Hi,
I'm making a computer program to measuse power of frecuencies with HP8590L and Matlab. I can modify some parameters of the analyzer like the resolution bandwith. I know this parameter change the filter of the signal in the analyzer and if you make it smaller then the time of the adquisition data will be increased. In non-zero span this increment of time exists but it's small but when I change to zero-span increment makes bigger, about 1 second between 300 Hz and 300 kHz. So, i think I've missed some of the meaning of the resolution bandwith when span is set to zero. Could someone help me to understand it?
Thank you,
Juanxu.
I'm making a computer program to measuse power of frecuencies with HP8590L and Matlab. I can modify some parameters of the analyzer like the resolution bandwith. I know this parameter change the filter of the signal in the analyzer and if you make it smaller then the time of the adquisition data will be increased. In non-zero span this increment of time exists but it's small but when I change to zero-span increment makes bigger, about 1 second between 300 Hz and 300 kHz. So, i think I've missed some of the meaning of the resolution bandwith when span is set to zero. Could someone help me to understand it?
Thank you,
Juanxu.
When in zero span and the resolution bandwidth is changed, the sweep time on the instrument should not change. What may change is the actual processing time as you narrow the resolution bandwidth filter. In other words the sweep itself will take the same amount of time, but the time in between sweeps will increase as the RBW is decreased or narrowed.
The 8590L did not have digital resolution bandwidths, so even when the RBW is set to 300 Hz or 300 kHz, the signal still goes through an analog filter.
Regards -