Question

The excitation frequency of an LVDT is 2 kHz. The maximum frequency of displacement should be limited to

• A. 200 Hz
• B. 1.5 kHz
• C. 2 kHz
• D. 2.5 kHz

Answer 1

The correct option is A 200 Hz

For accurate filtering and demodulation of the signal a frequency ratio of 10 : 1 is followed:

$\therefore$ Maximum frequency of displacement should be limited to
$=\frac{2kHz}{10}=\frac{2000}{10}=200Hz$