Hello All, Please help me improve the performance and efficiency of my code and UI. I have 2x USB 6002, 1000Hz Rate, Single sample waveform output, All Analog Channel Reading and some digital - Writing to a Single TDMS file. It took forever to get this to all work as it does and the code runs. The issue is during running, the program, all seems to work well until the Graphs start trailing behind by some milliseconds which increases in time to a full blown 4 seconds within 2 minutes of running. This effectively means that the data being read gets delayed in being displayed. Please note that everything is hardware to run the Dev1 and Dev2 USB 6002 device, and all analog channels reading and displaying. I used custom scales on MAX as well, which might cause the code not to run on your side. I tried implementing a state flow machine to allow users to configure data logging before running. There are 4 states - initialise, setup, run, and stop. See attached VI with its' subIV. Thank you.

Hi Kulan, @Kulani93 wrote: I have 2x USB 6002, 1000Hz Rate, Single sample waveform output, … Simplest solution: change to "N channels, N samples" mode for DAQmxRead and set the number of samples to read to (about) 100! You should NEVER use the "1 sample" mode for anything faster than 10 S/s… You already use the "1D array of waveforms" output mode for DAQmxRead (which is fine!), so your data handling doesn't change (a lot).

LabVIEW

2x USB 6002 all channel read, display, and write to TDMS Causing Front Panel Lag

Solved!

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@GerdW You SAVED my Life.

I set the NChan NSamp as you said and my Front panel and time stays in sync.

This has been running for over 10 minutes now and it all works so well. Thanks you.

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LabVIEW

2x USB 6002 all channel read, display, and write to TDMS Causing Front Panel Lag

Re: 2x USB 6002 all channel read, display, and write to TDMS Causing Front Panel Lag