Thank you so much Harvey,
unfortunately I don't know the Arduino, I only have experience with the PIC (eg 16F628A).
But in my research on the net I fortunately found a utility for PC which, through the Prologic interface (HP-IB to USB converter), allows to transmit the commands for the execution of the tests to the HP8903B and to receive the results with also the plotting of the graph.
I only verified that the utility works on a PC and that it dialogues with the Prologic converter, as the HP8903B audio analyzer has not yet arrived.
As soon as it arrives I try to check if everything works and if I can view the data and the graph from the HP8903B on the PC.
-- Cheers
??? Attilio
?
Attilio