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Module 2: Signal Conditioning Systems

2025?m

Filtering is mainly used to remove:
(i) Useful signals
(ii) High-frequency noise
(iii) DC
(iv) Mechanical vibrations

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Answer

Correct option: (ii) High-frequency noise

Explanation

A filter is a signal-conditioning circuit that allows desired frequency components to pass while attenuating unwanted frequency components.

In DAQ systems, filters are commonly used to remove high-frequency noise, electrical interference and other unwanted components before the signal reaches the ADC.

For example, a low-pass filter allows low-frequency measurement signals to pass while reducing high-frequency noise.

Importance in DAQ

Filtering improves:

  1. Signal quality.
  2. Measurement accuracy.
  3. ADC performance.
  4. Resistance to unwanted interference.
  5. Protection against aliasing when used as an anti-aliasing filter before sampling.

Therefore, the correct answer is (ii).

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