Explain the importance of the following instruments – NABTEB QUESTION

(a) Multimeter: A multi meter is an electronic instrument which can measure resistances, currents and voltages. It is an indispensable instrument and can be used for measuring D.C. as well as A.C. voltages and currents. Multi meter is the most inexpensive equipment and can make various electrical
measurements with reasonable accuracy.

(b) Pattern generator: This pattern generator is capable of producing horizontal bars, vertical bars, neutral pattern squares and sound modulation. It is used for;

1. Checking line and frame time base linearity
2. Checking picture height and width
3. Checking video IF
4. Checking and adjustment of sound IF stages
5. Checking AGC section
6. Trouble shooting video amplifier using variable video output
7. Checking audio-amplifier with variable 1000Hz variable output.

(c) Sine wave generator: It furnishes current at a known radio frequency, modulated, and to deliver a measured voltage only at the terminals of the generator without appreciable radiation at any other point.

(d) Cathode ray tube: It facilitates the production of light when electron beam from the gun strikes the screen. The amount of light depend upon the strength of beam current. The beam can be moved to any point on the screen by using the magnetic field produced by a deflection current.

(e) Cathode ray Oscilloscope:

1. Is widely used for the visual observation of electrical wave form
2. Displaying wave forms at high amplitude
3. Finds diversified application in many non-electrical industrial and scientific used where physical effects and phenomena are converted into electrical signals.