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560-series scopes: Difference between revisions
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The 560 series | 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. | |||
560 | |||
<gallery widths="150" heights="180"> | <gallery widths="150" heights="180"> | ||
Tek 560 1.jpeg | '''[[560|560 | Tek 506 331023143159.jpg | '''[[506|506 − 20 MHz mainframe]]''' (1964) | ||
Tek 560 1.jpeg | '''[[560|560 − Basic mainframe]]''' (1961) | |||
Tek 561s.jpg | '''[[561]]''' (1961) | Tek 561s.jpg | '''[[561]]''' (1961) | ||
Tek rm561.jpg | '''[[RM561|RM561 − Rack-mount 561]]''' | |||
561a-2.jpg | '''[[561A]]''' (1962) | 561a-2.jpg | '''[[561A]]''' (1962) | ||
Tek_561b_cal_trace.jpg | '''[[561B|561B − Solid state scope]]''' (1969) | |||
Tek564 front.jpg | '''[[564|564 − Storage scope]]''' (1962−1968?) | |||
Tek564 front.jpg | '''[[564|564 | R564B 1.JPG | '''[[RM564|RM564 − Storage scope]]''' (1962−1968?) | ||
Tek564b-3a3-3b3.jpg | '''[[564B|564B − Solid state storage scope]]''' (1968) | |||
Tek565-crop.jpg | '''[[565|565 − Dual-beam scope]]''', two plug-ins; built-in trigger, sweep, and horizontal amplifier (1963) | |||
Tek565-crop.jpg | '''[[565|565 | 567 front.jpg | '''[[567|567 − Sampling scope with digital readout]]''' (1962) | ||
567 front.jpg | '''[[567|567 | 568_1.JPG | '''[[568|568 − Sampling scope]]''' (1967) | ||
568_1.JPG | '''[[568|568 | |||
</gallery> | </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]], the [[564|564B]], 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:<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. | |||