S-52: Difference between revisions

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In addition to the main pulse output, the S-52 also produces a pre-trigger pulse 85 ns before the main pulse.   
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]].
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}}
{{BeginSpecs}}
Line 32: Line 34:
The S-52 generates the main output pulse using a 50 mA low-capacitance [[tunnel diodes|tunnel diode]] with part number [[153-0400-00]].   
The S-52 generates the main output pulse using a 50 mA low-capacitance [[tunnel diodes|tunnel diode]] with part number [[153-0400-00]].   


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 S-52 is [[S-50#Comparison_of_S-50_and_S-52|similar to the S-50]],
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.
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.


==Links==
==Links==
Line 42: Line 48:


<gallery>
<gallery>
File:Tek-s52-front.jpg | S-52 front
Tek-s52-front.jpg | S-52 front
File:7s12-s6-s52-f.jpg | S-52 pulse generator and [[S-6|S-6 sampling head]] in a [[7S12|7S12 TDR/Sampler plugin]]
7s12-s6-s52-f.jpg | S-52 pulse generator and [[S-6|S-6 sampling head]] in a [[7S12|7S12 TDR/Sampler plugin]]
</gallery>
</gallery>


===Internal===
===Internal===
<gallery>
<gallery>
File:Tek-s52-1.jpg    | A1 Timing board (right)
Tek-s52-1.jpg    | A1 Timing board (right)
File:Tek-s52-2.jpg    | A3 Trigger board (left)
Tek-s52-2.jpg    | A3 Trigger board (left)
File:Tek-s52-3.jpg    | A2 Tunnel Diode Control board (center)
Tek-s52-3.jpg    | A2 Tunnel Diode Control board (center)
File:Tek-s52-4.jpg    | Tunnel diode mount
Tek-s52-4.jpg    | Tunnel diode mount
File:Tek-s52-diode-mount.jpg | Tunnel diode mount, detail
Tek-s52-diode-mount.jpg | Tunnel diode mount, detail
File:Tek_s-52_schem2.png |Schematic
Tek_s-52_schem2.png |Schematic
</gallery>
</gallery>


===Measurements===
===Measurements===
<gallery>
<gallery>
File:7s12-self-portrait.jpg | TDR "Self Portrait" — pulse reflected on S-6 "through" path (approx. 120 ps one way)
7s12-self-portrait.jpg | TDR "Self Portrait" — pulse reflected on S-6 "through" path (approx. 120 ps one way)
File: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-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.
File: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-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.
File: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.
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.
</gallery>
</gallery>




[[Category:7000 and 3S series sampling heads]]
[[Category:7000 and 3S series sampling heads]]

Revision as of 17:55, 3 February 2018

Template:Plugin Sidebar 2

The Tektronix S-52 is a pulse generator head compatible with S-series sampling units like the 3S2, 7S11, and 7S12.

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.

Key Specifications

Rise time < 25 ps
Output amplitude 200 mV into 50 Ω (SMA)
Output impedance 50 Ω «reverse terminated» (i.e. having controlled source impedance)
Pre-trigger output 85 ns before main pulse (jitter < 10 ps), +1 V into 50 Ω (BSM)

Internals

The S-52 generates the main output pulse using a 50 mA low-capacitance tunnel diode with part number 153-0400-00.

The S-52 is 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.

Links

Pictures

Internal

Measurements