Question
Download Solution PDFThe rectifier instrument is not free from
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct option is 4
Effect of the waveform:
- The rectifier type of instruments is calibrated in terms of r.m.s. values of sinusoidal currents and voltages
- The markings on the instrument are 1.11 and 2.22 times of the average current for full wave and half wave rectification respectively
- These instruments are subject to waveform errors as other waveforms may not have a form factor of 1.11 (in case of full wave rectifier) or 2.22 (in the case of half wave rectifier)
Important Points
Effect of Temperature Change: The resistance of the rectifying element varies with the change in temperature. And this property of the rectifying component causes the error in the instruments.
Frequency Error: As PMMC instrument used in rectifier instruments, frequency error is absent.
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