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From: email@example.com (Frank Miles)
Subject: Re: Oscilloscope modification
Date: 19 Nov 2002 18:18:28 GMT
Organization: University of Washington, Seattle
In article ,
>I have an old Solartron CD1400 oscilloscope. This is a valve device,
>with plug-in X- and Y-units. The X-unit (CX1443) is a timebase
>generator and has an X-input as well. The unit works fine, but the
>x-input is of little use since it is capacitor coupled and not much
>gain is available.
>I have very limited knowledge of crt's, but my idea is to use one of
>the two Y-units (CX1441) as an X-amplifier. The output stages of the
>plug-ins are directly connected to the deflection plates. Would it be
>possible to simply connect the (differential) output of a Y-amplifier
>to the X-plates?
>Any comments would be appreciated.
>At this site there are schematics for the oscilloscope:
Without going through the schematics in any depth (lack of time),
it's probably not going to work. 2 reasons: first, the sensitivity
of the horizontal deflection plates is typically substantially
poorer than for the vertical. Second, the mean bias voltage for the
horizontal deflection plates is generally not the same as for the
vertical. Some degradation in spot size (at best) or trace geometry
(at worst) may occur.
On the other hand, you won't hurt the CRT . Worst event is you
misconnect something and damage a power supply or your amplifier.
If the TB and amplifiers run on the same supply, and the interconnect
for the plugins is compatible, this risk disappears.
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