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The Tektronix Type S-51 is a synchronizing head for [[sampling oscilloscope]] systems. | The Tektronix Type S-51 is a synchronizing head for [[sampling oscilloscope]] systems such as the [[3S2]] | ||
which use S-series sampling heads. | |||
From a periodic input signal in the 1GHz to 18GHz range, | From a periodic input signal in the 1GHz to 18GHz range, | ||
the S-51 generates trigger pulses which have a fixed time relationship with the input signal. | the S-51 generates trigger pulses which have a fixed time relationship with the input signal. | ||
The input is a 50-ohm [[Connectors#SMA|SMA]] connection. The input impedance is 50 ohms real | |||
in parallel with 1pF. The minimum input sensitivity is 100mVpp and the maximum kickout is | |||
400mV. The maximum jitter of the generated trigger signal is specified to be 15ps for input | |||
signals less than 5GHz and 10ps for input signals above 5Ghz. | |||
The S-51 | Equivalent-time sampling equipment generally requires the input signal to be repetitive. | ||
The S-51 is more restrictive; it is specifically designed for periodic signals. This is true | |||
of all oscilloscopes that use synchronization instead of triggering. | |||
The S-51 uses a [[Connectors#BSM|BSM connector]] for its trigger | The S-51 contains a [[tunnel diodes|tunnel diode]] sync oscillator that oscillates at about 200 MHz (165 MHz to 285 MHz). | ||
The input signal is coupled with this oscillator, resulting in injection locking. | |||
When locked, f_osc is a subharmonic of f_in. | |||
* f_osc = f_in / n, where n is an integer between 5 and 90, inclusive | |||
* f_osc is between 165 MHz and 285 MHz. | |||
The approximate range of f_osc is adjustable. | |||
Trigger pulses are produced at a preset phase of the sync oscillator. | |||
After each trigger pulse is produced, the sync oscillator is turned off for about 15 microseconds. | |||
As a result, the S-51 produces trigger pulses at a repetition rate of approximately 67 kHz. | |||
The S-51 uses a [[Connectors#BSM|BSM connector]] for its trigger output on the front panel. | |||
* [http://w140.com/tek_s-51.pdf Tektronix S-51 Manual (PDF)] | * [http://w140.com/tek_s-51.pdf Tektronix S-51 Manual (PDF)] |