560-series scopes: Difference between revisions

560-series scopes (view source)

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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.
-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)
--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">
 Tek 560 1.jpeg         | '''[[560|560 - Basic mainframe]]''' (1961)
+Tek 506 331023143159.jpg         | '''[[506|506 - 20 MHz mainframe]]''' (?)
 Tek 561s.jpg           | '''[[561]]''' (1961)
 a-2.jpg             | '''[[561A]]''' (1962)