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Practical Guidelines for Using a CRO Panel: Adjustments for Accurate Measurements

This guide provides practical instructions for effectively using a Cathode Ray Oscilloscope (CRO) panel. Key steps include grounding the CRO, adjusting the trace position, and selecting the appropriate input modes (DC or AC). Users will learn how to adjust sensitivity and timebase settings to ensure observable traces on the screen. Two exercises are included to help reinforce the concepts, focusing on adjusting sensitivity and timebase speed based on the observed waveform. Follow these guidelines for successful CRO measurements.

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Practical Guidelines for Using a CRO Panel: Adjustments for Accurate Measurements

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  1. CRO Practical Guidelines for Using CRO

  2. Panel of the CRO

  3. Preliminary Adjustment • Before making any measurement, ground the CRO. • Turn the “Position” knob so that the trace is at the centre (or at the bottom if required).

  4. Connection • Connect the CRO terminal to the component concerned. • Unearth the Y-input and select DC or AC mode as instructed. • The Earth terminal of the CRO should be connected to the Earth terminal of the circuit. The black terminal is the earth

  5. Adjustment of Sensitivity • Adjust the sensitivity so that the trace does not exceed the CRO screen. This knob should be turned fully clockwise.

  6. Adjustment of Timebase • Adjust the timebase so that one or two complete cycles can be observed on the CRO screen. This knob should be turned fully clockwise.

  7. Exercise 1 The following screen is seen on the CRO. What should we adjust in order to get an observable trace on the screen? A. Decrease the sensitivity B. Increase the sensitivity C. Decrease the speed of timebase D. Increase the speed of timebase

  8. Exercise 1 You are Wrong. Try Again. See Solution.

  9. Congratulations!You are right!

  10. Solution to Exercise 1 In this case, the trace exceed the upper and lower boundary of the screen. So, we should decrease the sensitivity of the Y-input.

  11. Exercise 2 The following screen is seen on the CRO. What should we adjust in order to get an observable trace on the screen? A. Decrease the sensitivity B. Increase the sensitivity C. Decrease the speed of timebase D. Increase the speed of timebase

  12. Exercise 2 You are Wrong. Try Again. See Solution.

  13. Congratulations!You are right!

  14. Solution to Exercise 2 In this case, not even one cycle was observed on the screen. So, the timebase must be too fast and we have to decrease the speed of the time base.

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