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S-50: Difference between revisions
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The internal timing circuitry of the S-50 uses two [[152-0379-00]] tunnel diodes. | The internal timing circuitry of the S-50 uses two [[152-0379-00]] tunnel diodes. | ||
== Comparison of S-50 and S-52 == | |||
The S-50 is similar to the [[S-52]], | The S-50 is similar to the [[S-52]], | ||
but the output pulse amplitude of the S-50 is 400mV, | but the output pulse amplitude of the S-50 is 400mV, | ||
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The S-52 has a 48-ohm resistor between the output tunnel diode | The S-52 has a 48-ohm resistor between the output tunnel diode | ||
and the main pulse output connector, | and the main pulse output connector, | ||
resulting in a 2:1 voltage divider. | resulting in a 2:1 voltage divider. | ||
Another difference between the | |||
S-50 and S-52 is that the presence of a TRIG OUT | |||
on the front of the of S-50. | |||
Both have PRETRIGGER OUT. | |||
The pretrigger of the S-50 leads the main pulse by 75ns. | |||
The pretrigger of the S-52 leads the main pulse by 85ns. | |||
At the circuit level, the S-50 and S-52 differ significantly. | |||
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. | |||
* [http://w140.com/tek_s-series_sampling_heads.pdf Tektronix S-Series Sampling Heads (PDF)] | * [http://w140.com/tek_s-series_sampling_heads.pdf Tektronix S-Series Sampling Heads (PDF)] | ||