Re: 2235 with 360 kHz 100mV P-P ringing on +100V PSU rail
tom jobe <tomjobe@...>
Hi Goran,toggle quoted messageShow quoted text
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
----- Original Message -----
From: "Gï¿½ran Krusell" <email@example.com>
Sent: Monday, May 23, 2011 3:43 PM
Subject: Re: [TekScopes] Re: 2235 with 360 kHz 100mV P-P ringing on +100V
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...?