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VI Logs data - but keeps writing new data over the old - fix?

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V8.2.1 - Currently working on creating a control vi that will record current, voltage, temp data while a pump is on.  After a pump is on for a bit the float switch on the pump will turn the pump off.  The data only needs to be collected while the pump is running. I have it set up, I think, to only collect data when the current being drawn by the pump exceeds a set point control on the front panel.

 

Primarily - It will currently log data but I do not know why it is overwriting the data .  I need it to just log data while the pump is running..

 

Secondarily,   I also would like to figure out how to control the scan rate of collecting data better than just setting the ms timer


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