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560-series scopes: Difference between revisions
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These scopes use [[2-series or 3-series vertical plug-ins]] and [[2-series or 3-series horizontal plug-ins]]. | These scopes use [[2-series or 3-series vertical plug-ins]] and [[2-series or 3-series horizontal plug-ins]]. | ||
560-series mainframes contain no amplifier stages, | |||
requiring the plug-ins to directly drive the CRT deflection plates. | |||
While promoted by Tek as having the advantage of | |||
“not limited by additional circuitry between the plug-in and the deflection plates”, | |||
this configuration has a significant disadvantage. | |||
Touching up the gain or sweep cal when swapping plug-ins | |||
in scopes with amplifiers in the mainframe can be skipped, | |||
as doing so only tunes the accuracy to a small amount of additional precision. | |||
But in the 560 series, this step is required to even get crude accuracy, | |||
as the raw deflection factor of the CRT has a relatively large range, | |||
and the mainframe has no circuitry to normalize it. | |||
To maintain good phase match over a wide range of frequency, | |||
the mainframe does not contain a [[delay line]] in the vertical path. | |||
The faster vertical plug-ins contain the delay line, | |||
which limits the available volume for amplifier circuitry. | |||