Increasing circular buffer size and recorder length

[Hilby]

Hallo again!

First:

I have a problem with the circular buffer.

I was measuring with a sampling rate of 1000 Hz. I used 6 circular buffers, each with a buffer size of 30 minutes. That was no problem for the PC. I do not need such a high sampling rate, but i need a buffer size which is greater, something between 90 and 120 minutes with 8 buffers. so i decided to reduce the sampling rate to what I need, that is 50 Hz. Because i reduced the sampling rate to 1/20 of the original sampling rate i thought that a buffer size of 120 minutes should be possible.

Now, after trying the new sampling rate, i still cannot use the 8 buffers with more than 60 minutes. Any ideas why I have this problem? How can I provide a greater buffer size, any possibilities?

Second:

I use the recorder for display. I would like to display long term voltage variation. With the recorder the maximum length is about 3.5 hours. How can I display over longer terms? What I need are display length over days. Is that possible? Maybe with other modules or so?

Thats it for now, thanks a lot for helpful hints.

Have a nice day!

Goodbye

[Hilby]

Good morning!

I have solved my problem with the circular buffer size. I just had overwritten my settings in dasylab with the max task settings where I had a higher sample rate.

But I still have problems with my plott. The maxmum size is 3.76 hours.

Is it possible to extend this plot length?

Thanks and goodbye.

Hilby

[CJ_Butler__DASYLab_Pro · Accepted solution]

The maximum time width of the Chart Recorder or Y/t Chart is a function of available memory (RAM) on the computer, the number of channels to be displayed and the sample rate. Memory is allocated dynamically, up to the maximum. To prevent using all available RAM on the computer, DASYLab restricts itself to about half of the computer memory.

Having said that... how do you display more time? You can reduce the number of samples using the Average or Separate modules - in effect, reducing the sample rate. You can also consider whether the Trigger on Demand and a Relay might be able to effectively reduce samples for slowly changing data.

Some customers have two displays, high resolution over a shorter duration of time, and lower resolution over a longer duration.

[Hilby]

Hallo cj!

Thanks for the tipps!

Bye!