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The Tektronix 661 is a [[sampling oscilloscope]] that was [[introduced in 1961]]. | The Tektronix 661 is a [[sampling oscilloscope]] that was [[introduced in 1961]]. | ||
It accepts two plug-ins: a sampling unit and a timing unit. | It accepts two plug-ins: a sampling unit and a timing unit. | ||
Four | |||
Four sampling units were made: | |||
* [[4S1]] (0.35 ns rise time) | * [[4S1]] (0.35 ns rise time) | ||
* [[4S2|4S2 and 4S2A]] (0.1 ns rise time) | * [[4S2|4S2 and 4S2A]] (0.1 ns rise time) | ||
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* [[5T3]] | * [[5T3]] | ||
== Inter-module Signals == | |||
The timing units use [[tunnel diodes|tunnel diode]] triggering. | The timing units use [[tunnel diodes|tunnel diode]] triggering. | ||
Two 50-ohm coaxial cables in the scope connect the sampling unit to the timing unit. | Two 50-ohm coaxial cables in the scope connect the sampling unit to the timing unit. | ||
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telling it when to sample. | telling it when to sample. | ||
== Triggering Modes == | |||
A 661 can be triggered in at least four distinct modes: | A 661 can be triggered in at least four distinct modes: | ||
* The 4S1 uses a trigger pickoff transformer to produce the internal trigger signal | * The 4S1 uses a trigger pickoff transformer to produce the internal trigger signal | ||
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* The calibration signal generator in the 661 can be used as trigger source, as described below. | * The calibration signal generator in the 661 can be used as trigger source, as described below. | ||
== Subsystems of the 661 == | |||
Other than the two plug-ins, the 661 mainframe essentially consists of four subsystems: | Other than the two plug-ins, the 661 mainframe essentially consists of four subsystems: | ||
* power supply | * power supply | ||
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* delayed pulse generator | * delayed pulse generator | ||
=== Power Supply === | |||
The power supply is typical of | The power supply is typical of | ||
Tektronix scopes of early 1960s. | Tektronix scopes of early 1960s. | ||
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use BJT-based regulators. The other regulators are tube-based. | use BJT-based regulators. The other regulators are tube-based. | ||
=== Indicator === | |||
The indicator is a conventional X-Y indicator. | The indicator is a conventional X-Y indicator. | ||
The total CRT accelerating voltage is 3kV and | The total CRT accelerating voltage is 3kV and | ||
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that determine their gain. | that determine their gain. | ||
=== Calibrator === | |||
The amplitude/time calibrator is a Colpitts oscillator that uses a [[7119]] | The amplitude/time calibrator is a Colpitts oscillator that uses a [[7119]] | ||
tube. It produces clippped sine waves at frequencies from 100kHz to 100MHz and | tube. It produces clippped sine waves at frequencies from 100kHz to 100MHz and | ||
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In many situations, this eliminates the need for external triggering. | In many situations, this eliminates the need for external triggering. | ||
=== Delayed Pulse Generator === | |||
The delayed pulse generator is a [[tunnel diodes|tunnel diode]] circuit | The delayed pulse generator is a [[tunnel diodes|tunnel diode]] circuit | ||
that produces a negative-going 250mV pulse with a risetime of about 150 ps | that produces a negative-going 250mV pulse with a risetime of about 150 ps | ||