I have recently started to utilize the 4444, and are aiming for THD analysis of mains voltage and currents. I am a bit pussled about where to set the fundemental frequency e.g. 50Hz when utilizing the spectrum / FFT function, how does the software know how many orders to include in regards to THD, I find no settings relevant for this ?

Normally you would read out the % of the order level compared to the fundamental level, but I find no tool or settings to achive this ?

I have to compare the readings to standard EN61000-2-4.

Is there any PICO software where you can manage the above settings or will there be an update to version: 7.1.29.19560, where this harmonics can be handled in a easier way ?