Measuring Instruments

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• Use to measure the current, voltage, resistance, impedance, power etc.
• Instruments that indicates the magnitude of quantity by pointing pointer, moving over a graduated scale called as analogue instruments.
• Instruments that indicates the magnitude of quantity in decimal number called as digital instruments.

Typical types of instruments

Digital multimeter:

• It can measure voltage, resistance, current, impedance, capacitance, frequency etc.
• It uses LCD display to show exact reading values.
• Allows you to select the function you want to measure.
• Compact and handy.
• It is simplest and cheapest measuring instrument.
• Some instruments have auto power off function.

Oscilloscope:

• Displays a graph of varying voltage against time.
• Waveform shapes tells you the changes in the signal.
• Signal to be measured is fed through input connector.
• Display panel consists of CRT tube or LCD.
• Modern oscilloscopes are light weight and portable.
• A medical researcher uses an oscilloscope to measure brain waves.

Function generators:

• Use to generate patterns of voltage against variety of amplitudes and frequencies.
• Allows users to choose the shape of patterns like sine, square, triangle etc.
• Generally used in testing and repairing electronic components.

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