S-42: Difference between revisions
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* [[Media:S42.pdf | S-42 manual with schematics]] | * [[Media:S42.pdf | S-42 manual with schematics]] | ||
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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== | ||
Revision as of 00:19, 26 July 2015
Template:Plugin Sidebar 2 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 electro-optic converter as the optical signal source.
Key Specifications
| Pulse response | 55 ps |
|---|---|
| Bandwidth | 6.4 GHz (equiv.) |
| Spectral response | 1000 nm – 1700 nm |
| Deflection | 50 μW/Div to 50 mW/Div @ 1300 nm |
| Noise equivalent power | 42 μWRMS max. |
| Max. nondestructive input | 10 mW mean, 125 mW peak |
| Features |
|
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
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Description in 1989 Catalog
