Lab2-SupplementNotes

Lab2-SupplementNotes - Electrical Measurement Laboratory...

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1 Electrical Measurement Laboratory Laboratory #2 Cathode Ray Oscilloscope
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2 Basic principle Cathode ray tube (conventional TV) Vertical signal / horizontal sweep 1 2 3 4 6 5 7 8 2 3 4 6 5 7 8 1 00 Time (s) Vertical displasment (V) Time (s) Horizontal displacement (V) t o t 1 t 2 t 3 t 2 t 1 t 0 t 3 t 4 t 5 t 6 t 7 t 8 t 4 t 5 t 6 t 7
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3 Vertical signal / horizontal sweep 1 2 3 4 6 5 7 84 00 Time (s) Vertical displasment (V) Time (s) Horizontal displacement (V) t o t 1 t 2 t 3 t 2 t 1 t 0 t 3 t 4 1 2 3 Periodic waveform Over 20 Hz Æ persistent display
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4 Overview of CRO Operation 1. In the usual CRO application, the x-axis (or horizontal input) is an internally generated linear ramp voltage (or time base ), which moves the luminous spot periodically from left to right over the display area (screen). 2. The voltage under examination is applied to the Y-axis (or vertical input) of the CRO, moving the luminous spot up and down in accordance with the instantaneous value of input voltage. 3. The combination of (1) and (2) makes the luminous spot trace a pattern which shows the input voltage variation as a function of time. 4. When the input voltage is repetitive at a fast enough rate (>20Hz), the display appears as a stationary pattern on the screen.
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This note was uploaded on 12/22/2010 for the course ECSE ECSE 291 taught by Professor Khazaka during the Winter '03 term at McGill.

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Lab2-SupplementNotes - Electrical Measurement Laboratory...

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