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The Tektronix Type 4S1 is a dual-trace [[sampling_oscilloscope|sampling]] unit for the [[661]]. | {{Plugin Sidebar| | ||
title=Tektronix 4S1| | |||
summary=Dual trace sampling unit| | |||
image=Image needed.jpg | | |||
caption=4S1 front view image needed | | |||
years=1962 – ? | | |||
type=Sampling Plugin| | |||
series=[[661]]| | |||
manuals= | |||
* [http://w140.com/kurt/4s1.pdf 4S1 manual without schematics] | |||
* [http://w140.com/kurt/4s1/ 4S1 schematics] | |||
* [http://w140.com/tek_4s1_late.pdf Late Issue Tektronix 4S1 Manual (PDF)] | |||
* [http://w140.com/tek_661_4s1_5t1_preliminary.pdf Tek 661 4S1 5T1 Preliminary Manual (PDF)] | |||
}} | |||
The '''Tektronix Type 4S1''' is a dual-trace [[sampling_oscilloscope|sampling]] unit for the [[661]]. | |||
The 4S1 was developed in 1961 and [[introduced in 1962]]. | The 4S1 was developed in 1961 and [[introduced in 1962]]. | ||
Each channel has a trigger pickoff, a [[delay line]], and a sampler. | |||
Specified rise time is | Each channel has a trigger pickoff, a [[delay line]], and a sampler. Specified rise time is 350 ps. | ||
The sampling pulses for each channel are generated by a step recovery diode. | The sampling pulses for each channel are generated by a step recovery diode. | ||
== Sampling Bridge == | ==Description== | ||
=== Sampling Bridge === | |||
The sampling pulses are fed to a sampling bridge made of four [[sampling diodes|GaAs diodes]]. | The sampling pulses are fed to a sampling bridge made of four [[sampling diodes|GaAs diodes]]. | ||
These diodes are fragile and exact replacements are hard to find. | These diodes are fragile and exact replacements are hard to find. | ||
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diodes such as those in HP/Agilent's HSMS-28x series. | diodes such as those in HP/Agilent's HSMS-28x series. | ||
== Dual-trace and X-Y Modes == | === Dual-trace and X-Y Modes === | ||
The 4S1 has a dual-trace mode, where the A waveform and the B waveform | The 4S1 has a dual-trace mode, where the A waveform and the B waveform | ||
are both displayed in the time domain at the same time with a single | are both displayed in the time domain at the same time with a single | ||
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through [[Connectors#GR-874|GR-874 connectors]] on the front panel. | through [[Connectors#GR-874|GR-874 connectors]] on the front panel. | ||
== Trigger Amplifier == | === Trigger Amplifier === | ||
The 4S1 uses an unusual trigger amplifier with two trigger signal paths. One path is for low frequencies, the other for high frequencies. | The 4S1 uses an unusual trigger amplifier with two trigger signal paths. One path is for low frequencies, the other for high frequencies. | ||
(A similar approach was also used in the main vertical signal path of the [[7A29]] several years later.) | (A similar approach was also used in the main vertical signal path of the [[7A29]] several years later.) | ||
From serial number 101 to 1349, the low frequency path starts with a | |||
[[2N1429]] PNP emitter-follower stage. | From serial number 101 to 1349, the low frequency path starts with a 25 kΩ resistor that DC-couples the input signal to a | ||
After that is a [[151-103]] NPN common-emitter. The high frequency path starts | [[2N1429]] PNP emitter-follower stage. After that is a [[151-103]] NPN common-emitter. The high frequency path starts | ||
with a trigger pickoff transformer on the input. The pickoff signal feeds a common-base amplifier | with a trigger pickoff transformer on the input. The pickoff signal feeds a common-base amplifier | ||
that uses a [[2N700]] PNP transistor. The low frequency and high frequency trigger paths meet at the trigger output of the | that uses a [[2N700]] PNP transistor. The low frequency and high frequency trigger paths meet at the trigger output of the | ||
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to amplify the entire frequency range. | to amplify the entire frequency range. | ||
== Comparison with S1 Sampling Heads == | === Comparison with S1 Sampling Heads === | ||
The sampler board in the 4S1 is roughly equivalent to a pair of [[ | The sampler board in the 4S1 is roughly equivalent to a pair of [[S-1]] sampling heads. | ||
A short piece of RG/174 coax connects the 661 timing pulse coaxial connector to the | A short piece of RG/174 coax connects the 661 timing pulse coaxial connector to the | ||
[[Connectors#SMB|SMB]] timing pulse input on the 4S1 sampler board. This signal triggers | [[Connectors#SMB|SMB]] timing pulse input on the 4S1 sampler board. This signal triggers | ||
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sub-chassis. | sub-chassis. | ||
==Specifications== | |||
[[Category:Specifications needed]] ''please add'' | |||
==Pictures== | |||
<gallery> | <gallery> | ||