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GPIB Speed E4446A & E8257D

Question asked by desDRS on Jul 16, 2018
Latest reply on Jul 16, 2018 by Dr_joel

How fast can I control a E8257D Sig Gen and E4446A Spectrum Analyser using the NI GPIB-USB-HS+ interface card?

The sequence in LabVIEW  is

1) Set the Sig Gen freq,

2) Set the spectrum analyzer Cent Freq,

3) Mkr to Peak, 

4) read back marker amplitude and freq.

5) Repeat with next Freq.

The span time for E4446A is < 15msec/sweep; yet it takes > 0.8 second per freq. I was expecting as much as 10X faster since E4446A span time is < 15msec and the transfer rate for  NI GPIB-USB-HS+ is  > 1.8Mbytes/sec. What can I do to improve time?