When changing the timebase in the PicoScope 6 software, you may wonder why the sampling rate shown in the Properties view also changes. This application note aims to demonstrate why.
A PicoScope 5444D was used to create the screenshots below, with the signal generator output (5 Hz sine wave) connected to Channel A, but this note applies to all oscilloscope and data logger products supported by the software.
When the timebase is changed again to 50 ms/div, we are still requesting 1 MS from the device but the collection time is now 500 ms. The software finds the smallest possible sample interval and collects a number of samples based on that sample interval and the collection time selected.
To summarize, the sample rate is set according to the collection time and the maximum number of samples that the device can collect, based on the number of samples requested.