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Re: Ref Plot

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  • Sven Pfitt
    If you look at the second plot you see that the Hi line (Blue) and Low Line (Red) traces aren t always the same. Where they are the same they are Common Mode
    Message 1 of 9 , Nov 7, 2007
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      If you look at the second plot you see that the Hi line (Blue) and Low
      Line (Red) traces aren't always the same. Where they are the same they
      are Common Mode (symetrical) noise. Where they differ they are
      Differential Mode (Asymetrical) noise.

      The differential Mode noise is more easliy canceled out and will not be
      as likely to radiate when impressed on house wiring as the two wires in
      parallel will produce fields that tend to cancel.

      The Common Mode noise will not be canceled out by the parallel runs of
      wire in the house wiring because the noise mayt be present on both
      wires in phase, and will most likely radiate.

      Sven
    • jamesonbeam1
      ... If you use the New! Compose your message with Rich-Text Editor (Beta)
      Message 2 of 9 , Nov 7, 2007
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        --- In Distillers@yahoogroups.com, "Sven Pfitt" <thegimp98@...> wrote:
        >
        > I'm trying to figure out how to use HTML to link images into posts.
        >
        > I finally got time to go back to the noise room and do some testing
        > of a commercial lamp dimmer.
        >
        > That is the reference plot of a commercial triac dimmer I picked up
        > at WalMart. It is wired to 115 VAC and a 4.4 ampere load (but turned
        > off) through a Line ISolation Netowrk (LISN) and the measurements
        > taken with :
        >
        > Tektronix 2712 Spectrum Analyzer
        > Tektronix 2706 RF Prescaler
        > Electro Metrics LISN box (Line Impedance Stabilization Network)
        >
        > There is a second plot at:
        > <IMG SRC=" http://www.mirageport.com/gimp/4A_Conducted%
        > 20Emission.JPG">
        >
        > which shows the noise generated with the triac turned on at 50% power.
        >
        > The unit tested would have failed the CE certification (and
        > fortunatly does not have the CE mark). The unit was certified for USA
        > and Mexico only.
        >
        > The highest level shown on the plot (90dBuV) only corrosponds to a
        > level of around 0.032V of noise. Anything over about 0.010 V would be
        > a failure.
        >
        > As you can see in the second plot, TRIAC Switching noise is pretty
        > noticable all the way out to 2MHz.
        >

        If you use the  New! Compose your message with Rich-Text Editor (Beta).   when you reply, you can click on View HTML source - this will allow you to enter the actual HTML tags - like so:

         








        Jim.
      • Harry
        ... Read my tutorials on the website Donald Fransen & I set up for the purpose of teaching Rich Text & HTML Yahoo messaging. All are welcome.
        Message 3 of 9 , Nov 7, 2007
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          --- In Distillers@yahoogroups.com, "Sven Pfitt" <thegimp98@...> wrote:
          >
          > I'm trying to figure out how to use HTML to link images into posts.



          Read my tutorials on the website Donald Fransen & I set up for the
          purpose of teaching Rich Text & HTML Yahoo messaging. All are welcome.
          http://tech.groups.yahoo.com/group/experimenters_group/


          Slainte!
          regards Harry
        • Sherman
          I still don t comprehend. What would .032DBuv would affect? I am not specifying that the noise does or does not exist I am just saying it is not at a level to
          Message 4 of 9 , Nov 7, 2007
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            I still don't comprehend. What would .032DBuv would affect?
            I am not specifying that the noise does or does not exist I am just
            saying it is not at a level to affect anything in my life.
            why don't your put your PDA or maybe your lap top. Your are saying
            that something is.. but your are not making a case that something is
            important or has an impact.

            --- In Distillers@yahoogroups.com, "Harry" <gnikomson2000@...> wrote:
            >
            > --- In Distillers@yahoogroups.com, "Sven Pfitt" <thegimp98@> wrote:
            > >
            > > I'm trying to figure out how to use HTML to link images into
            posts.
            >
            >
            >
            > Read my tutorials on the website Donald Fransen & I set up for the
            > purpose of teaching Rich Text & HTML Yahoo messaging. All are
            welcome.
            > http://tech.groups.yahoo.com/group/experimenters_group/
            >
            >
            > Slainte!
            > regards Harry
            >
          • Sherman
            Ok sven you win. Happy? You are a tester and I am a builder and we will never agree. For some reason it is important to you. I don t care to say you are right.
            Message 5 of 9 , Nov 7, 2007
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              Ok sven you win. Happy? You are a tester and I am a builder and we
              will never agree. For some reason it is important to you. I don't care
              to say you are right. The triac makes rf. That is all I am willing to
              concede. RFI has not been proven at all. And you can't do it because
              the signal is way too low to affect anything.
              But YOU ARE RIGHT! The triac does make RF.
              Want to here it again?
              Hell what do I know? I have only built a dozen of these things that
              work really well for the purpose intended, which is to make some real
              good alcohol for a small amount of money without affecting anything
              around them.
              If you want, we can take this off line and out of the forum but out of
              respect for the others, I won't be discussing this with you or anyone
              else on here any more. If you want to chat outside this forum, cool.
              I will still be building, promoting economy and good recipes. If you
              are just looking for someone to bicker with I'll be glad to accomodate
              but on here.

              By the way half the parts cam in today for the kits. Progress is on
              schedule and on budget.

              --- In Distillers@yahoogroups.com, "Sherman" <pintoshine@...> wrote:
              >
              > I still don't comprehend. What would .032DBuv would affect?
              > I am not specifying that the noise does or does not exist I am just
              > saying it is not at a level to affect anything in my life.
              > why don't your put your PDA or maybe your lap top. Your are saying
              > that something is.. but your are not making a case that something is
              > important or has an impact.
              >
              > --- In Distillers@yahoogroups.com, "Harry" <gnikomson2000@> wrote:
              > >
              > > --- In Distillers@yahoogroups.com, "Sven Pfitt" <thegimp98@> wrote:
              > > >
              > > > I'm trying to figure out how to use HTML to link images into
              > posts.
              > >
              > >
              > >
              > > Read my tutorials on the website Donald Fransen & I set up for the
              > > purpose of teaching Rich Text & HTML Yahoo messaging. All are
              > welcome.
              > > http://tech.groups.yahoo.com/group/experimenters_group/
              > >
              > >
              > > Slainte!
              > > regards Harry
              > >
              >
            • Sven Pfitt
              Sherman, I m not trying to pick an argument with you and I m glad to see someone making kits to help others out. I m just tying to point out a weekness that
              Message 6 of 9 , Nov 8, 2007
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                Sherman,

                I'm not trying to 'pick an argument' with you and I'm glad to see
                someone making kits to help others out.

                I'm just tying to point out a weekness that is not visable unless (1)
                you get an installation that the problem exposes itself in, or (2)
                you look at it with an extremely critical eye (and sensitive tools).

                The extremely small numbers are simply the thresholds where it is
                possible to start inducing interference with other electronic items.
                Exceeding the thresholds does not guarantee you will have a problem,
                but staying below the threshold should guarantee you will not have a
                problem.

                I did try emailing you once but got no reply.

                I'll be glad to discuss it either in the other list or off line.

                Sven
                --- In Distillers@yahoogroups.com, "Sherman" <pintoshine@...> wrote:
                >
                > Ok sven you win. Happy? You are a tester and I am a builder and we
                > will never agree. For some reason it is important to you.

                ...snip...
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