A true rms reading voltmeter uses two thermocouples in order

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A true rms reading voltmeter uses two thermocouples in order :(a) to increase sensitivity(b) that the second thermocouple cancels out the non-linear effects of the first thermocouple(c) to prevent drift in the

d.c. amplifier(d) all of the above

Answered by admin @


Voltage in an electrical network can be calculated based on its RMS (Root Mean Square) value. RMS voltmeters are used for measuring the complex waveforms accurately.



A thermocouple is a combination of 2 different metals that are arranged to form a junction in between them. Another thermocouple called as the balancing thermo-couple is also used.



A true RMS reading voltmeter uses two thermocouples in order to “overcome the difficulty that arises due to the non-linear behavior of the thermo-couple”.



The non-linear effects of the balancing thermo-couple cancels the similar non-linearity of the input circuit thermocouple.


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