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Manual | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
|series=7000 and 3S series sampling heads | |||
|type=S-52 | |||
|summary=Pulse Generator | |||
|image=Tek-s52-front.jpg | |||
|caption=S-52 head, front panel | |||
|introduced=1971 | |||
|discontinued=1990 | |||
|designers=Murlan Kaufman | |||
|manuals= | |||
* [[Media:070-1101-01.pdf|Tektronix S-52 Instruction Manual, Revised Sep 1985]] | |||
* [[Media:070-1101-01 early.pdf|Tektronix S-52 Instruction Manual, Early Version]] | |||
}} | |||
The '''Tektronix S-52''' is a pulse generator head compatible with S-series sampling units | |||
like the [[3S2]], [[7S11]], and [[7S12]]. | |||
It was designed by [[Murlan Kaufman]]. | |||
It makes use of [[Patent US 3612910A|US Patent US3612910A, "Triggered Pulse Generator Having Automatic Bias Adjustment"]]. | |||
It puts out a 200 mV pulse into a load of 50 Ω. | |||
The pulse has a rise time of 25 ps or less. | |||
The output is an [[SMA connector]]. | |||
In addition to the main pulse output, the S-52 also produces a pre-trigger pulse 85 ns before the main pulse. | |||
The delay is generated with a digital counter, and jitter between the pre-trigger pulse and the main pulse is specified as less than 10 ps. | |||
The pre-trigger pulse uses a [[BSM connector]]. | |||
{{BeginSpecs}} | |||
{{Spec | Rise time | < 25 ps}} | |||
{{Spec | Output amplitude | 200 mV into 50 Ω (SMA)}} | |||
{{Spec | Pulse Duration | > 350 ns}} | |||
{{Spec | Output impedance | 50 Ω «reverse terminated» (i.e. having controlled source impedance) }} | |||
{{Spec | Pre-trigger output | 85 ns before main pulse (jitter < 10 ps), +1 V into 50 Ω (BSM) }} | |||
{{EndSpecs}} | |||
==Internals== | |||
The S-52 generates the main output pulse using a | |||
50 mA low-capacitance [[tunnel diodes|tunnel diode]] with part number [[153-0040-00]]. | |||
The S-52 is [[S-50#Comparison_of_S-50_and_S-52|similar to the S-50]], | |||
but the S-50 has twice the pulse amplitude. | |||
The reason for this is that the S-52 has a 48 Ω resistor between the output tunnel diode | |||
and the output connector providing back termination, while the S-50 has no such resistor. | |||
Although the S-52 produces a smaller pulse, its output impedance is much better controlled than that of the S-50, | |||
and the output resistor may also provide some limited protection for the output tunnel diode. | |||
The S-52 uses a [[156-0048-00]] (LM3046) transistor array in the timing board. | |||
==Links== | |||
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/S-52.html Tek S-52 page @ amplifier.cd] | |||
* [http://www.barrytech.com/tektronix/tek7000/teks52.html Tektronix S-52 @ barrytech.com] | |||
==See Also== | |||
* [[25ps Push-Pull Pulse Generator]] | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek-s52-front.jpg | S-52 front | |||
S-52_front_A_prototype.jpg | S-52 front A-prototype | |||
7s12-s6-s52-f.jpg | S-52 pulse generator and [[S-6|S-6 sampling head]] in a [[7S12|7S12 TDR/Sampler plugin]] | |||
S-52_A_prototype.jpg | A-prototype of S-52 | |||
</gallery> | </gallery> | ||
===Internal=== | |||
<gallery> | |||
Tek-s52-1.jpg | A1 Timing board (right) | |||
Tek-s52-2.jpg | A3 Trigger board (left) | |||
Tek-s52-3.jpg | A2 Tunnel Diode Control board (center) | |||
Tek-s52-4.jpg | Tunnel diode mount | |||
Tek-s52-diode-mount.jpg | Tunnel diode mount, detail | |||
Tek_s-52_schem2.png |Schematic | |||
</gallery> | |||
===Measurements=== | |||
<gallery> | |||
7s12-self-portrait.jpg | TDR "Self Portrait" — pulse reflected on S-6 "through" path (approx. 120 ps one way) | |||
7s12-s52-incident.jpg | 7S12 displaying the incident pulse from an S-52 (nom. < 25 ps) through an S-6 head (nom. < 30 ps). Displayed rise time ~35 ps confirms spec. | |||
7s12-s52-pulse-1.jpg | Full pulse pattern of a 7S12/S-52 in real time (top trace) and sampled (bottom trace) shown simultaneously on [[7844]]. 7S12 trace at slowest possible sweep. | |||
7s12-s52-pulse-2.jpg | S-52 pulse in real time (top trace) and sampled (bottom trace) shown simultaneously on [[7844]]. Approximately equal time scales. | |||
S_52_a_prototype_wfm.png | Full pulse pattern of a S-52 (A-prototype) , driven by 3S6 (freerunning) | |||
</gallery> | |||
[[Category:7000 and 3S series sampling heads]] | |||