:02 PM
To: Ken Javor; Ralph McDiarmid; ieee pstc list
Subject: RE: Conducted Emissions PK/AVG
Your point is well taken Ken, and this certainly is interesting. My
approach to the concept of average does indeed run afoul of the
limitations of measurement devices and the potential for instrument
: Re: Conducted Emissions PK/AVG
Now this is getting interesting. If you arbitrarily reduce the VBW until
you see no time dependent amplitude variation, I think that leads to
non-repeatability. That is, if my spectrum analyzer has a 1 Hz VBW, and
yours has a 10 Hz VBW, we could get different
...@ix.netcom.com; Ralph McDiarmid; ieee pstc list
Subject: Re: Conducted Emissions PK/AVG
Now this is getting interesting. If you arbitrarily reduce the VBW until
you see no time dependent amplitude variation, I think that leads to
non-repeatability. That is, if my spectrum analyzer has a 1 Hz
...@ix.netcom.com
Reply-To: bdew...@ix.netcom.com
Date: Fri, 17 Dec 2004 18:39:11 -0800
To: Ralph McDiarmid ralph.mcdiar...@xantrex.com, ieee pstc list
emc-p...@ieee.org
Subject: RE: Conducted Emissions PK/AVG
Hi Ralph,
The HP 8568 and 8566 have a video averaging function, which averages
multiple
: 425-883-4757
cell: 425-417-8228
-Original Message-
From: owner-emc-p...@ieee.org [mailto:owner-emc-p...@ieee.org]On Behalf
Of Ralph McDiarmid
Sent: Friday, December 17, 2004 11:51 AM
To: ieee pstc list
Subject: RE: Conducted Emissions PK/AVG
I suggest there is an important
[mailto:owner-emc-p...@ieee.org] On Behalf
Of Cortland Richmond
Sent: December 16, 2004 1:04 PM
To: Alex McNeil; ieee pstc list
Subject: Re: Conducted Emissions PK/AVG
Alex McNeil asked:
Is the problem that the Test House may have used AVG BW 30KHz and
this
should have been AVG BW 9KHz the problem
Sure
Alex McNeil asked:
Is the problem that the Test House may have used AVG BW 30KHz and this
should have been AVG BW 9KHz the problem
Sure looks like it from what you posted. There've been discussions here --
it comes up every so often -- how to to do averaging on a SA. Without
knowing how they
scale set to LOG,
OOPS, that should have been LINEAR Sorry.
Bob Richards b...@toprudder.com wrote:
Alex,
It is very common that the emissions plots will be made with the RBW and VBW
that you mentioned. The actual QP and AV measurements should have the
instrument set with the
Alex,
It is very common that the emissions plots will be made with the RBW and VBW
that you mentioned. The actual QP and AV measurements should have the
instrument set with the appropriate detector and bandwidths. The RBW should
always be 9kHz, and for the average measurement the VBW should be
: Thursday, December 16, 2004 8:19 AM
To: emc-p...@ieee.org
Subject: Conducted Emissions PK/AVG
Hi Guys,
I had a product tested that failed the conducted emissions. The switch mode
power supply was the problem. It runs at approx. 200KHz. The failed readings
were in the 150KHz to 600KHz band
Are you sure it says AVG BW 30kHz, and not AVG BW 30 Hz? Is this a typo?
Also, quasi-peak should always be at or below the peak measurement. This is
why a peak measurement can be made (quickly) and compared to the quasi-peak
limit line, and if all the peaks are below the quasi-peak limit, the
Hi Guys,
I had a product tested that failed the conducted emissions. The switch mode
power supply was the problem. It runs at approx. 200KHz. The failed readings
were in the 150KHz to 600KHz band. The peaks were over the Avg and below the
QPk, so the Avg test was done. This resulted in the
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