tomfield wrote:Does this mean that earlier hardware versions of the 4223,4224, etc did not have the hardware frequency counter or have they always had the hardware but the software is just now catching up?
Sorry if this gets a bit complicated.
In the R6.6 beta release of the software there is an option to plot frequency vs time for all versions of PicoScope. This is available via the maths channels.
The PicoScope 4223/4224/4423/4424 also now have a hardware based frequency counter where you can dedicate a channel to frequency measurement. This hardware based frequency counter is within the FPGA and was also from the new software. There is no hardware change made for this - once the software is upgraded this new functionality is added.
For most applications the software based approach is best as you can record a waveform and plot the change in frequency of that waveform using a single channel. If you use the hardware based frequency counter you have to dedicate a channel to frequency measurement. The situation where the hardware based approach works best is where you want to plot for a long time (eg 1000 seconds) the frequency of a fast signal (eg 10MHz), this would not be possible with the software based approach as you would need to record the 10MHz signal for the whole 100 seconds (to record the 10MHz signal you might sample at say 50MHz for the 1000 seconds, that would require at least 50Gbytes of data).