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S-2: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Sampling Head | | |series=7000 and 3S series sampling heads | ||
image=Tek s2 front crop.jpg | | |type=S-2 | ||
caption=S-2 head | |summary=Sampling Head | ||
|image=Tek s2 front crop.jpg | |||
introduced=1967 | | |caption=S-2 head | ||
discontinued=1989 | | |introduced=1967 | ||
manuals= | |discontinued=1989 | ||
* [http://bama.edebris.com/download/tek/s2/s2.djvu Tektronix S-2 Manual (DjVu) | |designers= | ||
|manuals= | |||
* [[Media:070-0764-00.pdf|Tektronix S-2 Manual]] (PDF) | |||
* [http://bama.edebris.com/download/tek/s2/s2.djvu Tektronix S-2 Manual @ BAMA] (DjVu) | |||
* [[Media:070-3012-00.pdf|Digital Measurement System S-2 Calibration (PDF, needs OCR)]] | * [[Media:070-3012-00.pdf|Digital Measurement System S-2 Calibration (PDF, needs OCR)]] | ||
}} | }} | ||
The '''Tektronix S-2 Sampling Head''' plug-in provides a single | The '''Tektronix S-2 Sampling Head''' plug-in provides a single [[GR-874 connector|GR-874]] 50 Ω input with a 75 ps risetime. | ||
[[GR-874 connector|GR-874]] 50 Ω input with a 75 ps risetime. | |||
The S-2 can be used in the 7000 series and 3S series of [[sampling oscilloscope|sampling plug-ins]]. | The S-2 can be used in the 7000 series and 3S series of [[sampling oscilloscope|sampling plug-ins]]. | ||
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Noise is specified as less than 10 mV. | Noise is specified as less than 10 mV. | ||
When the S-2 was first introduced, the rise-time specification was 50 ps, but that | When the S-2 was first introduced, the rise-time specification was 50 ps, but that was not achieved in practice, so the rise-time specification was revised to be 75 ps. | ||
was not achieved in practice, so the rise-time specification was revised to be 75 ps. | |||
The interface between the GR-874 connector and the printed circuit board is described in US Patent 3,426,311. | The interface between the GR-874 connector and the printed circuit board is described in US Patent 3,426,311. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Rise time | 75 ps }} | {{Spec | Rise time | 75 ps (50 ps initially) }} | ||
{{Spec | Bandwidth | 4.66 GHz eq.}} | {{Spec | Bandwidth | 4.66 GHz eq.}} | ||
{{Spec | Operating input voltage range | −1 V to +1 V with ≤1 V<sub>p-p</sub> signals }} | {{Spec | Operating input voltage range | −1 V to +1 V with ≤1 V<sub>p-p</sub> signals }} | ||
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==Similarity to [[S-1]]== | ==Similarity to [[S-1]]== | ||
The S-1 and S-2 samplers are constructed very similarly. The mechanical construction including internal connector locations is identical, and the preamp boards are almost identical. The main difference in these boards is the value of the gain adjust trimpot R46, which is 5k for the S-1 and 30k for the S-2, to allow higher gain settings to compensate for the shorter sampling pulses of the S-2. Bipolar transistors Q41 and Q45 are different types (why?). Preamp boards can be swapped between S-1s and S-2s for testing without issues. | The S-1 and S-2 samplers are constructed very similarly. The mechanical construction including internal connector locations is identical, and the preamp boards are almost identical. The main difference in these boards is the value of the gain adjust trimpot R46, which is 5k for the S-1 and 30k for the S-2, to allow higher gain settings to compensate for the shorter sampling pulses of the S-2. Bipolar transistors Q41 and Q45 are different types (why?). Preamp boards can be swapped between S-1s and S-2s for testing purposes without issues. | ||
The strobe boards use identical active components ([[avalanche transistor]] Q69 [[153-0556-00]] and [[Snap-off diode]] D61 152-0335-00), but the board layout is different to accommodate longer strobe clipping lines in the S-1. | The strobe boards use identical active components ([[avalanche transistor]] Q69 [[153-0556-00]] and [[Snap-off diode]] D61 152-0335-00), but the board layout is different to accommodate longer strobe clipping lines in the S-1. | ||
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==Repair issues== | ==Repair issues== | ||
*The input should always be terminated when not in use because the [[sampling diodes]] are easily damaged by excessive inputs or static discharge. See that article for possible replacements. | * The input should always be terminated when not in use because the [[sampling diodes]] are easily damaged by excessive inputs or static discharge. See that article for possible replacements. | ||
*The ground contact of input termination resistor R4 can become intermittent, causing the input impedance to go high or fluctuating. The cure is to disassemble the sampler incuding the sampler board covers, and then carefully bend the ground tabs of the input termination resistor outward. | * The ground contact of input termination resistor R4 can become intermittent, causing the input impedance to go high or fluctuating. The cure is to disassemble the sampler incuding the sampler board covers, and then carefully bend the ground tabs of the input termination resistor outward. | ||
==Prices== | |||
1979: $780 (~$3,000 in 2022 Dollars) | |||
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], in 1979 annual sales were estimated at 321 units. | |||
==Pictures== | ==Pictures== | ||