Triggered sweep Oscilloscope history

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triggered sweep controls on tektronix 465 oscilloscope


triggered-sweep oscilloscopes compare vertical deflection signal (or rate of change of signal) adjustable threshold, referred trigger level. well, trigger circuits recognize slope direction of vertical signal when crosses threshold—whether vertical signal positive-going or negative-going @ crossing. called trigger polarity. when vertical signal crosses set trigger level , in desired direction, trigger circuit unblanks crt , starts accurate linear sweep. after completion of horizontal sweep, next sweep occur when signal once again crosses threshold trigger.


variations in triggered-sweep oscilloscopes include models offered crts using long-persistence phosphors, such type p7. these oscilloscopes used applications horizontal trace speed slow, or there long delay between sweeps, provide persistent screen image. oscilloscopes without triggered sweep retro-fitted triggered sweep using solid-state circuit developed harry garland , roger melen in 1971.


as oscilloscopes have become more powerful on time, enhanced triggering options allow capture , display of more complex waveforms. example, trigger holdoff feature in modern oscilloscopes can used define period following trigger during oscilloscope not trigger again. makes easier establish stable view of waveform multiple edges otherwise cause trigger.








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