By J.N. Gurtu, Amit Gurtu.

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It works as an ("eye") for the electronics engineer. With the help of CRO, one can see what is happening in each part of the electronic circuit. A CRO is basically a very fast X-Y plotter. It displays an input signal versus another signal or versus time. The 'stylus' of this plotter is a luminous spot which moves over the display area in response to input voltages. The heart of the oscilloscope is the cathode ray tube (CRT). The rest of the instrument consists of circuitry necessary to operate the CRT.

Value Value indicated in colour code Tolerance Difference between measured value and given values indicated l. 2. 3. 4. 5. Precautions: (i) All the connections should be made tightly. (ii) For accurate result, readings should be taken carefully. (iii) Switch off after taking the readings. EXPERIMENT No. 2 Object : To measure the output voltage of the audio signal generator with the help of CRO. Theory : Both the CRO and the signal generator are important test instruments. The signal generator contains an oscillator and produces sine wave 28 ADVANCED PHYSICAL CHEMISTRY EXPERIMENTS voltage of adjustable frequency and magnitude.

4. This time base provides a sweep voltage of the form shown in fig. (4). It should be noted that without time base voltage, the visual display of applied Sweep voltage or voltage wave-form is impossible. c. c. c. voltage circuit call time base circuits. When such Fig. 5. a voltage is applied to the pair of V-plates t 31 ELECTRONICS of CRO, the spot of light sweeps linearly across the screen in the horizontal direction and suddenly flies back to its starting point for the next sweep. Hence, a horizontal line appears on the screen which is called time base line.

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