S-50: Difference between revisions

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S-50 (view source)

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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 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-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.   
The S-52 has a 48-ohm resistor between the output tunnel diode and the main pulse output connector,
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.   
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.   
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
At the circuit level, the S-50 and S-52 differ significantly.
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.   
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.
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==
==Specifications==
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