Depending on what you are measuring, and mathematics, the channels can have 3 different ways of sampling:
1. Synchronous - These channels have a constant sample rate. If the sample rate is set to 100Hz, there will be a new sample every 1ms. (Analog in channels from Sirius, DEWE-43,..)
2. Asynchronous - The sample rate of these channels is not constant (CAN channels)
3. Single value - There is only one value through the whole measurment (this can be created with a single value option in basic statistics). There are also some other mathematics which output such a result for example sound level.
There are different options to check the sampling of the channel. Here are some of the options:
In the channel setup:
With more button add the Channels module. In the setup of each channel it is possible to find the sampling type.
Right click on the channel and go to properties. The sampling type can be found in the information tab.