How to do envelope detection using ni 7954

Hi,
I want to impliment an envelope detector in ni7954.  Iam using 5751 adapter module with 7954. Can someone suggest me a good article to refer or a nice explanation on how to impliment the same.

Hi Bassem,
for delta detection in your data source there are three possibilities:
1. the source data has some identifier when it has been modified and deleted data is marked an not physically deleted
In this case you just filter the data that has been changed in your owb mappings.
2. you use some change data capture technologies
You have to install this manually when using owb 11.1 or older versions (google for oracle and cdc). owb 11R2 brings built in support for change data capture.
3. you get all the data and identify the delta manually
In the owb mapping you left outer join the data from your source with the existing data in your target and filter for the data that is new or has been modified. In a second step you identify the deleted data by selecting the data in your target minus the data from your source.
Which approach is the best depends on your specific system architecture.
Regards,
Carsten.

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    Senior Software Engineer :: Multifunction Instruments Applications Group
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    My latest community nugget on producer/consumer design
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