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N9000A CXA Signal Analyzer for EMC conducted measurement

Question asked by thomas9003 on Jul 9, 2012
Latest reply on Jul 10, 2012 by MikeM

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Hi,

I'm using N9000A CXA signal analyzer to do conducted testing on my DUT ( LED lighting ) for CISPR 15 from 9kHz to 150kHz.

Is there a connected test software I can install in N9000A CXA for 1 button measurement? like the trace file attached?

I'm using EMCO model 3825/2 LISN now, do you have the amplitude correction data for this model?

The measurement is in linear mode now, I was thinking to do a firmware update to A.10.52 (latest version)

Will it change to log mode after the update?

Please refer to the attached screen shots CXA and R&S spectrum analyzer measured. There are some differences in the reading.

Hope you can help.

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CISPR22 CONDUCTED_13SEPT2010.trace362.5 KB
different measurement CXA and R&S.docx113.5 KB

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emcpete Jul 9, 2012 2:17 PM

There are several things you should consider when making these measurements. It will be difficult to perform a one button operation.

CISPR 15 has two limits for each detector type, average and quasi-peak. The screen shots that you have shown are of swept measurements. The detector types are average and peak. The Agilent SA shows a span of 150 kHz to 30 MHz with a resolution bandwidth of 120 kHz. The CISPR bandwidth should be 9 kHz not 120 kHz. For the 9-150 kHz range, the bandwidth should be 200 Hz.

For the R&S screen shot, 9 kHz to 30 MHz, a CISPR bandwidth of 9 kHz was used. This is only correct for > 150 kHz. Also, the peak trace data shown is just that peak. In order to compare it to the limit, quasi-peak measurements should be performed. If the peak data is less than the quasi-peak limit, one can assume compliance.

The method for measuring the Voltage Division Factor for the LISN/AMN is detailed in CISPR 16-1-2

I see that you are also on the VEE forum. Your best bet is to write software to do this for you.

Edited by: emcpete on Jul 9, 2012 3:16 PM

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xingsali Jul 9, 2012 8:02 PM

As emcpete explained above, the settings on the CXA and RS's instrumnt are different(RBW and start freq), so the measurement result is different.

there is a measuement application of CXA - W6141A has help to perform the one button EMC conducted measurement.

The information about this option is at this linkage:
http://www.home.agilent.com/agilent/product.jspx?cc=US&lc=eng&nid=-35195.959181&pageMode=OV

You can refer to the meaurement guide of this option.
http://cp.literature.agilent.com/litweb/pdf/N6141-90002.pdf

You can find how to perform a conductive measuremt, and it includs the process of connecting the system, loading average and quasi-peak and average limit, loading correction file, performing measurement.

Refer to EMCO model 3825/2 LISN, I don't have a exsit correction file for it. I think you can create a correction file according to this LISN's datasheet.

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thomas9003 @ xingsali on Jul 10, 2012 7:09 AM

Hi,

Thanks for the info.

Btw do you have a template of the correction data in .csv?

I'm getting the LISN correction data in hard copy from supplier.

I need to key in manually into excel sheet, then input the file into the CXA.

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MikeM

@ thomas9003 on Aug 21, 2014 6:44 PM

Once you have the correction data for your LISN the easiest way to enter this is to do so with the onscreen limit editor. It's very easy to use. Go to Meas Setup, Limits, Edit.

Or, if you have software version A.10.00 or newer go to the *My Documents/EMC Limits and Ampcor/Ampcor* folder and start by transfering the *LISN, 10A.csv* sample file to your PC and edit it for your LISN.

Best regards,
Mike

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emcpete Jul 9, 2012 2:17 PM
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Correct Answer
There are several things you should consider when making these measurements. It will be difficult to perform a one button operation.

CISPR 15 has two limits for each detector type, average and quasi-peak. The screen shots that you have shown are of swept measurements. The detector types are average and peak. The Agilent SA shows a span of 150 kHz to 30 MHz with a resolution bandwidth of 120 kHz. The CISPR bandwidth should be 9 kHz not 120 kHz. For the 9-150 kHz range, the bandwidth should be 200 Hz.

For the R&S screen shot, 9 kHz to 30 MHz, a CISPR bandwidth of 9 kHz was used. This is only correct for > 150 kHz. Also, the peak trace data shown is just that peak. In order to compare it to the limit, quasi-peak measurements should be performed. If the peak data is less than the quasi-peak limit, one can assume compliance.

The method for measuring the Voltage Division Factor for the LISN/AMN is detailed in CISPR 16-1-2

I see that you are also on the VEE forum. Your best bet is to write software to do this for you.

Edited by: emcpete on Jul 9, 2012 3:16 PM
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xingsali Jul 9, 2012 8:02 PM
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Correct Answer
As emcpete explained above, the settings on the CXA and RS's instrumnt are different(RBW and start freq), so the measurement result is different.

there is a measuement application of CXA - W6141A has help to perform the one button EMC conducted measurement.

The information about this option is at this linkage:
http://www.home.agilent.com/agilent/product.jspx?cc=US&lc=eng&nid=-35195.959181&pageMode=OV

You can refer to the meaurement guide of this option.
http://cp.literature.agilent.com/litweb/pdf/N6141-90002.pdf

You can find how to perform a conductive measuremt, and it includs the process of connecting the system, loading average and quasi-peak and average limit, loading correction file, performing measurement.

Refer to EMCO model 3825/2 LISN, I don't have a exsit correction file for it. I think you can create a correction file according to this LISN's datasheet.
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- thomas9003 @ xingsali on Jul 10, 2012 7:09 AM
  Mark Correct
  Correct Answer
  Hi,
  
  Thanks for the info.
  
  Btw do you have a template of the correction data in .csv?
  
  I'm getting the LISN correction data in hard copy from supplier.
  
  I need to key in manually into excel sheet, then input the file into the CXA.
  Like • Show 0 Likes0
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  - MikeM @ thomas9003 on Aug 21, 2014 6:44 PM
    Mark Correct
    Correct Answer
    Once you have the correction data for your LISN the easiest way to enter this is to do so with the onscreen limit editor. It's very easy to use. Go to Meas Setup, Limits, Edit.
    
    Or, if you have software version A.10.00 or newer go to the *My Documents/EMC Limits and Ampcor/Ampcor* folder and start by transfering the *LISN, 10A.csv* sample file to your PC and edit it for your LISN.
    
    Best regards,
    Mike
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N9000A CXA Signal Analyzer for EMC conducted measurement

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