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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.



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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