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Hello, I'm using the 9229 and borrowed a community example to log 4 voltage inputs to TDMS. I need to output RMS voltage on channels 1&2 and the wavform on channels 3&4. Essentially what I've done is averaged channels 3&4 using the same # of samples that the RMS is averaged, that way I'm able to make sure they are time synchronized (see code attached). Another advantage doing averaging the samples is that I am reducing the amount of data to analyze later. When i compare the TDMS read results to the # of samples in the TDMS file there seems to be a discrepancy in time. I tried to add a time stamp to the logged TDMS file but couldn't get it to work. besides using time stamps, Is there an easy way to confirm that I am saving all of the data I am capturing? Eventually i will be logging data at 30min-40min intervals so I want to make sure that i'm not losing data. TDMS_Logging_Simple_4chan.vi
I recently spent some time describing a logging tool that we use here at DMC that has significantly reduced our debug times and helped a lot with onsite support and I thought it was worth bringing it up to the LabVIEW community. Essentially, it's a logging utility based off of NLog that allows the user to add the equivalent of print statements to their code - any string that can be built is fair game. It also allows a logging level to be associated with the print statement and this is the concept that makes it extremely powerful. Some statements can be low-level "trace" statements, while others are "warnings" or "errors". During run-time (even in an executable) the level of the logger can be changed and you can easily do trace-level debugging for a glitch, and then set it back to an informational level afterwards. Multiple targets are supported, including RT console, log files, TCP/UDP streams, and email. All the calls are made asynchronously, so the debug statements have a minimal impact on the code execution. At this point we are finishing and polishing the implementation, but more information and details can be found in a blog post I recently wrote: NLog for LabVIEW: Logging done properly -Jody Koplo