I have found an issue wih the PSA when using the preselector in ‘filter’ mode.
If the PS is in filter mode and a start frequency of 30MHz or stop frequency of 1GHz is commanded (even from the front panel) the result will be a ‘compressed’ 10Hz span at either 29.999MHz or 999.999MHz.
Example:
CF: 500MHz
Span: 1MHz
Change to:
Start Freq: 30MHz
Result:
29.999MHz to 30MHz.
NOTE: This does not happen if the preselector is in BYPASS.
This will be evident when you are using a ’scan’ type of action such as Optimize.
Work around:
Place two GPIB actions in the flowchart before the scan action.
In the first one: PSA:"sense:freq:star 30MHz"
In the second one: PSA:"sense:freq:stop 1GHz"
If I put them in the same one there was not enough time to set it.
I have contacted Agilent about this and will post here when I see the fix.
Joe Tannehill