E4440A

[NNA]

I want to communicate with Spectrum Analyzer E4440A thru GPIB-USB-HS but the driver Agilen ESA PSA series:configure marker search has an error " underdefined header" and the command for the function "Manual N dB Points (-3 dB)  - CALC:BWID:NDB- does not seem to work.

Can anyone help me with this issue?

Thanks

PS: labview 8.6.1

      latest NI-VISA version

[jjp377 · Accepted solution]

Are you still having issues with this VI?

[NNA]

Hi jjp37,

I'm still looking for help from someone. The problem is the driver MARKER SEARCH is not working functionally and the error is " underdefinded header"

Thanks

[Dennis_Knutson]

Have you turned on NI-Spy and gotten a trace of the commands being sent? You can use that data and compare to what the manual says.

[NNA]

Hi Dennis,

I did turn on the NI-SPY and got :  " VISA Read ("GPIB0::18::INSTR", 256, "-113,"Undefined header".")

I dont know how to get thru this problem

Thanks

NNA

[Dennis_Knutson]

You need to look at the NI-Spy log to see what is written to the instrument prior to the ERR? write/read that returns this code from the instrument. An undefined header indicates that it received some message that it could not parse correctly.

[NNA]

1.  VISA Get Attribute ("GPIB0::18::INSTR", USER_DATA, 179153943593484288)

2.  VISA Write ("GPIB0::18::INSTR", "CALC:BWID:NDB -3;")
3.  VISA Write ("GPIB0::18::INSTR", ":SYST:ERR?")
4.  VISA Read ("GPIB0::18::INSTR", 256, "-113,"Undefined header".")

These lines were captured by NI-Spy. The cmd :CALC:BWID:NDB" is not the right one. Can you show me how to program N dB point on E4440a ? I want to measure the 3dB bandwidth at the signal out in my project.

Thanks

[Dennis_Knutson]

I can't help right now. I'm not using the instrument right now and don't have the manuals.

I would presume that you do have the manuals. Have you looked for the correct command?

[NNA]

Thanks Dennis!

I looked for that command in E4440a programming manual but I can not find it. I dont know where they got it : CALC:BWID:NDB.

http://cp.literature.agilent.com/litweb/pdf/E4440-90139.pdf

[Dennis_Knutson]

I don't think that's the correct manual. See this.