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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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Tip Box

Measuring safety precautions

  • Before started using it, read the manual available with it.
  • Never apply power to the circuit while measuring resistance with a multimeter.
  • Observe the reading properly, when using it.
  • When you are finished using it, switch it OFF.

As incorrect use of measuring instrument may cause injury or damage.


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