Question
Download Solution PDFWhich type of device is used to measure low voltage from the circuit?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFMoving iron voltmeter
- MI instrument is used to measure the RMS values.
- These instruments have a non-uniform scale.
- It works on the principle of attraction of a single piece of soft iron into the magnetic field.
- In the MI instrument, when the current is passed through the solenoid, a magnetic field is set up inside the solenoid. Then the iron piece gets magnetized which in turn deflects the pointer.
- The deflecting torque produced is directly proportional to the square of the current.
- The controlling torque is provided by the spring control.
- The damping torque is provided by air friction damping.
Cathode ray oscilloscope (CRO)
CRO is used for the measurement of voltage, current, frequency, and phase angle of any electrical quantity.
Cathode ray oscilloscopes are suitable for the measurement of very low voltages at high frequencies. CRO is suitable for the measurement of 10 mV at 50 MHz.
Capacitive voltage transformer (CVT)
CVTs are primarily used for voltage measurement, providing voltage signals to metering units, protection relay devices, and automatic control devices.
Instrument transformer
Instrument transformers are high-accuracy electrical devices used to isolate or transform voltage or current levels.
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