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V4 EMC measurement issue for 30M-70Mhz band  

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alphay
(@alphay)
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23/01/2012 11:13 am  

Hi
Thanks for your time.
We try to measure EMC EN55022 from 30M to 1GHz,
But the band 30M-70MHz, we found the noise floor signal is up a bove limit line, and drop sharp ROUND 70 MHz.
Do you know why? and how to prevend it happened. Do you have the solution.
It is not reasonable signal in 30M-70MHz band.
Look forward to hearing from you soon.
Thanks

ALpha


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Moderator
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23/01/2012 3:42 pm  

Which hardware and settings do you use?

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alphay
(@alphay)
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24/01/2012 12:39 am  

Hi
The hardware is HF-60105 V4 X. It is USB type.
And the setting is for EN55022 class A limit line.
We follow your setting at the bottom of EN 55022 profile.
UVVB2 on, InterAmp on , sampleing time 500ms ..... all the same as your setting EN55022 profile.
I check the demo video on youtube for EN55022/55011 measurment.
The curve at 30-80MHz band is perfect. But from our MCS and 60105 V4 x , it is not same.
So, please clarify this issue,

Thanks

Alpha.
:D


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Moderator
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25/01/2012 1:07 pm  

Which antenna do you use?

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alphay
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28/01/2012 4:37 pm  

Hi
The near field probe is used...

Thanks

Alpha


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Moderator
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28/01/2012 5:04 pm  

You cannot use the EN limit line with a probe set. The EN limit is for FAR FIELD test only.

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alphay
(@alphay)
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Posts: 65
29/01/2012 4:34 am  

Hi
I know it.
But even without any antenna setting, how can I have the measurement data like you have in Youtube video?
Even we choose AARONIA 20300E antenna, the 30M-70MHz noise still be there, could you please check and figure out it ?

If for RF measurement, we scan 30M-200MHz, the noise 30-70MHz is there. Could you please let me know why?
How to avoid it happen by setting ?

Thanks

Alpha


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Moderator
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29/01/2012 9:40 am  

If you use the BicoLOG E antenna series or better our EMI antenna the noise is far below the limit line so it will be perfect for EN test.

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