the information related to the instantaneous average period of the sample clock.

Abstract: A sampling circuit that continuously compensates for drift. The sampling circuit includes a primary sampler surrounded by two proximity samplers. The proximity samplers are used to detect data transitions that encroach on the primary sampler. By comparing the output of the proximity samplers with the primary sampler a determination can be made as to whether data transitions are encroaching on the primary sampler. If such encroachments are detected, the delay timing of the sampling operation may be increased or shortened to compensate.

Abstract: An eye diagram analyzer assigns a plurality of SUT data signals to be members of a labeled group of channels. There may be a plurality of such groups. In addition to mere superposition in an (X, Y) display space of the various i-many (X, Y)-valued pixels for individual component eye diagrams associated with that group, other measured data for those pixels within a group can be merged in various different modes to produce corresponding composite eye diagram presentations. E.g., in a Normalized Signal Density Mode the number of hits at each trial measurement point is summed over all channels in the group, and then divided by the total number of clock cycles measured for the ith measurement point in that group to produce a density Di associated with the corresponding ith pixel: (Xi, Yi, Di). If Di is rendered as a color or an intensity, the resulting eye diagram includes a representation (the Di) of a normalized density of transitions at each point (Xi, Yi), relative to that group as a whole.

Abstract: Systems and methodologies for use in signal measurement systems that acquire and store signal data in accordance with a trigger specification. In particular, the present invention is directed to a hardware resource allocator that is interposed between the signal acquisition hardware of a logic analyzer and the user interface on which a signal measurement specification model is presented to the operator. The hardware resource allocator translates the measurement requirements as specified by the user on the user interface to commands for allocation and control of the appropriate combination of hardware resources. Generally, the hardware resource allocator allocates and configures the requisite hardware resources and translates the measurement specification to hardware control data used by software drivers to program the signal acquisition hardware resources.

Abstract: An eye diagram analyzer can assign a plurality of SUT data signals to be members of a labeled group of channels. There may be a plurality of such groups. The measured data for components within a group can be merged according to various different modes into a composite eye diagram presentation. When a composite eye diagram is being displayed, the operator may position a screen pointer (cursor) over some interesting part of the eye diagram, and the analyzer will display a list those channels that contributed to the displayed pixels in that part of the eye diagram, as well as other related information. The operator may also select a channel from among the group, and then have the displayed pixels for which it is responsible be displayed in a selected color or otherwise highlighted in a way that allows them to be distinguished from all others.

Abstract: An eye diagram analyzer can assign a plurality of SUT data signals to be members of a labeled group of channels. There may be a plurality of such groups. The measured data for components within a group can be merged according to various different modes into a composite eye diagram presentation. When a composite eye diagram is being displayed, the operator may position a screen pointer (cursor) over some interesting part of the eye diagram, and the analyzer will display a list those channels that contributed to the displayed pixels in that part of the eye diagram, as well as other related information. The operator may also select a channel from among the group, and then have the displayed pixels for which it is responsible be displayed in a selected color or otherwise highlighted in a way that allows them to be distinguished from all others.

Abstract: An eye diagram analyzer assigns a plurality of SUT data signals to be members of a labeled group of channels. There may be a plurality of such groups. In addition to mere superposition in an (X, Y) display space of the various i-many (X, Y)-valued pixels for individual component eye diagrams associated with that group, other measured data for those pixels within a group can be merged in various different modes to produce corresponding composite eye diagram presentations. E.g., in a Normalized Signal Density Mode the number of hits at each trial measurement point is summed over all channels in the group, and then divided by the total number of clock cycles measured for the ith measurement point in that group to produce a density Di associated with the corresponding ith pixel: (Xi, Yi, Di). If Di is rendered as a color or an intensity, the resulting eye diagram includes a representation (the Di) of a normalized density of transitions at each point (Xi, Yi), relative to that group as a whole.

Abstract: Systems and methodologies for use in signal measurement systems that acquire and store signal data in accordance with a trigger specification. In particular, the present invention is directed to a hardware resource allocator that is interposed between the signal acquisition hardware of a logic analyzer and the user interface on which a signal measurement specification model is presented to the operator. The hardware resource allocator translates the measurement requirements as specified by the user on the user interface to commands for allocation and control of the appropriate combination of hardware resources. Generally, the hardware resource allocator allocates and configures the requisite hardware resources and translates the measurement specification to hardware control data used by software drivers to program the signal acquisition hardware resources.

Abstract: An integrated trigger function display system and methodology for trigger definition development in a signal measurement system having a graphical user interface. The system contemporaneously displays one or more trigger function names and an associated trigger function descriptor describing a trigger function identified by the associated trigger function name. The trigger name is displayed in a trigger name display region of a display window that concurrently displays a plurality of trigger function names. The descriptor is displayed in a trigger descriptor region of the display window so as to be visually-associated by the operator. A trigger definition is comprised of one or more trigger functions. Each trigger function is a graphical representation of an one or more underlying trigger primitives. A trigger primitive is a computer program statement that is translated into a form suitable for controlling the signal measurement system.