560-series scopes: Difference between revisions

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The 560 series scopes which were introduced with the [[560]] and [[561]] in 1961 were tube scopes that began to introduce some solid state circuitry.
The 560 series scopes which were introduced with the [[560]] and [[561]] in 1961 were tube scopes that began to introduce some solid state circuitry.
They use [[560-series plug-ins]] (exception: [[560]] and [[561]] only takes 2-series because of weak power supply).
The 560 series includes the [[560]], [[506]], [[561]], [[564]], [[565]], [[567]], and [[568]].
These seven oscilloscope mainframes have the following in common:
* They accept [[560-series plug-ins]] (the 567 additionally accepts the [[6R1]] or [[6R1A]] plug-ins)
* They have linear power supplies (exception: the 560 power supply is basically a switch-mode power supply)
* They require the plug-ins to drive the CRT vertical and horizontal deflection plates directly (exception: the 565, which includes built-in trigger, timebase, and horizontal amplifier circuitry)
* They don't use post-deflection acceleration of the CRT beam
* They were introduced between 1961 and 1967
* They don't contain a vertical [[delay line]] (some plug-ins, e.g., the [[3A6]] have built-in delay lines)


560-series mainframes contain neither delay lines nor amplifier stages, requiring the plug-ins to drive the CRT deflection plates directly,
The 560 series of plug-ins comprises the 2-series models (e.g., the [[2A60]] and [[2B67]],
at the disadvantage of needing to calibrate gain or sweep when swapping plug-ins.
and the 3-series models (e.g., the [[3A1]] and [[3B3]]).
The only exception is the 565, which includes built-in trigger, timebase, and horizontal amplifier circuitry.
The 3-series models are later and use more power than the 2-series models.
The 3-series plug-ins consume more power than the power supply in the 560 and 561 can deliver.
The [[560]] and [[561]] are only for use with 2-series plug-ins.
When the 561A replaced the original 561, one of the benefits it brought was a power supply capable of meeting the current demands
of 3-series plug-ins.


The 560 series included the [[560]], [[561]], [[564]], [[565]], [[567]], and [[568]].
Having the vertical and horizontal deflection amplifiers in the plug-ins rather than in the mainframe has pros and cons.
 
Pro:
* Lower cost for an entry-level configuration. No need for expensive high-speed amplifiers anywhere in the system.
* Bandwidth can be upgraded later by adding faster plug-ins.
* Replacing plug-ins has a high likelihood of fixing problems, unless there is a problem in the power supply or CRT.
 
Con:
* The signal path of the plug-in to mainframe interface is not as well standardized as it is on [[500-series scopes]] or [[7000-series scopes]]. This is primarily due to variability in deflection sensitivity of CRTs. Checking calibration after changing plug-ins is a recommended.
* Since each plug-in contains deflection amplifiers, the plug-ins cost more than a plug-in with equivalent functionality for a mainframe that has built-in deflection amplifiers. The cost of the deflection amplifiers adds up if the customer wants several different plug-ins at the high-speed end of the 560-series range.


<gallery widths="150" heights="180">
<gallery widths="150" heights="180">
Tek 560 1.jpeg        | '''[[560|560 - Basic mainframe]]''' (1961)
Tek 560 1.jpeg        | '''[[560|560 - Basic mainframe]]''' (1961)
Tek 506 331023143159.jpg        | '''[[506|506 - 20 MHz mainframe]]''' (?)
Tek 561s.jpg          | '''[[561]]''' (1961)
Tek 561s.jpg          | '''[[561]]''' (1961)
561a-2.jpg            | '''[[561A]]''' (1962)
561a-2.jpg            | '''[[561A]]''' (1962)

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