Due to various factors and internal buffer structure, maximum history size in a 3D graph is usually smaller than defined history size in FFT.

In the FFT analyser, we define the minimum wanted number of lines (Dewesoft will reserve enough memory for at least that many samples). For example if we set the number of samples to 100, it is possible to define at least 100 samples also in the 3D graph. 

The number which can be defined in 3D graph can be higher than the number defined in FFT analyser, if the async DB buffer length has engough memory. 

3D graph max 9999 lines

Measure 100% 

Analyse 80%