The time constant of a thermocouple is the time taken to

1.	The time constant of a thermocouple is the time taken to
A.	Minimum time taken to record a temperature reading
B.	Attain 50% of initial temperature difference
C.	Attain the final value to be measured
D.	Attain 63.2% of the value of the initial temperature difference
Answer» E.

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