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A sampling oscilloscope captures the time domain waveform at discrete time intervals using a [[Sampler|sampling circuit]]. These captured voltages are then either stored in an analog fashion (integrator circuits and CRTs) or digitized and processed digitally. | |||
Through the 1960s, the sampling group at Tektronix was led by [[Al Zimmerman]]. | |||
A distinction is made between sequential | A distinction is made between real-time and equivalent time sampling. Real-time sampling requires a sampling rate of at least twice the highest signal bandwidth to capture the signal without [https://en.wikipedia.org/wiki/Aliasing aliasing artifacts]. It is rare with analog oscilloscopes, but the method of choice for low to medium speed [[:Category:Digital storage scopes|digital storage oscilloscopes]], and allows for single shot waveform acquisition. | ||
Equivalent time sampling requires repetitive signals but allows to capture a fast signal with a sampling rate much slower than the signal bandwidth. When talking about a "Sampling Oscilloscope" this approach is usually referred to. For digital instruments the term [[:Category:Digital Sampling scopes|"Digital Sampling Oscilloscopes"]] is used. However the lines are blurry, since many instruments utilizing sampling concepts switch between different acquisition modes depending on the timebase setting. | |||
:{| | |||
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| [[File:RealTimeSampling_Fig29_XYZs_of_Oscill.png|500px]] || [[File:EquivTimeSampling_Fig32_XYZs_of_Oscill.png|400px]] | |||
|- | |||
| style="text-align:center;"|Real-Time Sampling || style="text-align:center;"|Equivalent Time Sampling | |||
|- | |||
|} | |||
Equivalent time sampling is further divided into sequential, and [[random sampling]]. | |||
Instruments that have a random sampling mode usually also have a sequential sampling mode, e.g., the [[7T11]]. | Instruments that have a random sampling mode usually also have a sequential sampling mode, e.g., the [[7T11]]. | ||
:{| style="width: 60%;" | |||
|- | |||
| [[File:RandomTimeSampling_Fig33_XYZs_of_Oscill.png|600px]] || [[File:SequentialTimeSampling_Fig34_XYZs_of_Oscill.png|600px]] | |||
|- | |||
| style="text-align:center;"|Random equivalent-time sampling: the sampling clock runs asynchronously with the input signal and the trigger. || style="text-align:center;"|Sequential equivalent-time sampling: the single sample is taken for each recognized trigger after a time delay which is incremented after each cycle. | |||
|- | |||
|} | |||
== Scopes == | == Scopes == | ||
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* [[567]] | * [[567]] | ||
* [[568]] | * [[568]] | ||
* [[ | * [[:Category:11800_series_mainframes|11800 Series]] | ||
* [[:Category:TDS800_series_scopes|TDS800 Series]] | |||
</div> | </div> | ||
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* [[4S2|4S2A]] | * [[4S2|4S2A]] | ||
* [[4S3]] | * [[4S3]] | ||
* [[ | * [[5S14N]] | ||
* [[5T1]] | * [[5T1]] | ||
* [[5T1A]] | * [[5T1A]] | ||
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* [http://w140.com/andrews_construction_of_broadband_sampling_head.pdf Construction of a Broadband Universal Sampling Head, J. R. Andrews and G. DeWitte] | * [http://w140.com/andrews_construction_of_broadband_sampling_head.pdf Construction of a Broadband Universal Sampling Head, J. R. Andrews and G. DeWitte] | ||
* [http://w140.com/tek_sampling_instruments_brochure.pdf Tektronix Sampling Instruments Brochure (PDF)] | * [http://w140.com/tek_sampling_instruments_brochure.pdf Tektronix Sampling Instruments Brochure (PDF)] | ||
* [[Media:Cliff moulton sensitive sampling plug-ins no ocr.pdf|Sensitive Sampling Plug-ins Add New Capabilities, Cliff Moulton (PDF, needs OCR)]] | |||
* [[Media:Sampling-Concepts ServiceScope Feb1965.pdf|February 1965 Service Scope: Sampling Concepts Reviewed]] | |||
* [[Media:Cern 61-15 nanosecond sampling oscilloscope.pdf]] | |||
* [[Media:Tektronix Type N Movie Notes.pdf|Transcript of "Sampling Oscilloscopes and Techniques" Training Film by Norm Winningstad (PDF)]] | |||
* [[Media:062-5260-00.pdf|Introduction to Sampling Concepts]] (PDF) | |||
* [[Media:03W-8605-3.pdf | XYZs of Oscilloscopes ]] (PDF) | |||
* [[Media:High speed measurements using sampling techniques.pdf|High-Speed Measurements Using Sampling Techniques (Student Workbook)]] (PDF) | |||
[[Category:Sampling scopes]] | [[Category:Sampling scopes]] |
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