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S-42: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Optical Sampling Head | | |series=7000 and 3S series sampling heads | ||
image=Tek s42.jpg | | |type=S-42 | ||
caption=S42 Head | |summary=Optical Sampling Head | ||
|image=Tek s42.jpg | |||
introduced=1989 | | |caption=S42 Head | ||
discontinued=1990 | | |introduced=1989 | ||
manuals= | |discontinued=1990 | ||
|designers= | |||
|manuals= | |||
* [[Media:S42.pdf | S-42 manual with schematics]] | * [[Media:S42.pdf | S-42 manual with schematics]] | ||
* [[Media:Tek s-42 specifics ordering information.pdf | S-42 Specifications Ordering Information]] | * [[Media:Tek s-42 specifics ordering information.pdf | S-42 Specifications Ordering Information]] | ||
}} | }} | ||
The '''Tektronix S-42''' is a sampling head for 1300 nm optical signals. It has an [[FC/PC connector|FC/PC fiberoptic connector]] | The '''Tektronix S-42''' is a sampling head for 1300 nm optical signals. It has an [[FC/PC connector|FC/PC fiberoptic connector]] for the input signal. It is essentially an [[S-4]] sampling head with a photodiode at the input. | ||
for the input signal. It is essentially an [[S-4]] sampling head with a photodiode at the input. | |||
Specified accuracy is for connections through 8/125 micron single-mode fibre, although | Specified accuracy is for connections through 8/125 micron single-mode fibre, although a lens in front of the photodiode allows connections using multi-mode fibre as well, at some degradation of response speed. | ||
a lens in front of the photodiode allows connections using multi-mode fibre as well, at some degradation | |||
of response speed. | |||
The manual shows it being used in a [[7S12]]-driven TDR setup with an external [[OT503|OT503 electro-optic converter]] as the optical signal source. | The manual shows it being used in a [[7S12]]-driven TDR setup with an external [[OT503|OT503 electro-optic converter]] as the optical signal source. | ||
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The S-42 borrows heavily from the [[S-4]] sampling head, re-using the S-4 strobe, sampler and preamp boards. | The S-42 borrows heavily from the [[S-4]] sampling head, re-using the S-4 strobe, sampler and preamp boards. | ||
It uses the same six-diode traveling-wave sampling gate, strobed by 125 ps | It uses the same six-diode traveling-wave sampling gate, strobed by 125 ps pulses generated using a [[snap-off diode]] driven by an avalanche transistor. | ||
pulses generated using a [[snap-off diode]] driven by an avalanche transistor. | |||
The S-4's SMA input connector is still present internally, and driven electrically in some of the | The S-4's SMA input connector is still present internally, and driven electrically in some of the calibration procedures, with the photodiode removed. | ||
calibration procedures, with the photodiode removed. | |||
To accommodate the photo diode, the S-42's case is longer than the S-4's. When inserted, | To accommodate the photo diode, the S-42's case is longer than the S-4's. When inserted, the S-42 therefore protrudes from the base unit by about two centimeters. | ||
the S-42 therefore protrudes from the base unit by about two centimeters. | |||
==Pictures== | ==Pictures== | ||