Finding temperature stabilization in 3 minute time intervals

[Minnesota_Man]

I have an hour worth of data that I want to find when temperatures stabilize. My criteria is no more than 2degres rise in temperature over 3 minutes.  How can I break my entire run into 3 minute intervals and calculate temperature rise of each 3 minute intervals?

[altenbach]

• How many measurements do you take over 3 minutes? What is the accuracy?
• What should happen if the temperature actually decreases over the time interval (e.g. heater failure)?
• How much noise is in the data?
• etc.

We can help more if we have more information, of course. 😄

[Minnesota_Man]

I collected several different temperatures at a sample rate of 1hz(1 second).There is no noise in the data. The temperature does not decrease over time.

[Walter_Rick]

Hi Minnesota_Man,

You can calculate the delta values of the temperature channel first.

Then open the channel event function

Then set the parameters:

Channel: Delta

Event function: Window

Time channel: Time

Lower limit: 0

Upper limit: 0.1 (in your case 2 degres)

Use the filter function with an interval of 120 s (or 180 s for 3 minutes).

And calculate it.

The result is the channel EventStatus, which indicates with the first value grater 0 the beginning of the stabilization.

Greetings

Walter

[Minnesota_Man]

What does calculating differences do? Whats the background calculation?

[Walter_Rick]

The function “Differences” calculates the difference between two consecutive single values in a numeric channel. With that you calculate the change of the temperature from value to value. If this change is below a limit (in your case 2 degrees) for a certain time (in your case 180 s) then the signal is stable. The function “Event Search” checks with the parameter “Window” whether the signal is below the limit and with the parameter “Filter“ when the time interval of 3 minutes is reached.

Greetings

Walter

[Minnesota_Man]

something does not seem right still since the are shown shows stabilization. < 2F in a 180 second window

[Walter_Rick]

Can you please provide this dataset? Then I can have a look at it in detail.

Greetings

Walter