Re: 2235 with 360 kHz 100mV P-P ringing on +100V PSU rail
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tom jobe <tomjobe@...>
Hi Goran,
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You make some excellent points! This ripple trash getting into the CRT leads might all just cancel out, which would completely cancel out my latest thoughts to. The +100 volt supply is also connected closely to other CRT inputs such as the Geometry and the Grid Bias, and I do not think they have any common mode canceling. Hummm? tom jobe...
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From: "G�ran Krusell" <goran.krusell@ericsson.com> To: <TekScopes@yahoogroups.com> Sent: Monday, May 23, 2011 3:43 PM Subject: Re: [TekScopes] Re: 2235 with 360 kHz 100mV P-P ringing on +100V PSU rail Hello guys, I think Jerry is right. A 100mV ripple on +100V DC is not the problem in this case. In some cases the ripple enters as a common mode signal and this is never a problem. Of course, if you want to do the experiment and insert an LCL-filter you can do that. Such a filter calls for some calculations but first you need to measure the DC current. It is quite possible to build such a filter using some standard components. But my guess is that you will not see any difference at all. If you have a substantial rippel on a supply voltage (like 10%) then it would show up as a problem but this is not the case here. The problem is somewhere in the amplifier chain I believe... On the other hand, what tells you that this ripple has the same frequency as the ripple/noise that you see on the CRT...? G�ran
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