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 '''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. The 560 series has plug-ins that drive the CRT deflection plates directly.


They use [[2-series or 3-series vertical plug-ins]] and [[2-series or 3-series horizontal plug-ins]] (exception: [[560]] only takes 2-series because of weak power supply).
<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_cal_trace.jpg | '''[[561B|561B − Solid state scope]]''' (1969)
Tek rm561.jpg          | '''[[RM561|RM561 − Rack-mount 561]]'''
Tek564 front.jpg      | '''[[564|564 − Storage scope]]''' (1962−1968?)
Tek564b-3a3-3b3.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==


560-series mainframes contain no amplifier stages, requiring the plug-ins to drive  
* They accept [[560-series plug-ins]] (the 567 additionally accepts the [[6R1]] or [[6R1A]] plug-ins)
the CRT deflection plates directly.  While promoted by Tek as having the advantage of
* The [[560 Series plug-in interface]] is designed so that the plug-ins drive the CRT vertical and horizontal deflection plates directly (exception: the 565, which includes built-in trigger, timebase, and horizontal amplifier circuitry)
“not limited by additional circuitry between the plug-in and the deflection plates”,
* 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)
this configuration has a significant disadvantage in that when swapping plug-ins,
* They have linear power supplies (exception: the 560 power supply is basically a switch-mode power supply)
gain or sweep have to be calibrated.
* They don't use post-deflection acceleration of the CRT beam


In scopes with amplifiers in the mainframe, touching up the gain or sweep cal when
==Plug-ins==
swapping plug-ins can be skipped, as doing so only tunes the accuracy to a small
[[560-series plug-ins]] includes the 2-series models (e.g., the [[2A60]] and [[2B67]])
amount of additional precision.  In the 560 series however, this step is required
and the later 3-series models (e.g., the [[3A1]] and [[3B3]]) which consume more power than the  
to even get crude accuracy, as the raw deflection factor of the CRT has a relatively
power supply in the 560 and 561 can deliver (the 561A can meet the current demands of 3-series plug-ins).
large range, and the mainframe has no circuitry to normalize it.


To maintain good phase match over a wide range of frequency,
'''Advantages of plug-ins driving the CRT directly'''
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.


==560 series scopes==
* Lower cost for an entry-level configuration. No need for expensive high-speed amplifiers anywhere in the system.
<gallery>
* Bandwidth can be upgraded later by adding faster plug-ins.
Image:Tek 560 1.jpeg    | [[560|560 - Basic mainframe]]
* Replacing plug-ins has a high likelihood of fixing problems, unless there is a problem in the power supply or CRT.
Image:Tek 561s.jpg      | [[561|561]]
* A small number of mainframe models can support a wide range of applications.
Image:Tek 564b 1.JPG    | [[564|564 - Storage scope]]
 
Image:Image needed.jpg   | [[565|565 - dual-beam scope, two plug-ins; built-in trigger, sweep, and horizontal amplifier]]
'''Disadvantages of plug-ins driving the CRT directly'''
Image:567 front.jpg      | [[567|567 - Sampling scope with digital readout]]
 
Image:Image needed.jpg  | [[568|568 - Sampling scope]]
* Checking calibration after changing plug-ins is recommended.
</gallery>
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 accuracy of measurements made with the Type 564B depends on the calibration of the plug-in units used.
  Since the plug-in units drive the deflection plated directly, each unit must be adjusted to match the deflection sensitivity of the particular CRT it drives.
  Therefore, the gain or sweep timing adjustment must be checked each time a plug-in unit is changed.  
   On most units, gain or timing calibration is made with a front-panel screwdriver adjustment.
</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.


==560 series plugins==
<gallery>
Image:Tek 3a1s.jpg        | [[3A1S]] - 25 MHz vertical amplifier
Image:Tek 3a7 1.JPG      | [[3A7]] - differential amplifier
Image:Tek-3a74-front.jpg  | [[3A74]] - four-channel vertical plug-in
Image:3a9 front.jpg      | [[3A9]] - 1 MHz differential amplifier
Image:Tek 3b1s.jpg        | [[3B1S]] - timebase plug-in
Image:Tek 3l5 front.jpg  | [[3L5]] - 1 MHz spectrum analyzer
Image:3s1 front.jpg      | [[3S1]] - dual-trace sampling plug-in
Image:3s3 front.jpg      | [[3S3]] - sampling plug-in
Image:3s7 front.JPG      | [[3S7]] - sampling plug-in
Image:Tek 3s76 front.jpg  | [[3S76]] - dual-trace sampling plug-in
Image:3t7 front.JPG      | [[3T7]] - sampling timebase and pulser
</gallery>




[[Category:560 series scopes]]
[[Category:Visual index pages]]
[[Category:Introduced in 1961]]

Revision as of 04:56, 7 August 2020

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. The 560 series has plug-ins that drive the CRT deflection plates directly.

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 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)
  • The 560 Series plug-in interface is designed so that the plug-ins 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 don't use post-deflection acceleration of the CRT beam

Plug-ins

560-series plug-ins includes the 2-series models (e.g., the 2A60 and 2B67) and the later 3-series models (e.g., the 3A1 and 3B3) which consume more power than the power supply in the 560 and 561 can deliver (the 561A can meet the current demands of 3-series plug-ins).

Advantages of plug-ins driving the CRT directly

  • 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.
  • A small number of mainframe models can support a wide range of applications.

Disadvantages of plug-ins driving the CRT directly

  • 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:

The accuracy of measurements made with the Type 564B depends on the calibration of the plug-in units used. Since the plug-in units drive the deflection plated directly, each unit must be adjusted to match the deflection sensitivity of the particular CRT it drives. Therefore, the gain or sweep timing adjustment must be checked each time a plug-in unit is changed. On most units, gain or timing calibration is made with a front-panel screwdriver adjustment.

  • 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.
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