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 [[Connectors#BSM|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 [[Connectors#BSM|BSM connector]]. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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{{Spec | Pre-trigger output | 85 ns before main pulse (jitter < 10 ps), +1 V into 50 Ω (BSM) }} | {{Spec | Pre-trigger output | 85 ns before main pulse (jitter < 10 ps), +1 V into 50 Ω (BSM) }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Internals== | |||
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 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== | ||