It is desired to reduce effect of 50Hz pick up in a thermocouple measurement.

It is desired to reduce effect of 50Hz pick up in a
thermocouple measurement. If a third order LP filter is
used for this, what should be its cut off frequency, if
gain should be 0.001 at 50Hz.

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It is desired to reduce effect of 50Hz pick up in a thermocouple measurement. If a third order LP ..

Answer / guest

5Hz.This has a -20dB/decade fall off. the required gain is
0.001 or -60dB.Being third order filter, cut off frequency
should be 50/10 = 5Hz

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