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What is the role of an invert in a CRO?

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What is the role of an invert in a CRO?

(a) inverts the output

(b) inverts the input

(c) attenuates the input

(d) magnifies the input

I had been asked this question during an interview.

This key question is from Front Panel Controls of CRO in division Oscilloscopes of Electrical Measurements

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The correct choice is (b) inverts the input

The explanation: In a Cathode Ray Oscilloscope the invert control section is used for the purpose of inverting the input signal. It basically multiplies the input signal by a factor of -1.

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