When changing the timebase in the PicoScope 6 software, you may wonder why the sampling rate shown in the Properties view also changes. This post aims to demonstrate why.
A PicoScope 5244A was used to create the screenshots below, with the signal generator output (5 Hz sine wave) connected to Channel A, but this will apply to our other products that are supported by the software.
The figure below shows a waveform trace captured in streaming mode (timebase is set to 200ms/div i.e. 2 seconds across the screen) with 1 MS requested from the device.
Note the change in sample interval when the timebase is changed to 100ms/div (here the PicoScope switches to a block mode capture due to the PicoScope 6 settings). The collection time has changed (1 second across the screen) but the number of samples is FIXED.
When the timebase is changed again to 50ms/div, we are still requesting 1 MS from the device but note that the collection time is now 500 ms. The software finds the fastest possible sampling interval and will collect the number of samples based on the sampling interval and the collection time selected.
To summarise, the sample rate will be set according to the collection time and the maximum number of samples that the device can collect (based on the number of samples requested).
Last edited by Hitesh
on Mon Oct 03, 2016 11:36 am, edited 1 time in total.
Reason: Corrections to text