Measuring Instruments Question and answers

Measuring Instruments

• What is Voltmeter?

It is an instrument to measure voltage. It is always connected in parallel to the power
supply.

• What is Ammeter?

It is an instrument to measure the current flowing in a circuit. It is always connected
in series with the load.

• What is Megger?

The megohmmeter, commonly called a megger for short, is used to measure very
high resistance values. It is primarily used to test the insulation of conductors. To
measure high resistance values, a high voltage is applied, either by the use of a handcranked
generator or electronic power supply.

• What is Clamp-On Ammeter?

Clamp-on ammeter is used to check the current in a circuit, without being physically
connected in a circuit. They are convenient to use in the field since the circuit does
not have to be opened to take a current reading.

• What is Infrared or Thermal scanner?

Infrared or thermal scanners are used to measure temperature without contact with
the equipment. They produce an image of the component showing temperature
variations, this is effective in spotting worn or loose connections and components in
industrial circuits.

• What is Phase sequence indicator?

Phase sequence indicator used to indicate the 3-phase direction- comes in two styles;
Lights and meters. In the lighted variety, a sequence of light goes on for the phase
sequence being read, while the meter indicates which phase direction it is reading.

• What is Rotation tester?

This device is used during the installation of a motor to determine the direction of the
motor once it is installed. The shaft is mechanically rotated in the desired direction
and the meter indicates if that is the direction in which the motor will rotate.

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