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S-53: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Trigger Recognizer | | |series=7000 and 3S series sampling heads | ||
image=Tek-s53.jpg | | |type=S-53 | ||
caption=S-53 head | |summary=Trigger Recognizer | ||
|image=Tek-s53.jpg | |||
introduced=1971 | | |caption=S-53 head | ||
discontinued=1989| | |introduced=1971 | ||
manuals= | |discontinued=1989 | ||
|designers= | |||
|manuals= | |||
* [http://w140.com/tek_s53_oct1987.pdf Tektronix S-53 Manual (October 1987, good quality, PDF)] | * [http://w140.com/tek_s53_oct1987.pdf Tektronix S-53 Manual (October 1987, good quality, PDF)] | ||
* [http://w140.com/tek_s53.pdf Tektronix S-53 Manual (bad text, good schematic) (PDF)] | * [http://w140.com/tek_s53.pdf Tektronix S-53 Manual (bad text, good schematic) (PDF)] | ||
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The S-53 uses tunnel diode triggering with an amplifier before the tunnel diode. | 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 | The signal first passes through a compensated NPN differential amplifier, Q10 and Q12, which provides an adjustable trigger offset voltage and trigger polarity selection. | ||
an adjustable trigger offset voltage and trigger polarity selection. Switching diodes CR6 and CR8 are | Switching diodes CR6 and CR8 are used for selecting the trigger polarity. | ||
used for selecting the trigger polarity. The differential amplifier (i.e., phase splitter) generates | The differential amplifier (i.e., phase splitter) generates both phases, inverted and non-inverted. | ||
both phases, inverted and non-inverted. Depending on the position of the trigger polarity switch, one | Depending on the position of the trigger polarity switch, one or the other of the phases is shunted by 200 Ω resistor. | ||
or the other of the phases is shunted by 200 Ω resistor. The two signals are buffered by common-base | The two signals are buffered by common-base amplifiers Q20 and Q22, whose collector currents are summed. | ||
amplifiers Q20 and Q22, whose collector currents are summed. R25 sets up a bias current on trigger | R25 sets up a bias current on trigger tunnel diode CR25. | ||
tunnel diode CR25. The extra current from Q20 or Q22 pushes CR25 over its peak current, and it switches | The extra current from Q20 or Q22 pushes CR25 over its peak current, and it switches to the high voltage state. | ||
to the high voltage state. | |||
==Pictures== | ==Pictures== | ||