Saving data at a slower rate than I want my VI to run at?

[lavid2002]

Good morning everyone.

I have a VI that scans hardware for data. I need this process to run at around 0.1 to 1KHz. I only want to store this data at a rate of 1Hz though.

I can't figure out how I can get my data into the .txt file at a rate of only 1Hz without slowing down my whole VI to 1Hz.

I have attached an example of what I'm trying to do. I am using random number generators in lieu of my data acquisition code to simplify things a bit.

Thanks!

[GerdW]

Hi lavid,

you could decimate your data to 1 Hz!

When you get data at 1kS/s you would get the mean of 1000 samples (or just pick one sample out of 1000) for saving…

[lavid2002]

Hi GerdW 🙂

I am saving my data in a string into a txt file. The decimator doesn't work on the date and time I want to be saved with each row of data unfortunately.

Hmmmm

[GerdW]

Hi lavid,

one note: you can decimate before converting to string…

[lavid2002]

Right, but then my data is decimated and my date and time string still saves at 1kHz and my .txt data file gets all discombobulated :I

[arteitle]

Obviously you decimate the date/time as well.

[lavid2002]

I thought I couldn't decimate a string...?

[arteitle]

Like GerdW said, you can decimate before converting to a string, or if you have an array of strings you can decimate that array.

[RTSLVU]

Hmm... Lets see you want high speed data acquisition and low speed data recording.

Isn't that by definition a Producer Consumer architecture?

[Bob_Schor]

I'm not certain I understand why you are having such difficulty with the idea of decimation.  Does this Snippet make sense to you?

Bob Schor