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The
Electronic Switch ID-22 came
on the market in 1964 and was produced until 1970. It was the successor
of the S-3 that
came on the market in
1956. There is only minor differences between the S-3 and the ID-22.
In 1971 the ID-22
was replaced
by the ID-101,
which in turn was replaced by the ID-4101
in 1977. The ID-22
makes the oscilloscope dual
channel. At the time most oscilloscopes was only
single channel so it came in handy. A disadvantage is that it reduces
the bandwith.
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