Michael Dunn <mdunn@...>
At 3:13 AM -0700 2000/9/08, Stan Griffiths wrote:
> BTW, can anyone pointThough frequencies are usually low in such work. Were contemporary chopped scopes all too noisy?
The other dual beam scopes like the 551, 555, and 556 found uses in theWouldn't one need storage to capitalize on their dual-beamedness?
Stan or Patricia Griffiths <w7ni@...>
Michael Dunn wrote:
BTW, can anyone pointScopes like the 502 and later 502A (and still later 5030) were used a lot in
biomedical research. They were cheaper than storage scopes and had enough
sensitivity to directly observe a lot of the signals generated by animal
muscle movements and brain activity. In order to correlate two different
signals in the body (for example, brain activity and subsequent muscle
movement) you needed to monitor two points simaltaneously without the lost
of signal or noise that might be generated by sharing one beam using the
The other dual beam scopes like the 551, 555, and 556 found uses in the
nuclear energy industry. In these cases, the signals were much faster than
those found in the biomedical industry (like in a nuclear blast) and whole
events were missed if the "alternate" mode of a dual channel amplifier was
chosen. Even in the "chopped" mode whole events could be lost between
samples taken at the chopping rate. The answer was to use more scopes
simaltaneously, or in some cases, the use of dual beam scopes could save you
from having to have multiple scopes.