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561: Difference between revisions
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The 561 is a member of the 560 series which use plug-ins for both the vertical and horizontal deflection. The 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. | The 561 is a member of the 560 series which use plug-ins for both the vertical and horizontal deflection. The 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. | 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. | |||
Over its life, the 561 was actually a series of four very different scopes, plus the rack mount versions of each. | Over its life, the 561 was actually a series of four very different scopes, plus the rack mount versions of each. | ||