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The Tektronix S-50 is a pulse generator head the produces 400mV pulses
{{Plugin Sidebar
with a risetime under 25ps.  The pulse output is an SMA connector.  The
|manufacturer=Tektronix
PRETRIG OUT and TRIG OUT signals use BSM connectors.
|series=7000 and 3S series sampling heads
|type=S-50
|summary=Pulse Generator
|image=Tek s-50 front.jpg
|caption=S-50 Head
|introduced=1969
|discontinued=1975 
|designers=
|manuals=
* [[Media:070-0897-00.pdf|Tektronix S-50 Manual]]
}}
The '''Tektronix S-50''' is a pulse generator head that produces 400 mV pulses with a rise time under 25 ps.   
The pulse output is an [[SMA connector]].  The PRETRIG OUT and TRIG OUT signals use [[BSM connector]]s.
 
The output diode is the same one that the [[S-52]] uses, the [[153-0040-00]].
The internal timing circuitry of the S-50 uses two [[152-0379-00]] tunnel diodes.
 
== Comparison of S-50 and S-52 ==
The S-50 is similar to the [[S-52]], but the output pulse amplitude of the S-50 is 400 mV, twice that of the S-52. 
The S-50's output tunnel diode is directly connected to the main pulse output connector. 
The S-52 has a 48-ohm resistor between the output tunnel diode and the main pulse output connector, resulting in a 2:1 voltage divider. 
Another difference between the S-50 and S-52 is the presence of a TRIG OUT on the front of the of S-50.
Both have PRETRIGGER OUT connectors.
The pretrigger of the S-50 leads the main pulse by 75 ns, that of the S-52 by 85 ns. 
 
At the circuit level, the S-50 and S-52 differ significantly.
Both use a current switch to bias the output tunnel diode when it is in the "armed" state. 
The S-50 uses another tunnel diode to add a short pulse of current that "fires" the output tunnel diode.
The S-52 uses a [[snap-off diode]] to generate this firing pulse. 
 
Sequencing of events (arming the output diode, firing it, resetting it) is controlled by analog timing circuits in the S-50.
The S-52 uses a digital counter and a decoder to generate the internal control signals.
 
==Specifications==
 
:{| class="wikitable"
|-
! scope="col" |
! scope="col" | S-50
! scope="col" | S-52
|-
! scope="col" | Risetime
| under 25 ps
| under 25 ps
|-
! scope="col" | Amplitude
| 400 mV into 50 Ω
| 200 mV into 50 Ω
|-
! scope="row" | Output impedance
| varies, not specified || 50 Ω
|-
! scope="row" | Sequencing of internal events
| analog timing circuit
| digital state-machine
|-
! scope="row" | Pretrigger lead time
| 75 ns
| 85 ns
|-
! scope="row" | Pretrigger to pulse jitter
| 15 ps
| 10 ps
|-
! scope="row" | Pulse repetition rate
| 25 kHz
| 120 kHz
|-
! scope="row" | Trigger (with pulse) output
| yes, 200 mV into 50 Ω
| no
|-
! scope="row" | Output TD tripper scheme
| current pulse through TD bias transistor
| snap-off diode capacitively coupled to TD, like in [[284]]
|}
 
==Pictures==


<gallery>
<gallery>
Image:S-50 schem.png
Tek s-50 block.png|block diagram
S-50 schem.png|schematic
Tek s-50.JPG|front view
Tek s-50 20203 1.jpg
Tek s-50 20203 2.jpg
Tek s-50 left internal.jpg|left internal view
Tek s-50 right internal.jpg|right internal view
</gallery>
</gallery>
[[Category:7000 and 3S series sampling heads]]
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