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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  
|manufacturer=Tektronix
[[Connectors#SMA|SMA connector]].  The
|series=7000 and 3S series sampling heads
PRETRIG OUT and TRIG OUT signals use [[Connectors #BSM|BSM connectors]].
|type=S-50
|summary=Pulse Generator
|image=Tek s-50 front.jpg
|caption=S-50 Head
|introduced=1969
|discontinued=1976
|designers=
|manuals=
* [[Media:070-0897-00.pdf|Tektronix S-50 Manual]]
* [[Media:Tek s-50 eis signature page.pdf|Tektronix S-50 Engineering Instrument Specification signature page]]
}}
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 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.
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. 


== 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 400mV,
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 that the presence of a TRIG OUT
on the front of the of S-50. 
Both have PRETRIGGER OUT. 
The pretrigger of the S-50 leads the main pulse by 75ns. 
The pretrigger of the S-52 leads the main pulse by 85ns. 
At the circuit level, the S-50 and S-52 differ significantly.
At the circuit level, the S-50 and S-52 differ significantly.
Both use a current switch to bias the output tunnel diode when
Both use a current switch to bias the output tunnel diode when it is in the "armed" state.   
it is in the "armed" state.  The S-50 uses another tunnel diode
The S-50 uses another tunnel diode to add a short pulse of current that "fires" the output 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.   
The S-52 uses a snap-off diode to generate this firing pulse.   
 
Sequencing of events (arming the output diode, firing it, resetting it)
Sequencing of events (arming the output diode, firing it, resetting it) is controlled by analog timing circuits in the S-50.
is controlled by analog timing circuits in the S-50. The S-52 uses a  
The S-52 uses a digital counter and a decoder to generate the internal control signals.
digital counter and a decoder to generate the internal control signals.


==Specifications==


{| border="1" style="text-align: center;"
:{| class="wikitable"
|+ Comparison of S-50 with S-52
|-
! scope="col" |
! scope="col" |
! scope="col" | S-50
! scope="col" | S-50
Line 40: Line 44:
|-
|-
! scope="col" | Risetime
! scope="col" | Risetime
| under 25ps
| under 25 ps
| under 25ps
| under 25 ps
|-
|-
! scope="col" | Amplitide
! scope="col" | Amplitude
| 400mV into 50 ohms
| 400 mV into 50 Ω
| 200mV into 50 ohms
| 200 mV into 50 Ω
|-
|-
! scope="row" | Output impedance
! scope="row" | Output impedance
| varies, not specified || 50 ohms
| varies, not specified || 50 Ω
|-
|-
! scope="row" | Sequencing of internal events
! scope="row" | Sequencing of internal events
Line 55: Line 59:
|-
|-
! scope="row" | Pretrigger lead time
! scope="row" | Pretrigger lead time
| 75ns
| 75 ns
| 85ns
| 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  
! scope="row" | Trigger (with pulse) output  
| yes, 200mV into 50 ohms
| yes, 200 mV into 50 Ω
| no
| no
|-
|-
Line 67: Line 79:
|}
|}


==Links==
{{Documents|Link=S-50}}
{{PatentLinks|S-50}}


* [http://w140.com/tek_s-50.pdf Tektronix S-50 Manual (46MB, PDF)]
==Pictures==
* [http://w140.com/tek_s-series_sampling_heads.pdf Tektronix S-Series Sampling Heads (195MB, PDF)]
 


<gallery>
<gallery>
File:Tek s-50 block.png|block diagram
Tek s-50 block.png|block diagram
Image:S-50 schem.png|schematic
S-50 schem.png|schematic
Image:Tek s-50.JPG|front view
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]]

Latest revision as of 10:51, 19 June 2024

Tektronix S-50
Pulse Generator
S-50 Head

Compatible with 7000 and 3S series sampling heads

Produced from 1969 to 1976

Manuals
Manuals – Specifications – Links – Pictures

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 connectors.

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

S-50 S-52
Risetime under 25 ps under 25 ps
Amplitude 400 mV into 50 Ω 200 mV into 50 Ω
Output impedance varies, not specified 50 Ω
Sequencing of internal events analog timing circuit digital state-machine
Pretrigger lead time 75 ns 85 ns
Pretrigger to pulse jitter 15 ps 10 ps
Pulse repetition rate 25 kHz 120 kHz
Trigger (with pulse) output yes, 200 mV into 50 Ω no
Output TD tripper scheme current pulse through TD bias transistor snap-off diode capacitively coupled to TD, like in 284

Links

Documents Referencing S-50

Document Class Title Authors Year Links
Service Scope 52 Oct 1968.pdf Article The State of the Art in Sampling Al Zimmerman 1968 S-1 • S-2 • S-3 • S-4 • S-50 • S-51 • 285 • 3S1 • 3S2 • 3S5 • 3S6 • 3T2 • 3T5 • 3T6 • 3T77A • 568 • 230

Pictures

  • block diagram

    block diagram

  • schematic

    schematic

  • front view

    front view

  • left internal view

    left internal view

  • right internal view

    right internal view

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