S-50: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
No edit summary
Line 7: Line 7:
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,  
Line 14: Line 15:
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)]

Revision as of 08:33, 22 September 2013

The Tektronix S-50 is a pulse generator head the produces 400mV pulses with a risetime under 25ps. The pulse output is an SMA connector. The PRETRIG OUT and TRIG OUT signals use BSM connectors.

The output diode is the same one that the S-52 uses, the 153-0040-00. 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, but the output pulse amplitude of the S-50 is 400mV, twice that of the S-52. 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. 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.