I'm recording pressures from a pressure transducer over time using a DAQ and Flexlogger. It's supposed to record about 500 samples per second.
The long history graph shows my transducer data really accurately, but when it comes to saving a CSV file for my test, there are lots of rows of data, sure, but the actual pressure reading isn't changing from one row to another. And when the pressure reading does eventually change, it's about 500+ rows down. The same transducers were used for another test and were read very accuraetely so I don't think its a sensor limitation. The shock waves I want to measure are over miliseconds, so the logger seems to miss the event. I've tried playing around with the counter and data rates but I'm not sure how to manipulate them so that I can log data 500 samples per second onwards.
There is also an issue reading the time in excel. Does anyone know how I could configure the CSV file or flexlogger software to plot my readings at a higher sample rate so that all readings are recorded per sample, and display them with a more suitable time stamp e.g miliseconds? Happy to discuss it further.
Make sure in FlexLogger, you specify the CSV file data rate at 500Hz on the "Logging Specification" tab:
If you view the TDMS file, does it have the expected data?
To display more accurate time info in Excel, right click on the time column and "Format Cells...". Under the Number tab, select Custom for the Type, and specify something like this for the "Type":
h:mm:ss.000 AM/PM (which will give you three decimal places after the second).
Hey, the date and time issue is fixed thanks. Below are some images of my data/counter/excel rates and then attached is the excel file for the recorded data. You can see in 1 second I only get 2 pressure readings (highlighted)