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vrf Example program for S param

Question asked by VRFuser on Sep 15, 2007
Hello,
  There may be some interactions that are causing this trouble.  One thing I notice is that the amplifier has quite high gain, and it may be overdriving the ENA.
 
It would be good if you told us more about the ENA settings you are using as well.
 
In the example program, there is a note in the SetUpNewTraces object that says:

First, send the command "SYST:PRES", which does a preset and deletes the default trace, but then you lose any settings like calibration, power, etc. We set the the data form to 32 bit real (the VNA doesn't have more resolution than that). This can be done anytime before you read data. Then we hold the analyzer, so we don't have to compete with data taking.

If you want the correction to stay on, and the power and attenuator settings to not change, you need to remove the preset command.  The preset power may be too high for your DUT.  Also, presetting will turn off COR which I'm sure you don't want either.  If your analyzer aready has traces setup, you can skip the "Set-Up-New-Traces" function, but you do need to cal:par:sel each trace before it is read, and you need to send the FORM:DATA REAL32 command sometime before you read data.

I think that each of the first 5 sections is nested only one deep, with lots of "notepads" added for details on each step.  From these notes, you should be able to figure out how to modify the example program to do what you need.

Joel

 


  _____  

From: M Asgar [mailto:masgar@rfarrays.com]
Sent: Friday, September 14, 2007 11:01 PM
To: VRF
Subject: RE: [vrf] Example program for S param


Hi Scott,
Pls find attached the image on the net analyser after I run the program when the DUT is in OFF state.Here also the cal correction is turned off.(by the program)
 
There seems to be a bug in the example program that it is unable to capture the "true" graphs when the DUT is turned ON.
 
Also I have seen keeping the IFBWs exactly same but still the results are different.
 
Thanks
Asgar
 
 
 

  _____  

From: scott_morrison@agilent.com [mailto:scott_morrison@agilent.com]
Sent: Friday, September 14, 2007 8:25 PM
To: masgar@rfarrays.com; vrf@agilent.com
Subject: RE: [vrf] Example program for S param



Hi Asgar,

            I note that the correction (cal) is apparently turned off in the screenshot ‘disp3’ where it was on in the previous two screenshots…is this the difference you’re seeing?  Similarly, the IFBWs are significantly different…..

-Scott

 


  _____  


From: M Asgar [mailto:masgar@rfarrays.com]
Sent: Friday, September 14, 2007 4:23 AM
To: VRF
Subject: [vrf] Example program for S param

 

Hello All,

I wanted to append to the below mail that when the DUT is connected to the analyser but switched off, I get the accurate data on the VEE program window as that of the analyser but when the DUT is switched ON through power supply then the data I see on the program window is not accurate and different from that of the data on the analyser.

 

disp1 is the image at DUT OFF(the image seen on the program window is same as that of analyser)

disp2 is the image on the analyser @ DUT ON

disp3 is the image on the program window @ DUT ON.(See the differences between the two images disp2 & disp3)

 

Thanks

Asgar

 

 


  _____  


From: M Asgar [mailto:masgar@rfarrays.com]
Sent: Thursday, September 13, 2007 1:43 PM
To: VRF
Subject: [vrf] Example program for S param

Dear All,

I was trying the example file  AgE50xxx_ENA1 from the examples directory of VEE (Veepro8.0/examples/InstrumentIO/InstrManagerIntegrated/AgE50xxx_ENA1.vee).

I could connect to my instrument(ENA5071B) on the LAN and get the data sweep from 500MhZ to 8GHz.But the data I see on the program window is the not the faithful representation of the S param graphs seen on the network analyzer.The data seen in the program window is down by some dB values.(I have chosen the format:dB in the program window)

 

Can anyone help please.

 

Best Regards

Asgar

RF Arrays

India

 


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