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Sampler: Difference between revisions
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corrected the two vs. 4 diode sampler info for the 4S2 vs 4S2A
(Created page with "The signal chain in sampling oscilloscopes contains a sampler, which measures the input signal at a moment in time. Some sampling scopes, e.g., the 11201, have the sampler...") |
(corrected the two vs. 4 diode sampler info for the 4S2 vs 4S2A) |
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The signal chain in sampling | The signal chain in [[sampling oscilloscope]]s contains a '''sampler''', | ||
which measures the input signal at a moment in time. | which measures the input signal at a moment in time. | ||
Some sampling scopes, e.g., the [[11201]], have the sampler as an built-in component. | Some sampling scopes, e.g., the [[11201]], have the sampler as an built-in component. | ||
Other sampling scopes have the sampler as a built-in component of the vertical plug-in, e.g., the [[3S76]]. | Other sampling scopes have the sampler as a built-in component of the vertical plug-in, e.g., the [[3S76]]. | ||
Another setup is to have the sampler in a sampling head, e.g., the [[S-4]]. | Another setup is to have the sampler in a sampling head, e.g., the [[S-4]]. | ||
Sampling sometimes plug directly into the oscilloscope mainframe, e.g., in the [[11801]]. | Sampling heads sometimes plug directly into the oscilloscope mainframe, e.g., in the [[11801]]. | ||
In other cases, the sampling head plugs into a vertical plug-in, e.g., the [[7S11]], which plugs into the oscilloscope mainframe. | In other cases, the sampling head plugs into a vertical plug-in, e.g., the [[7S11]], which plugs into the oscilloscope mainframe. | ||
Sampling heads can also be used on extension cables, e.g., the [[S-series_sampling_head_extenders|012-0125-00]], | Sampling heads can also be used on extension cables, e.g., the [[S-series_sampling_head_extenders|012-0125-00]], | ||
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== One-Diode Sampler== | == One-Diode Sampler== | ||
This is used in the [[N|Type N]]. | This is used in the [[N|Type N]]. A single diode provides no symmetry and so the strobe pulse leakage (kick-out) is large. | ||
<gallery> | <gallery> | ||
Tek n sampler.png|Tek [[N|Type N]] sampler. The "interrogate diode" is the sampling diode. | Tek n sampler.png|Tek [[N|Type N]] sampler. The "interrogate diode" is the [[sampling diode]]. | ||
</gallery> | </gallery> | ||
== Two-Diode Sampler== | == Two-Diode Sampler== | ||
This is used in the | This is used in the [[1S2]], [[4S2A]], [[1502]], [[S-1]], [[S-2]], and the [[7S14]]. | ||
<gallery> | <gallery> | ||
Tek s1 sampler schematic.png|Tek [[S-1]] sampler | Tek s1 sampler schematic.png|Tek [[S-1]] sampler | ||
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== Four-Diode Sampler== | == Four-Diode Sampler== | ||
This is used in the [[1S1]], [[3S1]], [[3S76]], [[4S1]] and the early [[4S2]]. | |||
<gallery> | |||
Tek s76 sampler a.png|Tek [[3S76]] sampler | |||
</gallery> | |||
== Six-Diode Sampler== | |||
This is used in the [[S-4]], [[S-6]], [[SD-24]] and [[SD-24]]. | |||
It is often called a traveling-wave sampler. The effective sampling duration is shorter than the width of the strobe pulse and for fast diodes only depends on the trailing edge of the strobe pulse and the delay of the transmission line between the diodes. For the [[S-4]] and [[S-6]] sampling gates the internal sampling diodes are reverse biased at a higher voltage, while the outer four diodes are reverse biased at about 0.6 V. The sampling signal is the charge trapped between the outer four diodes by the trailing edge of the strobe pulse. | |||
<gallery> | |||
Tek s4 sampler.png | |||
</gallery> | |||
* [http://w140.com/frye_s4_gate.pdf George Frye's Explanation of S-4 sampler in October 1968 Service Scope (PDF)] | |||
* [[H2464]] | |||
[[Category:Circuits and Concepts]] | |||