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S-42: Difference between revisions
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figure from manual
(specs) |
(figure from manual) |
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* [[Media:S42.pdf | S-42 manual with schematics]] | * [[Media:S42.pdf | S-42 manual with schematics]] | ||
}} | }} | ||
The '''Tektronix S-42''' is a sampling head for 1300 nm optical signals. It has an [[FC fiberoptic connector]] for the input signal. | The '''Tektronix S-42''' is a sampling head for 1300 nm optical signals. It has an [[FC/PC fiberoptic connector]] | ||
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 | |||
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. | |||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Pulse response | 55 ps }} | {{Spec | Pulse response | 55 ps }} | ||
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{{Spec | Spectral response | 1000 nm – 1700 nm }} | {{Spec | Spectral response | 1000 nm – 1700 nm }} | ||
{{Spec | Deflection | 50 μW/Div to 50 mW/Div @ 1300 nm }} | {{Spec | Deflection | 50 μW/Div to 50 mW/Div @ 1300 nm }} | ||
{{Spec | Noise equivalent power | | {{Spec | Noise equivalent power | 42 μW<sub>RMS</sub> max. }} | ||
{{Spec | Max. nondestructive input | 10 mW mean, 125 mW peak }} | |||
{{Spec | Features | | {{Spec | Features | | ||
* Mean power meter, dynamic range 5 nW to 5 mW (60 dB), bandwidth 100 Hz | * Mean power meter, dynamic range 5 nW to 5 mW (60 dB), bandwidth 100 Hz | ||
}} | }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Internals== | |||
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 | |||
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 | |||
calibration procedures, with the photodiode removed. | |||
==Pictures== | ==Pictures== | ||