Hello: The link between the instrument and the PC is lan, and the instrument I want to control is spectrum analyzer, its type is E4440A. I download the driver from the web(see the attached file "Agilent ESA PSA Series.zip"), and control the spectrum analyzer to search the peak, the program I used is the example of the driver, the route of the example is "Agilent ESA PSA Series\Examples\Agilent ESA PSA Series Configure and Query Marker.vi", but the start frequency I only can set to zero or lower, when I set it above 0Hz, it occurs an error(see the attached picture "ERROR.JPG"). It appears that there is a bug in the driver where it is doing something like always setting the marker start frequency to 0Hz even if you set the trace start frequency to something higher. Please help me to solve the problem. Thank you very much!

Instrument Control (GPIB, Serial, VISA, IVI)

Isn't that what I told you all the way back in message 3?

Message 11 of 11

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