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In which method of acquisition, pretrigger event is lost?

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In which method of acquisition, pretrigger event is lost?

(a) Real time sampling

(b) Random repetitive sampling

(c) Sequential repetitive sampling

(d) Analog Sampling

I had been asked this question in semester exam.

The above asked question is from Acquisition Methods topic in chapter Oscilloscopes of Electrical Measurements

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Correct answer is (c) Sequential repetitive sampling

Easiest explanation: In Sequential repetitive sampling, pretrigger information cannot be captured. And the pretrigger view is lost. It can be used only in microwave digital oscilloscope as a result.

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