560-series scopes: Difference between revisions

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560-series scopes (view source)

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The 560 series of mainframes includes the [[560]], [[506]], [[561]], [[564]], [[565]], [[567]], and [[568]].
The '''Tektronix 560 series''' of mainframes includes the [[560]], [[506]], [[561]], [[564]], [[565]], [[567]], and [[568]].
They were introduced with the [[560]] and [[561]] in 1961.
They were introduced with the [[560]] and [[561]] in 1961. The 560 series has plug-ins that drive the CRT deflection plates directly.
These seven oscilloscope mainframes have the following in common:
 
<gallery widths="150" heights="180">
Tek 506 331023143159.jpg        | '''[[506|506 − 20 MHz mainframe]]''' (1964)
Tek 560 1.jpeg        | '''[[560|560 − Basic mainframe]]''' (1961)
Tek 561s.jpg          | '''[[561]]''' (1961)
561a-2.jpg            | '''[[561A]]''' (1962)
Tek 561b 1.JPG        | '''[[561B|561B − Solid state scope]]''' (1969)
Tek rm561.jpg          | '''[[RM561|RM561 − Rack-mount 561]]'''
Tek564 front.jpg      | '''[[564|564 − Storage scope]]''' (1962−1968?)
564B_1_burndamage.jpg  | '''[[564B|564B − Solid state storage scope]]''' (1968)
R564B 1.JPG            | '''[[RM564|RM564 − Storage scope]]''' (1962−1968?)
Tek565-crop.jpg        | '''[[565|565 − Dual-beam scope]]''', two plug-ins; built-in trigger, sweep, and horizontal amplifier (1963)
567 front.jpg          | '''[[567|567 − Sampling scope with digital readout]]''' (1962)
568_1.JPG              | '''[[568|568 − Sampling scope]]''' (1967)
</gallery>
 
Early 560-series mainframes (e.g., the [[561]]) had tubes in the low voltage power supply and in the high voltage power supply.
Later scopes in the series (e.g., the [[561|561B]] and [[568]]) were all solid state except for the CRT.
 
==Common Features==
 
* They accept [[560-series plug-ins]] (the 567 additionally accepts the [[6R1]] or [[6R1A]] plug-ins)
* They accept [[560-series plug-ins]] (the 567 additionally accepts the [[6R1]] or [[6R1A]] plug-ins)
* 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 contain a vertical [[delay line]] (some plug-ins, e.g., the [[3A6]] have built-in delay lines so the rising edge of fast pulses with low repetition rate can be seen)
* They have linear power supplies (exception: the 560 power supply is basically a switch-mode power supply)
* 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 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 so the rising edge of fast pulses with low repetition rate can be seen)


==Plug-ins==
[[560-series plug-ins]] includes the 2-series models (e.g., the [[2A60]] and [[2B67]])
[[560-series plug-ins]] includes the 2-series models (e.g., the [[2A60]] and [[2B67]])
and the later, more power-hungry 3-series models (e.g., the [[3A1]] and [[3B3]]).
and the later 3-series models (e.g., the [[3A1]] and [[3B3]]) which consume more power than the  
The 3-series plug-ins consume more power than the power supply in the 560 and 561 can deliver,
power supply in the 560 and 561 can deliver (the 561A can meet the current demands of 3-series plug-ins).
The [[560]] and [[561]] are only for use with 2-series plug-ins;
3-series plug-ins consume more power than the 560 and 561 can supply.
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.


Having the vertical and horizontal deflection amplifiers in the plug-ins rather than in the mainframe has pros and cons.
'''Advantages of plug-ins driving the CRT directly'''


Pro:
* Lower cost for an entry-level configuration. No need for expensive high-speed amplifiers anywhere in the system.
* 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.  
* Bandwidth can be upgraded later by adding faster plug-ins.  
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* A small number of mainframe models can support a wide range of applications.
* A small number of mainframe models can support a wide range of applications.


Con:
'''Disadvantages of plug-ins driving the CRT directly'''
 
* Checking calibration after changing plug-ins is recommended.
* Checking calibration after changing plug-ins is recommended.
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. The 564B manual says:<blockquote>
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. The 564B manual says:<blockquote>
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</blockquote>
</blockquote>
* Since each plug-in contains deflection amplifiers, 560-series plug-ins cost more than a plug-in with equivalent functionality for a mainframe that has built-in deflection amplifiers. The purchase cost, weight, and maintenance burden of the extra deflection amplifiers adds up, particularly if the customer wants several different plug-ins at the high-speed end of the 560-series range.
* Since each plug-in contains deflection amplifiers, 560-series plug-ins cost more than a plug-in with equivalent functionality for a mainframe that has built-in deflection amplifiers. The purchase cost, weight, and maintenance burden of the extra deflection amplifiers adds up, particularly if the customer wants several different plug-ins at the high-speed end of the 560-series range.
Early 560-series mainframes (e.g., the [[561]]) had tubes in the low voltage power supply and in the high voltage power supply.
Later scopes in the series (e.g., the [[561|561B]] and [[568]]) were all solid state except for the CRT.
<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)
561a-2.jpg            | '''[[561A]]''' (1962)
Tek 561b 1.JPG        | '''[[561B|561B - Solid state scope]]''' (1969)
Tek rm561.jpg          | '''[[RM561]]'''
Tek564 front.jpg      | '''[[564|564 - Storage scope]]''' (1962-1968?)
564B_1_burndamage.jpg  | '''[[564B|564B - Storage solid state scope]]''' (1968)
R564B 1.JPG            | '''[[RM564|RM564 - Storage scope]]''' (1962-1968?)
Tek565-crop.jpg        | '''[[565|565 - Dual-beam scope]]''', two plug-ins; built-in trigger, sweep, and horizontal amplifier (1963)
567 front.jpg          | '''[[567|567 - Sampling scope with digital readout]]''' (1962)
568_1.JPG              | '''[[568|568 - Sampling scope]]''' (1967)
</gallery>




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