Difference between revisions of "S-53"

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The Tektronix S-53 Trigger Recognizer is essentially the entire trigger circuit of an oscilloscope. It
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{{Plugin Sidebar 2|
is rated to 1GHz and has a BNC input with 50-ohm impedance. It uses tunnel diode triggering with an
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title=Tektronix S-53 |
amplifier before the tunnel diode. The input signal to trigger out jitter is rated at 15ps or less.
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summary=Trigger Recognizer |
The trigger-out signal is 1V into 50 ohms, with 600mV/ns slew rate.
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image=Tek-s53.jpg |
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caption=S-53 head |
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series=[[3S2]], [[7S11]], [[7S12]] Sampling Plugins |
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introduced=1971 |
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discontinued=1989|
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manuals=
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* [http://w140.com/tek_s53_oct1987.pdf Tektronix S-53 Manual (October 1987, good quality, PDF)]
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* [http://w140.com/tek_s53.pdf Tektronix S-53 Manual (bad text, good schematic) (PDF)]
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* [http://w140.com/tek_s53_good.pdf Tektronix S-53 Manual (good text, bad schematic) (PDF)]
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* [http://w140.com/tek_s53_sch.png Tektronix S-53 Schematic (PNG)]
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}}
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The Tektronix S-53 '''Trigger Recognizer''' head can be used in the right bay of the [[7S12]] TDR/Sampler plug-in
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or externally in a type [[285]] enclosure. It essentially contains the entire trigger circuit of an oscilloscope.
  
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{{BeginSpecs}}
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{{Spec | Bandwidth | 1 GHz }}
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{{Spec | Input impedance | 50 Ω [[BNC connector]] }}
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{{Spec | Sensitivity | 10 mV to 1 V (p-p) }}
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{{Spec | Jitter | max. 15 ps or less (from input signal to trigger-out) }}
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{{Spec | Delay | 15 ns (from input signal to trigger-out) }}
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{{Spec | Trigger-out signal | 1 V into 50 Ω with 600 mV/ns slew rate }}
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{{EndSpecs}}
  
* [http://w140.com/tek_s53.pdf Tektronix S-53 Manual (bad) (PDF)]
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==Internals==
* [http://w140.com/tek_s53_good.pdf Tektronix S-53 Manual (good) (PDF)]
 
  
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The S-53 uses tunnel diode triggering with an amplifier before the tunnel diode. 
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The signal first passes through a compensated NPN differential amplifier, Q10 and Q12, which provides
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an adjustable trigger offset voltage and trigger polarity selection. Switching diodes CR6 and CR8 are
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used for selecting the trigger polarity.  The differential amplifier (i.e., phase splitter) generates
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both phases, inverted and non-inverted.  Depending on the position of the trigger polarity switch, one
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or the other of the phases is shunted by 200 Ω resistor.  The two signals are buffered by common-base
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amplifiers Q20 and Q22, whose collector currents are summed.  R25 sets up a bias current on trigger
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tunnel diode CR25.  The extra current from Q20 or Q22 pushes CR25 over its peak current, and it switches
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to the high voltage state. 
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==Pictures==
 
<gallery>
 
<gallery>
Image:Tek s-53.jpg
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Tek-s53.jpg
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Tek s-53 on cart.jpg
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Tek s53 left.jpg
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Tek s-53.jpg|Front
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TEKS53 b40391.jpg|Front
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Tek s53 bottom.jpg
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Tek s53 top.jpg
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Tek s53 right.jpg
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Tek s53 right2.jpg
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Tek s53 rear.jpg
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7s12-7s11-1ghz-store.jpg | S-53 in a [[7S12]] displaying a 1 GHz sine using a [[S-6]] sampling head. 2<sup>nd</sup> channel (top) on a [[7S11]] with [[S-4]] sampling head.
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Tek s-53 in hand.jpg
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Tek s53 sch.png|Schematic
 
</gallery>
 
</gallery>
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[[Category:7000 and 3S series sampling heads]]

Latest revision as of 11:09, 7 November 2017

Manuals – Specifications – Links – Pictures

The Tektronix S-53 Trigger Recognizer head can be used in the right bay of the 7S12 TDR/Sampler plug-in or externally in a type 285 enclosure. It essentially contains the entire trigger circuit of an oscilloscope.

Specifications

Bandwidth 1 GHz
Input impedance 50 Ω BNC connector
Sensitivity 10 mV to 1 V (p-p)
Jitter max. 15 ps or less (from input signal to trigger-out)
Delay 15 ns (from input signal to trigger-out)
Trigger-out signal 1 V into 50 Ω with 600 mV/ns slew rate

Internals

The S-53 uses tunnel diode triggering with an amplifier before the tunnel diode.

The signal first passes through a compensated NPN differential amplifier, Q10 and Q12, which provides an adjustable trigger offset voltage and trigger polarity selection. Switching diodes CR6 and CR8 are used for selecting the trigger polarity. The differential amplifier (i.e., phase splitter) generates both phases, inverted and non-inverted. Depending on the position of the trigger polarity switch, one or the other of the phases is shunted by 200 Ω resistor. The two signals are buffered by common-base amplifiers Q20 and Q22, whose collector currents are summed. R25 sets up a bias current on trigger tunnel diode CR25. The extra current from Q20 or Q22 pushes CR25 over its peak current, and it switches to the high voltage state.

Pictures