HAVE high sampling frequency of trigger

Dear community

I am using a microscope to tunnel effect from here feeding two voltage signals on my map of acquisition of data USB-6212 (Labview 2013 SP1). A voltage signal is the voltage applied to a piezo in the microscope (AI0). This signal drifting slowly over time and it is noisy. The other voltage signal is a tunnel current is converted into a voltage (AI2) signal (see attached photo):

Ideally, I would like to record the two signals between the lines dotted in a .txt file whenever the event of tip in the top image rises. This should be about every second during a day.

So far, I've written a VI that calculates the moving average of the piezo signal and if the piezo voltage exceeds a certain percentage of the average running it fires a command 'Save as file'. The VI works well for a frequency of 100 Hz, but when I go to 20 kHz, the trigger does not work properly. I am also only watching a lot of a number (in this case, 1000) and if there is a trigger signal in these samples of 1000. So if there's a signal around 0 or 1000 I cut and split into two files that I want to avoid.

I don't have much experience with Labview and probably broke every rule of design in the book.

My question is if there is a smarter way to automatically back up the signal between the same dotted lines at high frequencies of sampling?

I thank very you much in advance!

Hi Mario,.

I rewrote the portions of your VI to improve performance (we hope). No need to three queues.  No inquiry unless there is a trigger occurs.

I'm confused by the outbreak that seems to detect the edges of the piezo signal high side, even if the tip is in the negative sense.  I modified this logic (eventually) get a threshold top-side of the signal of tunneling.

It is unclear what might happen to 20 kHz.  The example shows a constant 1 kHz sampling rate and 1 K samples treated by loop.  If the sampling rate is changed to 20 kHz, then the loop will have to run to 20 Hz in order to keep up with the acquired data (@1 K samples per read).

I hope that the joint allows VI (not tested).

Tags: NI Software

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