Increase the length of size and recorder circular buffer

Hello again!

First of all:

I have a problem with the circular buffer.

I was able with a sampling frequency of 1000 Hz I used 6 circular buffers, each with a size of buffer for 30 minutes. It was no problem for the PC. I do not have such a high sampling rate, but I need a buffer size that is larger, something between 90 and 120 minutes with 8 pads. so I decided to reduce the sampling rate of what I need, it's 50 Hz. Because I reduced the sampling rate to 1/20 of the original sampling frequency I thought that a buffer size of 120 minutes should be possible.

Now, after trying the new sampling rate, I still can't use the 8 pads with more than 60 minutes. Any ideas why I had this problem? How can I provide a larger buffer, no possibility?

Second:

I use the recorder for display. I would like to display voltage in the long term. With the recorder the maximum length is approximately 3.5 hours. How can I view on longer periods? What I need to display the length in days. Is this possible? Perhaps with the other modules or almost?

That's it for now, thank you a lot for the useful tips.

Good day!

Good bye

The maximum time width of the graphic recorder or Y/t diagram is a function of memory (RAM) on the computer, the number of channels to display and the sampling frequency. Dynamically, the memory is allocated to the maximum. To avoid using RAM available on the computer, DASYLab is limited to half of the memory of the computer.

That being said... How you appear more time? You can reduce the number of samples using average or separate modules - in effect, reducing the sampling frequency. Alternatively, you can consider if the trigger on demand and a relay may be able to effectively reduce the samples for data to slow evolution.

Some clients have two screens high resolution on a shorter and more low resolution over a longer period.

Tags: NI Products

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