Re: Update on 2465
That the 2465 has a quadrapole lens comes from a combinationtoggle quoted messageShow quoted text
of observation... I have a busted CRT... and reading about it
in one of the tek magazines.
When you look at your 485, do notice that the CRT's screen is
the same size as the 454A's, 36% smaller than the 2465.
That 36% is very significant in terms of spot size.
The 485, doesn't have any lens for increasing the deflection
sensitivity, so, that too helps the impression of size.
Another factor that makes the 2465 look fuzzy is all of the
switching that is going on to handle the display readout.
That switching causes a tiny, almost imperceptible tail on
the trace every time the beam flits away from the trace to
draw part of the readout. The trace looks better with the
Try comparing your 2465 at 20MHz BWL, with the 485 at 20MHz
BWL. Take a measurement of the beam diameter at the same
intensity, and compare it to the 2465. In my experience,
the 2465's is about a third larger.
Sigurður Ásgeirsson siggi@... [TekScopes] wrote: