Method and system for digital triggering of signals on the basis of two triggering events separated by a time difference
AssigneeRohde & Schwarz GmbH & Co. KG
InventorsMarkus Freidhof, Johann Huber
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Abstract
An approach is provided for digital triggering a recording of one or several signals sampled at individual sampling instants on a digital oscilloscope. The triggering is carried out when the interval between two recurrent triggering events is less or greater than a time threshold value.
Claims18
A method comprising:
- digitally triggering a recording of one or more signals sampled at individual sampling times on a digital oscilloscope,
- wherein the digital triggering is implemented if the time difference between two occurring triggering events, which is determined from the number of sampling times between the two triggering events, overshoots or undershoots a time threshold,
- wherein an overshooting of the time threshold by the time difference is unambiguously identified, if the number of sampling times determined overshoots a first upper threshold, and the overshooting of the time threshold by the time difference is unambiguously not identified, if the number of sampling times determined undershoots a first lower threshold,
- wherein the undershooting of the time threshold by the time difference is unambiguously identified, if the number of sampling times determined undershoots a second lower threshold, and the undershooting of the time threshold by the time difference is unambiguously not identified, if the number of sampling times determined overshoots a second upper threshold, and
- wherein in the case of neither an unambiguous identification of an overshooting or undershooting of the time threshold by the time difference nor an unambiguous non-identification of an overshooting or undershooting of the time threshold by the time difference, the individual sampled values of the signals to be recorded on the digital oscilloscope are buffered and subjected to a subsequent fine analysis to determine if the time difference between the two triggering events overshoots or undershoots the time threshold.
A system for digital triggering of a recording of one or more digitized signals on a digital oscilloscope, with a digital triggering in the case of an overshooting or undershooting of a time threshold by a time difference between a first and a second occurring triggering event, comprising at least one comparator for the comparison of at least one of the reference signals selected from the signals to be recorded on the digital oscilloscope with reference to overshooting or undershooting at least one threshold value, and a unit for the identification of triggering conditions disposed downstream of the comparator,
- wherein the number of sampling times between the first and second occurring triggering events is determined,
- wherein an overshooting of the time threshold by the time difference is unambiguously identified, if the number of sampling times determined overshoots a first upper threshold, and the overshooting of the time threshold by the time difference is unambiguously not identified, if the number of sampling times determined undershoots a first lower threshold,
- wherein the undershooting of the time threshold by the time difference is unambiguously identified, if the number of sampling times determined undershoots a second upper threshold, and the undershooting of the time threshold by the time difference is unambiguously not identified, if the number of sampling times determined overshoots a second upper threshold, and
- wherein in the absence of both an unambiguous identification of a triggering condition by the unit for identification of triggering conditions and of an unambiguous non-identification of a triggering condition by the unit for identification of triggering conditions, a final unambiguous identification or a final unambiguous non-identification of a triggering condition is realized by another unit for fine identification of triggering conditions.
Dependencies are inferred from the claim text.