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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}} | ||
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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. | 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== | ||
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<gallery> | <gallery> | ||
Tek-s52-front.jpg | S-52 front | |||
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> | ||
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> | </gallery> | ||
===Measurements=== | ===Measurements=== | ||
<gallery> | <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. | |||
</gallery> | </gallery> | ||
[[Category:7000 and 3S series sampling heads]] | [[Category:7000 and 3S series sampling heads]] |